my M30 turbo engine/VEMS GenBoard 3.3 build page
2008
After some piston-replacement, new turbo and cam, head studs and other slight mods, the car is running again.
My first interesting problem (related to VEMS) is strange voltage reading on the ECU:
http://quasar.dynaweb.hu/%7Elezsi/bmw/200808/datalog200808311613_3rd_gear_acc.xls
2007
2007.09.03. UPDATE
Car is mapped up to 1.5-1.7bars of boost (which is reached only in 5th gear)
Got boost control also, but not in everyday use, just preparation for dyno run planned today evening.
Knock experiments made.
Details going to be here: MembersPage/GergelyLezsak/BigSixTurbo/KnockSense
2007.07.31.
Car is mapped up to 1.2-1.3 bars of boost, probably around 450 BHP on the crank.
- I've got slight missfire problem at the high-rev low-map area (50-60kPa, 3000-5000rpm), don't know the cause.
- This is know considered to be too lean lambda, which was around 1.05-1.07 -not extremely lean but maybe low compression engine doesn't tolerate it well
- Found a strange behavior with mixture: Saturday it was mapped around 0.75lambda in the high-boost area, and the same untouched map (and config) resulted ~0.95lambda monday.
- The only change I can recognize is around -15 degC difference in ambient temp. -Which was not really reflected on MAT sensor's temp.
- that suggests the MAT sensor placement is not good
- -15C is appr +5% air density. So even than, the change is too big
- It is solved, a vacuum line popped from the fuel pressure regulator. Very dangerous to have 3 bars of pressure instead of 4-4.5bars. And hard to notice as lambda and idle control corrigates values in normal cruising, no big signs of problem.
Can you check the wideband parameters? pumppw_zero and nernstdc_target (according to the values you got from WebShop via email, and maybe the values you had inside the ecu when shipped), and redo free-air calibration. Maybe misfire also contrinuted to the lean reading.
2007.07.14.
I had serious troubles with ECU #378: S259 and P259 outputs didn't work at all. INJFET and I259 seemed OK.
Lambda heater value on LCD didn't start to raise at MDE02 command. However later the sensor got hot somehow -not every time. Could this be a config problem?
- Roland reported it as a config problem which means configured Narrow-Band lambda instead of Wideband, which looks Wideband in megatune! -It can easily kill the engine if not detected. Which config variable needs to be checked?
Later I started the car with another ECU. No tuning yet.
OLD DATA
- I plan to use MembersPage/GergelyLezsak/COP ignition
- Just another option: MembersPage/GergelyLezsak/WastedSpark
- I'll need MembersPage/GergelyLezsak/CamTrigger to use them sequentially
- More to come...