1985 BMW 728i [E23]
- 2.8L inline 6-cylinder M30 engine (M30B28)
- L-Jetronic fuel injection
- 5-speed Getrag 260/5 manual transmission
- Location:
Upgrading to:
- 3.5L M30B35 engine
- Engine came from a 1989 BMW 535i (E34)
- Originally used Motronic 1.3, replacing with VEMS 3.3
- Re-built (overhauled) with new piston rings, crankshaft/connecting rod bearings, timing chain, rocker arms, valves, valve guides, seals and gaskets
- Re-use stock 60-2 crank trigger wheel
- VEMS 3.3
- Assembled VEMS 3.5 board (same schematic as 3.3) delivered 2009-06-03
- 8 ignition IGBTs: Fairchild [ISL9V3040P3], 17A, 300mJ, 400V, N-Channel Ignition IGBT
- 10 injection MOSFETs: Fairchild [FQPF20N06L], 15.7A, 60V N-Channel MOSFET
- 30V flyback, ON Semi [1N6282A] (1.5KE30A), 1500W 30V TVS
- Assembled VEMS 3.5 board (same schematic as 3.3) delivered 2009-06-03
- Convert to coil-on-plug ignition
- Use Bosch 0 221 504 464 (BMW part number 12-13-1-712-219 [photo] used in 2002-2006 3/5-series M54 engines)
- Manufacture cam sync wheel to replace distributor rotor
- Sense using Honeywell [1GT101DC] Hall-Effect Gear Tooth Sensor.
- Make sure the sensor mounting is extremely strong. Make it as strong to be able to lift the engine. Vibrations are no fun.
- You might consider using [3x2 coilpack]. It's a very good solution (more energetic sparks in the cylinder than most COPs), and the stock 60-2 crankwheel is enough
- New ACCEL 24 lb/hr injectors, 14.0 ohms (stock for M30B28 is 19 lb/hr)
![[photo]](http://e23.bimmerclub.ph/images/ignition-coil.jpg){kind=link}