Porsche 930 Upgrades Continues Rennsport Kansas City

Widow Maker Part 3:

Made some decent progress on the 930 project this week in between everything else. First I started tackling the rear suspension, starting with the torsion bars and poly bronze spring plate bushings. The side skirts need to come off.

Disconnecting the spring plate from the rear trailing arms.

And the old torsion bar after the spring plate has been removed. A little persuasion and it comes right out……

Passing out the side of the body.

And the new larger torsion bars greased up and installed.

Then you must remove the old rubber bushings from the spring plates. A lot of heat is used.

JB welding the bushings to the spring plate.

And this is what we end up with. Once they are reinstalled in the car at the estimated angle, everything is hooked back up to the trailing arms and ride height is checked. If it is off, then the torsion bars must be reindexed until everything is right.

Then it was off to replacing the rear shocks. The driver side came out easy enough, but the passenger side I had to cut apart to get it out, The nut had seized itself to the threads and the little 5mm allen to counter that didn’t hold up well.

But eventually I had a new set of shocks in place.

Then it was off to mocking up the turbo and exhaust install. Hmmmm. With the B&B’s I usually use, I am use to having everything come as a kit, and it appears we are going to have to piece this thing together a bit to make it work. Not a big deal, just a few hoops to get through. Stay tuned. In the mean time, I’ll button up the rest of the suspension, etc. Which brings up another issue, our new tie rod length is so far off that I can’t dial the toe out of the front end. Need to make a call to Elephant Racing on Monday to sort that out.

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John Flesburg

May 20, 2012 at 12:10 PM

If you are close, those adjustable spring plates can be adjusted so that re-indexing of the torsion bars is not necessary. The adjustment is made with those two thin head eccentric bolts closest to the torsion bar. Those split spring plates were introduced in 76 or 77.


    May 20, 2012 at 12:13 PM

    That is correct. Usually adjustment is limited to about 1/2″

John Flesburg

May 21, 2012 at 9:08 PM

I just upgraded a 74′ 911 to the later model aluminum trailing arms and used the Elephant Racing poly-bronze bushings too. I had to use polyurethane glue to glue the bushings into the torsion tubes since they were a loose slip fit. I didn’t have to do that with my 83′ 930. Did you have to glue these bushings in? (Of course, the inner races were glued to the spring plates on both vehicles).

Been to Heartland Park recently? My dad and I both miss that place since we moved away.


    May 21, 2012 at 9:16 PM

    They were snug enough that I did not feel they needed to be glued. I could see how they would vary though car to car.

    We were at HPT in april for the club race, probably won’t be back until october DE as the May MVP date (former audi weekend) was canceled.

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