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Motorsports & Track Forum
From Auto-X to Trackday to Racing and Professional Motorsports this is the place to discuss making BMWs fast

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Old 03-18-2004, 12:21 AM   #1
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Join Date: Aug 2003
Location: Margaritaville
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Auto-x guys: questions (plus, my 1/4 mile time inside)

I went with a friend to a track about 500 feet above sea level. Temperatures were in the high 30's0-low 40's. I was reading 38 degrees and my friend was reading 41 degrees on his computer. He had a C32 amg and I had the E46. My best run was a 13.501 at 105.?? I forget right now. I cut a 2.2 60' time. My car is an SMG. I did not do launch control, just tried to modulate out of the gate and minimize tire spin. I ran it as I drove it, 3/4 tank of gas, normal air pressures etc. I definitely feel I can shave .2-.3 seconds off that time with a little more seat time in the car. My friend ran a 13.479 at 106+ ... thus, I think his car is faster .. damn FI'd cars liking colder air!!! I think if I dropped rear tire pressure to 28 psi and pumped the fronts to 42-44, I should drop some time. If I can hit 13.2 one day, I'll be happy. I just wished I would trap 108 .... that is a goal to hit as well! Yeah, I know, I need about 30 more rwhp to achieve that .... grrr!!! Or, lose about 300 lbs from the car ....

Anyway, more to the point ... auto-x guys -- what pressures are you running with 245's up front and 275 rears (18") ...??? I am thinking of running 42 psi up front and 38 psi in the rear and then playing around with it from there. should I go 44 psi in the front and 39 psi in the rear or is that to much still for understeer, should I go 42 psi at all four corners?

Should I do the camber trick for upfront???

At the track, what are you guys running? I am talking HPDE events ... I ran 33 psi up front and 31 psi in the rear, is this about right?

Also, does anyone make a harness bar for the E46 coupe? I would like something for auto-x .. i have four points right now I could use (camlock harnesses) -- actually 5-points; but, don't need to hook the submarine belt up ... is there a harness bar that I could get for a decent price? I would prefer not to invest in schroth 4 harnesses since I like my camlocks ...
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Old 03-19-2004, 09:47 AM   #2
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I am planning to do my first HPDE. Was your car OK with those tire preassures. I ran autox before with 42psi fronts and 37psi rears. Keep in mind that in autox you are only doint one run at the time. When tire preasure are too low I feel the car loosing grip.
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