Blackbird

so my ltrims swung from -1% to -4% all the way to +6 to +10% by moving the MAF to the pressure side of the blower.

I know I can easily adjust via the IFR table but in this case is the MAF table the right place to go?

S_J_H

I had to modify my maf table when I converted to the pressure side. It also reads much lower now at full boost and I had to command a much righer PE number to keep A-F inline.
My maf readings are way off because I have bends before and after it. There was no way I could avoid it with my setup, so I just use the PE tables and the wideband and pretty much forget what the maf reads at WOT.
But at cruise you should be able to modify it with the maf table.

Blackbird

I have about 6" of straight both before and after the MAF so hopefully that helps it some.

so do I want to scale the entire MAF table? I have never mucked with that one before.

I assume values need to go up to bring Ltrims back down to slightly negative?

jimmyblue

iTrader: (11)

I wonder if pressure side being hotter, is warping
the MAF readings (it being a hot wire sensor and
trying to maintain a wire temp, way-hot inlet air
might confuse the equation some?). Certainly the
same mass air flow of (say) 200F air will cool the
wires less effectively than of 100F air. Maybe
enough to account for the 15% drift. At least
this theory goes in the right direction (under-
reporting mass airflow), even if it isn't really what's
at play....

But since it's a MAF related change I think the MAF
table is the right way to represent it.