My project car is a BMW E30 318i from 1984. I bought it in february, 2005. Back in 1996 the car had been rebuilt and got a 325i engine with a turbo.
Now it's running on GenBoard v3.3 which controls injectors, ignition and idle air.
You can find me on some internet forums as 'lezsi'.
Original setup
Car outlines as I bought it:
- Engine: M20B25 (325i from ~1987) 2500cc, 6 cyl inline, 12 Valves, SOHC (stock, but lowered compression) [Engine bay(huge pic)]
- Fuel injection: Bosch injectors from E36 325i (part no. 0 280 150 415) maybe 190 cc/min @3.5bars. R=~16 Ohms (high impedance)
- Fuel pump: Stock in-tank + stock external
- Staging injector: Bosch no. 0 280 170 400. It comes from the jetronic cold start inj. (not a PWM system!), maybe 113 cc/min @3 bars, R=~3 Ohms. Switched by ~half throttle pos.
- Adjustable fuel pressure regulator (home made, seems working, no fuel pressure meter altough). See MembersPage/GergelyLezsak/FPR
- Water injection. High pressure pump (headlight washer), Bosch cold start injector. Switched by ~half throttle pos. See MembersPage/GergelyLezsak/WaterInjection
- Turbo: Mitsubishi TD04-11B (it's a small one from 324d), internal wastegate with stock mech. actuator arm.
- Idle control : stock solenoid, Bosch part no. 0 280 140 524. See MembersPage/GergelyLezsak/IdleControl
- Intake: stock AFM with direct filter. Small air-to-air intercooler and a mech. pressure gauge. Some adjustable pressure valve as blow-off. Factory throttle pos switch (3 state; idle, between and WOT). See MembersPage/GergelyLezsak/TPS
- stock 60-2 VR crank-trigger for Motronic 1.3, stock coil, mechanical distributor, 1 degree colder sparks. See MembersPage/GergelyLezsak/Trigger
- inductive sensor from ignition cable (cyl. 6?) for cam position. See MembersPage/GergelyLezsak/CamPos
- Coolant sensors: Two coolant temp (seems stock) at thermostat housing. See MembersPage/GergelyLezsak/WaterTemp
- 1. (one pinout) shows 120ohms @25c
- 2. (two pins) shows 2.18kohms @25c (this one sounds pretty standard temp sensor)
- More sensors: There's no O2 sensor, and IAT is in AFM
- Motronic 1.3 with tuned chips.
- 4.27 limited slip differential (Small housing)
![[Engine bay(huge pic)]](http://quasar.dynaweb.hu/~lezsi/bmw/original/PICT0004engine-bay.JPG){kind=link}
Project plan
First goal : Achieve maximum power output from current mechanical design with reliability in the long run. Good driveability and fuel economy is also in sight. This is done by now.
Future plan : Additional mechanical improvements possible (larger injectors, big turbo, etc.)
Project stages
- Stage 0 - readonly first : MembersPage/GergelyLezsak/StageZero
- Stage 1 - control injection : MembersPage/GergelyLezsak/StageOne
- Stage 2 - ignition control : MembersPage/GergelyLezsak/StageTwo
- Stage 3 - boost control and whatever: MembersPage/GergelyLezsak/StageThree >actual task now <
Design section
- WBO2 mount : MembersPage/GergelyLezsak/WBO
- TPS conversion : MembersPage/GergelyLezsak/TPS
- Wiring colors, pinout, etc :[xls]
Financial
Firmware
- Config and tables dump 20050718 - [txt]
- Have to make my own MembersPage/GergelyLezsak/FirmWare
Megatune related
- Bugs found - MembersPage/GergelyLezsak/MegaTune
Suggestions - some of them now obsolete
I try to control EFI first and leave ignition to motronic.
Issues with this configuration:
- I have to share crank VR signal between two computers. There's a ~5V DC signal from the ECU. To share this signal, a series capacitor ("high-pass" filter) is needed so the AC is passed but DC is not. Min. value is 10uF (25V or higher recommended) - easy to mount onboard
- When two ECUs are connected, the GND easily picks up some noise so special care is needed. This is working nice now, no problems.
- consider ExhaustGasTemp (will be a small appr. 10 mm drill in the exhaust before turbo)
- It's stated that cast part need to be heated with gas welder (?), then simply weld it with CO welder. -It's all not suggested however if any other option possible.
- get a wastedspark coilpack. Common to use Ford EDIS packs, but Opel or VW might also be an option
- 3 transformers with 2 high-voltage terminals each)
- or get 2 coilpacks if you can only get coilpacks for 4 cyl (there will be a spare)
Any suggestion is appreciated...