Adapting VEMS 3.2 ecu to turbocharged 2.5 liter BMW inline 6 'M20B25' engine which is standard ie. without internal mechanical modifications.
Instrumentation, sensors and operational devices.
- Crankshaft Speed/Angular Position Sensor (CS)
- Standard BMW/Bosch 60-2 trigger wheel with variable reluctance (magnetic type) sensor. Standard BMW item manufactured by Febi-Bilstein - AB Technik.
- Manifold Absolute Pressure sensor (MAP)
- Genboard mounted (VEMS internal) Motorola (MPX4250AP) (2.5 kg/cm2) absolute pressure sensor.
- Coolant temperature sensor. (CLT)
- Standard Bosch item: 0 280 130 026
- Inlet Air Temperature sensor (IAT)
- FAE 33180
- Throttle Position Sensor (TPS)
- Standard OEM spare part 'SE04-M'. 2.6 - 0.88 kOhm angular potentiometer, without idle and full throttle microswitch.
- Idle Air/Speed Control Valve (IAS)
- Standard BMW/Bosch item 0 280 140 509 (rotary valve type).
- Lambda Sensor (LS)
- Wide-Band Lambda Sensor (Bosch LSU4). 5 wire special connector, ordered this with the wiring loom connector from VEMS shop.
- LSU4 Bosch item 0 258 007 057.
- Ignition Coil
- Standard spark delivery via distributor with original BMW/Bosch 'TZI' coil.
- Ignition module
- Using 'IGN 00' channel to drive 'dummy' Bosch '0 227 100 124' ignition module.
- Boost control
- Standard wastegate actuator control 'so called' 'N75' valve, VW/Audi origin; turbo control valve VW part code: '0589 062 83F'
- Turbo Control
- Turbocharger Holset HX30 center core with custom compressor and turbine, without variable nozzle turbine. Hence not needing control device.
- Injectors
- Bigger injectors than in standard naturally aspirated BMW engine are needed to cope with increased power level (from 170 PS to around 250-300 PS).
- For maximum fuel vaporisation modern 2 to 6 hole injectors are preferable.
- Bosch: B 280 431 824/20 item. Has four spray holes with wire splitter, four 'atomization helper' air channels, high impedance (~ 16 ohm). 261 g/min approx. 351 cc/min (N-Heptane).
- TODO: Firmware, VE, igniton advance and other tables.
A bit of a problem - genboard does not communicate properly ie. transmits 'garbage'. Startup serial settings cannot be changed in ecu config ( fixed 9600,n,8,1 no flow control at compile time).
Bootstrap mode (at 19200 baud) works (ie. responds with AVREF1 etc.) as expected, so it seems the ECM stays in BootLoader mode because firmware is invalid. Maybe after an unsuccessful firmware upgrade? Try to update firmware, it should work.
Todo: Need to organize wiring diagram, etc.
- TODO: Other information will be updated within few weeks.