Club Cobra - Front and Rear Spring Rates

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Front and Rear Spring Rates

Discussion Tools

12-31-2013 06:05 AM - permalink

RedEye

Hi Guys, I know our cars (Streetbeast) tend to have a bit thicker fiberglass than other makes and are consequently slightly heaver than FFR or ERA model of same proportions. I currently have 550LB springs on the front and 375LB springs on the rear (Live axel, 90 degree spring angle). Tires are 245 front and 315 rear, 17". I'm getting some rubbing, especially with instances of two full size riders and have consequently been forced to raise the car in the rear so that the stance of the car appears rear high or otherwise incorrect. I have QA1 coil overs, 12" rear shocks. My goal is to lower the rear of the car about 1.25-1.75" with similar drive (abit a bit firmer bounce) I'm thinking about increasing the rear spring rate to either 450 or 500LB and and possibly shorting to a 10" spring so that I don't have the spring resting on the very bottom of the shock case. Thoughts welcome, what do are your springs rates?

01-06-2014 06:21 AM - permalink

mdross1

I remember playing with spring rates on our car and 500lbs rings a bell. Just too many years ago.Like me you will find the right number.

01-06-2014 06:27 PM - permalink

RedEye

Hey Thanks. I don't want to over do it and prevent any mass from putting pressure on the rear axle during hard accelerations but on the other hand, I want to lower the body a bit do it looks correct as well.

01-07-2014 12:10 PM - permalink

KSC- Cobra

Since we are still in the initial building stage we have been assembling our car as close to the manual as possible. We used the stock springs from a Fox Mustang donor car. I do not know what the spring rates are but I have 1.75 inches of clearance above the rear tires (to the body) and 3" in the front and the suspension is very firm.

01-07-2014 10:32 PM - permalink

RedEye

From a bit of Google, it appears that the Fox mustangs had a fairly light spring rate in the rear, sometimes as low as 175lb. I started with 275lbs, and with proper adjustment and two full size male passengers it could't keep the body off the tires. I moved up to 375# which gives a very nice ride and good hookup but again, when I have two adult passengers the Michigan roads tend to cause points of rubbing. Also, to keep the 375s from rubbing, I had to raise the rear body another .75-1" away from the axle with adjustable coil over shocks. So now, I would like to get my 1" (or maybe even 1.5-1.75") back so the stance of the car appears more correct, yet find that nice spot between taking an oversized friend for a ride, and not breaking my tailbone.

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