|
Weight loss in 'unsprung' suspension parts is very important for performance. The aluminum M3 parts weigh about a pound or two less per part. Much greater reductions are possible in the springs and dampers. Brakes (caliper & rotors) are another opportunity. The biggest reductions in unsprung weight are in forged rims and lighter non-rft tires. In total it is possible to reduce unsprung weight by 130lbs or so.
But clearly the biggest effect of the M3 parts is the reduction of uncontrolled movement. Imagine a gymnast performing on a balance beam that is a rubbery pipe instead of a solid wooden piece.
Turner MS takes this as far as offering solid subframe bushings and damper mounts. No way those would be useful for a DD.
IMO the E9x is especially problematic in that the bushings and other components of the suspension are required to deliver a luxury car ride on rigid rft tires.
The total M3+ package that Harold et al have put together is quite amazing.
|