'95 993

Hi Bill,

Try Colin Belton [colin@ninemeister.com] he is the guy who sourced and fitted the parts - pics at the weekend

John

Jean

Here is an earlier thread with more info on hard plastic bushings and a watchout. Also info on where to buy if still decided. They might be different than the ones Colin uses but worth reading.

https://rennlist.com/forums/showthre...light=bushings

'95 993

Jean,

pretty certain they are not plastic, also only on the rear - they definitely have not affected the steering in anyway or the feel of the car, the just seem to control the rear end self steering when you don't want it to, i.e. on the limit on a bend, after turn-in, when you feed the power in for a max power exit up the straight, also when you overcook it a bit and want to correct the back end stepping out, I had experience of the rear "self steering" as you correct it and it swings from side to side which is not what you (I) want when it starts to go pear shaped!! This is the biggest area of difference, very controllable rear end - not flabby and wobbly now!.

I will post some pics over the weekend and all should be revealed (expect who manufactured them!!!)

John

Bill Verburg

The 993RS used harder rubber bushes for front control arms and rear A arm and castor arm. Are they available separatly?

Terry Adams

Could this be the
kinematic toe explained in the alignment section , which Porsche designed in, same as the "Weissach effect"? Maybe it is appropriate for the track and not the street.

Jean

John, it seems like Colin has done a proper rear kinematic toe adjustment and alignements that are what have really improved your ride. The difference tends to be fantastic when done properly. Enjoy it!

Bill, for RS swap, you need to buy the complete arm assembly.

Bill Verburg

o,r I assume, the ERP parts?

TomF

Pics?! Please post when you get a chance..

Jean

Yes. ERP would be stiffer and more track oriented however. Another alternative is CUP parts. I have a mix of both on my chassis.

Bill Verburg

Care to share?

Jean

All mods done in Germany, you will only find them from Porsche Motorsport.
You have a PM.

clubsport1

John, good to see you at Brands last week your car certainly sounds and goes great!

The rear axle kit is basically the bushing from the GT2 version,,,,,a common mod for the 993RS as well.

NineMeister

The stiff axle kit is a conversion to the subframe bushes, not the suspension arms and was a modification done by Porsche on the GT2 model to improve rear axle location under load. We simply remove the subframe, press out the bushes and fit the solid mounts. This also has the benefit of changing the rake of the axle which improves handling.

I have the kit in my RSR and have only one regret....that I did not fit it sooner!


We suspect that Johns car had low octane fuel in it when it was mapped because it did not take a lot of ignition timing, so it would possibly make the expected 320bhp if reworked on Optimax 98.5 RON, although I still would prefer to run small bore headers to improve the torque.

Jean

Colin, those are the parts I was referring to as Cup parts.

I thought the RSR/GT2 race and Cup cars all had them stock from the factory, did you have to add them on your RSR?

NineMeister

My car is a RS Clubsport AKA RS-R as opposed to the full race RSR, so it came with standard RS rear suspension. The only other car that I have seen them on from Porsche was a 993 GT2 Clubsport, but you are probably right about other late factory racers.