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Motronic 1.3 conversion for M30B28
Posted: Mon May 21, 2018 5:17 pm
by Joe Boston
has anyone install M30B35 wire harness with Motronic 1.3 with 179 ECU on M30B28 engine ?
Does anyone know if the 179 Ecu is compatible? or it this ECU specifically for 3.5 engine with high horsepower?
or would a megasquirt work best with M30B28 engine...
any insight is appreciated.
Re: Motronic 1.3 conversion for M30B28
Posted: Tue May 22, 2018 12:09 pm
by Mike W.
I don't think I've heard of it, but it should work ok. A bit less than optimum since the timing curve is for a 9:1 CR engine, not 8.2:1, but since the head and valves are proportionately larger for the 2.8, it should be mitigated somewhat. BMW used the same ECU and AFM on both 2.8 and 3.3 engines in the E12 era so those parts don't have to be exactly matched to engine size. Again, because of the lower compression ratio you might not realize the full benefits, but at worst I would expect a nicer, cleaner, smoother running engine with no loss of performance. Then again, you could always run M1.3 for fueling and a conventional distributor for timing.
Re: Motronic 1.3 conversion for M30B28
Posted: Wed May 30, 2018 12:55 pm
by RDAvena
Joe, I am doing the same "upgrade" to my 528i. Well , more of an in between step while the B35 gets built.
Hopefully it will be running on Motronic 1.3 by the end of June.
Adding all of the Motronic 1.3 parts should get it running until the ecu adapts and levels out to what the O2 sensor is reading.
Also using new water temp and O2 sensors should help eliminate some of the tuning issues.