Mustang Tuning / AFR / Timing Help!

Stock maf is a 70mm with a divide in the middle. The thing to look at is the flow rate, and the factory 94-95 maf is on the low end and IIRC less than a 65 Pro-M/PMAS flow rate. One needs to log and see were they fit if they are pegging a maf out, its the only way to know for sure. I would assume the combo in question would peg the stock 94-95 meter.

If one has a tuner like QH or tweecer R/T I would look for a factory Ford MAF or the SCT MAF that has 30pt transfers like stock. Then I would look at a Pro-M/PMAS not because its a bad maf just the others are going to be a little easier to tune since you dont have to convert a 10pt transfer with the Pro-M/PMAS to 30pt. Its not that hard to convert a 10pt to 30pt but if you can skip that step...one less thing. Then there is the "cheat" for the injectors and if one ever changes injectors things can get funky quick unless you send it back and the further you get from the stock inj. the bigger the chance you will be sorting out a driveability issue somewhere on our load based setups.

I was told by my truck tuner to be in the 14 range idle and around 12.8 WOT for a AFR.



Dude how did you get your fenders off like that? I need to do that to mine and they are being a pain in the ass.

I also do not see how the little OEM meter will support such a combo

You don't have to be afraid of a Pro-M with a cal
as long as
You load in the curve and get it fairly close

Like Greg said

Running aftermarket meters in cheat mode makes many things be
quite HOSED in our 94-95 load based pcm's :Word:

Grady

final5-0 said:

I also do not see how the little OEM meter will support such a combo

You don't have to be afraid of a Pro-M with a cal
as long as
You load in the curve and get it fairly close

Like Greg said

Running aftermarket meters in cheat mode makes many things be
quite HOSED in our 94-95 load based pcm's :Word:

Grady

Click to expand...

Grady I just tuned a 95 cobra the other day with a stock meter and 24s , built 306 with E cam (small I know) , procomp 210cc heads , trickflow R series intake , had to fatten it up some but the meter was at 4.64 volts at 6200 rpms is when the cam ran out of steam

2002BLGT said:

Grady I just tuned a 95 cobra the other day with a stock meter and 24s , built 306 with E cam (small I know) , procomp 210cc heads , trickflow R series intake , had to fatten it up some but the meter was at 4.64 volts at 6200 rpms is when the cam ran out of steam

Click to expand...

That does not surprise me at all

Depending upon combo parts chosen ..........
the little OEM meter will go farther than what many suspect

I'd guess a ballpark value of about 290 to 310 sae to the wheels

Of course ... it all depends upon airflow past the meter which is dictated
by heads, intake, cam, bla bla bla

If you look at my sig combo ........
I barely pegged the OEM meter and that was with me upping the maf volts
in the pcm to 4.999999 for extended range

It just seems to me with the additional airflow of the cubes of the original
poster ... the meter would run out room

Before I go ... It might be helpful to make one thing clear to those who don't
have pcm access here

The talk here is all about one being able to adjust with the pcm the airflow
values of the meter to reflect changes made by the hot rod parts

We are not talking about using only mechanical methods such as
a different caled meter
no matter if tubes like with the C&L or electronic like with Pro-M

Bottom line is ... You'll run outta inj B E F O R E you run outta meter

Grady

In a way ... AFR during closed loop is kinda pointless cause the O2's are
in control

You can look at the K's to see if they are adding or pulling fuel
then
You can adjust meter airflow or inj values

Of the two ... I think using inj values produces a more stable tune

Grady

final5-0 said:

In a way ... AFR during closed loop is kinda pointless cause the O2's are
in control

You can look at the K's to see if they are adding or pulling fuel
then
You can adjust meter airflow or inj values

Of the two ... I think using inj values produces a more stable tune

Grady

Click to expand...

Agreed on using the inj values