Eibach prokit lowering springs problem..
 

Hey,

Has anyone had any problems with lowering springs in 370Z?

Couple of weeks ago local workshop installed springs to my Zed and there are differences in height, especially drivers side and near side of the car. :shakes head:

Example: (measured from center of the wheel hub to wheel arch)

Front left 345mm
Front right 335mm
Rears 355mm

Eibach reports that it should be about 360mm at front and 357mm at rear. So what actually can cause problem like this? Problems of the hardening of springs? Defect product? I also remember that i have read that someone else had experienced that these springs lower more than eibach informs.

Local shop who did install job did everything right (at my opinion) , as i was watching the install whole time.. Springs are in right position in lower mount (cup) of shock and everything looks ok. And yes i have double checked codes and they are right in springs and in package..

I suppose that shock struts can not be installed incorrectly?

Any advices are welcome.... Thanks. :hello:

Edit: Car has only 12000km and oem shocks were in good condition.

If they're brand new, they probably just need to settle a bit.

After 600kms it havent changed a bit.. :(

Still the front is lower than eibach informs in tuv certificate documents. It is actually really difficult to get My car to pass annual survey if measurements aren't close than what eibach promises in papers.

wow, 10mm difference left and right is not right.

in contrast, my G runs prokits and the sides are within 1.2mm of each other... it's been that way for the last 7yrs.

Have them redo it. Either it is bad springs, or poor install. If it is a bad install should be an easy fix, otherwise gotta get new springs. There are bad batches of anything manufactured, sometimes you end up buying it, which sucks.

In my experience, the Eibach springs have always been very consistant with their kits. I would suggest doing one of these two things or both.

Depending on how the suspension was installed and what parts were loosened, you may need to preload your suspension and retorque your control arm bolts. Some shops will remove or loosen upper and/or lower control arms during suspension install then torque down the arms while they are at full droop. This puts pressure on the bushings and does not allow the suspension to fully settle. The proper way to tighten these bolts is to have the control arms pushed up to static ride height and torqued.

The other option would be to switch the springs from left to right. This would require completely disassembling the springs from the shocks and switching the springs around. If your ride height issue stays on the same side then you know it's not a spring issue. If your front right raises 10mm then you know you have an issue with the spring.

Good luck!

Thanks for your answers and help. :)

Received answer yesterday from Eibach and they think that springs are in tolerances?! In my opinion they can shove these springs in their...

"
Hello,

Our technical department checked your complaint.

The lowering is ok, compared to our technical data (lowering tolerances have always to be considered).

Please find below the data before fitting / after fitting:

front right: 374 / 348 mm rear right: 378 / 364 mm
front left: 378 / 348 mm rear left: 386 / 360 mm
"

Measurements they sent are from their "demo" car and i would accept few millimeters difference but not 10mm. Actually my car does look very bad because rear is higher than front. :mad:

Well - i am trying to get a full refund from these and looking forward for coilover setup. Too bad there are few coilovers in market which have TUV certificate..

Thumb up for reseller in Finland. They agree on me about this issue..

Regards,

Maxi