LSD settings help

  • Thread starter P0UP0N
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I am curious, did you research influence of wheelbase length or attempt to make a formula that would account for it as a factor beforehand and decide it was a non-factor, or is it assumption in weight that typically lighter cars have short wheelbases and the heavier ones a long wheelbase?

No Budious, I based the formula soley on gross weight for an MR or FR vehicle. If I had an infinite amount of time, it might be fun to search online to find rear curb weights and see if it works as well, if not better.

To be honest, I was so tickled with how well it worked, I didn't feel the need to improve on it more.
 
Very interesting Scottster, definitely have to give this a try. One question though, where did you get the .8 from? Is that constant?

.8 is the difference between the initial torque (40) and the Accel Setting (50), 40 divided by 50.

I have been out of school too long, and couldn't remember the proper ratio...

IF the ratio was 2:1 (Torque 30, Accel 60) then you would would use .5. So, to answer your question, no, its not constant.
 
Low initial torque makes the diff lock faster (wheel will lock after getting more than 5% torque) . High initial torque makes it not lock up until 60% of torque is transmitted through the one wheel.

The initial torque value is not a slip threshold for the LSD to start working. The LSD is always working to some degree. It's simply the amount of lock being applied when the car is neither accelerating or decelerating. It only feels like the LSD is locking harder with a low initial because there is a steeper "ramp up" when you transition onto the throttle or brake. This is why I posted info on how a real LSD works, because you really have to visualize it in your mind's eye to understand what you're adjusting.
 
Hello World

I too am very new to the world of fine tuning and found this thread via searching the site about LSD faqs. After reading it (and links off of it) I would like to see if I'm on the right track (pun intended).

I'm gathering that LSD obviously matters and changes from car to car so there is no set rule here. My example I'm going to use the Honda Dualnote Concept '01. It is a 4wd car that currently has 539 horsepower.

Now, the problem that I'm having is excessive tailspin out of sharp corner/high acceleration situations. If I am trying to adjust the LSD to help compensate for this problem, all other variables aside, I have gathered this much.

1) Front tire grip is currently not a problem in accelleration, so I don't fiddle too much with Initial Torque.

2)Rear wheel grip is fine in the four wheel car, except in situations where I really need to hammer down the accelerator so I am going to set the LSD not to kick in too early, but in situations where the motor is pushing hard. For sake of conversation we will say I am going to set rear initial torque to be a "higher number", for ordinal/testing purposes we will say 35.

3) Again not having much problem with the front wheels, for conversation purposes I set Acceleration Sensitivity to a "lower number"

4) My real problem is the rear end sliding out in a 4wd car. So when the LSD kicks on for accelleration on the rear tires I want it to kick in hard, providing as much grip as I can get out of the tires. For conversation purposes I will say it is set to a "very high" number. Ordinal/testing purposes I will say 60.

Theorycrafting tells me this will cause the LSD to kick in for the rear tires at high RPM situations and provide as much traction to the rear tires as possible, given the abilities of the LSD. Is this correct or did I miss something?

tldr;

Make rear initial torque settings high with a high amount of rear acc sensitivity to have the LSD provide traction to the rear tire in high rev situations?
 
The initial torque value is not a slip threshold for the LSD to start working. The LSD is always working to some degree. It's simply the amount of lock being applied when the car is neither accelerating or decelerating. It only feels like the LSD is locking harder with a low initial because there is a steeper "ramp up" when you transition onto the throttle or brake. This is why I posted info on how a real LSD works, because you really have to visualize it in your mind's eye to understand what you're adjusting.

yeah pretty much just kicks in harder and faster like i said.

if its set higher, it will still be locked but will take longer for the slower tire to reach the speed of the faster tire, while if its set low the slower tire will kick in hard up to the speed of the faster tire.
 
Well I have been reading all over the freakin place and was hoping

https://www.gtplanet.net/forum/showthread.php?t=179606&page=4

or this thread would lead to some conclusive answers. But all I know after waiting for a few days and reading and testing with my own crappy understanding of LSD is I have a 4wd Honda concept with 540 hp that I still can't keep on the road exiting corners or flooring it in a straight line lol...
 
I can't help you exactly, but this thread is somewhat interesting. I guess I just leave things stock and just feather it out of turns. I would like to do some more fine tuning with the LSD though.
 

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