I read your reply to my other post. You stated there, as other places about MAF function, and proper calibrations. What do you know about replacement meters? To be more specific, like changing out a stock meter for say a Pro-flow that is still cailbrated to the stock injector size and a stock application.

Are you saying they would function similar to a meter calibrated for larger injector size, only not as big a change? Still add timing and change fuel curves?by allowing more air with less voltage.

I was given a Pro-flow ( have one on the Stang for the 30lber's) calibrated for stock 4.6-5.4 truck applications. I was curious about its function and called pro-flo. The Tech told me the only difference in the "stock" and "cold Air" calibrations(they sell a stock and cold air kit model) was that when it is tested/cailbrated they use and open element and elbow to simulate a intake kit. They still operate a span of 5 volts.
He also told me that adding any performance chips or tuners would be ok. If I remember right you said that these MAF's often time add timing and less fuel as explained in the other post.
The Tech also said that the meter doesn't require any added octane, as it doesn't affect transfer ****ions.

As you know, I don't listen to anyone and just take their word, I like to gather as much information as I can, and draw my own conclusions.

I know you are quite knowlegeable, whats better is your experiance. I'd like to pick your brain for info. I installed the meter, I noticed a little change, however my mileage has taken a big jump. I am currently using it with the 87 octane program, and want to try it with the high performance tune.

So if you don't mind professor(I mean that as a compliment) class is session, tell me all you know about MAF's. Your experiances. I'd be happy to call if its too much to go over here, please just let me know.
What is a stock truck MAF good for CFM wise? Thank You

 

Hi John,

Generally speaking, you've basically nailed it on the head - when using an aftermarket MAF (anyones) cal'd for stock injectors, the loading usually (though not always, they are inconsistent) isn't off quite as far as it is when that aftermarket MAF is cal'd for a larger-than-stock injector size.

However - we still do not recommend running *any* aftermarket MAF on the stock factory tune of any FoMoCo vehicle, and certainly not in conjunction with a "performance" tune that still has the stock factory MAF's transfer function. Do some datalogging & you'll see what I mean - just look at this fuel trims in closed loop, and then look at the open loop A/F (wideband O2 of course) compared to what's being commanded in the base fuel table - you're still leaner than commanded, and usually more timing is present, too. Some tuners "tune around" those kinds of things, but I hate doing that - I much prefer to have the system working *properly*, so you're actually getting what you're commanding.

We currently supply anyone wanting to upgrade the MAF on their F-150 with the 90mm Lightning MAF for applications not exceeding about 600 HP (flywheel), and only go aftermarket on the MAF when the CFM demand of the motor actually requires more than the Ford 90mm unit can reliably supply. The Ford 90mm piece is so consistent in it's calibration that we can put a new transfer function in there by "mail order" and have it run very well, without worrying about it being too lean or causing too much timing, etc (and no, for others reading this, that does not mean you can just bolt on a 90mm Ford MAF with any injector size and have it run right - the tuning will still need to be altered any time the MAF is changed).

We respect Jim over at Pro-M, he's a great guy to work with, their products are generally good quality and they're good people that we think highly of. It's just that with any aftermarket MAF, no matter what injector size it's cal'd to, we still have to have full data acquisition in order to develop the new transfer function, so we're getting what we're commanding - the fuel trims aren't skewed in C/L and we get the approximate A/F being commanded in O/L.

I heard that Pro-M has been working on a software package so we can take their flow sheets and with that data and the new software, do the math required to develop an appropriate *baseline* transfer function in the tuning, but I don't know what the projected ETA is.

 

This is okladrop I also put a Granatille MAF on my 97 F-150 do I need to buy a Programer for my truck, and if so what make or brand?

 

you reported in the first post that you were using 87 program. are you using the 1715? and just how much of a difference did you notice? your milage went up, what was it prior to install and after?

thanks, Randy

 

I noticed an increase in mileage with the MAF install and the 87 program(1715). I've had the 87 program installed since January.
To be fair I can't say what kind of mileage could be had with both the MAF and a performance tune, as I needed to return the MAF to the owner he is selling it as part of a deal, including Exhaust, brake parts, TB spacer, flip-chip....etc.

If your question is bettering your mileage with a 1715, don't concern yourself with that. You will be so pleased with the shifting that any increase is just an extra bonus. I would think it would add something to mileage just by means of better shifting alone.

The same gains may be had with one of the performance programs, that could be possible as well with tha added timing and optimum A/F ratios.

I got my tuner in Oct. Its hard to run a full tank of gas under the same conditions, then change something and try to see how it effects mileage. Winter gas is blended different, cold temps. Its impossible to duplicate exact conditions to see what changes happen.

I did notice a 2mgp jump right away with the MAF. however we are just getting into warmer weather, and spring /summer blended fuels. Also here in CT we just got rid of MTBE, and are using 10% methanol. Winter it is typical to see a 10% drop in MPG.
So again too many variables to say.
This is why I asked Mike his experiances, and talked to Pro-flow.
Was it the MAF? a combination factors?
I don't know to be sure.

I'm tring to get the most I can and am currently running some tests. For fuel mileage, Electric Fans I have the Flex-a-lite kit, Plasma booster and a tuner would be you best bet.

 

Hi Okladrop,

Welcome to F-150 Online!

To answer your question, yes, we *do* recommend having a custom tune done any time you change the MAF, whether you are using an aftermarket MAF (Pro-M, Granatelli, C&L, etc.) like you have there, or whether you upgrade to Ford's larger 90mm MAF from the 2001 & up Lightnings. So yes, because you have installed a Granatelli MAF, your vehicle does need a custom tune with a new transfer function if you are going to continue using that aftermarket MAF.

Adding an aftermarket MAF causes your engine to run leaner (just like adding a Pro-M or a Ford 90mm unit would, it's not just Granatelli), and has also caused the PCM to add too much timing, because the base loading is off (from the different MAF) - so it pulls from too low in the load (spark) tables. This is why you usually see a gain in mpg and power on a basically stock or lightly modified vehicle from those larger MAF's - not because the engine actually needed a physically larger MAF.

Most late-model V8 F-150's already have an 80mm MAF stock, that will support an easy 325+ flywheel HP and a bit more. It's at about the 300+ HP level that you can start to see some decent benefit (more HP at higher rpms) from putting a larger MAF on there - and of course, custom tuning is required to dial in that different MAF.

To answer your questions about "which" chip or tuning product to go with, we can do the custom tuning needed for that Granatelli MAF either in a traditional "chip" or a hand-held Micro Tuner - whichever you prefer. Most people go with the custom 9100 Micro tuner, as it will have 3 different custom tunes, a built-in OBD-II code scanner and a simple plug-n-play 10 minute installation. You can take a look on our web site at this link: http://www.troyerperformance.com/cgi...chips%3BFoMoCo

There are 3 different products we can do the custom tuning for your MAF in, which are Part# 5500, Part# 6600, and then Part# 9100. And of course, you'll also see some very nice additional gains in power and performance in your truck, as well as the top speed limiter being removed, and all the other benefits, etc.

Give us a call at our number listed below when you get a chance to go over this in proper detail, find out the costs, results, additional power gains, and all the other details you'll probably want to know about before making your decision.

Good luck with your truck!