pres589 wrote:I keep walking past a not great but usable condition e28 (I don't know which motor, the rear badges are gone) but I wonder if a 535i e28 with a turbo of proper sizing and such with a Megasquirt and generally updated ignition and fuel systems and such wouldn't be a wonderful way to move about. I don't see such a thing munching up nearly new M5's but it shouldn't be too bad.
There are a number of people who have done just that. The big six engine in the e28 works pretty well with forced induction, some of them are making 400hp or more fairly reliably (I know one guy who built an e12 5 series that's putting out more like 700hp, but that was a pretty extreme build.) The go to guy is Todd at http://www.turbochargingdynamics.com/

