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      09-03-2012, 08:21 PM   #52
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Drives: 11 E90 M3
Join Date: Jan 2008
Location: Redmond, WA

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Originally Posted by bigjae1976 View Post
The Schroth harnesses are specifically designed to be used with stock seats. They are a 4 point, they're supposed to prevent submarining (don't wanna find out), and are DOT approved. My unexpert opinion is that I'd rather be in the seat and get my head crushed, maybe, rather than getting thrown around in the car..
FYI - Those ASM harnesses allow you to flop around quite a bit after a frontal impact because the ASM bit allows for quite a bit of stretch on that side with the ASM module; this is how they prevent submarining. They effectively become a three point harness after a frontal impact.

So, their main purpose is to provide more support during track driving, and not so much after an impact, in which case they are more like stock belts.

I used to use these but now just do the "slide seat back, lock belts, slide seat forward" method of using stock belts; works almost as well as those ASM harnesses for me.

To the OP, I'd recommend, in order:

- camber plates with -2 to -2.5 camber (I like -2.2)
- track pads
- more aggressive tires like the S3 (I like the AD08s)
- coil overs