[PureE92]

I put the tein springs on my car too cause I liked the rates but the drop was too low. I ended up going with the bmw performance springs but I went a little bit stiffer resulting in a higher sitting car. I can finally clear most driveways without scraping and the spring rates are pretty stiff. 176lb front and 530lb rear. It’s close enough to the tein and I’m happy.

[rvphuerta]

I have too much rake right now. I need to remove the rear height adjuster. It's a bit more work to try to get it right. That why I'm trying to put as much info on the height the spring give with measurements for the next person. I really thought the E30 upper springs perch would give more height than I got. I think that is what's lacking on most lowering spring info. I'm the type of person that needs measurements. I did like the spring rates on the Megan racing lowering springs for E90 M3. Obviously the front upper springs seat doesn't fit our spring perch. I do like them. I'll give a better review on the ride after 1000 miles and I get the correct height that I want.

[rvphuerta]

for E90/E91 Sport/Msport suspension: (measured from the bottom of the wheel(actual wheel and not tire) to the top of the arch on the fender; Obviously in the center.

Front Axle:
16" rim- 569mm
17" rim- 584mm
18" rim- 596mm / 23.46 inch / 13.71 inch
19" rim- 609mm

Rear Axle:
16" rim-550mm
17" rim-564mm
18" rim-577mm / 22.71 inch / 12.96 inch
19" rim-589mm

This is the OEM sport suspension measurements I found. Don't know how accurate it is. I think I would have been good with the eibach springs. I don't know the height on Eibach, not big on 2 finger gap measurement or lowers 1 inch. I prefer the measurement like the example above. What is the optimal suspension height? Can't seem to find the info. On the e46 is easy to find the info. On the E46 the lowest recommended height is 13.5 inch front and 13 inch rear. Reason the control arms are no longer parallel.

[mattanderson]

Mine is an E92 328i, so it's not quite apples to apples; but just for reference, here are my wheel-arch-to-bottom-of-wheel measurements on an 18" wheel:

Stock non-sport springs (C4 front, C1 rear)
Front: 24.75", 24.69" (L, R, respectively)
Rear: 23.88", 23.63"

Pro-Kit springs (p/n 2085.140)
Front: 23", 22.88"
Rear: 23", 22.88"

Pro-Kit with E30 strut mounts
Front: 23.5", 23.38"
Rear: 23", 22.88"

The E30 mounts gave me a solid half inch of travel by my measurements.

After 15k miles / 1 year of hard driving, it's settled another quarter inch or so all around.

[rvphuerta]

Thank for the information.

That's a decent drop from Eibach springs. I think I would have been good with Eibach, I do like my spring rates more. I'm at 22.875" in the front on both side, the height difference between left and right is negligible. I'm actually ok with the front that low. I don't have fenders liner issues and my front wheel tire is 18x9 +35 255/35r18.