Hey guys, i need some help....

My car is an 2006 mdel and i changed a lot.

the weight of the car is incl driver (me 100kg) full tank 1.300kg

my suspension is an JRZ 1 way adjustable coil over kit

crossweight is 50/50

front and rear CE28N 9*17 Offset 35

tires front and rear 255/40 R17 Michelin Cup Semislicks

1 mounth ago i tried this setup

Front -2.5 camber

Rear -2 camber

Toe @ front 0

toe @ rear total +20 degree

Caster total 7.20

the car was very neutral and @ the limit the car began a little bit to oversteer, but the car was easy to handle.

but 1 week ago i was on track again and tried a new setup.

front -2,5 camber

rear -3.5 camber

Toe @ front 0

toe @ rear +20 degree

caster total 7.70

this time the car understeer a lot, it was horrible..... the car was so slow, in long corners the car understeer so much, that an 350Z overtake me easily...

what was wrong??? my tire pressure was at the beginning of the race 1.9 BAR (27.5 PSI)

after 30 minutes my pressure was round about 2.3 BAR (33,3 PSI)
than i put some air out and did again 1.9 BAR.

tyre temperature was in best condition at the front and rear round about 70 degree (158 F)

so i dont know how all the S2000 can run fast times with that cind of setup.

i want to try in the next time front and rear -3.5 degree camber.

@ this time i think the better setup is to ran @ the front more camber than the rear.

i hope that some proffesionals can help me

 

Do you have a stiffer front sway bar? Try running -2.2 camber up front, and -2.7 camber rear. Dial in a little more toe-in in the rear. 0 toe up front is good. You need to run more pressure in your tires. I'm not sure what those Michelin's like but try 37-40 psi hot.

 

You shouldn't compare yourself to another car but instead look at your shift points or speed at the end of a straight or even better a lap timer.
My guess is that you've increased rear traction with more camber and now the front feels like it's pushing more.
Try to gain more traction in front. Loose some dynamic camber to gain more static camber because that's what's going to help you in fast sweepers.


I'm not a professional so take the info as that.

 

I think it's the 20 degrees of rear toe-in that's slowing you down...

 

You added a lot of rear camber, and you went from some oversteer to now having understeer. Sounds right to me. Dial out the rear camber and you will be back to normal, ish.

 

The idea is to keep increasing traction at each end until you maxed it out and at that point if nothing can be done within reason then remove traction as a last resort.

 

^^^ I agree. Try to maximize front grip before you start to remove it from the rear. If possible try to bring the front camber to 3~3.5 degrees. Try not to change too many things @ once. Also, you could run a bit less toe-in in the rear.

What spring rates are you running? Sway bars?

 

Yeah, that's obviously not what he has. But what does he have?

 

I'm sure he meant .20 which is nothing really.

 

Well said. All too often I hear the exact opposite and it shocks me every time!

Best thing you can do is find the right settings for your car and driving style. This takes lots of work and its a trial and error process. Buy a needle pyrometer and keep a journal of the setting, temps, PSI, and your thoughts. It may take a little while to figure it out but these are the secretes to going fast and you won't get detailed settings form anyone.

If I were you, I'd start at -3