Is this Koni acceptable for track use?, 72-73 Red self leveling Options

[MikeSpraggi]

I have a pair of 72-73 911 "Koni only" struts with 3.5" SC calipers. The only Koni inserts I can find for them are sefl-leveling "reds". I am thinking of installing these on my track car that will be used for DE events for the foreseeable future. What is this "self-leveling" system these shocks use? I take it they are not adjustable shocks.

Will these shocks give me acceptable performance when pushed hard on my 1970 teener with 2.2 six semi-race engine? Koni "reds" will also be in the rear. Thanks.

[Richard Casto]

I can't speak to the self leveling stuff, but (assuming we are talking about the same strut) you can use regular Koni "yellow" sport inserts in those struts. When you buy the Koni yellow they sort of assume you are installing them in Boge struts, so they come with a centering ring and Boge specific gland nut. If you use them in the OEM Koni strut, you just need the special gland nut that matches the OEM Koni strut.

I have OEM Koni struts (91134104110 and 91134104210) that I am rebuilding. The gland nut you need is Koni part number 73.25.01.0111.1. I got mine from Paragon Products.

See here for photos of my rebuild...

http://motorsport.zyyz.com/project_914_03_25.htm

I need to powder coat a few more things and then rebuild my calipers and then I am going to put it all back together again.

[jcd914]

I can't speak to the self leveling stuff, but (assuming we are talking about the same strut) you can use regular Koni "yellow" sport inserts in those struts.

This was not the case with the Koni struts I had (73/74? 911 S struts w/ 3.5" brake spacing). The inside diameter of the strut at the bottom (where the spindle is attached) was too small for the Yellow Koni insert to fit. The top of the strut tube was larger in diameter but the bottom was smaller.
Koni used to offer a standard hydraulic replacement insert, not a sport or gas insert for these struts.
I stuck with the 911 T struts w/ 3" brakes and Koni Yellow Sport inserts.
It was a number of years ago that I looked into this and availability may have changed and I may have had different struts.

There was a pneumatic front suspension used on some 911s. They used no torsion bars and were not considered (by some) a good or even safe option for track use.

Good Luck
Jim