Quote:
Originally Posted by ghost.M
I found this a few weeks ago while wondering the same question. I'm not sure if US/UK Spec M235i have the same spring rates but the guys in the UK have done a bit of work to figure this out. Rates for rears are below, as is a link to the discussion on babybmw.net. It seems like the fronts are 120-180 lb/in depending on the model of your car or aftermarket springs you buy. If someone here knows better, please share! OP - Hope this helps!
H&R M135i Rear = 348 lb/inch
OEM M135i Rears = 383 lb/inch
Eibach Rear = 384 lb/inch
'AC Schnitzer' Rear = 384 lb/inch
H&R M235i Rear = 392 lb/inch
OEM M235i Rears = 417 lb/inch
OEM M140i Rears = 587 lb/inch (~same as OEM M3/M4)
https://www.babybmw.net/forum/viewto...44195#p1344195 |
They seem to have done a lot of analysis on the rear spring rates with plausible results, but the rates for the front that were thrown out are highly suspect, a lot less than expected and would lead to handling problems if only 1/3 or 1/4 the rate of the rear. They also don't take into account any variable rate effect as the coils bind or the bump stops are reached.