M30 B34 Motronic 1.3

[athayer187]

I figured I'd ask this question here - has anyone done the motronic 1.3 swap on a B34, and what was the outcome (idle quality, power)? Also, what chip do you run (stock, Dinan, EAT, etc)? Thanks!

[///Maddog9000]

mye28.com is a good source for conversion info. You should be able to find everything you are looking for there.

As for chips, m1.0 uses 24 pin socket and m1.3 uses 28 pin.

[athayer187]

I'm actually over there more than I am over here - I just see that it's much more common for E30 guys to swap a B34 over to motronic 1.3 (not a B35 swap), and was wondering how it ran.

[///Maddog9000]

I assume smoother operation through all ranges. Motronic 1.3 is just more efficient and "smarter." It might not be very noticeable but, it will run better.

I had planned on running m1.3 on my b34 build. I decided to use a MSII PnP kit from DIYAUTOTUNE.com. I will use a m1.3 harness and sensors from a b35 but, use a MSII ecu instead of the Bosch computer. Full stand alone but, without the hassle of building a custom harness.

[chadthestampede]

I did it on a b32. It feels smoother, and seems to run quite a bit better, though I never did get it running right with the old Motronic so who knows. Suffice to say it's easier to get parts and just better all around.

I also ran it with a Dinan chip and was pleasantly surprised. HTH.

[george graves]

Someone correct me if I'm wrong, but there is also a motronic 1.1. It's the same as 1.3 except has fewer fault codes IIRC. I could be wrong on that - but that's what I recall.

[chadthestampede]

The Motronic 1.1 System was used by BMW from 1987. This was then superseded in 1988 by the Motronic 1.3 system[6] that was also used by PSA on some XU9J-series engines (which previously used Motronic 4.1).[5]

The Motronic 1.1 and 1.3 systems are largely similar, the main improvement being the increased diagnostic capabilities of Motronic 1.3. The 1.3 ECM can store many more detailed fault codes than 1.1, and has a permanent 12-volt feed from the vehicle's battery which allows it to log intermittent faults in memory across several trips. Motronic 1.1 can only advise of a few currently-occurring faults.[6]

The systems include a knock sensor for ignition timing adjustment and the option for a lambda sensor, enabling their use with catalytic converter-equipped vehicles.[5]

The ECMs have 2 injection outputs, and the injectors are arranged in 2 "banks" which fire once every two engine revolutions. In an example 4-cylinder engine, one output controls the injectors for cylinders 1 and 3, and the other controls 2 and 4. The system uses a "cylinder ID" sensor mounted to the cam-shaft to detect which cylinders are approaching the top of their stroke, therefore which injector bank should be fired. During start-up (below 600 RPM), or if there is no signal from the cylinder ID sensor, all injectors are fired simultaneously once per engine revolution.[6]

[lashtx]

Knock sensor

I know my 1.3 had no knock sensor. Is it saying there is an input for one?

Kris