Anyone else have good luck with the PMAS 75mm Maf? I just installed one and it's working great so far. I've heard good and bad things about the PMAS 75mm unit and it seems to be a little lower quality than the Pro-M 75mm MAF. I know some of the PMAS guys used to work at Pro-M, so I figured they are calibrated about the same, dispite the bickering between their websites. I just bought and installed the 75mm PMAS Maf this weekend. The car surged a little bit after disconnecting the battery and reseting the computer, but now it idles perfectly and runs great. I definately feel a little power increase, and I'm spinning a little in 2nd gear now with my drag radials. Anyone else have anything good or bad to say about their PMAS or PRO-M 75mm MAF? Let me know. I supposedly have a lifetime warranty on it, but I want to make sure I won't have problems down the road.
I got a few minutes to share a few things I've seen
Before ProM went out of business I was in the market for a new meter
I called their tech guy and asked him why you rarely saw anything bad said
about the 77mm meter. He said it was their most accurate meter in the line
and since the 80mm meter used the same electronics ... they were just as
accurate.
I asked him about the bullet 75mm meter and why you saw some had issues
with it and some did not. He said it was simply because it was less accurate
thus the reason it was offered at a lower price.
Can't say the same holds true for PMAS or the newer ProM these days
but if the pricing is about the same now as it was back then .......
It would make me think things have not changed
I would tell you to consider a thing or two about an after market meter
1) Accuracy is always desired
2) Many things can throw off the accuracy
3) Special considerations need to be given to 94-95 Stangs thus the comparison
you see to the application on Fox stangs is a futile or fruitless kind of thing.
1) Kinda needs no explanation as I see it
2) Bends in the pipe
Clocking of the meter
Airflow reversions
etc
3) Our pcm's are load based and Fox pcm's are rpm based
thus
Many peeps get mislead when trying to compare applications here
You see ... On our pcm's ... The load is used to arrive at an optimum value
for fuel and spark tables and many other tables as well
The meter is what determines the load
Soooooooooo ... See how you wanna be accurate here :Word:
This is VERY VERY VERY important
Now sticking with these special considerations we need to look at the two
main ways Stangers run an aftermarket meter
A) No Tune
B) Tune
A) The electronic cal (ProM) or mechanical cal (C&L) methods these aftermarket
meter manufacturers have come up with .........
Well ... in a nutshell ... what they do is ........
Match a certain size inj to a meter they ... calibrated ... for that size inj
Many peeps call this the ... "Cheat Method" ... due to the airflow being reported
to the pcm by the ... aftermarket calibrated meter ... is a false reporting kinda
thing they employ.
Now ... this works kinda good for the Fox boys
but
We get can get into all kinds of trouble due to our different pcm
cause
That method hoses up our load factors in the pcm tables and such
btw ... A little rule of thumb for our cars and the ... Cheat Method is ......
24's and matched meter will not be too far off
42's will be way off
and
I'd think you would see how the in-between sizes would fit in
One more little tip while we are talking meters and inj's here is
For the most part ... An aftermarket meter caled for 19's is gonna be a
nonproductive kinda thing as far as gain goes.
Reason why is the OEM meter and inj size will be fine for bolt ons
and
You'll need larger inj's before you need more meter airflow capabilities
B) Of course ... with access to the pcm ... you just tell it the truth about .....
Amount of airflow passing through the meter
and
Injector size
Now ... about the last part of your last sentence
There is no way in the world
You or anybody else for that matter can expect to have no probs when you
move away from the OEM meter and inj size without a tune.
Sure ... Some have done it with ... What they say was ... No probs
but
You can bet the farm ... More have had issues than those who didn't
Always remember this about some peeps
Not everybody has the same definition of ...... Good Drivability :Word:
You have to consider every combo has so many variables
I mean one
or
Several of them
or
Any combination of them
They could hose up things for poor drivability
Just consider the different air intake systems we all use on out Stangs
They got different size pipe, different bends, different meter placement,
and such.
Then if you consider a thing most Stangers will change as often as their
under ware ..... fuel pressure.
I'm convinced two fellows could build the same combo and each one very
well could have different drivabilitly issues
For all the reasons above ... and more ...........
Thats why the peeps who know what is available with a good tune always
seem so adamant about its benefits
You just tune for what your particular combo wants
Hope some of this general info will cause some to consider what is really
going on in areas of their Stangs they might not be aware of
Grady
