Porsche RS spring rates?
01-28-2008 | 12:25 PM
#1
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From: Long Island N.Y
Porsche RS spring rates?
Would anyone know what the spring rates are for Porsche RS coil springs? Also would this be an ideal spring rate for a car that will see double duty as a track/street car?
Thanks,
Dan
Thanks,
Dan
01-28-2008 | 12:43 PM
#2
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From: NY, USA
I've saved the following from another (multiple other?) posts here on Rennlist:
Code:
Spring rates
. Front Rear
Standard US Suspension 150-200 lbs/inch 225-275 lbs/inch
Factory M030 150-200 225-275
Eibach 964 Pro-kit springs 182-250 188-256
Eibach 7209 120 200
H&R 964 springs 190-255 220-265
H&R 965 (Turbo) springs 250-270 265-285
H&R 964 Coil-over 250-285 265-285
H&R Coilovers 290-310 350-370
H&R 964 Super Cup 455 685
H&R Peformance 240-260 280-310
Porsche Carrera RS springs 250-308 375-508
PSS9 225-250 400-685
Weltmeister 180 268
01-28-2008 | 12:44 PM
#3
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From: NY, USA
I've saved the following from another (multiple other?) posts here on Rennlist:
On review I don't see the "RS" rates called out; sorry!
Code:
Spring rates
. Front Rear
Standard US Suspension 150-200 lbs/inch 225-275 lbs/inch
Factory M030 150-200 225-275
Eibach 964 Pro-kit springs 182-250 188-256
Eibach 7209 120 200
H&R 964 springs 190-255 220-265
H&R 965 (Turbo) springs 250-270 265-285
H&R 964 Coil-over 250-285 265-285
H&R Coilovers 290-310 350-370
H&R 964 Super Cup 455 685
H&R Peformance 240-260 280-310
Porsche Carrera RS springs 250-308 375-508
PSS9 225-250 400-685
Weltmeister 180 268
01-28-2008 | 12:58 PM
#4
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They're there--see Porsche Carrera RS. Good work! 
As to whether they're ideal for a dual purpose car? That's hard to say. I had these on my car coupled with the Bilstein RS shocks and it's a very stiff ride. Not jarring but very little float.
I've also driven my car around town with adjustable shocks and heavier linear springs and felt the ride was much more comfortable. By softening the shocks, you can dial in just the right amount of float and not lose your latte/fillings/earpiece over speed bumps.
So I guess it also depends on which shocks you plan to use, Dan, and what sort of ride you can tolerate around town?
As to whether they're ideal for a dual purpose car? That's hard to say. I had these on my car coupled with the Bilstein RS shocks and it's a very stiff ride. Not jarring but very little float.
I've also driven my car around town with adjustable shocks and heavier linear springs and felt the ride was much more comfortable. By softening the shocks, you can dial in just the right amount of float and not lose your latte/fillings/earpiece over speed bumps.
So I guess it also depends on which shocks you plan to use, Dan, and what sort of ride you can tolerate around town?
01-28-2008 | 01:03 PM
#5
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From: New Jersey
I've saved the following from another (multiple other?) posts here on Rennlist:
Code:
Spring rates
. Front Rear
Standard US Suspension 150-200 lbs/inch 225-275 lbs/inch
Factory M030 150-200 225-275
Eibach 964 Pro-kit springs 182-250 188-256
Eibach 7209 120 200
H&R 964 springs 190-255 220-265
H&R 965 (Turbo) springs 250-270 265-285
H&R 964 Coil-over 250-285 265-285
H&R Coilovers 290-310 350-370
H&R 964 Super Cup 455 685
H&R Peformance 240-260 280-310
Porsche Carrera RS springs 250-308 375-508
PSS9 225-250 400-685
Weltmeister 180 268
As for this list... I've owned a 996 and 993 with the Super Cup level rate (455/685) and thought they were great on a car over 3000 pounds. For me, fine for the street and great for the track. I realize, some my think too harsh for the street. My car is strictly a toy and street time is also play time.
-h_d
01-28-2008 | 01:27 PM
#7
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From: St. Albert, Alberta, Canada
Mine supposedly has M030 springs but on reviewing the list I wonder if they are something else aftermarket. They list as having the same rate as stock yet they are very much stiffer (the springs that is 
) than a friends 964. Mind you his is a cabrio - did they have a cabrio comfort spring?
) than a friends 964. Mind you his is a cabrio - did they have a cabrio comfort spring?
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01-28-2008 | 01:34 PM
#8
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From: Highland Park, IL (Chicagoland)
Yeah I am confused too Dave. I was under the impression that in the US the M030 is the RSA. I have read that RSA models had the same ride height as stock US C2's... is the M030 option have different dampers with the same springs as stock? Does the M030 option have a different spring set up on ROW models?
01-28-2008 | 02:29 PM
#10
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From: NY, USA
I've found another reference with different rates. I suspect my original data!
https://rennlist.com/forums/showthre...ht=spring+rate
https://rennlist.com/forums/showthre...ht=spring+rate
01-29-2008 | 12:01 AM
#11
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From: Long Island N.Y
dfinnegan,wow thanks so much for sharing your compiled list of spring rates. Takes the voodoo out of making spring choices and makes it a lot clearer.
Joey.B, thanks again for your input. I understand what you mean by floating.I just sold my white SC DE/street car with 21/28 TB's.A nice compromise from the original 23/30 TB's. The 23/30's just wore on me after a hour of street duty.I'm still seeing my dentist.I'd love to get the JIC's but they are presently out of my budget.Some people believe the Bilstein HD's are not up to the stiffer spring rates even after revalving? I don't know how much truth there is to this?
Thanks again everyone,
Dan
Joey.B, thanks again for your input. I understand what you mean by floating.I just sold my white SC DE/street car with 21/28 TB's.A nice compromise from the original 23/30 TB's. The 23/30's just wore on me after a hour of street duty.I'm still seeing my dentist.I'd love to get the JIC's but they are presently out of my budget.Some people believe the Bilstein HD's are not up to the stiffer spring rates even after revalving? I don't know how much truth there is to this?
Thanks again everyone,
Dan
01-29-2008 | 12:36 AM
#12
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From: Highland Park, IL
Dan,
I guess if you don't valve the shocks to RS specs, you'll end up with a decent ride. But what values would you use? Also, while the RS coilovers may be a little tight for daily use, they're still a little soft for track use. It's truly a compromise in both instances.
I'd recommend you get a ride with someone who has aftermarket coilovers in their 964, if at all possible. Maybe you'll get a better idea as to what's doable. I've tried the H&R 964 springs with Bilstein HD's and that's a pleasant ride, as well, and not bad for the occasional track outing.
$0.02
I guess if you don't valve the shocks to RS specs, you'll end up with a decent ride. But what values would you use? Also, while the RS coilovers may be a little tight for daily use, they're still a little soft for track use. It's truly a compromise in both instances.
I'd recommend you get a ride with someone who has aftermarket coilovers in their 964, if at all possible. Maybe you'll get a better idea as to what's doable. I've tried the H&R 964 springs with Bilstein HD's and that's a pleasant ride, as well, and not bad for the occasional track outing.
$0.02
01-29-2008 | 10:30 AM
#13
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Joey, it seems you've tried your share of suspensions before you ended up with dedicated track suspension. Truthfully my car will be more street than track. Your right what can I live with? I'll wait and see if I can get some rides as suggested. The RS spec'd suspension might be a tad too much for my application or needs. Compromise sucks. The adjustable suspension like JIC seems like the ideal compromise though. When you tally in mono ***** with the HD Bilsteins your that much closer in costs for the JIC's. What setup do you now have in your car?
As usual thanks for your input on your experience in what you've used. I have a lot more to think about with the info. provided to make a better decision.
Dan
As usual thanks for your input on your experience in what you've used. I have a lot more to think about with the info. provided to make a better decision.
Dan
01-29-2008 | 11:45 AM
#14
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I have the JIC's with approx 500/700 springs. It's on the soft end for track work but with the adjustable shocks, I can get it to stick pretty good. And if I ever drive it to the shop, softening them up makes for an amazingly comfy ride. With the camber plates, it's a pretty nice deal for less than $3K.
If you can wait it out, I'd go with this set up. You're right, it's not that much more than shocks, spring and monoballs and doing it once will save you the cost of an additional alignment and corner balance.
If you can wait it out, I'd go with this set up. You're right, it's not that much more than shocks, spring and monoballs and doing it once will save you the cost of an additional alignment and corner balance.