GM MAF Flow rates? Options

[awd4kicks]

I recently had a discussion with Natedogg concerning the GM MAF. From what we had heard the 3" MAF is only good for up to 800CFM. Some of the turbo upgrades going on around here will pump more than this figure. So the 3.5" MAF has been employed.

In a recent discussion with Dejon though, he said that the 3" MAF is good for far more CFM in a 'Blow Through' set-up. I currently have a 3.5" GM MAF with 2.5" blow through piping and 3" couplings. I can either get a 3" MAF or the couplings flared for my 3.5" MAF.

Does anyone have definitive numbers on the GM MAF's flow numbers, draw-through and blow through?

[RacerX11]

The MAF will flow considerably more in a blow-through setup. You might want to surf some LT1/LS1 Camaro boards and see what kind of power numbers they are putting down running blow-through turbo setups with stock MAF's.

Ideally you want the piping to be close in diameter to the MAF to avoid cross-sectional area changes that will introduce turbulence at the sensor, which is bad for sensor accuracy. The 2.5" piping should become a flow restriction before the 3" sensor does, so I think the important thing is how high can the 3" MAF read before it maxes out?

Marty