question about rear spring rates
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question about rear spring rates
Hey guys. I was hoping to get some help with this...
I noticed from gsedan35's sticky that most aftermarket springs have higher spring rates for the rear. But, most coilovers have equal or lower rates in the rear. Would this be due to the location of the spring? -located on spring perch as opposed to mounted on the shock.
Also, give me your opinions about what the ideal setup would be... spring rates for front and rear with the springs mounted in the stock perch location (if this makes a difference), regardless of shock valving and ride height. -progressive or linear? -track or street or both?
Thanks.
I noticed from gsedan35's sticky that most aftermarket springs have higher spring rates for the rear. But, most coilovers have equal or lower rates in the rear. Would this be due to the location of the spring? -located on spring perch as opposed to mounted on the shock.
Also, give me your opinions about what the ideal setup would be... spring rates for front and rear with the springs mounted in the stock perch location (if this makes a difference), regardless of shock valving and ride height. -progressive or linear? -track or street or both?
Thanks.
#4
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You must convert the spring rate to the actual wheel rate, which involves correcting for angle of mounting and where the spring center fits in relation to the distance from the wheel center along the lower suspension arm.
If a spring sits [mounts] midways [exact midpoint] in an arm its true wheel rate is 1/4 of the published rate. You use the SIN of the angle to correct the angular force. ALSO any rubber mounts and bushings plus the tire side wall stiffness must be added to the equation to derive actual road rate.
In reality most cars have a true road rate equal to the ratio of vehicle weight that allows a +- 3.00" shock travel.
If the car has a 54% front static weight the front springs are 54/46= 1.174 or 15-20% stiffer than the rear springs when measured at the tire/road interface.
The exact ratio depends on the wheel base and tuning speed to optimize the time between a road bump so that the body doesn't undulate and pitch on interstate.
If a spring sits [mounts] midways [exact midpoint] in an arm its true wheel rate is 1/4 of the published rate. You use the SIN of the angle to correct the angular force. ALSO any rubber mounts and bushings plus the tire side wall stiffness must be added to the equation to derive actual road rate.
In reality most cars have a true road rate equal to the ratio of vehicle weight that allows a +- 3.00" shock travel.
If the car has a 54% front static weight the front springs are 54/46= 1.174 or 15-20% stiffer than the rear springs when measured at the tire/road interface.
The exact ratio depends on the wheel base and tuning speed to optimize the time between a road bump so that the body doesn't undulate and pitch on interstate.
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SFLG35, dont worry about him... hes just messin around...
-yea I know its all about personal preference for your suspension setup. I heard about something new that may be coming out soon and was curious of other peoples opinions on a good setup.
JJ, my spring rates suck? your car looks like its ready for offroading! If you still want my springs... I may be changing out my suspension soon.
Q45tech, thanks. Although it did not answer my question exactly, I always appreciate info that can help me understand my suspension as a whole.
-yea I know its all about personal preference for your suspension setup. I heard about something new that may be coming out soon and was curious of other peoples opinions on a good setup.
JJ, my spring rates suck? your car looks like its ready for offroading! If you still want my springs... I may be changing out my suspension soon.
Q45tech, thanks. Although it did not answer my question exactly, I always appreciate info that can help me understand my suspension as a whole.
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Originally Posted by johnjayb
yo chris. im dropped on an eibach pro kit now. its gonna hold me down temporarily. haha
as for the comment i made up there... i was drunk. and bored. and wanted to post some stupid witty comment. lol
as for the comment i made up there... i was drunk. and bored. and wanted to post some stupid witty comment. lol
Witty? You wish.
I dont know why your car was so high, but with your eiback springs, I bet it looks like its at stock height now! lol!
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