wats the differents between Variable rate and reguler??? why does it matter if is manual, ac, non ac, auto?

 

Major options on the car like the A/C and tranny affect the weight and weight distribution of the car which affects the rate of the springs the factory installed in the car on the assembly line. The aftermarket uses this information to try to get you the closest match possible to the original springs.

Variable rate springs have a farily normal spring rate at normal ride height but tighten up quit a bit as they are compressed becuase of the way the springs are wound. Most of the time a standard spring will work just fine although a variable rate spring really won't feel much different under normal driving and with normal loads.

 

thanks, that helped alot!!

 

I went with the variable rate springs out back in my 89 RS, and I've been quite pleased with them. I used factory Iroc springs in the front, and I had the Iroc rear springs in for a while. The car actually rides and sits better with the var. springs compared to the Irocs in the rear. They're nice when you're hauling stuff too. I've put some pretty heavy stuff in the hatch area (trannys, engine blocks, etc.), and the car hardly drops at all. The codes on the factory Iroc springs I've got are BZW-front, and NNL-rear.