Quote, originally posted by Corbic » 40mm actualy is the exact amount you can lower it. Any more and you need to do some pricey modification, or your car will handle like crap.
I grabbed a "total BMW" mag from Barns+Noble (may issue). It has a huge section on "Modifying your BMW". Explains all the modifications you can, can't, should and should not do for each Bimmer. GET THE MAG, best 8 bucks I've spent in a long time.
Found it, exact quote.
"Lowering the car up to 40 mm is OK, but any more and you'll need to use offset, rear trailing arm bushes to correct the excessive negative camber on the rear wheels. The easy answer? DON'T lower it any more than 40mm. "
40mm in the rear maybe.
40mm in the front is barely scratching the surface
I think my H&R Sport Springs and Bilstein Sport Dampers lower it about 40mm and it handles fine. The rear IS cambered a little, but the control arms are not past parallel.
The fronts are not past parallel at all and there is still plenty of fender gap. (in fact the car has kind of a reverse rake)
Yes, the more you lower the rear of an E30 the more camber you give it, but you will never break that parallel
Plus, that added rear camber really makes the rear stick HARD under fast cornering
The H&R Cup Kit lowers 2.1" front and 1.7" rear (40mm = 1.5")
H&R Coils drop up to 2"F and 1.6"R