Safe Tire Pressure

longodj · 04-26-2008, 01:58 PM

Hey,
I was at the Motorsports NE autocross at Giants Stadium yesterday and I was pretty happy with my tires for stock RFT. I have them at 37 lbs all around right now but I'd like to induce a bit more oversteer. Would it be safe to go to 39 or 40 lbs up front?

Thanks,
Dave

sayemthree · 04-26-2008, 03:35 PM

tire pressure is very tricky. first you need to find the ideal psi for traction - say its 38. if you go higher you loose traction - if you go lower you loose traction. so if 38 is found to be ideal you could go F/R 38/40 or 38/36 and both will give you oversteer. either one you are lessening the rear traction.

some prefer more in the back for autocross as the rear tires are stiffer and break away quicker . for road course you would lower the back as the rears are then softer and more progressive, more slip angle to work with.

it takes a lot of experiementation.

04-26-2008, 01:58 PM	#1
longodj Major 75 Rep 1,288 Posts Drives: 135i Join Date: Jun 2007 Location: Rochester, NY iTrader: (3) Garage List 2007 335xi [0.00] 1974 VW Beetle [0.00]	Safe Tire Pressure Hey, I was at the Motorsports NE autocross at Giants Stadium yesterday and I was pretty happy with my tires for stock RFT. I have them at 37 lbs all around right now but I'd like to induce a bit more oversteer. Would it be safe to go to 39 or 40 lbs up front? Thanks, Dave __________________ Performance: UUC Sways CDV Mod KW V3 Vorshlag plates Pagid Yellow VK OC Hotchkis Brace STETT IC/CAI Braille B2015 VK Catless DP BMS JB3 M-Tech #1 Mod: AutoX/HPDE HPDE 3 Many Thanks: **********s UUC Motorwerks VK Motorwerks HP Autowerks SOLD
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04-26-2008, 03:35 PM	#2
sayemthree Major General 597 Rep 5,448 Posts Drives: ‘20 X3mC ‘20 Raptor ‘04 X3 6mt Join Date: Aug 2007 Location: usa so cal , AZ iTrader: (0)	tire pressure is very tricky. first you need to find the ideal psi for traction - say its 38. if you go higher you loose traction - if you go lower you loose traction. so if 38 is found to be ideal you could go F/R 38/40 or 38/36 and both will give you oversteer. either one you are lessening the rear traction. some prefer more in the back for autocross as the rear tires are stiffer and break away quicker . for road course you would lower the back as the rears are then softer and more progressive, more slip angle to work with. it takes a lot of experiementation. __________________ Fore Sale Rare 6 speed manual X3 3.oi silver over grey. PM me
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