Planning VEMS 3.3 for turbocharging BMW M50B25 engine in an BMW E36. Lives in Sweden Gothenburg.
Enigne Spec:
- M50b25 without vanos
- Je Forged Pistons Compression 8,1:0
- MLS headgaskset 1,8mm
- ARP headstuds
- 500cc injector
- Preicison Turbo SC-44
- Tial 38mm wastegate
- 50mm PPF blow-off.
- 600x300x75mm intercooler
- Sachs heavy pressureplate 240mm
- Organic disc 550nm
- Walbro 255l/h fuelpump
- Primary trigger: VR
- Cam Trigger: VR
Began to calibrate the sensors today. Started with WB02.
Used the config from the manual and added my pump_pw_zero:0x64.
When i then tried to calibrate the O2% the values were unstable and hade a difference between 20.5-21.5. All values on mlp07 page were unstable except AFR. Any suggestion?
Then i began with EGT. Boiled it at and set the value on 100C. On ice it showed 0 C. Then i put it onto gasflame on a lighter. 880 degress just above the flame. Shouldn't this be 677C? At 15 C in the garage it showed 11C. Only changed multipler, the offset didn't change anything.
The IAT and CLT:
Ref - IAT - CLT
0 - 0 - (-3)
22 - 24 - 19
64 - 65 - 61
100 - 99 - 94
Should i be satisfied with this or should i try a diffrent temp sensor file? The reference temp is taken by a normal thermometer
Q: The wiring is almost done, 80% done. Have made a piout table, but unsure about how to wire the knock A&B. Also unsure about the Idle Air Control Valve. It's a Bosch 0 280 140 545 1738 981. It has 3 pins. I guess one is ground, the second 12v supply and the third should be connect to injector #7 or #8?
- is it same as MembersPage/GergelyLezsak/IdleControl ?
Q: I measured the trigger angle 60 degrees before TDC.
- that is perfect, 40..100 degrees are OK, and 40..60degrees is the best.
Q: I want a tachometer signal to the stock rpm gauge. How should i set this up? Is there an output for this, and can vems handle this when I'm using COP?
- use a separate output, and configure config.tach_channel and config.tach_divider; If you have no luck (review, measure, publish, but) consider that some RPM gauges require high input voltage signal which can be derived from the ignition transformer primary (using a few diodes).
The stock wiring scheme: http://www.autolib.diakom.ru:8001/CAR/BMW/1992/325%20Series/WIRING%20DIAGRAMS/11.pdf
Pin out:
| Function | EconoSeal pin |
| Sensor power 5V | 36-28 |
| Sensor ground | 36-26 |
| Power ground | 36-5 |
| Power ground | 36-21 |
| Power ground | 36-22 |
| Power ground | 36-32 |
| Flyback | 36-23 |
| injector 1 | 36-7 (Injector A) |
| injector 2 | 36-19 (Injector B) |
| injector 3 | 36-8 (Injector C) |
| injector 4 | 36-20 (Injector D) |
| injector 5 | 36-9 (Injector E) |
| injector 6 | 36-18 (Injector F) |
| CLT | 36-14 (CLT Coolant Temp) |
| IAT | 36-2 (Intake Air Temp) |
| TPS | 36-1 (TPS signal) |
| TPS 5v | 36-28 (TPS +5v) |
| IAC | ? |
| Crank position sensor (vr) | 36-27 |
| Cam position sensor (vr) | 36-13 |
| knock signal A | EC18-2 |
| knock signal B | EC18-3 |
| coil1 | 36-35 (Coil #0) |
| coil2 | 36-33 (Coil #1) |
| coil3 | 36-34 (Coil #2) |
| coil4 | 36-11 (Coil #3) |
| coil5 | 36-24 (Coil #4) |
| coil6 | 36-10 (Coil #5) |
| Fuel Pump Relay | 36-15 |
| nernst_cell | 18-13 |
| heater - | 18-18 |
| pump - | 18-7 |
| pump + | 18-9 |