I got the above from this tread. Just to double check, if I interpret this correctly, is the part number for
- option 474 red Boge 928 343 055 09/17
- standard (green?) shocks 928 343 055 07/16 ?

 

my 87 did not have the sport options but i wanted it. from 87-89 M474 was the S4 sport option which had the regular springs and Boge red shocks. 89-91 GT had the M637 option using the Boge red shocks and stiffer springs. The shocks and springs are still available from Porsche. Some of the stuff is not available in the U.S. though and has to be ordered from Germany (an extra $20 for expedited which should get it to you in 1 week). I have found it that most of the stuff is still available no matter what you are told... only not locally stocked.

 

" .... for every action ( in this universe), there is an equal and opposite reaction ..."

With Koni gas shocks installed on my '80 for the last several years, it has transformed the car into one of the most responsive and best balanced suspensions I've ever driven - such that another set of Konis were installed on my S4 last summer - and they are equally good. Every ripple to pothole is instantly damped, and even in my most ham fisted misjudgment at speed, I've never bottomed out the shocks. In those 'rare' situations when you know that the bump you're about to hit too fast reflexively causes your molars to clench and sphincter muscle to tighten - the Konis have sucked it in, and at worst allowed the front to 'grab air' on rebound ... but no bottoming. Bilsteins are at least the equal of these, and are on my BMW .... just so I'm not drawing a line in the sand over favourites ...

Bill, I have a hard time conceiving of a spec Koni ( or any other brand) bottoming out unless there is worn/broken/whatever condition internal to the unit - for which Koni have a life time warranty. The alternative is that the rebound adjustment may be cranked in so tight that the shock cannot recover its height after compression; If the compressions are sufficiently frequent and severe, the shocks may well ratchet themselves into a non responsive steel post state ?????? ie - 'bottomed'

So, Bill, you old dog, you ... you just drive harder than I : Keep it up, and the very best of the Season!!!

 

My 89 Gt shows the 474 option, and what is in the car are the red boges.....

 

US 78-86 Early (86 up to Vin# 998 ) used Bilsteins for M474 and 86.5-95 used Boge Reds for M474

Euro 78-85 used Bilsteins for M474 and 86-95 used Boge Reds for M474

Edit: Also I have heard of Konis being used sometimes on the eariler 928s with the M474 option, but can't confirm.

 

Dave,
I have a full set of M474 springs pulled from a '85 euro S (310 hp) that had Bilsteins all around: The fronts are 2 x green stripe, and I had wondered about putting them over the Konis in the S4, which now wears the std. 2 x brown stripe springs. However, other than guessing that they are ~ 15% stiffer than Std S4 springs, I did not install them.
Any idea if the M474 '85 euro option would be a stiffer spring? I also have a set of these 2 x green stripe over Konis in my '80 - it is stiffer than the S4, and more to my liking - but that may be due to lesser vehicle weight ??
I've never been able to find any meaningful spring rate data, but am of the impression that all M474 cars were more firmly sprung to complement the better shocks.

khalloudy, please excuse the hijack

 

I removed my 86.5 M474 shock assemblies in favor of the adjustable Konis. They are red Boge also. Still have them. I took them off at 60k. They're still in good shape, but I like the Konis better.
Hammer

 

Yes, very hard to explain unless all 4 are broken and were so from day one. Marc Thomas rode in my car recently and said, "You need to turn up the damping." The damping is all the way hard (using Carl's tool). I haven't had time to take them off and send them in to Koni for a rebuild. If they tell me there is nothing wrong with the shocks, I'll throw them away and go to Bilsteins.

 

The 928 work shop manual have a section on the different spring colors. Don't have it in front of me right now.

 

Your interpretation is correct to PET 6 although the standard shocks are a greyish colour.

 

Thanks to all for knowledge and insight!
I wonder if it is possible to use Eibach springs with red Boge's, or should I opt for the CS option M637? I get an ok price on M637, but what I wonder is:
Front seems to be part no 504 'orange' 928 343 511 12.
But rear, parts no 928 333 531 14, comes in 4 types (spring rates??) 301 to 304. Does anyone know what type is the correct one...?

 

Only the front springs were stiffened with the sport option IIRC: as you already have the red Boge 'Sport', I would clean up your current springs to check the paint colour .... you may already have the 504s!!
The rear spring rates were more a function of what options were fitted, ie AC, rear AC, etc.

 

This is not for me, but another guy with an 88 would like to replace his Boge red originals with new Boge red.

How do you order them? You mention Porsche. Woud you go through a local dealer; one of our vendors?

 

I just ordered a complete set of Reds (928.333.055.09 front, 928.333.051.17 rear) for my 90 GT from Jeff at Sunset Porsche for $838 delivered. They came from Germany and took about 4 weeks.

EDIT: Speeling...

 

Rob:

Excellent! When you get them installed, go out to your favorite twisties and tell us what you think.