bmw m3 questions

[tradethedead]

hey guys. i am trying to build a bmw m3 coupe, for lap battle, and i cant seem to get the rear end to stay planted. as soon as i step on the gas, coming out of the apex, the tires spin like crazy and i loose too much grip.


anything you guys suggest?

 

[mattythedog]

Be more gentle on the thottle.

 

[tradethedead]

Be more gentle on the thottle.

that is literally is no help to me. i am pushing for lap times. i want tuning help.

 

[mattythedog]

that is literally is no help to me. i am pushing for lap times. i want tuning help.

If you mash the throttle down in any car then the wheels will spin. Watch racing drivers, they depress the pedal very carefully.

 

[tradethedead]

If you mash the throttle down in any car then the wheels will spin. Watch racing drivers, they depress the pedal very carefully.

you still arent helping.....

 

[mattythedog]

you still arent helping.....

Well you asked for advice to stop wheelspin. I am giving you advice. Take it or leave it.

 

[avgtuner]

More positive toe will stabilize the end you add it to. More negative toe will loosen it up.I can give you a transmission tune that will take a few seconds off your best lap time too if you want it.

 

[BobbyBRAKEaNek]

You could also soften the rear springs or stabilizers.

 

[tradethedead]

More positive toe will stabilize the end you add it to. More negative toe will loosen it up.I can give you a transmission tune that will take a few seconds off your best lap time too if you want it.

thank you. thats the kind of information i was looking for. i have -4.5 degree camber front -3.5 rear. and my rear toe is +0.15, front is +0.00

springs are 12k all the way around.

dampeners(enxtend) 2
dampeners(contract) 2
roll bars 4

both sides mirror eachother.

 

[paraclete]

I've had good luck by lowering the rear a couple more mm than the front. That plus careful throttle control = pretty easy to control (even with all assists off)

 

[bigberry]

If the above isnt working you can adjust the LSD, id start with an accel figure of 35 or 40 and tweak from there.

 

[Mudd]

I think your high camber settings could also be taking away forward grip. Try lowering the rear camber to around 1.5, see what that does.

 

[GTP_FastM3]

I think you might have too much camber as well. I find 2.2 front and 1.6 rear works well.

 

[Leonidae@MFT]

Indeed. Way too much camber even if you run racing softs which you aren't, judging from the problems. Also, I'd adjust the transmission to match the increased power.

 

[oppositelock]

dampeners(enxtend) 2
dampeners(contract) 2

Way too soft. That thing is probably bobbing around like a 1976 Oldsmobile with blown shocks, no wonder it's not stable. Try between 6 and 8. And like the others have said, way too much camber and not enough rear toe in.

 

[JackWilson]

Set the rear ride height 10mm higher, works a charm.