I am trying to tame a Ferrari F458 GTLM, I thought it’s a waste Forza made it handle so bad from
it’s default setup so I wanted to tune to be a sweet ride. I started at Catalunya and that is pretty
much perfect after +300 laps, but now at Le Mans it remains very unstable under braking and
also under lift-off throttle.
At Le mans it spins entering the chicanes and also at the porsche curves at high speed.
Also it spins out at when I lift off from the throttle.
I tried to adjust brake balance more to the front but this doesn’t help, also differential settings
to 0% (Idon’t like extremes but an more and it’s even more unstable) I tried downforce etc.
But I can’t seem to erase it.
There isn’t a lot of help in the tuning guide about lift-off oversteer and corner-ENTRY oversteer.
I have had this same problem with my S2000. I think softening the rear should help. Try loosening up the rear springs. Damps also. But one thing at a time that way you know what change you made to alleviate the issue. When you said you set diff to 0% make sure it’s decel diff. Last night I had that issue with my Rx7 and I softened springs and damps at it seemed to tone down the corner entry oversteer. Wheel width plays a part as well but try the recommendations above before you go changing the build. Hope this helps. Keep me posted!
I suspect the car is losing rear end traction during braking & cornering because:
Load transfer to front is too fast > need to slow this down
Rear suspension is unable to respond quickly enough (related to #1)
Rear left and right traction not balanced during heavy braking
Front downforce excessively high compared to the rear
I’m going to rule #3 out as major contributor since heavy downforce did not improve the situation. It may, however, be a minor contributor.
My assessment is the load transfer is occurring very fast combined with front end pitching. Soft spring + soft front bump and/or hard rear rebound may be the culprit. As the car slows down, the D/F decreases dramatically, worsening the condition.
Oversteer condition could also exist at LeMans because of high speed. Excessively high front downforce could create this condition as well.
Test/tune the car out with minimal downforce first. Once you have balanced the car WITHOUT downforce, then you can add downforce to balance.
Increases the cars stability under braking. Example, when you brake and the car starts swaying side to side (Or spins out with no steering input), increasing the decel will make the car more stable.
From what I read, the increasing of the decel needs to be the main factor which will help the car.
RR