extra things needed?

mo_dingo said:

Can't you eliminate that problem with the tweecer, or no?

But I do see your point. The cal tube makes the voltage lower for more air, this allowing for more room for CFM increase
Scott

Click to expand...

I ain't gonna get involved with the C&L thing since we were talkin about ProM's.

Lets start off with the oem maf whether it be GT or Cobra as we all know they are the exact same maf.

The reason the same maf works on each Stang is simply due to the fact neither Stang can produce enough air flow to make the maf too small.

Notice the focus is on air flow and not fuel

Mafs are all about air movement ... NOT ... size of fuel inj's.

Ford mafs are built to report the amount of airflow the motor can generate and then they select the size of inj needed to support that amount of air flow.

That air flow is in a range of 0.0 to 5.0 volts. This is the only range the pcm can work with as an input from the maf btw.

Three examples with the oem 94-95 70mm GT/Cobra maf.

1 GT ......... 19ln inj's
2 Cobra ..... 24lb inj's
3 My 95 .... 30lb inj's

You see different size inj's as the fuel needs of each combo is different

What is common in all three examples is the motor could not draw enough air through the maf to peg it or render it as being too small. Well ... my 95 did ... but lets just forget that for now to keep things simple.

... THIS IS IMPORTANT ... Remember, we are talkin about how Ford does it with NO elevated fuel pressure from afpr's or any kind of calibration like ProM does it.

This is a way to see the typical modded combo runs out of fuel (inj size) before air flow measurement (maf) becomes a prob.

You'd see more peeps with lean fuel probs if it weren't for afpr's ... although they are not all that precise ... they have saved a lot of pistons.

anyway I digress ............

Here is where Scott talks about using a Tweecer to make a 19lb caled maf work for a h/c/i combo.

Just as the oem maf can be pegged with the additional air flow of h/c/i, so can a 19lb caled ProM maf.

ProM set it up to work with the stock pcm values ... Correct!
That means it ain't gonna be able to report any more air flow than the oem stocker maf.

If you go in the pcm and tell it you got 24's, 30's 36's, or 42's ......
It don't make no diff cause the combo very well could over power the maf so telling the pcm the correct inj size is a moot point here.
AND
The transfer you load in it with the Tweecer ain't gonna be all that different from the stocker anyway
SO
Loading in the t curve is not gonna get you anymore room either.

The little 19lb caled maf is just too small

See if this helps ..............

You see how the blower boys have probs with pegging mafs ...

Same kinda deal but with much more air flow
and
You see they always have to get a bigger maf.

Hope I splained it so it made some kind of sense

If not ... I at least got it started for us to talk about

If anyone wants to move this to tuning or start a new thread

Grady