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Springs
Posted by Jeff S. (more from Jeff S.) on Tue, 30 Jan 2001 09:15:38
In Reply to: Springs and Xenon Lights, George Wang, Tue, 30 Jan 2001 02:43:18
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If you really want to lower the Viggen I would only recommend Abbott (advertised 20% stiffer by Abbott, claimed 25-30% by ARM) or Swedish Dynamics (claimed 25% stiffer). I only have experience with the SD springs though. From what I have gathered, these two are the only ones that will defenitely give you a higher spring rate (when compared to the viggen's) in addition to the lowering. If you don't want better handling as well as a stiffer ride, due to the spring rate, don't bother to lower the car.
The SD springs lowered the front of my 900S about 0.75 inches. I calculated the front spring rate to be about 170 lbs/in which is about 25% stiffer than stock and more like 30% stiffer than the Viggen springs.
The rear springs lowered the car about 2 inches. Now the top of the fender is the same height front and rear. Based on my calculations/measurements, the rear spring rate is 475 lb/in (based primarily on the number of active coils). This is 96% stiffer than stock and 50% stiffer than Viggen rear springs. This seems a little too stiff, so if I added another 0.5 active coils the spring rate dropped to 360lb/in. This is 50% stiffer than stock and 15% stiffer than Viggen springs. This seems to be a pretty legitimate value based on how the car feels on the road.
The car has VERY little roll now. Also the car is much more neutral. Of coarse it will still understeer if you enter the corner wrong, i.e. too hot. Overall, I am very happy with the Swedish Dynamics springs. Maybe I will get another set of bumpers for the rear springs to rise them up a few millimeters.
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