Spring rates?
08-24-2002, 04:39 PM
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Racer
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Join Date: Jun 2001
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Spring rates?
Edit: placed on the 964 board by mistake 
, was waiting to happen though, I visit this board just as much, and what rates do 964's have? Nol
When researching shock replacement options and supsension upgrades on Gert's site I noticed that very different combinations of spring rates are used by the H&R and PSS-9 setups:
H&R : Front: 290-310
Rear: 350-370.
PSS9: Front: 225 - 250 lbs
Rear: 400 - 685 lbs
Notice how the popular PSS9 has a much bigger difference in spring rate front to rear. Softer in the front and much stiffer in the rear compared to H&R.
I know the damping rates are important too but this stiffening of the rear end must make a big difference to the handling of the PSS-9 equiped cars. Anyone noticed this from "seat of the pants" feeling of their car before & after? Would it help to reduce understeer for my C4?
The standard US suspension is 150-200 front and 225-275 rear according Gert's site, but I can't find the ROW M030 values. Can someone chime in with these?
For now I'm leaning towards replacement with Bilstein HD shocks or Gert's Bilstein HD "package" with ROW M030 depending on the spring rates. I can't see the need (yet?) for the adjustable features of the full PSS-9/RSbar set-up on my street ride. But I am more than curious about the stiff rear end and what it could bring.
Enjoy <img src="graemlins/burnout.gif" border="0" alt="[burnout]" />
Nol,
RLM#: 020825-2307
PS: On setting up full suspension mountainbikes I take care to balance the suspension components in rate and feel for front and rear to get a decent handling rig. The actual spring rates you end up with depend a lot on suspension geometry. But once that is sorted you can't just "up" them by a couple of 100 lbs on one end and not notice a huge difference. I do assume the same applies to cars, right?
PPS: this could be "the" difference we're all looking for of course!
, was waiting to happen though, I visit this board just as much, and what rates do 964's have? NolWhen researching shock replacement options and supsension upgrades on Gert's site I noticed that very different combinations of spring rates are used by the H&R and PSS-9 setups:
H&R : Front: 290-310
Rear: 350-370.
PSS9: Front: 225 - 250 lbs
Rear: 400 - 685 lbs
Notice how the popular PSS9 has a much bigger difference in spring rate front to rear. Softer in the front and much stiffer in the rear compared to H&R.
I know the damping rates are important too but this stiffening of the rear end must make a big difference to the handling of the PSS-9 equiped cars. Anyone noticed this from "seat of the pants" feeling of their car before & after? Would it help to reduce understeer for my C4?
The standard US suspension is 150-200 front and 225-275 rear according Gert's site, but I can't find the ROW M030 values. Can someone chime in with these?
For now I'm leaning towards replacement with Bilstein HD shocks or Gert's Bilstein HD "package" with ROW M030 depending on the spring rates. I can't see the need (yet?) for the adjustable features of the full PSS-9/RSbar set-up on my street ride. But I am more than curious about the stiff rear end and what it could bring.
Enjoy <img src="graemlins/burnout.gif" border="0" alt="[burnout]" />
Nol,
RLM#: 020825-2307
PS: On setting up full suspension mountainbikes I take care to balance the suspension components in rate and feel for front and rear to get a decent handling rig. The actual spring rates you end up with depend a lot on suspension geometry. But once that is sorted you can't just "up" them by a couple of 100 lbs on one end and not notice a huge difference. I do assume the same applies to cars, right?
PPS: this could be "the" difference we're all looking for of course!
