90 GT......stock shocks and springs
#1
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90 GT......stock shocks and springs
The title is the question.............what was the stock suspension set up?
Was it the same as the S4 unless customer specified sport suspension?
The car has the blue/grey shocks which are assumed to be Boge.
Was it the same as the S4 unless customer specified sport suspension?
The car has the blue/grey shocks which are assumed to be Boge.
#2
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Standard shocks are Boge, Sport Bilsteins were optional.
#3
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If they're gray and original and there's no '474' on the options decal, then they're the stock suspension for that car.
See https://rennlist.com/forums/928-foru...unt-on-it.html
See https://rennlist.com/forums/928-foru...unt-on-it.html
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Weren't the GT springs different though?
Hmmm... PET only shows 2 springs. One is M637 (Clubsport)
Hmmm... PET only shows 2 springs. One is M637 (Clubsport)
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#8
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Dunno whether there was a 'special' spring for the 474 optioned GT, but the 3 brown marks were the highest spring rate in the three tolerance groups. Lots of info on spring tolerance groups on WSM 40-46 to -48.
My 90 GT with the 474 option originally had 3 brown marks on the front springs, Boge Reds, and 1 blue mark on the rears. I replaced the fronts with CS springs (2 orange marks)
My 90 GT with the 474 option originally had 3 brown marks on the front springs, Boge Reds, and 1 blue mark on the rears. I replaced the fronts with CS springs (2 orange marks)
#9
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Thx Rod.............my '88 S4 had 3 'brown' marks and I now recall discussion years ago of 'orange' marked springs.
So................a full sport suspension as offered as options by Porsche are the red Boges 474 and the 'orange' springs?
I did read the WSM........the suspension sections are as confusing as the motor mounts
So................a full sport suspension as offered as options by Porsche are the red Boges 474 and the 'orange' springs?
I did read the WSM........the suspension sections are as confusing as the motor mounts
#10
Thx Rod.............my '88 S4 had 3 'brown' marks and I now recall discussion years ago of 'orange' marked springs.
So................a full sport suspension as offered as options by Porsche are the red Boges 474 and the 'orange' springs?
I did read the WSM........the suspension sections are as confusing as the motor mounts
So................a full sport suspension as offered as options by Porsche are the red Boges 474 and the 'orange' springs?
I did read the WSM........the suspension sections are as confusing as the motor mounts
S4 and GT (M639) have grey Boge dampers and brown-marked springs in the front and blue marked springs rear.
M474 (both S4 and GT(M639)) have either Bilsteins or red Boge shocks, but the same springs.
Club Sport (M637) normally has the M474 and always M637 springs (orange-marked) in the front. Standard springs (blue-marked) rear.
As pointed out earlier there may be several paint marks on the springs, to identify tolerance as per WSM.
As a curiousity the Club Sport has the same brakes and the same suspension, except front springs as a M474 S4.
Ragnar
#11
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'89 GT might have had M474 as standard for some markets (not in US) but '90-91 definitelly did not. No other model except maybe UK only SE (S4 Sport) should have M637 springs from factory. IIRR M474 shocks were changed from Bilstein to red Boge in '89 MY.
#12
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Excellent clarification............thanks. I wonder if the M637 spring was optional.
No matter, its all 20YO and with Marks super sale on Eibachs I know where I'll be headed
No matter, its all 20YO and with Marks super sale on Eibachs I know where I'll be headed
#14
Ragnar
#15
Nordschleife Master
the GT in 1990 was a 5 speed G28/55 equipped chassis with an M28/47 engine..... that was a standard GT.
Anything else would have been an option, which could likely be ordered on an S4 as well.
I think the above is concise yet complete.... am i really missing anything?
Anything else would have been an option, which could likely be ordered on an S4 as well.
I think the above is concise yet complete.... am i really missing anything?