964RS vs. 964 RSR shocks, discuss

[jpachard]

Hello All, What are the differences between the RS and RSR Bilstein shocks? Is it just valving?

I'm looking at getting a set of RSR shocks and want to make sure they will work on my car too, it's a 1993 C2 narrowbody.

Thanks, James

[Bill Verburg]

I don't know for sure but suspect that any difference in shocks would be in the valving.

AFAIK the canister shocks weren't introduced until the 993RSR and GT2EVO models came out

these are the 993RSR Bilstein cannister shocks

[group911@aol.co]

Bill
Would the RSR's have used 965 trailing arms instead of 964?
Seems like I remember the 965's using a different shock.

[trak ratt]

Went through this recently myself. The valving is different but the RSR shocks also have larger diameter shafts. Lots of info on the interwebs but here's the bilstein specs:

Model Application Body (Steel) Valving Rebound/Compression Part Number
PORSCHE RSR Insert S Cartridge Only 1610/1600 F4-RE3-5049-H0
Strut L S Threaded Body 1610/1600 K4-V36-58774H0
Strut R S Threaded Body 1610/1600 K4-V36-58773H0
Rear S Threaded Body 1800/1700 K4-BE5-59545H0

PORSCHE 964 RS 89-92 Strut L S Threaded Body 2590/840 F4-V36-0155-H0
89-92 Strut R S Threaded Body 2590/840 F4-V36-0156-H0
89-92 Rear S Threaded Body 415/237 F4-B46-1487-H0

[jpachard]

OK, thanks for al the help. I guess only one question remains and that is if the rears are indeed different. I will call Bilstein tomorrow and see.

Cheers, James

[Bill Verburg]

Originally Posted by group911@aol.co

Bill
Would the RSR's have used 965 trailing arms instead of 964?
Seems like I remember the 965's using a different shock.

I don't know for sure but suspect that the answer is yes. I do know that lots of guys that raced 965 and probably the 3.8RS too changed to the n/b arms so that they could use wider wheels

[J Richard]

Originally Posted by Bill Verburg

I don't know for sure but suspect that any difference in shocks would be in the valving.

AFAIK the canister shocks weren't introduced until the 993RSR and GT2EVO models came out

these are the 993RSR Bilstein cannister shocks

Bill I'm reporting you for posting porn.....

[1990C4S]

Are there different strut mounts? I believe the 964 and 964 Turbo have two different mounts, don't they?

[Bill Verburg]

Originally Posted by 1990C4S

Are there different strut mounts? I believe the 964 and 964 Turbo have two different mounts, don't they?

964 C2/4 and 964t all have the same rubber mounts, 964RS and RSR use monoball mounts and camber plates

there was a change in the street mounts for MY90 up

[trak ratt]

Originally Posted by 1990C4S

Are there different strut mounts? I believe the 964 and 964 Turbo have two different mounts, don't they?

As bill says same mount. But Turbo is reversed (illustrated in manual). Best to check if you remove if like me you draw out some projects!

[1990C4S]

I have to look again. I bought turbo shocks and springs for my 964 and the top portion of the shock was much different on the turbo version, shorter I think. I assumed I needed a new top mount. Are you saying I should have inverted the mount?

[Bill Verburg]

Originally Posted by 1990C4S

I have to look again. I bought turbo shocks and springs for my 964 and the top portion of the shock was much different on the turbo version, shorter I think. I assumed I needed a new top mount. Are you saying I should have inverted the mount?

here's the pic from the shop manual showing the difference between n/b and w/b
#1 is the n/b position #2 is the w/b position.


Cupcar posted the following info, in this thread
RS & Cup used monoball mounts
RS on left Cup on right



RS bilstein


Cup bilstein, note larger rod

[jpachard]

OK, I have confirmed that the RSR shocks will work on a narrowbody car. Now, what spring rates are folks running on these? This car will be eventually used for Club Racing but for right now I do need to drive it to the track although comfort is not important. Lastly, what size are the springs and who should I get them from Eibach?

Cheers, James

[Bill Verburg]

Originally Posted by jpachard

OK, I have confirmed that the RSR shocks will work on a narrowbody car. Now, what spring rates are folks running on these? This car will be eventually used for Club Racing but for right now I do need to drive it to the track although comfort is not important. Lastly, what size are the springs and who should I get them from Eibach?

Cheers, James

964 Cup sring rates 200-600#f 240-800#r

I know guys that run these rates on their dual use rides, but they have the advantage of adjustable shocks, Moton & JIC. It's very doable when the shocks are adjusted down a few notches

[FourDigits]

if you decide want to run 550# springs in the front, i have a pair of brand new in box eibachs for you.

fyi, take a look at the rear monoball mounts that bolt to the trailing arm. chances are they will be narrower and with a larger i.d. than stock. i had a cone/sleeve setup machined by jerry woods and all works well. good luck with the set-up!

[jpachard]

FourDigits, Sent you a pm on the springs.

James

[FourDigits]

pm returned....

[RSTarga]

I put the eibach euro springs on my turbo but since they are shorter they have torn up my bump rubbers. Is there a different shock for this setup? They dropped my ride height about an inch, handling is MUCH better. I can't remember the rates but I think they are a bit stiffer than the rs.

[tcsracing1]

i have a 1991 turbo.

looking to install 964RSR shocks.

Is this a direct bolt on?
I assume it will allow me to get lower?

[hockenheimr]

Bilstein Part numbers: