Re: 735i-745i conversion. Anybody tried it? (archive)

I have 86 735I.. Car is mint-perfect with 12K miles. I want to "bolt on" the 745 turbo assy to my my higher compression m30 motor. With the exception that my motor is higher compression and I'll probably have to run high-octane (not a problem for me) what other concerns must I look out for? Will my M30 be able to supply the 745 turbo with oil and return? How does the 745I get more fuel under positive manifold conditions? Crankcase breathing concerns, checkvalves, etc. I was planning on using aftermarket FMU, so the factory computer should not have to bother with anything. I also want to try this without messing with the computer as I understand the turbo waste gate is mechanical. Any input on this subject would be great.
Matt

Matt, I am in the process of having a 745i motor installed in my '88 535is. We opted to use the entire motor and not just the turbo and components because the 745i has the lower compression that BMW deemed neccesary. (We are also going to fit a larger than stock water-cooled turbo.) The head on the 745i is completely different. You would have to drill and tap your motor for the oil supply line. I'd suggest getting all the turbo induction/injection parts to swap over to your car.

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