cobalt

Was it the rears you were concerned about or the fronts? The rears never use a locking collar only the fronts. I was concerned about the rears rotating without a collar and I put some paint to verify if they move and found after many thousand miles and autocross events there was no movement.

Have you tried slidding a larger dia pipe over the shock butting up against the threaded collar and using heat and a press or a large hammer?

wds928

Anthony:

Yes, it's the rears I was having trouble with. Couldn't get a pipe end over the mounting end of the shock. I used large channel locks and a hammer, and got it to move, but it was getting pretty beat up. My new collars arrived this morning, so after softball tonight, I'll get it put together. If it's a tight fit, I won't need JBWeld, but so far my experience has been that Koni's are a bit smaller diameter than Boge's. I'll post some pics tonight to show what the old collars looked like, compared to the new ones.

ROG100

Bill,
Are you replacing the original Boge's?
If so were they shot or did they have life in them?
I am torn between changing mine for Boges or going the Bilstein route.
I am not an aggressive driver so do not need the extra raodhugging capabilities.
Just need a good ride (as the bishop said to the actress).
Any thoughts please?
Roger

wds928

Roger, these Boge's look like the originals, with 136,000 miles on them. They are pretty soft. Plus, I've had the rears in and out of a vise trying to remove the threaded rings.

For all the work I've done tring to remove threaded rings, etc, I think Bilsteins, with the outer shell already threaded, might be the better choice.

The Eibach springs I'm putting on are about 3 inches shorter in uncompressed length than the factory originals, but those are linear and the Eibach are progressive springs. Overall height is the same.

I have set the Koni's at 3 turns from softest, out of 5 turns total. One turn is 180 degrees. We'll see how this works. I let you know.

6.0-928S

Bill,
This setup isn't cheap but I was glad I spent the money. Check it out,
'www.pegasusautoracing.com/group.asp?GroupID=SHOCKWRENCH'
Hammer

worf928

I just swapped the stock boges out of my '91 GT; they were toast.

Now I have four of these old boges in my garage. Are they garbage? Or do they have some residual value? New ones are short money - about the same as what I was quoted to rebuild a set of Konis. Is rebuilding them a DIY project?

ROG100

They are garbage as far as I know.
I think purly on a cost basis that I am going with Boges gas filled, exactly as stock.
I have some GT springs that Ernie took of his car I may try them ( I will check with Ernie first).
Roger

worf928

Since my '91 will not do track duty anymore I may do the same and offer the Eibach/Bilsteins I just put on it for sale. I am not sure that I am pleased with the combo. I may also try a few variations of Boge/Bilstein/Eibach/GT before making a call.

(On the other hand I am pleased with the Eibach/Koni adjustables I have on the '89. But, the purpose of the '89 is track duty. I need to do some back-to-back comparisons on the same roads and conditions before I make any calls.) And yes, JB Weld was used ...

cobalt

Dave,

I had the stock Boge sport suspension in the car and surprisingly the shocks were still working albeit stiff. I found that in both my turbo and 928 that the Boge's had gotten stiffer instead of softer. It appears they do this before they blow out completely.

Since my car is a street car no track duty I wanted to stay somewhat close to stock. Sorry, but never liked the Boge product sport or otherwise. So I went with the front springs from the earlier Bilstein Sport suspension that Porsche offered before switching over to Boge. Bilstein threaded shocks and the 928 specialist sways. The car handles great for a street car not stiff but handles very flat with a comfortable but solid ride. IMO the perfect street set up for these cars.

worf928

Anothony, looks like my Boges went through the stiff phase about 5-10k miles ago because there were most definitely toast as of this spring. I didn't really realize how bad they were until I drove the '89 back-to-back with the '91 on similar roads. It was very obvious that the boges were deceased - porpoising through corners, and generally bouncing around in a very non-supercar way.

Thanks for the data point. I don't have any opinion about the Boges - I just don't want my GT to be as nervous as it is now. Not that it is THAT nervous just a bit more so that what I recall when the Boges were working and not as controlled as my '89 with the Konis. The easiest option for me at the moment is to swap the progressive Eibach springs out for the old GT springs with the new Bilsteins and see how it works.