Oenophile

What tire pressures do u run in your S5 ? Look at B pillar then your manual?

bb vign

40F/35R seems to help a little bit with understeer.

DoubleA4

I have mine set at 40psi all around, but think I would agree with bb_vign that decreasing pressure on rears would help with inherent understeer.

Fithian

How about stock Michelin 18s at the track?

uberwgn

Welcome aboard!

Per FMVSS, the B pillar label now displays MAX LOAD conditions only...5 adults weighing 150 lbs each and 5 suit cases.

Crack open your Owner's Manual and you'll find detailed info for your car including normal load conditions. The section I refer to is way at the back of the book.

Enjoy.

JGA5Cab

I agree with this one. The ride will improve greatly and the feeling of needing to correct the steering a lot will decrease.

Hy Octane

Depends on which tires you are using?
I have 19's with Michelin PS3's and run them at 45 front 42 rear cold..

Oenophile

Yep, just thought is was interesting the way it's detailed in the manual because I have always simply looked at the B pillar for my pressures on all vehicles.
I guess instead of saying interesting I should say I was using the wrong setpoints because I never run the car under the "full load" and that is where they WERE set. "WERE" because I will be lowering those pressures tonight...lowering to what setpoint I'm not sure...

From the manual (2012,pg247)
Front "B"-42psi, Normal load - 29psi, Full load - 42psi
Rear "B"-44psi, Normal load - 35psi, Full load - 44psi

Oenophile

P Zero's

Tifosi

Normal load for the front should be 39 psi and not 29 psi.