[ordy]

Hello



I am running a 968 cs which had standard suspension, not MO30 stuff



I changed to leda adjustable shocks , and i am running 2.5 inch ID 275LBS 9 INCH Eibach front springs, i am finding the ride a bit hard for a normal road car, what is the normal spring rate?



Since i am changing a worm strut bearing, its my opertunity to change the springs, what LBS would you recomend?



All the torsion bars are standard.



Cheers



Simon

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[PorscheG96]

Normal spring rate is about 165#, so you can try something in the 200-225# range if the 275's are too stiff. Doing this will cause a bit more body roll under cornering and possibly change the chassis balance if you leave the rear rate the same.

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[stevekat]

Seems changing the front spring rate materially as you did, without a corresponding change to the rear spring rate (you mentioned the torsion bars are stock) likely modifies the dynamics of the car, unless your goal was toward a F/R spring rate bias in that direction. Did you add Leda units to the rear as well?

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[flash]

275 is not terribly stiff - i think it's likely a strut thing



are those struts adjustable? do they have separate compression and rebound?



if so, back off the compression setting - a high setting is what will make bumps feel harsh very quickly



it is very common for people to set their struts and shocks too stiff, thinking that it somehow firms up the suspension - all they are supposed to do is slow down the spring

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[ordy]

Hi



The leda struts are fitted front and rear, however the rear are non spring assisted, they are adjustable both rebound and compression however its one knob does both.



I have messed around with the adjustment loads, however i have it pretty soft now, they have 24 settings 1 being the softest and i have the fronts on 8 and the rears on 7 so i have neutral cornering.



If i take the rebound to less than 8 the ride goes very floaty and feels unstable if you hit a few bumps at speed, bounces around alot.



The roads here are very poor, pot holed and rutted, so that does not help.



Thanks for the spring rate advice, might go for a 200 lb setting i think from eibach, waiting for response of them.



Cheers



Simon

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[flash]

one knob does both? hmmm - you sure about that? - sounds like they are fixed compression and adjustable rebound, like the koni yellows

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[RS Barn]

The LEDAS have one knob that controls Compression and rebound at the same time. I find this odd since rebound is usually 2 to 3 times compression and changing in equally doesn't seem to be the right answer.

I think lowering the front spring rate to 225 and adjusting the LEDAS would help with harsh feel and still have adequate damping without the "Float"

Pete

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[ordy]

Yeah your right, one knob does both, thanks for the advice, think i will drop the spring rates to 200lbs or 225 llbs



Did the cs with non MO30 have the same rate springs i believe 165lbs, just a inch shorter than normal spec.?



Thanks



Simon

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[flash]

hmmm - i agree - very odd - that really limits spring choices, as the higher you go, the bigger the gap between settings on a street car



the book says the same 160# rate, but it appears to be a variable rate spring, so i'm not sure what they intended with the spec (nominal, initial, or final)

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[ordy]

Hi Flash



Thanks for the advice, one last question to anyone out there.



The spring length on the springs on the car are 9inch, however if i soften it to say 200lbs from 275lbs, would i have to go for a longer spring?, say 10 inch or 11 inch.



The standard spring is 13 inchs long.



Any info would be great.



Thanks



Simon

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[flash]

those struts are threaded with threaded lower perches, right? if so, just spin it up - in a 200# rate you are right in between, so i would use a 10" spring - any longer than that and you will end up with the perch nearly at the bottom of the threads

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[ordy]

Cheers Flash



Yeah your right they are adjustable for ride height, Eibach do 170lbs spring rate as well, would you purchase 10 inch in them if i went that way?



I have checked out the forum and the opinion is also that 200lbs ones will work with the standard rear set up, would you agree?



Thanks again for all the help



Simon

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[flash]

200 works pretty well with the standard rear rate - rustech has that in his car now, with M030 swaybars, and can give you specifics on how it feels



to determine what length, we really need to know what ride height you want - if you want stock height, you may need a 12 - pretty sure we went from a 12 to a 10 on his car, but he rides low - i'll check with him - it has been a while since i saw where the perch was with light springs like this, so i would need to verify the position



170 is pretty darned light - you would most probably need 12" springs for that - i think the car would ride pretty low on 10" at that rate, because i think the perch would be all the way to the top and still not be high enough

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[ordy]

Cheers Flash



I will check with eibach tomorrow on what is available, however if you can come back to me on what rustech has that would be great.



The ride height is standard 968cs height, as the rear has not been touched, what you are saying about a 12 inch spring for a 170lbs spring runs true, just measured my old 968 cs springs and they measure 12.5 inch.



I have sent a message to 968norway, as a while ago he was changing his spring rates and as Norway roads are like the uks, he may be able to advise as well.



Thanks Again



Simon

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[flash]

i was right - 10" 200lb - as low as he is, there is about a third of the threads left - at M030 ride height, you would have about a half inch left that you could raise the front end



at 170lb, it would be pretty iffy with a 10"

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[ordy]

Cheers Flash, i have ordered 175lbs Eibachs, should be here today, can use these as a starting point



Still awaiting my Kla strut bearing



Fingers crossed the car will handle well.



Simon

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[flash]

the 175 will feel just like stock

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[stevekat]

That is also my understanding, no or little change, other than any progressiveness that might have been in the stock spring.

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