Hi guys, I did a lot of looking online for installation info for Eibach Pro-Kit springs without a lot of luck, and had to do it by trial and error. Here's what I found, hope this helps somebody....
I've only done the rears so far to try to reduce hop. I have Koni Sport adjustable shocks which helped some. The Pro-Kit rear springs are the same height as the stock coupe springs before installation. I also installed Maximum Motorsports urethane upper and lower isolators with the Eibachs. With this combo, it only lowered the rear by 3/16" on one side and 3/8" on the other (Eibach's website claims 1.4" rear drop.) Turns out the springs are wider than stock and are hanging up on a sheet metal body panel that hides the upper spring perch. Gonna have to try to bend the panel out or maybe re-seat the springs.
Trying to compress the springs enough with an internal compressor is nearly impossible because the compressor stud sticks out of the top of the spring too far. Here's how I ended up installing them, could have done both sides in about 2 hours had I done it this way in the first place:
Get the back of the car on jack stands and remove the wheels. Remove the 10mm bolt holding the ABS line plate and pull the plate away from the body. Remove the 18mm lower shock bolts. Put a jack under the DIFFERENTIAL and jack it up till it touches the diff. Remove the 18mm bolts (1 per side) that hold the IRS subframe to the body. Remove the (2) 10mm bolts that hold the exhaust tips to the body. Now slowly lower the jack under the diff and the whole subframe will drop. You can just lift the stock springs out of the perches and set the Eibachs in place, no compressor or prybars (both dangerous) needed! Hope I didn't mess anything up doing this but it seems to run great. The Eibach did help and combined with the shocks the hop is much less, can still spin the wheels so not a lot of shock to the drivetrain. Didn't mess with any IRS bushings and frankly don't see how much they could possibly help, I want a road-course car, not just a straight-line car. Ride is not much stiffer than stock. Hope this helps!
I've only done the rears so far to try to reduce hop. I have Koni Sport adjustable shocks which helped some. The Pro-Kit rear springs are the same height as the stock coupe springs before installation. I also installed Maximum Motorsports urethane upper and lower isolators with the Eibachs. With this combo, it only lowered the rear by 3/16" on one side and 3/8" on the other (Eibach's website claims 1.4" rear drop.) Turns out the springs are wider than stock and are hanging up on a sheet metal body panel that hides the upper spring perch. Gonna have to try to bend the panel out or maybe re-seat the springs.
Trying to compress the springs enough with an internal compressor is nearly impossible because the compressor stud sticks out of the top of the spring too far. Here's how I ended up installing them, could have done both sides in about 2 hours had I done it this way in the first place:
Get the back of the car on jack stands and remove the wheels. Remove the 10mm bolt holding the ABS line plate and pull the plate away from the body. Remove the 18mm lower shock bolts. Put a jack under the DIFFERENTIAL and jack it up till it touches the diff. Remove the 18mm bolts (1 per side) that hold the IRS subframe to the body. Remove the (2) 10mm bolts that hold the exhaust tips to the body. Now slowly lower the jack under the diff and the whole subframe will drop. You can just lift the stock springs out of the perches and set the Eibachs in place, no compressor or prybars (both dangerous) needed! Hope I didn't mess anything up doing this but it seems to run great. The Eibach did help and combined with the shocks the hop is much less, can still spin the wheels so not a lot of shock to the drivetrain. Didn't mess with any IRS bushings and frankly don't see how much they could possibly help, I want a road-course car, not just a straight-line car. Ride is not much stiffer than stock. Hope this helps!