I got the car lowered on Friday with the Eibach Pro kit and don't like the ride now. The car is bumpy now and you feel every little imperfection on the road from cracks to dips to little bumps. Is this what everyone else experiences after lowering their cars? I still have the stock tires and wheels on it but know that when I put my wheels on next week that it's going to make it worse with the lower profile tires. I'm ready to put back in my stock springs and go back to stock because the car is so smooth stock and this makes the car feel like a civic with cut springs in it or something.

 

are you on the stock shocks/struts?

 

are you sure you got the prokit? it doesn't sound like anything I have experienced with the Eibach even with my 20's.

Who did the install for you? and where did you get the springs? do you have the RWD or the X sedan?

 

i'll take the pro-kits off ur hand if u're gonna sell them

 

Yep, stock struts. I was told by mutliple places (Stillen, Ground Control, etc.) that I could use the stock struts with these springs since they are not that aggressive. I was thinking that maybe this could be contributing to the bumpiness.

 

yes. I have the box that they came in which now has my stock springs in it and it's the pro kit box.

I had it installed at Extreme Motorsports in Brentwood, he ordered them for me. Car is RWD.

 

stay tuned.

 

I did the Eibach Prokit and 225/45/18 at the same time on my sedan. The ride is significantly more firm, but not harsh IMO. Im assuming they re-aligned both ends of the car? If not, you are going to have drift and feel every taper in the road because the wheels are not tracking right. My car was barely in camber spec after the drop. Any more and a camber kit would have been required.

 

well if you got the prokit, then either all 4 springs are defective or the installation is not right.

I've gone through a few sets of the prokit in different cars including my G, and I've never had a problem like you're describing.

 

I have the same springs there great. not really that bumpy and im on 20's. only thing is that sometimes you hear like a pop or just a noise here and there.

 

I got an alignment at the same time. The car drives straight no problem and tracks well. Just bumpy and stiff. I got 19's on the way and it's just going to add to the harshness with the 35/30 series tires.

 

I don't know how they could mess up the installation, it's not that hard to swap out springs in cars as long as you have the proper tools. I've always lowered my own in the past but don't have the time nor the proper tools right now.

 

Sounds like you need to verify the part #'s stenciled on each spring. Some moron might have restocked a returned set in the wrong box, or they swapped the front/rear during install. Something is not right thats for sure because the Prokit is not that stiff. Once you write down the # from each spring, I would call Eibach and have them verify the proper springs are on your car and in the proper corners.

 

I wish I could drive your car to see if it is just you or in fact they are too harsh. Or if you could drive another prokit G to compare it to yours. Remember--there will be a price to look good. I am preparing myself too. As prokit and stag.19"s are in my near future.

 

clos75,

How many miles do you have on your stock struts? If you are say over 30K miles, adding stiffer rate lowering springs could result in what you are describing. What's happening is your strut has lost a significant amt of compression and rebound damping force so it cannot resist the higher spring rate which results in a bouncier ride. Additionally, with the reduced ride height and weaker compression damping from higher mileage struts, your car would be more prone to bottoming out which would cause the harsh feeling ride quality.

I'm not too familiar with G35 suspensions, but another issue could be if the car was lowered w/o cutting the bumpstops. Typically, when you lower a car, you want to cut the bumpstops to get a little bit of suspension travel back. I'm not sure if the G35 suspension has bumpstops that can be trimmed, but this could also be a source for your harsh ride quality.

Bottom line - get some high performance shocks to pair w/ your lowering springs to cure the problem.