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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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Old 06-17-2013, 07:33 PM
isjoey isjoey is offline
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Location: Ashburn, VA
 
Join Date: Mar 2012
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Mein Auto: 2011 335is
PS2 ZP - track day tire pressure?

Hello, I am looking for a little feedback in regards to a good all around tire pressure for track days with the PS2 ZPs. I have done a couple HPDE days with the pressure of 37 front / 44 rear - cold. Someone had mentioned the higher pressure recommendation is just too high for the track, which I would agree with. My top speed is approx. 120-130 and not for very long. Any feedback would be great!
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2011 335is
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Old 06-18-2013, 05:08 AM
mr_bean mr_bean is offline
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Location: NJ
 
Join Date: Mar 2009
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Mein Auto: 2000 328i
37/44 seems too high. The best way to determine the right tire pressures is to get a hold of a pyrometer and measure the temperture profile of the tire tread immediately after a few hot laps around the track. If the center of the tread is running hot, then the pressure is too high. If the shoulders of the tread are running hot, then the pressure is too low. Keep on mind that the outside shoulder will usually be hotter than the inside because of cornering loads.
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