Thread: Estimating rear spring weight.
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Old 08-13-2008, 12:04 PM
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donraye donraye is offline
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Cobra Make, Engine: Street Beast "Grabber Orange"/Silver stripe w/418W 520HP full roller, T5. and: Backdraft #814 RT3B "Black Label" "Magic Black"/Sterling Grey stripe, 408W, full roller, 475HP, T5
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Quote:
Originally Posted by FST HSKR View Post
Don,

I am running 300 on the back of mine. It will ride a little rough. Took a lot of the push out of the car by raising the front end, then adjusting each of the ones on the rear. It won't take long and you will feel the difference not only front to back but side to side. Good luck.

Jim
Quote:
Originally Posted by Tim Brewer View Post
That's what I'm saying.. it IS 300 each that you want. When anyone is talking of spring rate, they are talking about the rate of one spring only, never of one multiplied by two.
Quote:
Originally Posted by Tim Brewer View Post
Are you sure you have 150# springs? You'll need at least 250#'s and probably heavier. With 150's you'll bottom on every dip in the road. Don't rack your brain trying figure and factor everything. It's better to be a little stiff, than too soft. I just ordered 300's for my car.
Quote:
Originally Posted by cdnus View Post
I have a 8.8 with the coilovers mounted outboard of the frame---about as far out as I could get them & still run a 295 tire. Started with 250# & they were too soft, I am at
275's now & they seem to be perfect for my use. Steet only with some spirited 0-60's.
If you are mounting them in the original location on the stock lower control arms I have no idea where you would start.

Craig
Now I am totally confused. I got my spring weights from this spring weight application chart on the "Competition Engineering" web site
No. Description/Application
C2550 Spring Rate: 85 lbs/in., Total Weight on Rear Wheels: under 1050 lbs.
C2555 Spring Rate: 100 lbs/in., Total Weight on Rear Wheels: 1050 -1150 lbs.
C2560 Spring Rate: 125 lbs/in., Total Weight on Rear Wheels: 1150 - 1250 lbs.
C2565 Spring Rate: 150 lbs/in., Total Weight on Rear Wheels: 1250 - 1450 lbs.
C2570 Spring Rate: 200 lbs/in., Total Weight on Rear Wheels: 1450 - 1800 lbs.
Are these weights all wrong or ?
Are you guys saying I need to double these spring weights to be in the correct range. Which would mean I probably need a pair of 250-300 lb springs?
Please help clarify this if you would.
Thanks, Don
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