MyE28.com

OK, so i was thinking about adding a clutch driven super charger to my 535is. The only thing is, I dont want it on all the time. Do you guys think that running a relay off the sport transmission switch to activate a clutch on the charger would be a good idea? that way I can have economy mode, then put it to sport mode and have the super chager kick in.

Sure, why not. MB does it...
But your in for a large engineering job to make it work right. Id rather have it load based activated, but thats up to you. Just getting a SC to bolt up properly will be a big job.

RussC