View Single Post
911st 911st is offline
Registered User
 
Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
Lets double check as I am more up on the normal Carrera.

On a stock 930 set up is a 18.8f and 26r for 110lbs/165lbs or 40%/60% front rear spring rate distribution.

A 33mm rear is 427 lbs and to match stock we would want a 285lb front spring. Well, I was off a little for the turbo. It seems a 33 rear might match up with a 24mm front very well. I guess you might be able to run this set up with close to equal size sway bars. Such a set up would be about 264% or 2.64 times stiffer than a stock turbo.

It was not until recently that we even had access to a 24mm front torsion bar. With the 24 mm front one really must run the hard Poly Bronze bushings or the bars will quickly interfere with front torsion tube and become comprimized.

To redo, if one wanted to match the turbos 40/60% spring rate distribuition the natural matches would be:

21/29
22/30 or 22/31
23/31 or 23/33
24/33

A normal 911 run spring rates that are closer to 45% front and 55% rear thus typical matches are:
21/27
22/28 or 22/29
23/30
24/31

24/33 needs a relatively larger front sway bar to more closely match the factory balance. (This is where the 27f/22rear came from.)

There are exceptions to the above. If one is running autoX stiffing up the rear will let the car rotate faster (less rear bite). Stiffing up the front makes the car faster in big sweepers (inside rear tire works harder).

I would very this will an real expert.
Old 02-20-2009, 03:47 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #39 (permalink)