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control arms and spring rates

what effect does it have on the control arms as you increase the coil spring rates?

Dave
86 944na
Old 07-12-2004, 08:57 PM
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rates don't matter much, ride height does
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Old 07-12-2004, 09:03 PM
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Stiffer springs are usually shorter, thus the change in ride height. There are several 'kits' that have an adjustable spring perch. However, many of these still result in about a 1" drop in the front end, even with the perch adjusted up all the way.

FWIW...original springs on the front were about 165 lb. Many AutoX change to 200 - 250 lb springs. Not to much difference in normal street driving, but does reduce nose dive on the track. Racer's change to 400 - 600 lb. springs, which are to stiff for street application.

The contrl arm is usually not effected untill you combine very stiff race springs and bigger anti-sway bars. I have seen one of the 944Cup cars snap the A-Arm at the pivot point on the cross member...but they had BIG springs and BIG sway bars.

Good luck.
JM

Last edited by JRMock; 07-13-2004 at 04:19 AM..
Old 07-13-2004, 04:11 AM
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Quote:
Originally posted by JRMock
Stiffer springs are usually shorter, thus the change in ride height. There are several 'kits' that have an adjustable spring perch. However, many of these still result in about a 1" drop in the front end, even with the perch adjusted up all the way.

FWIW...original springs on the front were about 165 lb. Many AutoX change to 200 - 250 lb springs. Not to much difference in normal street driving, but does reduce nose dive on the track. Racer's change to 400 - 600 lb. springs, which are to stiff for street application.

The contrl arm is usually not effected untill you combine very stiff race springs and bigger anti-sway bars. I have seen one of the 944Cup cars snap the A-Arm at the pivot point on the cross member...but they had BIG springs and BIG sway bars.

Good luck.
JM
I must respectfully disagree on the point about 400lbs being too stiff for the street. That is the rate that I am running and it is not bad at all, there is not much of a ride quality change from the 250 to the 400.

If you lower the car, you have less of a chance of messing up the a-arm if you increase the spring rate. If you lower the car and leave the stock springs in there, there is more of a chance of the ball-joint smacking the outside of the aluminum socket and breaking it out.

Just some observations from personal experience.
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Old 07-13-2004, 06:24 AM
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