Oversteer under braking? help

[kingstang5oh]

What are the basics of getting rid of oversteer when braking. I put extra camber on the back to fix corner exit oversteer but it did nothing for corner entry.

I did a search but could not find anything helpfull.

I am using a Zonda C12S 7.3 so it is mid engine if that helps at all.

 

[oopssorryy]

My advice would be to soften up the front Spring Rate, so that when your brake you'll get alot of weight transfer to the front of your car, putting more weight on your front tires, which IMHO would solve your problem. That and add some camber to your front tires.

 

[GTP_geoff]

and brake earlier with less force and smoother transfer from braking to accelerating. Smooth smooth smooth like Jenson Button.

 

[Poppins]

are you saying when you are braking into a corner your rear end slides out?

if so raise your braking sensitivity

 

[kingstang5oh]

To be honest the car just has oversteer in general. But i can deal with the middle and exit with throttle control but it really sucks not being able to use your brakes.

WILL SOMEONE PLEASE TUNE THIS CAR

 

[sinharvest24]

Try decreasing the Deceleration Sensitivity in the LSD setup.

 

[BlueShift]

Front comp should be less compared to rear comp.
- If that makes you remove points in front comp, consider removing point in front ext.
- If that makes you add points in rear comp, consider adding some rear ext aswell.

This, or play with LSD's decel, or aero balance... If your weigth distrib is 50/50, you should have aero set at x/x+14, if it's like 40/60, you can have x/x+21 to still be balanced.

Consider front comp/rear ext aswell. You may have rear ext to much high compared to front comp, so all the weigth is put directly at front when you touch the brakes. If you use the zonda LM susp I made, I guess removing 2/2 in the rear will help : this C12S have but no meaning the same rear aero of the LM.

Or remove brake points : making it a low even/even can help, like 1/1, 2/2 or 3/3. Adding front antiroll can help too.

 

[why_spyder]

How about changing the strength of the brake balance.

 

[rubberscrubber2]

As above, I would say lower decel on the diff or lower the rear brake setting.
Or both.

 

[MadMike'86]

Rear Toe-out would be best I imagine

 

[kingstang5oh]

Heres the problem with the street zonda NO downforce tuning you cannot add a wing or anything so what little downforce it has cannot be changed. Just like the tuning nightmare enzo.

 

[Dr Wankel]

My advice would be to soften up the front Spring Rate, so that when your brake you'll get alot of weight transfer to the front of your car, putting more weight on your front tires, which IMHO would solve your problem. That and add some camber to your front tires.

Do not do this, not unless you want even more oversteer.

First thing I would try would be to stiffen the front spring rate slightly or soften the rear a bit. You are basically trying to keep more weight over the rear end so both of these will slow the weight transfer to the front. You can also adjust your brake balance further to the front, I'd probably start with 8/4 or 8/5, see how if feels and make changes from there. I would probably also start by lowering the accel and decel settings of the LSD I generally settle somewhere between 10-15 for high power RWD cars. Also I've noticed with some cars ride height can have a pretty large effect on the overall balance. Typically to solve oversteer you would want to raise the front slightly or lower the rear, doing this will change the static weight balance right off the bat but since tuning in GT5 seems a little backward in this regard. I would try LOWERING the front ride height by about 5 click increments and then work from there. Again these are all different things that can be changed to induce understeer, but I wouldn't go and make wholesale changes all in one shot, I'd try working through them 1 or 2 at a time and make small changes to get it where you want.

 

[why_spyder]

I do believe that brake balance is about the only setting that will affect understeer/oversteer under braking alone. Most other settings will affect the handling even when not braking. IF you don't want to change any other handling characteristics then stick to brake balance.

 

[veyron1001]

My advice would be to soften up the front Spring Rate, so that when your brake you'll get alot of weight transfer to the front of your car, putting more weight on your front tires, which IMHO would solve your problem. That and add some camber to your front tires.

Fail

 

[Motor City Hami]

Brake balance as many have suggested. Are the rears locking?

Also, raise the decel on the LSD. I have run it as high as 40 on cars like this and the Yellow Bird.

 

[oppositelock]

How about changing the strength of the brake balance.

This is the obvious answer. Increase the front and decrease the rear one point at a time until you find the sweet spot.

 

[BlueShift]

This is the obvious answer. Increase the front and decrease the rear one point at a time until you find the sweet spot.

Fail too...

Brake balance is not that easy. If he already have oversteer problems under braking that mean a few things :
- either weight move too fast to front : increase rear brake, soften front susp, increase front comp, decrease rear ext
- either front wheel block the car and the front act like a pivot : increase rear brake and rear ar bars, to stop the rear wanting to kiss the front wall. increase rear comp at the same level of front comp and add the same points to your front ext in answer.
- both : you're in deep something

But : increasing front brakes can be a solution too : that would mean he can't stop the weigth from front. So here he would have to increase front ar and brake points, diminushing rear brake eventually.

That's why I said "change brake balance" not increase front or back.
even/even brakes and big powerslides at low speeds is a easy way to read where the weight is escaping so he can know where to set his brake balance.

Somebody suggested to increase LSD, same reasons. If the weigth escapes from the "not traction wheels" this is a bad idea : "not traction wheel" will counter-act "traction understeer" : energy have to be dissipated in the susp mainly, not by LSD : it's too dangerous for the driving.

C12S, half tuned, that's rigth ? What are the mods ?

 

[kingstang5oh]

Fail too...

Brake balance is not that easy. If he already have oversteer problems under braking that mean a few things :
- either weight move too fast to front : increase rear brake, soften front susp, increase front comp, decrease rear ext
- either front wheel block the car and the front act like a pivot : increase rear brake and rear ar bars, to stop the rear wanting to kiss the front wall. increase rear comp at the same level of front comp and add the same points to your front ext in answer.
- both : you're in deep something

But : increasing front brakes can be a solution too : that would mean he can't stop the weigth from front. So here he would have to increase front ar and brake points, diminushing rear brake eventually.

That's why I said "change brake balance" not increase front or back.
even/even brakes and big powerslides at low speeds is a easy way to read where the weight is escaping so he can know where to set his brake balance.

Somebody suggested to increase LSD, same reasons. If the weigth escapes from the "not traction wheels" this is a bad idea : "not traction wheel" will counter-act "traction understeer" : energy have to be dissipated in the susp mainly, not by LSD : it's too dangerous for the driving.

C12S, half tuned, that's rigth ? What are the mods ?

Fully tuned 928hp not sure the weight as of right now but im going to try some of these and come with some feedback.

It would make it so much easier if someone could do a full tune on this car.

 

[Poppins]

Try decreasing the Deceleration Sensitivity in the LSD setup.

increasing it will make braking more stable and cause the back end not to go out as much. this is what i said already. easy peasy to fix.

 

[Poppins]

Fully tuned 928hp not sure the weight as of right now but im going to try some of these and come with some feedback.

It would make it so much easier if someone could do a full tune on this car.

i will just try and do it right now.

but if you increase the decel sens on your lsd to say 30 or so it will make the wheels stay the same speed more while braking causing you to go straighter, but you are going to get more understeer.

 

[Sail IC]

If dividing the corner into... entry/middle/exit.....or similar .... breaking/coasting/accelerating.

If ONLY having oversteer problem at entry/breaking, I have a hard time to understand how anything but moving the breakbalance forward can cure the problem (assuming you have ABS=1 or higher). If you also have oversteer problem when coasting and/or accelerating, that's a total different issue which needs a different solution.

If you still ONLY having oversteer problem under breaking, you might need to change your driving style and break earlier with this car.

 

[oopssorryy]

Fail

I'm sorry and whats your opinion on what should be done? My solution will fix the understeer while braking, and if you the rear springs are softened up as well, when you hit the accelerator you'll get more weight transfer to the rear tires, giving them more traction, and less understeer . Yes you could play with the brake balance but you'd run the risk of locking up the tires while braking which would produce more understeer under braking. If your getting to much oversteer on corner exit don't add the camber i originally suggested.

 

[Litzner]

More spring in the front, not less, to keep the weight on the rear tires.

Less rear brake.

More brake sensitivity in the LSD.

 

[Motor City Hami]

If dividing the corner into... entry/middle/exit.....or similar .... breaking/coasting/accelerating.

If ONLY having oversteer problem at entry/breaking, I have a hard time to understand how anything but moving the breakbalance forward can cure the problem (assuming you have ABS=1 or higher). If you also have oversteer problem when coasting and/or accelerating, that's a total different issue which needs a different solution.

If you still ONLY having oversteer problem under breaking, you might need to change your driving style and break earlier with this car.

LSD Decel has a huge impact in the braking zones.

 

[Leonidae@MFT]

Also, lowering the rear end helps stabilizing it by a mile.

 

[Dr Wankel]

I'm sorry and whats your opinion on what should be done? My solution will fix the understeer while braking, and if you the rear springs are softened up as well, when you hit the accelerator you'll get more weight transfer to the rear tires, giving them more traction, and less understeer . Yes you could play with the brake balance but you'd run the risk of locking up the tires while braking which would produce more understeer under braking. If your getting to much oversteer on corner exit don't add the camber i originally suggested.

Reread the first post, understeer is not his issue.

 

[sinharvest24]

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