EFI questions and answers

[Edward Hernandez R]

"The MAF's measure equally in both directions and don't know which way it's going so they tend to jump their reading up at high resonance periods or turbo pressure blow back."

Some MAF's are bypass type, such as Ford's(not quite sure what you've been seeing out there since the one you describe doesn't sound like a bypass type). This type is not designed to measure equally in both directions. I know of one person who successfully uses one for a 650hp racing vehicle.

Certain OEM turbo air routings are designed to dump pressure back into the inlet system downstream of the MAF, not to atmosphere. I've heard of many people altering their system to dump to atmosphere. Then they wonder why their vehicle's drivability suffers. Like you say, if you do that, the MAF is now measuring more than the engine is acutally consuming.

"The Ford guys don't weem to bring up th efact that Ford systems will not allow actual readings of sensors, just a listing of whether or not readings are within parameters. Not!"

Huh? Why bring up the obvious? Show me a sensor that put's out degrees Celcius(or rpm or hp etc) and I'll show you a signal processor that converts voltage(current, frequency, etc) into scientific units. I don't understand your beef.