I was putting a fair amount of muscle behind it...seems to me like its pretty well shot

Also, i noticed that the horizontal shaft from the steering rack was pretty yielding when extended. The rack is not loose...is that normal?

 

Ya...thats a goner.

 

The upper control arms (A-arms) are discontinued by Porsche but rebuilt's are available from 928 Int'l and Roger/928sRus. All you gotta do™ is un-do some nuts and swap.

If you mean the tie-rod from the rack to the steering-arm on the spindle, those should be tight. The ball joints at the inner end (where it attaches to the rack, under the boot) get worn and loose. Pull the boot back and put your fingers on the joint and have a helper wiggle the steering wheel-- the tie-rod and ball-joint should move together. Or just change them, they are cheap and easy compared to the upper control arms.

You'll need to re-do the alignment, but with things being that loose, "alignment" is a pretty indefinite term.

 

I'm thinking about making my own poly bushings...i want a not crazy firm poly...with a delrin center bushing sleeve.... I should probably created another post about it and see who else by want me to make extras while I'm at it

 

@Speedtoys in 3.....2......1

If the front uppers are that bad, the chances of all the other bushings needing some attention is very high. All the bushings are available in OEM spec from 928 International.

In case you missed this thread, the missing link for decades was the bushing in the Weissach rocker bars, which are now available:
https://rennlist.com/forums/928-foru...cker-bars.html

It will be interesting to see how your poly experiment turns out. One of my cars is mostly a track car, I'd be interested in what you come up with. My next project for this car is updating all the suspension.

 

Ya..poly "works"..but you should understand how 928 bushings work first.

They are spring rate, not just dumb rotating isolators.

 

I installed the power flex bushings linked below along with all the others. They work great. The uppers are really involved on a 928 and make a significant difference in steering precision and wander.

https://www.powerflexusa.com/shop/pr...2386#attr=1197

I also upgraded to Delrin rack mount bushings and machined my own internal rack support bushings from Delrin. This was all done in a desperate effort to remove steering lash and get my 928 to steer and feel as precise as a modern car and after much work it's fantastic.

 

The only reason why I haven't installed their bushings yet is I want to do the whole car, not just the front. I've talked to them about doing the rears, it would probably take X number of folks to be on board first.

 

i would use the powerflex busings, BUT i'm wanting a poly compound that's more firm than rubber, but not as hard as most poly busings. AND, I want a thin delrin sleeve in the middle so that i won't have to deal with squeak/stickiness. I see that they have the slots that theoretically hold lubrication but it seems to me that those slots also allow a high pressure car car wash to rinse out the lubrication..? maybe a fairly soft silicone washer that's larger than the fittings on the control arm could be sandwiched in and form a seal that would keep the lubrication where it needs to be...?

 

I have no squeek at all and the ride is fantastic. I run good tires though. 19 inch cup2s for track and 18 inch Conti DWS the street. I would say the ride is actually better than stock. The suspension can move more freely with the poly bushes and the 928 no longer feels like I'm driving through mud all the time.

 

I'm not saying that Polyflex bushing are perfect....
But for what it is worth, the "ends" where the "cross hatches grooves" are exposed on a Polyflex bushing are covered by covered by washers.
There's not going to be any water washing the lubricant away....no matter what the pressure is.

 

You will need to be careful, in the back, in order to not remove the Kinematic toe of the 928 rear axle.

 

Did you change the front spring rate to compensate for the loss of spring rate from the rubber bushings?

 

And the rebound shock rate where the bushings also arrested rebound as well beyond horizontal (level).

 

Whats your understanding of a 'high pressure' car wash...anywhere on the car, not even thinking of below it..