Does anyone have any experience with the ISC racing rear adjustable coil setup? I just got down with my GC install and the drop was far more than I anticipated. I want to put on a rear coil setup where I can raise or drop the height from stock to 2". I'm also debating just going with the Racing Beat rear springs and losing the Eibach ones I have now.

 

I have both the GC coilovers on the front and the ISC adjustables on the back... No complaints! They work well, and do what they are supposed to do.. Just becareful when u lower the car of the jack as the springs and the perch do not always line up and you'll hear a big bang when it slides into place.

 

What kind of ride height adjustment can you do?

 

At a minimum, the height will at least raise the rear up the thickness of the adjusting flange which is 1/2". You'll also need springs that fit these adjusters - IIRC they require 5"ID springs. Not too long ago there was a discussion on these, maybe you can do a search and get better info from that thread.

 

I'm confused. Do these coil overs (Ground Control or ISC(?)) require modification to use or do they mount in stock locations like most other cars? I thought I just read a thread on the front page yesterday about our cars not being able to support the weight in the rear when using coil overs and that really bummed me out.

So, can we use GC or ISC straight up, no additional bracing, welding, and so forth?
If so, how much for a kit, what model are you using, what did it cost, and give me that number. =)

I'm not really interested in the huge drop so much as I am interested in adjusting the height to the exact level I want over the wheel.

 

the adjustable rears that are being talked about are not a coil over suspension, they are, however, adjustable. It has been common now a days to exchange the word "coil over" for any height adjustable susspension, where as a true "coil over" is denoted by the the strut/shock being located in the inside of the spring. A great example of that would be the front suspension set-up on our cars. So to answer your question... no our csars cannot run a true coil-over set-up in the rear because the shock mounts are not strong enough and would shear off, BUT we can however use the ISC set up because it is an adjustable lower spring perch and allows height adjustment... here's the link to there page.... http://www.iscracing.net/

 

There are a few coilover's for the front but only ISC racing makes a special coil adjustable setup for the back. Most kits require welding. I had a local machine shop lathe off the old perches and weld in new ones for $60.

 

The ISC Rear is a threaded spring perch. You drop ontop of the spring, works great, no complaints. Cadium plated too.

 

About how much adjustability do you get, ~2"?

 

Jason, I have ISC Racing stuff & the inside diameter of the spring is 4 inches, the wire diameter with paint is .475 inch diameter (I have 150 pound springs at the rear), the spring free length is 8 inches, the adjuster is 1/2 inch thick, you can adjust 2 1/2 inch above the overall short length. The short length would be the 1/2 inch thick adjuster thickness plus the compressed length after the car weight is on the 8 inch free length spring. Then you may adjust the car up 2 1/2 inches. Pull your old springs out, insert your new adjuster with spring. Nothing required to fab or weld. Note to all, when you start lowering your car you change the angle between the trans shaft centerline versus the driveshaft centerline & you change the angle between the driiveshaft centerline & the differential centerline. At the moment I don't remember the ideal for the angles. Do a search for driveshaft versus differential angle in Google & you should find some info. Now you say, why do I say the angles need to be within certain specs. It's because if the angles are not to these specs you will wear out the rear bushing in the tail end of your transmission along with the outside diameter of the splined portion of the driveshaft.

 

Now that is some good information...