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AlpWhite04
11-30-2003, 03:11 PM
Hey gang. I have the 18" Pilot Sports on my 330Ci coupe and am running 37.5psi rear and 33.75 front cold. What is the optimum air pressure or am I dialed in correctly :dunno:

Chocaine
11-30-2003, 04:00 PM
It should be listed on the door. Off the top of my head I think its ~40 r and ~29 f. You should be pretty good where you are. When I first got my car they were inflated to 30 all around and when I changed it there was a definite change in handling.

vern
11-30-2003, 04:52 PM
Hey gang. I have the 18" Pilot Sports on my 330Ci coupe and am running 37.5psi rear and 33.75 front cold. What is the optimum air pressure or am I dialed in correctly :dunno:
I have a 01 330ci with SP and 17" Pilot Sports and have been running with 34 front and 38 rear without any problems what so ever,I get a better feel for the steering at higher speeds with those pressures.I would think you would be ok even with the 18 " at those settings.
Good luck
vern

Clarke
12-01-2003, 01:28 AM
It depends on how much you like understeer.You might try more even pressures,personally I run more up front than rear(37/34).With your staggered sizes I'd be even more inclined to do so.Tastes of course vary widely,if you like the turn in and balance now then enjoy!

Pinecone
12-01-2003, 04:41 AM
How does it feel to you?

My tire pressures will not be yours, and vice versa.

I tend to run fairly high tire pressures. And even or more in the front to help dial out understeer.

On the M3 I run from 37 cold all around, to as much as 42 in the front and then tune the rear pressure for the handling I want.

Also if you are asking this question, you can't feel 0.5 or 0.75 psi changes. Go ahead and change the pressure by 2 or 3 psi at a time and see what happens.

In general, up to a fairly high number depending on tire constrution, higher tire presure give more grip, but a harsher ride.