pro-m maf
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larrym1961
5 Year Member
They do need to be calibrated to how your air filter is used too, ie: cold air, stock air box or filter attached directly to the air meter. I have my air filter attached to the meter so I had to send my meter along with the filter to PMAS for a re-calibration.
Never heard that one larry. As long as the air-flow is consistent by the time it reaches the MAF, I can't see how the tube or filter it's hooked up to matters.
To the OP, your son is wrong. If it's calibrated to your injectors, it doesn't matter.
To the OP, your son is wrong. If it's calibrated to your injectors, it doesn't matter.
You won't know unless you try it. I have a c&l mass air housing with the stock meter, the c&l housings have sample tubes that meters the incoming airflow, they sell different sample tubes for setups like cold air, factory air box and if you run the filter directly off of the mass air housing, on the pro-m website they tell you to use a mass air housing screen to straighten out the turbulent incoming air so the mass air meter gets the correct reading. I went from a filter directly on the housing to a cold air in fender kit and correct sample tube and the engine wouldn't run right. I added the mass air housing screen and now the engine idles smoothly and runs great, i guess i got lucky.
I see the trend to tweak the curve a little on the meter if your using a CAI set-up, its due to the bend right at the meter....
As long as it was made for your computer, and calibrated to the injector you want to run it should be fine. Was it calibrated to a "S" setting, you'll see that engraved after the 30lb on the ID tag, if so that is the supercharged caliration which adds more fuel. Personally I do not like that cal and use the standard setting on all combo's, I do not like the CAI setting either.
As long as it was made for your computer, and calibrated to the injector you want to run it should be fine. Was it calibrated to a "S" setting, you'll see that engraved after the 30lb on the ID tag, if so that is the supercharged caliration which adds more fuel. Personally I do not like that cal and use the standard setting on all combo's, I do not like the CAI setting either.
larrym1961
5 Year Member
When I emailed PRO M about a re-cal on my meter, that is what they asked me, how the meter was attached? By stock air box, cold air kit, or conical filter attached @ the end of the mass air meter housing. Then that way the meter could be idealy calibrated to the injectors. That is probably why they sell them w/ either with a regular calibration or a Cold Air calibration.
On my meter, with the filter attached, They wanted the filter and air meter as a complete unit to calibrate it.
I may be wrong but that is how PRO M wanted to calibrate it.
What's important and what I don't see mentioned so far in this thread is... What are you tuning with?
Are you intending to use this meter, some 30lb injectors, and an unmodified OEM EEC? If so, you're just "hoping" for a good outcome and I wish you the best of luck with that.
What your son is talking about is the difference between and N/A type meter and a Blow Through type meter. Yes... there are typically differences. An N/A meter (there's another term for this but it escapes me at the moment), is designed to measure in teh ambient air tempurature range. A Blow-Through meter is designed to measure elevated air tempuratures that often come from a supercharger or what have you.
The difference? Meters work by providing a consistent and measureable level of resistance. The variance in that resistance is provided by changes in tempurature of the tiny metal (or pair) of wires that are suspended in the air stream. Air flow is 'sampled' by taking a measurement of the resistance of these wires as air passes over them. More air, more temp variance, more/less resistance depending on the amount of air passing through.
So.... You can see how measuring heated air vs. ambient air would make a difference.
Of course NONE of that matters if you have some method of tuning for it and have a reliable meter that gives consistant results.
So for the folks that said, "It doesn't matter"... That's a true statement so long as you have a method of tuning your EEC to match the meter to the injectors you're using.
If not... it matters a LOT because someone has tried to "tune" (I use that term loosely in this instance), the meter to make the OEM EEC function correctly with X sized injectors. The tempurature range of the air that you're sampling under these circumstances can make a big difference.
Are you intending to use this meter, some 30lb injectors, and an unmodified OEM EEC? If so, you're just "hoping" for a good outcome and I wish you the best of luck with that.
What your son is talking about is the difference between and N/A type meter and a Blow Through type meter. Yes... there are typically differences. An N/A meter (there's another term for this but it escapes me at the moment), is designed to measure in teh ambient air tempurature range. A Blow-Through meter is designed to measure elevated air tempuratures that often come from a supercharger or what have you.
The difference? Meters work by providing a consistent and measureable level of resistance. The variance in that resistance is provided by changes in tempurature of the tiny metal (or pair) of wires that are suspended in the air stream. Air flow is 'sampled' by taking a measurement of the resistance of these wires as air passes over them. More air, more temp variance, more/less resistance depending on the amount of air passing through.
So.... You can see how measuring heated air vs. ambient air would make a difference.
Of course NONE of that matters if you have some method of tuning for it and have a reliable meter that gives consistant results.
So for the folks that said, "It doesn't matter"... That's a true statement so long as you have a method of tuning your EEC to match the meter to the injectors you're using.
If not... it matters a LOT because someone has tried to "tune" (I use that term loosely in this instance), the meter to make the OEM EEC function correctly with X sized injectors. The tempurature range of the air that you're sampling under these circumstances can make a big difference.
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