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Old 08-16-2011, 01:34 PM
SD ///M4's Avatar
SD ///M4 SD ///M4 is offline
(prev. SD335is & SDZ4MR)
Location: San Diego, CA
Join Date: Jan 2011
Posts: 4,476
Mein Auto: 2016 M4 Coupe | 2006 Z4MR
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.
- Tom
His: 2016 M4 Coupe | Sakhir Orange Metallic | Black Full Merino Leather | CF Trim | M DCT | Adaptive M Suspension | 19" Black Alloy Wheels | ZEC | ZLP | ZDB | MPE | ED 5/13/16
Hers: 2011 335is Couipe | Le Mans Blue Metallic | Black Dakota Leather | Dark Glacier Aluminum | 6MT | ED 5/12/11
Also His: 2006 Z4 Roadster (E85) | Interlagos Blue Metallic | Black Extended Nappa Leather | Carbon Leather Trim | Purchased 7/19/12

Last edited by SD ///M4; 08-16-2011 at 01:49 PM.
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Old 08-16-2011, 06:45 PM
grayghost grayghost is offline
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Location: Marietta,GA
Join Date: Jan 2003
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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.
2004Ci 6sp manual, sport pkg, Titanium Silver/gray leather, UUC Swaybars, H&R springs, Blistein Shocks, UUC SSK, CDV delete, Autobaun miles (European Delivery)
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