In Reply to: Re: E34 forced induction question posted by steve hoffins on March 27, 2000 at 10:02:34:
Just keep in mind that adding boost to a high compression motor is dangerous. Are the pistons forged steel? If not they are prone to exploding under detonation, which can easily occur with any power adder and or wrong fuel octane. Most blowers last like 30k before a unit rebuild is necesary (typical 9lb boost vortech for instance). You'll also be wearing out all aspects of the motor and changing oil more. If you're afraid of blowing the motor, don't run it at extremes like this, get a faster car. Personally rebuild bimmer motors are far too expensive to replace when they go boom. A 350 or 302 american motor is super cheap to rebuild, so people are more prone to abuse them.
Check your compression too. a 9:1 engine should be able to withstand 9lbs of boost for a good bit, if your motor is like most newer german cars, they run 10:1 or 10.5:1 and that would require significantly less boost without reinforcing the engine.
Expect to upgrade the entire fuel delivery system as well, might as well do the oil/water pump too since you'll be spinning the engine a lot faster than normal.
just my insight.