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joetiii joetiii is offline
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Join Date: Apr 2006
Location: Western Mass.
Posts: 1,218
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Suspension setup question

So I'm not sure if this post should be in this forum or AutoX/Racing forum, But I need help setting up my old 911.

When I got my 69 three years ago, the first thing I did was upgrade the suspension. Did it right at Musante Motorsport in Ct. Upgraded the torsion bars to 21 frt/27 rear. ER polybronze bushings & monoballs, adjustable springplates, Bilstein HDs, turbo tierods, lowered balanced and aligned. It has a 20 mm sway bar on the front w/ nothing on the rear. We kept it that way cuz Chris wanted a bit of understeer built into it.

Now I'm starting to autoX and getting to know the car quite well. In Hartford, we have a very tight course and the car pushes around pretty good on this tight course. Everyone always marvels how I get so much inside wheel lift on my car. From what I know so far, the torque of the 3.0 SC has a bit to do with that body twist as well as a having no rear sway bar. From what I've been sensing, the wheel lift really hasn't affected traction since these lifts happen at less that 30 mph and the front tire seems to hold well at that speed.


I attended a higher speed event last week at Ft Devens in Mass. & was looking forward to a more open course with less hairpins. Boy what a difference. The car was much more tail happy at speed and I found myself correcting the wheel and back on the throttle to stay pointed in the right direction. (OK, there was one run that I couldn't correct quick enough and a spin resulted). My thought was that my tail happiness at higher speeds could be settled a bit with a rear sway bar. It would also help, I Think, to keep my front wheels a bit more planted on tighter slaloms.

But then I've read that many guys will disconnect the rear sway bar during a tight autocross & I'm not sure why?

My question simply is do I need to install a rear bar?
or...Can I just run front adjustable sway bar links to dial out oversteer?

If I'm at that point where a rear bar is needed, what size?
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joe
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'69 911 E Targa - aka "RoxiE"

Last edited by joetiii; 10-08-2008 at 05:15 AM..
Old 07-19-2008, 05:13 PM
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