Ok, so I'm getting ready to get a new tune and i was filling out the form to list all of my mods and the MAF I have is off of a 97 Cobra. When I was filling out the form, it did not give me an option and I cannot figure out what model i need to put. It is an 85mm calibrated to 24lb injectors and the options they give me are 80mm Lightning, 90mm Lightning, SCT BA2400, SCT BA2600, SCT BA2800, SCT BA3000 and SCT BA5000. I'm almost positive its not one of the SCT's but I have been wrong a time or two :P thanks for your input!

 

The stock '97 Cobra MAF is 80mm, the same as your stock '02 MAF; in fact they have identical transfer functions as shown below (these were pulled from a stock '97 Cobra and a stock 2002 tune):



They both max out at 2600 lb/h which is enough to support over 400fwHP running n/a.

Also, other than those after market MAFs sold as "calibrated" are tied to any specific injector size; and those are a kludge left over from the past when tunes could not be easily, or even at all, reprogrammed.

"Calibrated" MAFs have had their transfer function jimmied up so that different injectors (usually higher capacity) can be used with a specific stock tune. They are not calibrated to just an injector size, but to an injector size and a particular stock tune.

There is no need to use one on our cars, and in fact 99.44% of the time they create numerous tuning problems including screwing up the PCM's load calculation which is the basis for all timing and fueling control settings.

Once a so-called calibrated MAF is used on a engine/tune for which it was not "calibrated" all it is is a MAF with an unknown and oddly shaped transfer curve.

 

ok so could i just use the 90mm MAF i have on there now or would it not work with the larger injectors?

 

What 90mm MAF? Is what you referred to as a "97 Cobra MAF" not a stock '97 Cobra unit?

There's nothing about your setup that requires a MAF any larger than the stock one that came with your car...

 

an intake i bought came w/ a 90mm lightening MAF. would that work w/ the injectors if i got my tuner reprogramed for it?

 

when i bought the injectors, they came with the cobra maf

 

OK let's back up;

So far this MAF has been described as:

• a "MAF"..."off a 1997 Cobra", "an 85mm calibrated to 24lb injectors";
• a 90mm MAF of unspecified origin;
• a "90mm Lightning MAF";
• a "cobra MAF";

Which is it?

The '97 Cobra came with an 80mm MAF very much like that which came on your '02 GT.

The Ford Lightning is an F-150 pick-up truck--most definitely NOT a Cobra (though it did share many components)...

 

ok, i have 2 mafs. one: 90mm ford racing maf. on the car now.
two: 1997 cobra maf that came with the injectors currently unistalled. the guy i bought it off of said it was from a 97 cobra and was calibrated to 24lb injectors. he just threw it in w/ the injectors because it was no use to him.

 

Well that explains the confusion--it would have been helpful to know that right up front...

Is number two "from" a '97 Cobra, in which case it could be a "calibrated" MAF, or IS it a "'97 Cobra MAF"?

If it is a stock '97 Cobra MAF it is nearly identical to your stock 2002 MAF, if it's some after market "calibrated" thing throw it away (as the seller did) and concentrate on the FRPP 90mm unit.

The 90mm FRPP unit is still too big for your car (if you have the stock MAF just use that), yet if you insist then just tell the mail-order tune people that's what you have--they'll be able to figure it out...

 

sorry for the confusion..i should have been more specific. ill get rid of the cobra maf and just use my FFRP maf. thanks alot for your help and patience man!