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FE Power Forums => Non-FE Discussion Forum => Topic started by: bsprowl on June 21, 2025, 12:46:36 AM

Title: Coil over rear suspension
Post by: bsprowl on June 21, 2025, 12:46:36 AM

My ’70 Maverick race car has a rear coil over conversion.  When I put it on the lift, the left rear spring is loose, about 11 inches long and right one is tight about 9-1/2 inches long.  They appear to be QA1 but I can’t locate a listing for the numbers on them.  The shocks are nonadjustable.

The front suspension is a straight axle using a pair of leaf springs.  Total weight was 1392 pounds without an engine, transmission, and accessories such as battery, gas tank, headers, etc.  I’m estimating 2300-2500 pounds total when the car is race ready.
 
I’ve never set up a coil over rear suspension.  I looked at several YouTube videos, but none of the videos address why one spring would be completely loose and the other tight.  I am guessing that the preload is correct on the right one add the left needs to be tightened. On leaf spring setups I use a extra leafs on the right and when I setup Air Lift Air bags, I put a higher pressure in the right air bag. 

Would setting length of the left one at about ¼ inch longer that the right be a good place to start?

Title: Re: Coil over rear suspension
Post by: hbstang on June 23, 2025, 06:03:13 PM

maybe the right one is longer to offset chassis roll on launch.kind of a preload.or maybe the driver weight was affecting the car stance.