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kellcats521 kellcats521 is offline
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Join Date: Feb 2005
Location: Atlanta Metro
Posts: 219
On the combo of torsion bar and coilover - this has been done many times by factory Porsche race cars. It IS a great way to get a higher spring rate on a 911 w/o killing the upper shock mount with a big spring in a coilover 'only' setup. Extra weight (vs a c/o only setup really - adding a coil is about 2-5 lbs more than the OE torsion bar) might be an issue and correct shocks are needed, but there is a lot of merit in using a coil to remove squat (with the stock bar) rather than going to a huge torsion bar. If you go to a big bar, you really need to upgrade or revalve shocks too, so it's actually cheaper to go to a correctly valved coilover shock with the added spring.

Just as any other suspension mod., I'd hope that the installer has some idea of what they're doing, and how to set up the system they're installing/modifying..... And, on that note, I had no idea that IA was doing race/high performance street suspension work.
Old 03-11-2007, 12:17 PM
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