Originally Posted by TMcNasty
x2. V8Freak since both air intakes lead into a common area (plenum)...you won't have a 100% correct side and an 80% correct other side. It'll average out to a 90% correct air intake reading across all 8 cylinders.
The VW MAFS are cheap enough that it's a no brainer to swap them both.
check this thread .. MAFs arrived from London Mike!
quote " I've tried and tested the VW Mafs from David S - sensor
I've also tried and tested sensor
Both alternative bosch sensor
parts work in the M5
- F00C2G2027 excellent top end performance, poor low end + stalling issues
- F00C2G2032 very good cost effective compromise but I personally felt bottom end/mid range torque wasnt as strong. Not as smooth.
In the end I had to resort to going back to the orginals - I took a chance with Mike - and it has to be said - it was worth every penny. A noticable difference. Finally I've got a benchmark to compare the
other sensors against. Simply put the alternatives aren't as good. It is worth paying the extra for the correct sensor
. Mike this represents greatvalue and thanks for the great service. Hiighly recommend. "
I have tested also 062 from my other car - 525dA and the M5 was running ok .. with some mid range loss of torque.
It is very clear that the compatible 032, 062, 027 are not giving the same readings as 029.
I will go with what BMW specified for this engine - F00C2G2029.
As for the other question I have asked , if one MAF is reading 100% on the left and 80% on the right...
If the air passing through the MAF on one side is going to the bank on that side, I think the ECU will make proportional fuel-air mixture .. 100% and 80% . If the air is going into a common area , I think the ECU will make an average - 90% like you said.
So if one MAF is going bad , the bank on that side will not run leaner, but the whole engine. Is that correct?
What happens if we run with one good MAF connected and the other disconnected? In this situation what are the default MAF values - % of 100% working MAF ? Is the ECU using the same values for the dissconected side as those read from the other good side? Is the engine running richer or leaner? Will it adapt itself using lambda values?