The method I use to calculate air charge uses both speed density and mass air,
I have simply been comparing the 2 readings provided in the log which shows that for the given "air flow" from the MAF calculated into air charge, the speed density air charge error checking I ran shows that the MAP/IAT is reading significantly lower than MAF.
One sensor reading is not independent of the other, the problem is, I don't know which one is incorrect!
A stand alone boost gauge would probably clear this up.
The most logical explanation would be that considering the MAP/IAT has been replaced, and it's STILL reading lower -- and taking for granted that some kind of bizarre electrical problem isn't at play... is that there is a boost leak between the turbo and inlet manifold.
This would give poor performance, and highly mismatched air charge figures between the 2 sensors as boost builds, which is exactly what exists.
I highly doubt that it would stop the engine revving past 3000 rpm though, that is most likely a separate issue.
Cheers
James
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