Took off the springs tonight. It was written 325 on the end coild on them. They measured 9" unloaded.
With the suspension in correct position, they are app 7" but not stiff enough to hold the car. They compress further down to app 6" before they stop.
QA1 don't make 9" coilover springs at all, so I guess they have been 10" from the start, and have sagged 1" during the time the car has been a roller?
I contaced Speedway and Heidt's and asked what they recommend of Mustang II suspension on my car (Fat Man where I bought the kit from, won't tell. They suggested somewhere between 450 and 500 lbs...)
Speedway suggested 375 lbs.
Heidt's suggested 425 lbs.
In both requests I pointed out that it was a Mustang II suspension, Not a rear steer IFS, as those usually have slightly angled springs.
Maybe a pair of 10" 400 lbs springs?
Last edited by staleg; 11-26-2012 at 03:19 PM.