hi iam going for RSR coilovers on a 930

what spring rate sholud i chose?

what are yours corner weigts?


the car has about 600hp so i think i nead rather stiff in the rear
and i am going to use it on track and some street.

 

here is one picture of the car to make this more thread more fun

 

one more

 

Corner weights will vary, but there should be a certain percentage front to back. I just don't know enough. Contact Steve Weiner at Rennsport Systems. He should be able to help you with the coilover info and obtaining them.

http://www.rennsportsystems.com/~porsche/2a.html

Great car BTW!

 

Great looking car

My car is strictly a street car and my rates are 550 at the rear and 375 at the front.

 

i am thinking someting more like 800 lbs/in in front 1000lbs/in i rear

 

Yikes, hope you have a great Denist. Is this car for racing only?

 

IMHO not only is that a whole lotta spring rate for a vintage torsion bar based suspension (we're not talking modern multilink here right?) with the ratio biased so far to the front she'll be an understeering......

 

not for racing only a litle on street

my friends have
have a 964 with 600/800
and a 996 with 900/1250 lbs/in
and drive the cars on street and track
so i think we like stiff springs here in sweden


mabye 600/800 would doit on the 930 as well

do the 930 and 964 have the same MR?

 

Have you talked to Qvarnis? ( www.itsfun.nu )
He runs about 1000Hp in a 911SC chassie, dosn't he?
He should have a clue about reasonable ratios.

 

Don't use 996 rates as a guide to your vintage suspension. While the 964 is closer in design to our vintage 930's suspension it's still different enough to warrant different consideration.

The best solution for a street/track compromise probably is to go with helper springs to achieve a variable rate. This lets the suspension be compliant for the smaller bumps and undulations of street and rough track use. We used to leave the torsion bars in and add coilovers for dual purpose cars and it worked really well. Unfortunately torsion bars are such a pain in the @$$ to adjust.

You may find 800 lbs in the rear appropriate to handle the torque squat but 600 lbs in the front is too much IMHO. Depends also on what size tires/wheels you are running. I love the traction (especially @ turnin) of 275's up front but it's quite a workout on the forearms - especially with a smaller steering wheel & if you use a shortened steering rack you'll need to be Popeye. They seem to match well with 315+ rears.

No matter what you choose, do make sure you re-valve the shocks to control these high spring rates. I like higher than typical rebound rates myself.

 

we thinking of a RSR kit shoks and springs
and take away the torision bars

but to order this i thoth mabye some one here have experiance of spring rates that works fine

and what aprox corner weights do a 930 have at 1200kg

the car have 275/ 17" in front and 335/17" i rear

 

spjuvern,

I have an 87' 930 with ~600hp as well, weighing 3050 lbs., mostly track, some street.

I use 600/750 spring rates in coil overs. With minor adjustments to the anti-roll bars I've made it pretty neutral.

I tried the RSR Bilsteins (matching valving) but like the additional adjustability of the Fox units. It's not as much adjustment as Motons/JRZ's but also not nearly as expensive or hard to tune.
I also run 275/315 on 18's.

I hope that helps.

Good luck! i love your wheels!

Glenn

 

Spjuvern,

Has that car been in the hands of Staffan Kaiser?

 

I went with 600/800 on my Imagine Auto RSR coilovers that are on order.