Marauder Tuning

[MitchB]

Some of you have the SCT pro racer's package? Have you done anything with the MAF? The factory MAF curve has poorly distributed calibration points and the adaptive fuel table is calibrated to learn at just a few points on this curve. I rewrote the curve and cal'd the adaptive table to learn at all points.

Here's a comparison between the factory MAF curve and the one I constructed.

Mitch

[Blackened300a]

Umm Looks More Gooder to me. Is this done through the tune or a new MAF would need to be installed? :dunno:

[MitchB]

Umm Looks More Gooder to me. Is this done through the tune or a new MAF would need to be installed? :dunno:

The new curve is for the stock MAF. The curve is more accurate because the calibration points are more evenly distributed.

Mitch

[Hotrauder]

Some of you have the SCT pro racer's package? Have you done anything with the MAF? The factory MAF curve has poorly distributed calibration points and the adaptive fuel table is calibrated to learn at just a few points on this curve. I rewrote the curve and cal'd the adaptive table to learn at all points.

Here's a comparison between the factory MAF curve and the one I constructed.

Mitch
I think I understand the concept but beyond that is a mystery. Anyone have time and patience enough to explain to this newbie? Thanks. My DTR was under excellent foster care by member Al Gogeun before adoption recently. It has a SCT 9100 tuner, 4.10's, UP's, rear sway bar, flowmaster 40's and 180 Stat and plugs among other STUFF Al had upgraded the car with. I have added a CAI (hense my interest in effect on MAF?) and some other bling. Any help would be appreciated. Many thanks Dennis :help:

[Al Goguen]

I think I understand the concept but beyond that is a mystery. Anyone have time and patience enough to explain to this newbie? Thanks. My DTR was under excellent foster care by member Al Gogeun before adoption recently. It has a SCT 9100 tuner, 4.10's, UP's, rear sway bar, flowmaster 40's and 180 Stat and plugs among other STUFF Al had upgraded the car with. I have added a CAI (hense my interest in effect on MAF?) and some other bling. Any help would be appreciated. Many thanks Dennis :help:

Hey Dennis! Way to go... Next a Supercharger????? LOL It would make
a big difference.:banana2:

[Dennis Reinhart]

Some of you have the SCT pro racer's package? Have you done anything with the MAF? The factory MAF curve has poorly distributed calibration points and the adaptive fuel table is calibrated to learn at just a few points on this curve. I rewrote the curve and cal'd the adaptive table to learn at all points.

Here's a comparison between the factory MAF curve and the one I constructed.

MitchMitch the most critical part of the tune is Mas air flow transfer function, the only time this is changed is to correct air fuel when the adaptive learning is turned off, and you are monitoring and or graphing AF.

The function you are using changes Maf counts, as well as #MIN normally during tuning you calculate the changes needed to correct AF in the #MIN Once air fuel is corrected adaptive is turned back on, and the EEC will learn on its own as long as you have the AF relatively close.

This graph actually helps confirms that the the #Min is linear. Now unless you are mapping AF with a wide band, you can make a serious mistake if you lean the car out you will destroy the engine, the same thing can happen if the car is to rich then you will wash the oil out of the rings causing premature piston wear and scuffing.

The stock marauder Mas air flow transfer rarely needs much adjustment unless the car is SC or has a cold air kit on it, other than that I would leave it alone unless the car was on a Dyno mapping AF, yes a stock Marauder transfer function can be leaned and the car can gain power since the function is richer set by the factory so again tuning is a wonderful thing.

[MitchB]

After writing the new MAF curve, I datalogged A/F with a wideband (adaptive off) to get things close. Then with the adaptive fuel table recalled to learn at all points, I looked at the long term fuel trims. Last I looked, the max trim anywhere on the curve was less than 3% and closer to 1% at most points.

The reason for reconstructing the curve is to get the calibration points more evenly distributed. This gives greater accuracy rather than having groups of points clustered in a few places. This is not mandatory, but ultimately gives better resolution.

Mitch

[Hotrauder]

Hey Dennis! Way to go... Next a Supercharger????? LOL It would make
a big difference.:banana2:Al, I am really enjoying the car. Hope you like the GT as well. I am really tempted by the Labor Day Deal SC deal that Greg has but am hesitant as I don't as yet know enough about any of this STUFF. I guess I will keep reading for awhile? :help: Dennis

[Dennis Reinhart]

Al, I am really enjoying the car. Hope you like the GT as well. I am really tempted by the Labor Day Deal SC deal that Eric has but am hesitant as I don't as yet know enough about any of this STUFF. I will keep reading! :help: Dennis
Well I will help any way I can why not give me a call Tuesday.

[Hotrauder]

Well I will help any way I can why not give me a call Tuesday.<!-- / message --><!-- sig -->

__________________
Dennis

Hello, I would be grateful for a chance to bounce this around a little. Thanks, Dennis. I have learned a lot from your many informative posts and with a little background I may even eventually understand what I know. :bows:

[metroplex]

I have the 03 Marauder air intake box assembly and I don't think the low end was tuned for a 00 Crown Vic.

I'm interested in adjusting the MAF for more efficient operation at zero to light/part throttle.