[Fred Kiehl]

1/2 coil should give you 1 inch drop. Cut the tapered portion of the bump stops off to give you a little more suspension travel. Measure it before and after (center of the axle to the top of the wheel opening) and for every 1/2 inch of drop, remove 0.030 shim thickness from all stacks to compensate for negative camber change. You can get too low with springs, and run out of suspension travel. You may find that you will have to use smaller tires to keep from hitting the inside of the wheelhouse. You can remove the top bolt holding the wheelhouse to the fender to get a tiny bit of clearance. I went to a 215 tire 27 inches in diameter on the front and have no issues with the bolt removed. With the 27 inch tires you get another 1/2 inch of effective lowering (you may have to get 27 inch tires for the rear to make you ABS happy). I have drop spindles and springs with a 1/2 inch shim for about 3 1/4 inch total drop. The drop spindles moved my tires out about 3/8 of an inch. My car will go over almost all speed bumps and humps without hitting. I do have some issues with driveways, and parking lot entrances/exits. I also trimmed the airdam pieces about 1 1/2 inches so they do not drag on obstacles.

 

[Fred Kiehl]

Just joined here and seen your post and wanted to give my 2 cents of building movie cars for a living. Now I don't endorse this method or approve of it entirely. Do at your own risk , but what we do sometimes for a film shoot to lower the car without spending a heap of dough was to heat the springs on our bubble caprices. Another method was to order these spring clamps from JC whitney and it would compress the spring(2 on each spring) and you can tighten down on the various coils. And the final method which was mentioned was to cut a coil.
There is a impala on my website that we heated and cut the springs. You may check the pic on there but I must upload more soon.

Good luck.

Bad idea for a street car. Safety is the primary concern, and overheated springs are not safe. The heat takes the temper out of the metal, and it no longer has the qualities of a spring.

 

[Fred Kiehl]

Eibach lowering springs with 1/2 coil cut off the front ones

Do not rely on any speculation, measure it before and after installing the springs. Depending on the springs you currently have, you may be surprised at the amount of drop you get.