Quote:
Originally Posted by ScottSmith
You could try unplugging the MAP control for the oil pump and drive around (#4 on https://www.realoem.com/bmw/enUS/sho...diagId=11_4760 ). If the ECU goes into limp mode, then the ECU won't like the dry sump either (since either way it won't have control over oil pressure). |
More info on how the MAP contol works. This is used for Efficient Dynamics and fuel consumption. Operating in MAP "mode" is normal operation ( normal daily street driving ).
While racing, the ECU disables the MAP "mode" and switches to what is called "emergency mode" to increase oil pressure limit.
MAP mode limits oil pressure to 4.5 bar.
Emergency mode limits oil pressure to 5.5 bar.
Emergency mode is triggered while racing because one or more of the following conditions are met:
- high engine oil temperature
- high water temperature
- high engine revs for extended time
Emergency mode essentially turns the MAP controlled oil pump into a Volumetric flow controlled oil pump when needed.
Limp mode is triggered if the pressure can't be maintained ( is either to low - emergency valve stuck open or to high - emergency valve stuck closed ).