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  #1  
Old 08-16-2011, 01:34 PM
SD Z4MR's Avatar
SD Z4MR SD Z4MR is offline
(formerly SD 335is)
Location: San Diego, CA
 
Join Date: Jan 2011
Posts: 4,255
Mein Auto: '06 Z4 MR | '11 335is E92
Portable air tank or 12V air compressor?

I just did my first autocross in our new 335is Coupe (won 2nd Place in TS!).

When I used to autocross my S2000 I had a portable air tank that I took with me. It's well past the expiration date on the tank and the tire chuck doesn't work anymore so I decided to buy a new air tank. But after some research a 12V air compressor would probably be smaller and more versatile. I'd like to know what other drivers use that autocross or track their car.

What makes more sense, a portable air tank or a decent 12V air compressor? If a 12V air compressor, which one?

Also any recommendations for tire pressure for autocross for an E92 with staggered 18" high summer performance Michelin Pilot Sport PS2 ZP, 225/40 ZR 18 88W front and 255/35 ZR 18 90W rear tires? Tire pressure on the door jamb is 33/41.
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Last edited by SD Z4MR; 08-16-2011 at 01:49 PM.
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  #2  
Old 08-16-2011, 06:45 PM
grayghost grayghost is offline
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Location: Marietta,GA
 
Join Date: Jan 2003
Posts: 272
Mein Auto: 330ci (and Archer II)
I started off using an air tank. It seemed more "professional" and allowed quicker filling/adjustment (as long as I had good pressure). I also was concerned about running down my battery.
After that tank developed a slow leak and caused me some problems, I've gone to a 12v compressor. A decent quality compressor will be smaller, lighter, and will work plenty fast enough.
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