Autocross with e90 335i stock tire pressure? - BMW 3-Series (E90 E92) Forum

bg_27 · 05-24-2007, 04:50 PM

I am going to a autocross class and they talked about raising the tire pressure by about 10-20psi over normal before going to the track. Should I add about 10psi to my stock tires (sports package)? Is that recommended with RFTs? Anybody else have experience with this?

leftcoastman · 05-24-2007, 05:11 PM

Running at stock pressure will result in very chewed up tires, especially front. You should see my tires.

S4to335 · 05-24-2007, 05:25 PM

Quote:

Originally Posted by bg_27

I am going to a autocross class and they talked about raising the tire pressure by about 10-20psi over normal before going to the track. Should I add about 10psi to my stock tires (sports package)? Is that recommended with RFTs? Anybody else have experience with this?

8-10 maybe..not 20 lbs over recommended pressure.

bg_27 · 05-24-2007, 05:26 PM

For the autocross should the pressure be the same in all 4 tires? At the class they said for rwd to have all 4 tires at the same pressure.
The manual says that the fronts run at 32 and the rears at 38.

oneshare325 · 05-24-2007, 05:34 PM

Quote:

Originally Posted by S4to335

8-10 maybe..not 20 lbs over recommended pressure.

yea 20 sounds like ALOT!

bg_27 · 05-25-2007, 12:53 AM

i ran 42 all around, hard to tell the track was rainy and wet

ward · 05-25-2007, 12:54 AM

you don't need to bump them up quite as high as non runflats

but you should have at least 40 psi in all 4, probably 42 front 45 rear or so

shimshimhada · 05-25-2007, 01:18 PM

I run 38f 32r for less understeer at autoxes. Or you can do real overinflation in the rears for mad oversteer.

05-24-2007, 04:50 PM	#1
bg_27 Second Lieutenant Drives: E90 335i (2007) Join Date: Jun 2006 Location: Calgary, Canada Posts: 257 iTrader: (0)	Autocross with e90 335i stock tire pressure? I am going to a autocross class and they talked about raising the tire pressure by about 10-20psi over normal before going to the track. Should I add about 10psi to my stock tires (sports package)? Is that recommended with RFTs? Anybody else have experience with this? __________________ 2010 335i xDrive Sedan Saphire Black Metallic \| Saddle Brown Leather \| M Sport Package \| 2008 X5 4.8i M Sport Edition Ruby Black - Individual \| Saddle Brown leather \| Bamboo Trim \| M Sport Package \|
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05-24-2007, 05:26 PM	#4
bg_27 Second Lieutenant Drives: E90 335i (2007) Join Date: Jun 2006 Location: Calgary, Canada Posts: 257 iTrader: (0)	For the autocross should the pressure be the same in all 4 tires? At the class they said for rwd to have all 4 tires at the same pressure. The manual says that the fronts run at 32 and the rears at 38. __________________ 2010 335i xDrive Sedan Saphire Black Metallic \| Saddle Brown Leather \| M Sport Package \| 2008 X5 4.8i M Sport Edition Ruby Black - Individual \| Saddle Brown leather \| Bamboo Trim \| M Sport Package \|

05-25-2007, 12:53 AM	#6
bg_27 Second Lieutenant Drives: E90 335i (2007) Join Date: Jun 2006 Location: Calgary, Canada Posts: 257 iTrader: (0)	i ran 42 all around, hard to tell the track was rainy and wet __________________ 2010 335i xDrive Sedan Saphire Black Metallic \| Saddle Brown Leather \| M Sport Package \| 2008 X5 4.8i M Sport Edition Ruby Black - Individual \| Saddle Brown leather \| Bamboo Trim \| M Sport Package \|

05-24-2007, 05:11 PM	#2
leftcoastman Lieutenant Colonel Drives: 335i Join Date: Jan 2007 Location: Near some canyons Posts: 1,707 iTrader: (1)	Running at stock pressure will result in very chewed up tires, especially front. You should see my tires.

05-25-2007, 12:54 AM	#7
ward Lieutenant General Drives: F Join Date: May 2005 Location: T Posts: 6,184 iTrader: (0)	you don't need to bump them up quite as high as non runflats but you should have at least 40 psi in all 4, probably 42 front 45 rear or so

05-25-2007, 01:18 PM	#8
shimshimhada Brigadier General Drives: > Bugatti Veyron Join Date: Jul 2005 Location: DC Metro Posts: 4,883 iTrader: (2)	I run 38f 32r for less understeer at autoxes. Or you can do real overinflation in the rears for mad oversteer.