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      09-05-2012, 12:19 AM   #7
OC3
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Drives: 2013 M3 E92 Jerez Blk DCT ZCP
Join Date: Nov 2010
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Quote:
Originally Posted by mrh335 View Post
After a 20 minute first session at the Autobahn CC south course, my off track pressures were 42 psi front and rear with slightly higher pressures on the driver's side.

I bled them down to 40 psi and after the second 20 minute session, they were back up around 41.5 to 42 psi.

I checked the pressures the next morning when things had cooled down in the garage and about 75F out and the pressures read 32/33 in the front and 34.5/33.5 psi in the rear. I started the track session at 34 front and 35 rear (1 psi under the door jam pressures).

I guess next time I will run them even lower when I set them cold
and make sure to keep letting air out.

Any other hints or tricks would be welcome.
Yeah, start at lower psi than 34/35.

On my R-S3, to aim for 38 psi hot (track pressure), I start out at 30 psi cold in the morning (and, monitor & bleed/add throughout the day).
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BRP CW13 1:56 | CVR CW 2:01 | CVR CCW 2:02 | ACS 1:53 | WSIR 1:34
2013 E92 M3 Jerez Black DCT ZCP | JRZ RS Pro | Brembo | Endless | Volk TE37 18x10.5 squared | NT01/TD/ContiGrandAm | no other mods, nor weight shavings