Quote:
Originally Posted by ilikebmxbikes
yes, if you want all those things to work it is an insane undertaking.
My car runs an m3 ecu, m3 guage cluster and has m3 axels front and rear. The difficulty was wiring the m3 harness to the 135i body harness. That was probably the most insane thing of all. Mike Benvo of BPM Sport did all the coding. He is a genius and sorted out a ton of little fixes. everything works in my car like oem it is pretty insane.
If I did a z4 i would do a similar approach. m3 ecu, m3 cluster and fit the m3 diff, and rear axel if possible. Essentially make it a mini m3 like my car but use the shell of the z4. I have no idea how realistic that is.
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Nice build! RE: Z4M, I'd expect with enough money and time it could be done. The best way to go is to use all the parts the ECU is expecting and would be happy with. We have all of those parts--full drive train, axles, etc.--for sale over in the classifieds if anyone wants to take on a Z4 conversion or a 135 conversion.