track tire pressure

totoro · 03-01-2008, 09:03 PM

I just got a set of Michelin PS2's for my 335i coupe & was wondering what's the best tire pressure for these on track?

Front 18" - 225/40
Rear 18" - 255/35

Door panel says to keep these pressures for the tires:
Front 32 PSI
Rear 35 PSI

The other door label says to keep these pressures if going over 100mph:
Front 38 PSI
Rear 42 PSI

Also, someone said if the tires make a screeching sound a lot on track, then that means they're under-inflated. Is that correct or is it if they're over-inflated, they screech? I forget.

The PS2's stick like glue on track. oh yah, I like!

Thanks

shimshimhada · 03-02-2008, 12:57 AM

I start with 38PSI all around initially, then adjust throughout the day.

S4to335 · 03-02-2008, 02:01 AM

When my r compounds died...I put back on my Goodyear F1-D3s...and set them at 38 PSI cold...they worked ok..I just didnt want to wear off the outside edges...not worth it.

totoro · 03-02-2008, 03:24 AM

All around with the same PSI, even though it's staggered? I did not know that.
ok, I'll do that next time.

thanks y'all

S4to335 · 03-02-2008, 09:37 AM

Normally...I would do about 2 lbs higher in the rear...

Park2670 · 03-02-2008, 03:06 PM

I ran 38 all the way around with ok success. but i dont have staggered setup for the track. PS2s as well. A little outer tire wear but stock suspension. Gonna try and put more negative camber up front for my next day.

03-01-2008, 09:03 PM	#1
totoro Private First Class 21 Rep 122 Posts Drives: 335i coupe Join Date: Jul 2006 Location: CA iTrader: (0)	track tire pressure I just got a set of Michelin PS2's for my 335i coupe & was wondering what's the best tire pressure for these on track? Front 18" - 225/40 Rear 18" - 255/35 Door panel says to keep these pressures for the tires: Front 32 PSI Rear 35 PSI The other door label says to keep these pressures if going over 100mph: Front 38 PSI Rear 42 PSI Also, someone said if the tires make a screeching sound a lot on track, then that means they're under-inflated. Is that correct or is it if they're over-inflated, they screech? I forget. The PS2's stick like glue on track. oh yah, I like! Thanks __________________ 335i COUPE STEP PP SP NAV
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03-02-2008, 12:57 AM	#2
shimshimhada Brigadier General 487 Rep 4,838 Posts Drives: Portal Join Date: Jul 2005 Location: Portal iTrader: (2)	I start with 38PSI all around initially, then adjust throughout the day.
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03-02-2008, 02:01 AM	#3
S4to335 Brigadier General 460 Rep 4,380 Posts Drives: 2014 Audi A4 / 91 Track Miata Join Date: Jan 2007 Location: San Jose, CA iTrader: (5) Garage List 2007 BMW 335i sedan [8.00]	When my r compounds died...I put back on my Goodyear F1-D3s...and set them at 38 PSI cold...they worked ok..I just didnt want to wear off the outside edges...not worth it. __________________ Car is now gone .... :-(
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03-02-2008, 03:24 AM	#4
totoro Private First Class 21 Rep 122 Posts Drives: 335i coupe Join Date: Jul 2006 Location: CA iTrader: (0)	All around with the same PSI, even though it's staggered? I did not know that. ok, I'll do that next time. thanks y'all __________________ 335i COUPE STEP PP SP NAV
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03-02-2008, 09:37 AM	#5
S4to335 Brigadier General 460 Rep 4,380 Posts Drives: 2014 Audi A4 / 91 Track Miata Join Date: Jan 2007 Location: San Jose, CA iTrader: (5) Garage List 2007 BMW 335i sedan [8.00]	Normally...I would do about 2 lbs higher in the rear... __________________ Car is now gone .... :-(
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03-02-2008, 03:06 PM	#6
Park2670 General 361 Rep 18,218 Posts Drives: Tesla Model 3 Join Date: Jan 2006 Location: UTAH iTrader: (8)	I ran 38 all the way around with ok success. but i dont have staggered setup for the track. PS2s as well. A little outer tire wear but stock suspension. Gonna try and put more negative camber up front for my next day. __________________
	Appreciate 0 Quote