- 4,803
- Dearborn, MI
- MotorCtyHamilton
I have spent more time testing the LSD in Gran Turismo than anyone. It has worked very similarly since GT3. This IS how the LSD works in GT5.
LSD Accel – This setting has one purpose, to manage inside and outside wheel spin. If the inside wheel spins first, raise this setting. If the outside wheel spins first, lower this setting. Most often the tire in need of help will turn red upon throttle application from the corner apex. Sometimes, a car will get loose on you, but neither tire turns red. Puts two or three levels harder tires on the car and mash the throttle in the slow, 2nd gear corners and you should be able to find which tire turns red first. Keep adjusting until both drive tires spin at the same time and this setting will be optimized. On a few cars, you will find a situation where one click higher will make the outside tire turn just a little red and one click lower will make the inside tire a little red. On these rare cars, you cannot fully optimize this setting and will need to choose one.
LSD Decel – This setting has one purpose, to manage stability under braking, turn-in and when coasting. If your car is loose (oversteer) in these situations, raise this setting. If your car has understeer during these conditions, lower this setting. Nearly all of my under 550PP street car tunes have settings between 5 and 7. On pure race cars like LMP cars, JGTC, FGT, F1, 2J, etc., I run much higher decel settings.
LSD Initial Torque – This setting determines how much power is needed to activate the diff – to make it lock. What the means in GT5 is that a higher number produces more understeer and a lower number produces more oversteer. It is that simple. Since the 2.09 update this characteristic is more pronounced and even more noticeable from apex to exit.
The LSD does not add or subtract acceleration. The LSD cannot send more or less power to the drive train. The LSD can only distribute the given amount of power to each of the drive wheels. I see many on this site confuse the LSD with slipper clutches. This must come from R/C off road racing where slipper clutches are popular. In R/C racing a sipper clutch is added as a bolt on to the drive train and will actually slip as power is applied and grip in the higher revs to keep the rear wheels from spinning. There is still an LSD in those gear boxes and they are not set up to slip. They are set up to do the only job of the LSD, to distribute power from side to side under acceleration and braking. If you set them up to slip, they melt. Same goes for real world, if your LSD slips, it melts. Heat is the #1 enemy of an LSD. This is why we have traction control in the real world and in GT5. Traction control limits power through the drive train to the wheels, not the LSD.
In game description:
Initial Torque is the amount of torque necessary to activate the LSD, and prevents sudden changes in performance and handling when the LSD is activated during acceleration or deceleration. The stronger this setting, the less likely unexpected changes in handling and performance are to occur, but the more likely you are to experience understeer.
Sensitivity When Accelerating – Adjust how the LSD will behave when the accelerator is pressed. The higher this setting, the more traction will be retained, but the closer to diff lock you go, the more pronounced understeer will become. It is also possible to increase the sensitivity of an LSD in order to combat oversteer.
Sensitivity When Decelerating – Adjust how the LSD will behave when decelerating. The higher this setting, the more stable the car’s performance when braking, but the more likely the car will be to understeer when cornering.
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The opinions of others are listed below if you are interested in opposing views.
SCAFFS GT4 Guide
Initial Torque Settings:
Opening (lower values) Improves the cars manoeuvrability. Reduces the effect of the accel and decal LSD settings.
Locking (higher values) Increase the effect of the accel and decal LSD settings up to a point, after which the effect will decrease. Reduces the cars manoeuvrability.
* Accel. Settings:
Locking (higher value) Increases traction out of corners by limiting wheel spin. Limits the car’s ability to turn, particularly in tight corners.
Opening (lower value) Reduces traction out of corners by increasing the chances of wheel spin. Improves the car’s ability to turn, particularly in tight corners.
Decel. Settings:
Locking (higher value) Increases stability when decelerating into a corner. Limits the car’s ability to turn.
Opening (lower value) Reduces stability when decelerating into a corner. Improves the car’s ability to turn.
* Note: Scaff’s guide was written for GT4. Changes have been made to the LSD programming and with the addition of tire indicators in GT5, inside and outside wheel spin is now detectable. Scaff’s guide does not address inside and outside wheel spin.
Adrenaline
Initial: Effects the cars stability throughout the entire turning process.
High Initial, usually means more understeer, better forward bite.
Lower Initial, usually means more agility, less acceleration.
*Use the highest Initial Setting possible, without experiencing understeer.
Acceleration: Effects the car under acceleration while exiting a corner and distributes the power between the inside and outside tires.
High Accel, usually means more outside tire spin.
Lower Accel, usually means more inside tire spin.
*Use the highest Accel Setting possible, without experiencing excessive outside wheel spin.
For longer races with tire wear, I recommend using lower numbers to prevent exaggerated wheel spin under low grip conditions experienced when tire life is lower.
Braking: Effects the car while braking, coasting and entering turns.
Higher DeAccel, usually means more understeer on corner entry & coasting through the center.
Lower DeAccel, usually means better agility, but less stability, potential oversteer on entry.
*Use the lowest number possible, where you can safely drive-in as hard as you like, without losing control, or experiencing oversteer.
Chuyler1
Initial: when do you want the LSD to kick in?
Low: Only at full throttle in low gears, Only under hard braking
High: Whenever you touch the throttle, whenever you brake
Accel: Once activated during acceleration, how much power do you want to transfer from the wheel that slips to the wheel that grips?
Low: Very little transfer, good for tracks with tight turns but may cause inside wheelspin when too much throttle is applied
High: Lots of transfer, almost like a welded diff, good for tracks with very few tight turns or cars that have major oversteer issues. Will cause understeer followed by outside wheelspin if too much throttle is applied.
Decel: Once activated during deceleration, how much power do you want to transfer from the wheel that slips to the wheel that grips?
Low: allow both wheels to essentially brake freely. Ovesteer will likely occur if you don't brake in a straight line.
High: forces both wheels to maintain the same rotational speed under braking. Induces understeer under heavy braking which can be safer on fast tracks like LeSarthe.
nomis3613
LSD Initial
- higher = smoother handling, more stability and sometimes more traction
- lower = "edgier" handling, sometimes less traction
LSD Accel
- too little = inside wheel spins, too much = outside wheel spins
- for RWD: outside wheel spinning can reduce understeer, but it can also be harder to control
- for FWD: doesn't seem to be a benefit of spinning outside wheel instead of inside
LSD Decel
- improves stability (or increases understeer) under brakes, by reducing difference in braking force between the left and right wheel
- best use is to reduce lift-off oversteer in MR / RR cars
Terry Bull
initial torque low ,lower acceleration less wheelspin better tyre wear (oversteer)
initial torque High ,fast acceleration ,more wheelspin rapid trye wear (understeer)
accel sensetivity Low ,slower delivery of power ,better control in turns (oversteer)
accel sensetivity High ,greater delivery of power ,causes erratic handling(understeer)
breaking sensetivity Low ,less stability ,ability to turn when breaking(oversteer)
breaking sensetivity High,more stable ,no ability to turn when breaking(understeer)
NMRacing
Initial - If you can feel the LSD engaging in between acceleration and deceleration increase initial torque. If the car understeers to much or is hard to turn, decrease initial torque.
Acceleration sensitivity, increasing the number makes it more sensitive to wheelspin. if the inside wheel spins, increase sensitivity. If the outside wheel spins, decrease sensitivity.
powerdrome
LSD tuning summary:
It is NOT a safety device like TCS; LSD is a tool equipped on special cars, racing, off-road, or gran turismo sportcars to improve performance, to STILL give traction to the wheel that is not spinning (loosing grip).
Initial torque:
In this case torque is NOT referred to engine-->transmission torque (or difference on grip lost)
It IS referred to torque applied by the LSD itself to its gears (clutch plates or oil) when it comes in action, therefore:
IT high = faster LOCK
IT low = slower LOCK (nearest to UNLOCK)
ACCEL SENS HIGH/LOW: stronger/weaker LOCK --> more/less transmission (power) to the NON-slipping tyre
same for DECEL SENS
Tuning LSD we make the power from engine still give traction to the tyre with grip while the other is slipping.
Locking the LSD, its quickness with the IT, its strength (quantity) with ACCel and Decel Sens, WE make the car faster during turns because of more traction, BUT we increase the own grip peculiarities of the car: oversteer on RWD (lsd on rear axle), and understeer on FWD (lsd on front axle); if we cannot handle it, we will experience more slipping.
Low Initial Torque and Med/High ACCEL& DECEL SENS if your driving style is EXTREME (sliding turns)
Low Initial Torque and Low/Med ACCEL& DECEL SENS if your driving style is Expert/Med (safer)
Med/High Initial Torque and Low/Med ACCEL& DECEL SENS for DRIFTING.
Disavowed
Initial torque in the game is simply the amount of wheelspin you'd like to have before the "LSD" effect kicks in. Acceleration simply controls the amount of torque sent to the left or right wheel.
Will27
If the car behaves erraticly, snapping from understeer to oversteer and vice versa at the corner entry and when transitioning from braking to accelerating mid-corner, Increase initial torque.
-If the car is slow to respond to turning, understeers from there and is generally lazy, reduce initial torque(if suspension doesnt help with out resorting to extreme settings)
-If the RWD car understeers on power (not breaking traction), reduce accel. sensitivity, if inside wheel spins uncontrollably, increase till its in check
-If the car lacks drive traction, increase accel. sensitivity, but not to the point where the car will spin under power(RWD)
-If FWD car understeers on power, increase accel. sensitivity. (FWD car will understeer badly if inside tire is allowed to spin)
-If the car understeers under braking or coasting, decrease decel. sensitivity
-If the car oversteers under braking or coasting, increase decel. sensitivity
The_GeneralSo
The initial torque is simply used to trigger the effect. For example, if you accelerate really hard (full throttle) out of a corner and your car is extremely high HP, you would want a HIGH ACCEL LSD SETTING - this is so the car will not oversteer when floored. The initial torque tells sets how quickly the response is - so if you have a high initial torque value, the car will most likely UNDERSTEER - even if you have a low ACCEL LSD setting.
If you set the ACCEL LSD setting to a low setting, you will oversteer very easily. If you set the DECEL LSD setting to a HIGH setting, whenever you BRAKE into a corner, your car will UNDERSTEER. And any light braking could understeer easily. If you set the DECEL LSD setting to a low number, it will easily OVERSTEER AND LOSE CONTROL when you brake into a corner (it can be a soft brake as well if the setting is low).
budious
A higher initial torque is closer to the locked state so it needs less of a transition period to smoothly obtain locked state, a lower initial torque is further from the locked state so it needs more of a transition period to smoothly obtain locked state.
Acceleration sensitivity then would represent transition time between initial torque and locked during which the torque distribution gradually shifts from 10/90 to 50/50. This period needs to be long enough to prevent rapid torque changes which would result in loss of traction exiting corners but short enough to obtain lock shortly after exiting a corner for straight-away stability.
Deceleration sensitivity on the other hand, would represent the transition time from locked back initial torque. This period would not need to be as long as acceleration sensitivity for most configurations since torque is being removed from the wheels simultaneously and unlocking the differential to allow the state of initial torque to be present upon cornering. However, setting this period too short would result in the car becoming prematurely loose during high speed decelerations into corners.
BlueShift
On Rear wheels only
Accel :
Lower values-----------------------------------------------Higher value
<--------------------------------------------------------------------->
Inside tire burns----------Both------------------------Outside tires burns ===> easy way to setup is donuting
Understeer----------------------------------------------------Oversteer
Locks fast---------------------------------------------------Locks slow
**** grip---------------Great grip----------------------------**** grip
--------------------You want to be here-------------------------------
Initial is a maxima aswell
Lower values----------------------------------------------------Higher value
<-------------------------------------------------------------------------->
Spinning wheel get not enough torque----Enough torque-------------Too much torque
Understeer---------------------------------------------------------Oversteer
Fast to unlock-------------------------------------------------Slow to unlock ===> this governs coasting steering.
**** grip---------------------------------Great grip----------------**** grip
smoothness-----------------------------appropriate-------------------violence
-----------------------------------You want to be here-----------------------
Each car have her "perfect grip" LSD, and each one is different.
Poppins
IT is how easy it is to lock. Higher # is easier Lower # is harder.
AS/DS is how much it does lock. IT. Adjusts how responsive the LSD is, as it is always active while cornering but can also limit slip somewhat at all times. Increasing results in more understeer but a more responsive LSD. lower IT makes it respond later but makes the response smoother, has nothing to do with how much torque is transferred or how much lock there is. it is how much preload is already in the lsd to allow it to lock, which is what the accel sens controls. the more preload the faster response, but the more it is locked when it isnt needed to be.
AS. Adjusts the sensitivity while accelerating. If you get inside tire spin exiting a corner then you are should raise this, as it affects how much lock there is and the closer to lock you go the more traction will be retained. Going too high also causes understeer. lower AS makes it not lock up as much and gives you inside wheel spin if its too low. higher is almost always better.
No_OBsT33R
Int will affect both accel and deccel increasing the setting tunes out oversteer, decreasing it tunes out understeer. A lower setting allows for a more free turning vehicle, a higher setting is more stable but the LSD resist turning.
Accel when the LSD is slipping and you hit the gas, increasing the setting sends more power to the inside wheel, and decreasing the setting keeps more of the inside wheels power on the inside. Increase to tune out throttle oversteer, decrease to tune out throttle understeer.
Decel when the LSD is slipping and you hit the brakes increasing the setting will tune out braking instability (loose while braking), making the car harder to turn / change directions while braking, decreasing the setting will tune out resistance to rotating while braking, making the car easier to turn/change directions while braking.
praiano63
Initial torque settings : this is the master setting of the differential
• Higher the value is, less it will allowthe difference of speed between the internal and external wheels.
Good point : The oversteer will be reduced and the torque will be oriented and transmitted to the “good wheel” .
Bad point : The car will have some difficulties to enter in a corner, more understeer.
• Lower the value is, more it will allow the difference of speed between the internal and external wheels.
Good point : The car will be easy to turn and more responsive for example in a succession of curves
Bad point : Beware with retake acceleration and strong braking .The car will be more sensible and more dificult to control !
Acceleration setting : This is a secondary setting who define the differential setting during acceleration only.
• Higher this value is ,less it will allow difference of speed between the wheels during acceleration,avoiding eventuals spinnings. But it will increase understeer.
• Lower this value is, more the car will be able to turn, but an generate oversteer and loose the rear if accelerating to much.
Deceleration settings : This setting will define how the differential will work when braking.
• Higher is the value, more the car will be steady on his line when you brake. But you’ll have more difficulties to enter the curve and sometime you ‘ll have to fight with the car to reach the apex.
• Lower is this value ,more the car will be unstable from the rear when braking and will have a tendency to spin. But also it’ll be more easy to enter I the curves and turn.
Jackthalad
Initial Torque
The higher this setting is, the more easily the LSD will lock and the more responsive acceleration will be. The lower it is, the more slowly the LSD will take affect. Increasing the Initial Torque will accentuate the handling peculiarities of a vehicle's drivetrain layout. Therefore, oversteer will be increased in RWD cars and understeer will be increased in FWD cars. Although this improves traction in both cases, it will make turning more difficult. As such, initial torque adjustments should be made with the desired handling requirements in mind.
Acceleration Sensitivity
The acceleration setting governs the effectiveness of the LSD when stepping on the accelerator and the stronger it is, the more drive power is transmitted to the wheels and the more quickly the car will be able to clear corners. However, this will also accenuate any handling peculiararities, and getting the car to point in the direction needed to exit the corner may require some skill.
Deceleration Sensitivity
The deceleration setting governs the effectiveness of the LSD when the accelerator is released. The stronger it is, the more stable it will be upon entry into a corner while braking. This allows you to go into the turn very fast, because you can keep braking longer than you would otherwise. However, this makes turning more difficult and is only recommended for advanced drivers who are skilled at compensating for initial understeer.
CSLACR
LSD Initial: How quickly the LSD activates once it senses wheel spin, meaning a low setting allows lots of wheel spin before "turning on", and a high setting "turns on" almost immediately.
Accel: Affects on-throttle driving. When you're on the throttle, this determines how much faster either wheel is "allowed" to spin more then the other. A low setting will allow you to bake the inside tire exiting corners, a high setting will bake the outside tire.
Decel: Same as accel, but only works when completely off the throttle. The greatest effect of LSD decel is seen when downshifting hard entering a corner on the brakes, though it affects the car whether on the brakes or not.
Lambob
I got a new analogy:
IT: range from 5 to 60.
The higher this number, the more stable your car will be as you go from the sudden transitions from stomping your brakes, to slamming the pedal to the plastic. I say stable, because maybe your car handles just fine without limiting the rotational differences, so you may as well set this a higher value, if you are confident with your throttle and brake control on the track that you know all so well. a higher value will still act on ACC and DEC (below) just kickin later than sooner.
ACC: range from 5 to 60.
Think of it this way, you are iceskating. if you set this at lower numberical values, think of it as a beast pushing you hard from behind. You will go forth all crazy like, perhaps overskating at flying to either side, but it's fun isn't it?
If you set this higher number, think of that same beast, pulling you hard and fast by the hands and arms, you will fly straighter, at the cost of turning ability as described in the manual.
Decel, a low number, that beast slowing you down but he is standing in front of you, pushing your nose down, so your body will sway side to side as you slow. perhaps that is what you want! (Cough, Nurburgring, cough)
Decel, a high value number, that beast will slow you down as if opening a huge parachute from behind you to slow you down nice and easy, but more in a straight line.(cough, LaSarthe, wheeze excuse me)
Think of all three values, there is no perfect setting, and unfortunately act different from most cars and their suspension setups.
MrGrado
I think 35/50/35 is great for many cars with racing slicks. It's also great for most tunes that don't have the suspension really dialed in good.
The following advice really applies to FR and MR tunes:
If you trail brake to the apex and the car is oversteering (usually tight corners), lowering decel value to 10 - 15 might help. A high value might not allow the rear wheels to rotate at different rates sufficiently.
Some people have used very high decel settings for some difficult cars like Shelby Cobra.
There is very little disadvantage to having high accel settings (28 - 40). You may need to apply part throttle coming out of tight corners but you will have a very solid and precise car for all mid and high speed sections of the circuit. If you start to spin wheels in a tight corner just reduce acceleration for a moment, even come completely off the throttle for a moment.
I find that having a very low accel setting (5 - 12) can be a terrible thing for low speed corners. If you spin the inside rear tyre you can spin the car from the reduced overall grip at the rear of the car. At best the car is understeery, mushy and slow. If the tuner has tuned this out with small increments the car can end up being unpredictable and uncontrollable. Lets say the understeer is gone at accel 20, I prefer accel at least 20% higher (24+).
High initial values can be good for someone that drives aggressively. Increasing initial can cure a car that seems to oversteer for no reason under acceleration well after the apex of a bend. Lowering accel might help a car turn a little tighter when coasting.
I recommend making large adjustments to differential settings to see the changes they make. Except for making incremental adjustments to accel to reduce understeer, like I mentioned earlier, small adjustment can be very difficult to detect.
Lastly, for very low power cars and to some extent cars with low grip tyres, a far more open differential might be better (so low setting values).
LSD Accel – This setting has one purpose, to manage inside and outside wheel spin. If the inside wheel spins first, raise this setting. If the outside wheel spins first, lower this setting. Most often the tire in need of help will turn red upon throttle application from the corner apex. Sometimes, a car will get loose on you, but neither tire turns red. Puts two or three levels harder tires on the car and mash the throttle in the slow, 2nd gear corners and you should be able to find which tire turns red first. Keep adjusting until both drive tires spin at the same time and this setting will be optimized. On a few cars, you will find a situation where one click higher will make the outside tire turn just a little red and one click lower will make the inside tire a little red. On these rare cars, you cannot fully optimize this setting and will need to choose one.
LSD Decel – This setting has one purpose, to manage stability under braking, turn-in and when coasting. If your car is loose (oversteer) in these situations, raise this setting. If your car has understeer during these conditions, lower this setting. Nearly all of my under 550PP street car tunes have settings between 5 and 7. On pure race cars like LMP cars, JGTC, FGT, F1, 2J, etc., I run much higher decel settings.
LSD Initial Torque – This setting determines how much power is needed to activate the diff – to make it lock. What the means in GT5 is that a higher number produces more understeer and a lower number produces more oversteer. It is that simple. Since the 2.09 update this characteristic is more pronounced and even more noticeable from apex to exit.
The LSD does not add or subtract acceleration. The LSD cannot send more or less power to the drive train. The LSD can only distribute the given amount of power to each of the drive wheels. I see many on this site confuse the LSD with slipper clutches. This must come from R/C off road racing where slipper clutches are popular. In R/C racing a sipper clutch is added as a bolt on to the drive train and will actually slip as power is applied and grip in the higher revs to keep the rear wheels from spinning. There is still an LSD in those gear boxes and they are not set up to slip. They are set up to do the only job of the LSD, to distribute power from side to side under acceleration and braking. If you set them up to slip, they melt. Same goes for real world, if your LSD slips, it melts. Heat is the #1 enemy of an LSD. This is why we have traction control in the real world and in GT5. Traction control limits power through the drive train to the wheels, not the LSD.
In game description:
Initial Torque is the amount of torque necessary to activate the LSD, and prevents sudden changes in performance and handling when the LSD is activated during acceleration or deceleration. The stronger this setting, the less likely unexpected changes in handling and performance are to occur, but the more likely you are to experience understeer.
Sensitivity When Accelerating – Adjust how the LSD will behave when the accelerator is pressed. The higher this setting, the more traction will be retained, but the closer to diff lock you go, the more pronounced understeer will become. It is also possible to increase the sensitivity of an LSD in order to combat oversteer.
Sensitivity When Decelerating – Adjust how the LSD will behave when decelerating. The higher this setting, the more stable the car’s performance when braking, but the more likely the car will be to understeer when cornering.
---------------------------------------------------------------------------------
The opinions of others are listed below if you are interested in opposing views.
SCAFFS GT4 Guide
Initial Torque Settings:
Opening (lower values) Improves the cars manoeuvrability. Reduces the effect of the accel and decal LSD settings.
Locking (higher values) Increase the effect of the accel and decal LSD settings up to a point, after which the effect will decrease. Reduces the cars manoeuvrability.
* Accel. Settings:
Locking (higher value) Increases traction out of corners by limiting wheel spin. Limits the car’s ability to turn, particularly in tight corners.
Opening (lower value) Reduces traction out of corners by increasing the chances of wheel spin. Improves the car’s ability to turn, particularly in tight corners.
Decel. Settings:
Locking (higher value) Increases stability when decelerating into a corner. Limits the car’s ability to turn.
Opening (lower value) Reduces stability when decelerating into a corner. Improves the car’s ability to turn.
* Note: Scaff’s guide was written for GT4. Changes have been made to the LSD programming and with the addition of tire indicators in GT5, inside and outside wheel spin is now detectable. Scaff’s guide does not address inside and outside wheel spin.
Adrenaline
Initial: Effects the cars stability throughout the entire turning process.
High Initial, usually means more understeer, better forward bite.
Lower Initial, usually means more agility, less acceleration.
*Use the highest Initial Setting possible, without experiencing understeer.
Acceleration: Effects the car under acceleration while exiting a corner and distributes the power between the inside and outside tires.
High Accel, usually means more outside tire spin.
Lower Accel, usually means more inside tire spin.
*Use the highest Accel Setting possible, without experiencing excessive outside wheel spin.
For longer races with tire wear, I recommend using lower numbers to prevent exaggerated wheel spin under low grip conditions experienced when tire life is lower.
Braking: Effects the car while braking, coasting and entering turns.
Higher DeAccel, usually means more understeer on corner entry & coasting through the center.
Lower DeAccel, usually means better agility, but less stability, potential oversteer on entry.
*Use the lowest number possible, where you can safely drive-in as hard as you like, without losing control, or experiencing oversteer.
Chuyler1
Initial: when do you want the LSD to kick in?
Low: Only at full throttle in low gears, Only under hard braking
High: Whenever you touch the throttle, whenever you brake
Accel: Once activated during acceleration, how much power do you want to transfer from the wheel that slips to the wheel that grips?
Low: Very little transfer, good for tracks with tight turns but may cause inside wheelspin when too much throttle is applied
High: Lots of transfer, almost like a welded diff, good for tracks with very few tight turns or cars that have major oversteer issues. Will cause understeer followed by outside wheelspin if too much throttle is applied.
Decel: Once activated during deceleration, how much power do you want to transfer from the wheel that slips to the wheel that grips?
Low: allow both wheels to essentially brake freely. Ovesteer will likely occur if you don't brake in a straight line.
High: forces both wheels to maintain the same rotational speed under braking. Induces understeer under heavy braking which can be safer on fast tracks like LeSarthe.
nomis3613
LSD Initial
- higher = smoother handling, more stability and sometimes more traction
- lower = "edgier" handling, sometimes less traction
LSD Accel
- too little = inside wheel spins, too much = outside wheel spins
- for RWD: outside wheel spinning can reduce understeer, but it can also be harder to control
- for FWD: doesn't seem to be a benefit of spinning outside wheel instead of inside
LSD Decel
- improves stability (or increases understeer) under brakes, by reducing difference in braking force between the left and right wheel
- best use is to reduce lift-off oversteer in MR / RR cars
Terry Bull
initial torque low ,lower acceleration less wheelspin better tyre wear (oversteer)
initial torque High ,fast acceleration ,more wheelspin rapid trye wear (understeer)
accel sensetivity Low ,slower delivery of power ,better control in turns (oversteer)
accel sensetivity High ,greater delivery of power ,causes erratic handling(understeer)
breaking sensetivity Low ,less stability ,ability to turn when breaking(oversteer)
breaking sensetivity High,more stable ,no ability to turn when breaking(understeer)
NMRacing
Initial - If you can feel the LSD engaging in between acceleration and deceleration increase initial torque. If the car understeers to much or is hard to turn, decrease initial torque.
Acceleration sensitivity, increasing the number makes it more sensitive to wheelspin. if the inside wheel spins, increase sensitivity. If the outside wheel spins, decrease sensitivity.
powerdrome
LSD tuning summary:
It is NOT a safety device like TCS; LSD is a tool equipped on special cars, racing, off-road, or gran turismo sportcars to improve performance, to STILL give traction to the wheel that is not spinning (loosing grip).
Initial torque:
In this case torque is NOT referred to engine-->transmission torque (or difference on grip lost)
It IS referred to torque applied by the LSD itself to its gears (clutch plates or oil) when it comes in action, therefore:
IT high = faster LOCK
IT low = slower LOCK (nearest to UNLOCK)
ACCEL SENS HIGH/LOW: stronger/weaker LOCK --> more/less transmission (power) to the NON-slipping tyre
same for DECEL SENS
Tuning LSD we make the power from engine still give traction to the tyre with grip while the other is slipping.
Locking the LSD, its quickness with the IT, its strength (quantity) with ACCel and Decel Sens, WE make the car faster during turns because of more traction, BUT we increase the own grip peculiarities of the car: oversteer on RWD (lsd on rear axle), and understeer on FWD (lsd on front axle); if we cannot handle it, we will experience more slipping.
Low Initial Torque and Med/High ACCEL& DECEL SENS if your driving style is EXTREME (sliding turns)
Low Initial Torque and Low/Med ACCEL& DECEL SENS if your driving style is Expert/Med (safer)
Med/High Initial Torque and Low/Med ACCEL& DECEL SENS for DRIFTING.
Disavowed
Initial torque in the game is simply the amount of wheelspin you'd like to have before the "LSD" effect kicks in. Acceleration simply controls the amount of torque sent to the left or right wheel.
Will27
If the car behaves erraticly, snapping from understeer to oversteer and vice versa at the corner entry and when transitioning from braking to accelerating mid-corner, Increase initial torque.
-If the car is slow to respond to turning, understeers from there and is generally lazy, reduce initial torque(if suspension doesnt help with out resorting to extreme settings)
-If the RWD car understeers on power (not breaking traction), reduce accel. sensitivity, if inside wheel spins uncontrollably, increase till its in check
-If the car lacks drive traction, increase accel. sensitivity, but not to the point where the car will spin under power(RWD)
-If FWD car understeers on power, increase accel. sensitivity. (FWD car will understeer badly if inside tire is allowed to spin)
-If the car understeers under braking or coasting, decrease decel. sensitivity
-If the car oversteers under braking or coasting, increase decel. sensitivity
The_GeneralSo
The initial torque is simply used to trigger the effect. For example, if you accelerate really hard (full throttle) out of a corner and your car is extremely high HP, you would want a HIGH ACCEL LSD SETTING - this is so the car will not oversteer when floored. The initial torque tells sets how quickly the response is - so if you have a high initial torque value, the car will most likely UNDERSTEER - even if you have a low ACCEL LSD setting.
If you set the ACCEL LSD setting to a low setting, you will oversteer very easily. If you set the DECEL LSD setting to a HIGH setting, whenever you BRAKE into a corner, your car will UNDERSTEER. And any light braking could understeer easily. If you set the DECEL LSD setting to a low number, it will easily OVERSTEER AND LOSE CONTROL when you brake into a corner (it can be a soft brake as well if the setting is low).
budious
A higher initial torque is closer to the locked state so it needs less of a transition period to smoothly obtain locked state, a lower initial torque is further from the locked state so it needs more of a transition period to smoothly obtain locked state.
Acceleration sensitivity then would represent transition time between initial torque and locked during which the torque distribution gradually shifts from 10/90 to 50/50. This period needs to be long enough to prevent rapid torque changes which would result in loss of traction exiting corners but short enough to obtain lock shortly after exiting a corner for straight-away stability.
Deceleration sensitivity on the other hand, would represent the transition time from locked back initial torque. This period would not need to be as long as acceleration sensitivity for most configurations since torque is being removed from the wheels simultaneously and unlocking the differential to allow the state of initial torque to be present upon cornering. However, setting this period too short would result in the car becoming prematurely loose during high speed decelerations into corners.
BlueShift
On Rear wheels only
Accel :
Lower values-----------------------------------------------Higher value
<--------------------------------------------------------------------->
Inside tire burns----------Both------------------------Outside tires burns ===> easy way to setup is donuting
Understeer----------------------------------------------------Oversteer
Locks fast---------------------------------------------------Locks slow
**** grip---------------Great grip----------------------------**** grip
--------------------You want to be here-------------------------------
Initial is a maxima aswell
Lower values----------------------------------------------------Higher value
<-------------------------------------------------------------------------->
Spinning wheel get not enough torque----Enough torque-------------Too much torque
Understeer---------------------------------------------------------Oversteer
Fast to unlock-------------------------------------------------Slow to unlock ===> this governs coasting steering.
**** grip---------------------------------Great grip----------------**** grip
smoothness-----------------------------appropriate-------------------violence
-----------------------------------You want to be here-----------------------
Each car have her "perfect grip" LSD, and each one is different.
Poppins
IT is how easy it is to lock. Higher # is easier Lower # is harder.
AS/DS is how much it does lock. IT. Adjusts how responsive the LSD is, as it is always active while cornering but can also limit slip somewhat at all times. Increasing results in more understeer but a more responsive LSD. lower IT makes it respond later but makes the response smoother, has nothing to do with how much torque is transferred or how much lock there is. it is how much preload is already in the lsd to allow it to lock, which is what the accel sens controls. the more preload the faster response, but the more it is locked when it isnt needed to be.
AS. Adjusts the sensitivity while accelerating. If you get inside tire spin exiting a corner then you are should raise this, as it affects how much lock there is and the closer to lock you go the more traction will be retained. Going too high also causes understeer. lower AS makes it not lock up as much and gives you inside wheel spin if its too low. higher is almost always better.
No_OBsT33R
Int will affect both accel and deccel increasing the setting tunes out oversteer, decreasing it tunes out understeer. A lower setting allows for a more free turning vehicle, a higher setting is more stable but the LSD resist turning.
Accel when the LSD is slipping and you hit the gas, increasing the setting sends more power to the inside wheel, and decreasing the setting keeps more of the inside wheels power on the inside. Increase to tune out throttle oversteer, decrease to tune out throttle understeer.
Decel when the LSD is slipping and you hit the brakes increasing the setting will tune out braking instability (loose while braking), making the car harder to turn / change directions while braking, decreasing the setting will tune out resistance to rotating while braking, making the car easier to turn/change directions while braking.
praiano63
Initial torque settings : this is the master setting of the differential
• Higher the value is, less it will allowthe difference of speed between the internal and external wheels.
Good point : The oversteer will be reduced and the torque will be oriented and transmitted to the “good wheel” .
Bad point : The car will have some difficulties to enter in a corner, more understeer.
• Lower the value is, more it will allow the difference of speed between the internal and external wheels.
Good point : The car will be easy to turn and more responsive for example in a succession of curves
Bad point : Beware with retake acceleration and strong braking .The car will be more sensible and more dificult to control !
Acceleration setting : This is a secondary setting who define the differential setting during acceleration only.
• Higher this value is ,less it will allow difference of speed between the wheels during acceleration,avoiding eventuals spinnings. But it will increase understeer.
• Lower this value is, more the car will be able to turn, but an generate oversteer and loose the rear if accelerating to much.
Deceleration settings : This setting will define how the differential will work when braking.
• Higher is the value, more the car will be steady on his line when you brake. But you’ll have more difficulties to enter the curve and sometime you ‘ll have to fight with the car to reach the apex.
• Lower is this value ,more the car will be unstable from the rear when braking and will have a tendency to spin. But also it’ll be more easy to enter I the curves and turn.
Jackthalad
Initial Torque
The higher this setting is, the more easily the LSD will lock and the more responsive acceleration will be. The lower it is, the more slowly the LSD will take affect. Increasing the Initial Torque will accentuate the handling peculiarities of a vehicle's drivetrain layout. Therefore, oversteer will be increased in RWD cars and understeer will be increased in FWD cars. Although this improves traction in both cases, it will make turning more difficult. As such, initial torque adjustments should be made with the desired handling requirements in mind.
Acceleration Sensitivity
The acceleration setting governs the effectiveness of the LSD when stepping on the accelerator and the stronger it is, the more drive power is transmitted to the wheels and the more quickly the car will be able to clear corners. However, this will also accenuate any handling peculiararities, and getting the car to point in the direction needed to exit the corner may require some skill.
Deceleration Sensitivity
The deceleration setting governs the effectiveness of the LSD when the accelerator is released. The stronger it is, the more stable it will be upon entry into a corner while braking. This allows you to go into the turn very fast, because you can keep braking longer than you would otherwise. However, this makes turning more difficult and is only recommended for advanced drivers who are skilled at compensating for initial understeer.
CSLACR
LSD Initial: How quickly the LSD activates once it senses wheel spin, meaning a low setting allows lots of wheel spin before "turning on", and a high setting "turns on" almost immediately.
Accel: Affects on-throttle driving. When you're on the throttle, this determines how much faster either wheel is "allowed" to spin more then the other. A low setting will allow you to bake the inside tire exiting corners, a high setting will bake the outside tire.
Decel: Same as accel, but only works when completely off the throttle. The greatest effect of LSD decel is seen when downshifting hard entering a corner on the brakes, though it affects the car whether on the brakes or not.
Lambob
I got a new analogy:
IT: range from 5 to 60.
The higher this number, the more stable your car will be as you go from the sudden transitions from stomping your brakes, to slamming the pedal to the plastic. I say stable, because maybe your car handles just fine without limiting the rotational differences, so you may as well set this a higher value, if you are confident with your throttle and brake control on the track that you know all so well. a higher value will still act on ACC and DEC (below) just kickin later than sooner.
ACC: range from 5 to 60.
Think of it this way, you are iceskating. if you set this at lower numberical values, think of it as a beast pushing you hard from behind. You will go forth all crazy like, perhaps overskating at flying to either side, but it's fun isn't it?
If you set this higher number, think of that same beast, pulling you hard and fast by the hands and arms, you will fly straighter, at the cost of turning ability as described in the manual.
Decel, a low number, that beast slowing you down but he is standing in front of you, pushing your nose down, so your body will sway side to side as you slow. perhaps that is what you want! (Cough, Nurburgring, cough)
Decel, a high value number, that beast will slow you down as if opening a huge parachute from behind you to slow you down nice and easy, but more in a straight line.(cough, LaSarthe, wheeze excuse me)
Think of all three values, there is no perfect setting, and unfortunately act different from most cars and their suspension setups.
MrGrado
I think 35/50/35 is great for many cars with racing slicks. It's also great for most tunes that don't have the suspension really dialed in good.
The following advice really applies to FR and MR tunes:
If you trail brake to the apex and the car is oversteering (usually tight corners), lowering decel value to 10 - 15 might help. A high value might not allow the rear wheels to rotate at different rates sufficiently.
Some people have used very high decel settings for some difficult cars like Shelby Cobra.
There is very little disadvantage to having high accel settings (28 - 40). You may need to apply part throttle coming out of tight corners but you will have a very solid and precise car for all mid and high speed sections of the circuit. If you start to spin wheels in a tight corner just reduce acceleration for a moment, even come completely off the throttle for a moment.
I find that having a very low accel setting (5 - 12) can be a terrible thing for low speed corners. If you spin the inside rear tyre you can spin the car from the reduced overall grip at the rear of the car. At best the car is understeery, mushy and slow. If the tuner has tuned this out with small increments the car can end up being unpredictable and uncontrollable. Lets say the understeer is gone at accel 20, I prefer accel at least 20% higher (24+).
High initial values can be good for someone that drives aggressively. Increasing initial can cure a car that seems to oversteer for no reason under acceleration well after the apex of a bend. Lowering accel might help a car turn a little tighter when coasting.
I recommend making large adjustments to differential settings to see the changes they make. Except for making incremental adjustments to accel to reduce understeer, like I mentioned earlier, small adjustment can be very difficult to detect.
Lastly, for very low power cars and to some extent cars with low grip tyres, a far more open differential might be better (so low setting values).
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Thanks MCH.
