I'm about to trim the moog IROC coils in my 84. Does anybody have a reccomendation for how much to cut? They have been in for several years so they are settled. I'm thinking about 1 coil. I know i should be conservative and cut slowly but i don't have time or space to be really ****. I'm looking for about 1-1.5 inches in the front, the rears are easy enough, i'll do those a little at a time.

 

I havent messed with those, but I've cut a few stock springs down. You cut a coil off the front and more than likely you are going to be sitting on the bumpstops. I'd go 1/2.

 

Let us know how it works out, I put those same springs in not too long ago.

 

i'm hoping to get it done this weekend, but as usual its not going so well. I'm working on reinforcing some control arms, which need to be completed for the spring trimming. unfortunately a torn rotator cuff and tendonitis is acting up and cutting, welding and wrestling with springs dosen't help the situation

 

If they are in the car right now, then take a measurement of how high one full coil length is in hweight with the spring compressed.

The coil is aprox 42% on leverage point of the A-arm at spring centerpoint. What this means is for ever .42" you cut, you will get 1 full inch of overall drop. Basically cut off about 1/2" of compressed height coil.

This is not an exact science formula, but very very close. The cut coil does become slightly stiffer so actually cutting .42" MAY only drop it .95" instead of a full 1.0"- you get my drift.

cutting off a 1'2 of compressed hieght may be more like 3/4-7/8" free height- this is why you need to measure one full coil loop at compressed height. Then when you remove the coil and it has expanded, you will have an idea of how low each full coil taken off will make the car drop.