Tuning maf

Anything about Ford EEC tuning. TwEECer and Moates questions dominate, but there's some SCT and OBD-II knowledge too.

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brewster
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Tuning maf

Post by brewster » Mon May 20, 2019 7:03 pm

Just curious but if your receiving voltages that are super close to what your transfer is reading is it proper to enter the voltages into the columns as well as air flow to help smooth it all out. I noticed if I have the volts to close together it was hunting.
1992 Fox A9L GUFB slot maf 347 heads cam, holley systemax, long tubes, some squeeze and a bunch of shiny stuff

brewster
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Posts: 53
Joined: Sun Aug 22, 2010 4:43 pm

Re: Tuning maf

Post by brewster » Mon May 20, 2019 7:09 pm

I meant to say reading volts that are different then what's in the transfer by .5 volt or so, is it best to dial in volts and air flow also
1992 Fox A9L GUFB slot maf 347 heads cam, holley systemax, long tubes, some squeeze and a bunch of shiny stuff

A6intruder
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Re: Tuning maf

Post by A6intruder » Tue May 21, 2019 9:04 pm

Once you have created the 30 point curve to work in your software just change the airflow values. You certainly could change the voltage but I don't know why that would be any advantage.

Dan Nicoson
Dan Nicoson
1994 Mustang GT, CHP 331 forged crank bottom end, single Holset HX35W turbo, AFR 165 heads, TF Intake, "Baby" Crower cam with Beehive springs, TwEECer using BE and DataQ data logger

brewster
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Posts: 53
Joined: Sun Aug 22, 2010 4:43 pm

Re: Tuning maf

Post by brewster » Tue May 21, 2019 10:03 pm

I noticed the voltage curve for my slot maf in the diameter of pipe I'm using wasnt quite on par with the actual voltage reading I'm getting while datalogging. At idle its reading 1.05-1.15v and my curve shows the 2 closest volt points to be .98-1.19v. I'm sure the editor knows to reference those 2 points just wasnt sure if it would be better to have those volt points a little more accurate. I may be out to lunch was just a thought. Either way the ecu obviously knows what volt point to reference being close enough ?
1992 Fox A9L GUFB slot maf 347 heads cam, holley systemax, long tubes, some squeeze and a bunch of shiny stuff

A6intruder
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Re: Tuning maf

Post by A6intruder » Wed May 22, 2019 9:14 am

The EEC processor does mathematic interpolation on the MAF function with all the accuracy that is needed. I wouldn't overthink this part of your tune.

Basic question: How does it run / idle?

If run / idle OK, good. If it doesn't run / idle well - the voltage points are not your problem.
Dan Nicoson
1994 Mustang GT, CHP 331 forged crank bottom end, single Holset HX35W turbo, AFR 165 heads, TF Intake, "Baby" Crower cam with Beehive springs, TwEECer using BE and DataQ data logger

brewster
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Posts: 53
Joined: Sun Aug 22, 2010 4:43 pm

Re: Tuning maf

Post by brewster » Sun Jun 23, 2019 7:05 pm

Thanks for the reply, It runs and idles pretty good but not as good as I want it to. I feel like my injector settings are off.
1992 Fox A9L GUFB slot maf 347 heads cam, holley systemax, long tubes, some squeeze and a bunch of shiny stuff

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