A9L - A9P which ECU's are for what

Busted07 · Mar 8, 2006

A friend of mine has a 90 Gt with a 302, and someone told him that he could switch out his computer for one from a different model/year and net gains. i told him to rip it all out an use a carb, but he wouldnt listen.. anyone have any insight on this? I know that the one i took out of mine was an A9L, and i just happened to notice it when i put it on ebay. so im guessing he has an A9L as well for his 90 Gt.. please let me know what ya think

jrichker · Mar 8, 2006

A9L - 89-93 5.0L Mustang 5-spd
A3M - 93 5.0L Mustang 5-spd
A3M1 - 93 5.0L Mustang 5-spd
X3Z - 93 5.0L Cobra 5-spd
A9P - 89-93 5.0L Mustang Auto
A9S - 88-93 5.0L Mustang California
C3W - 89-93 5.0L Mustang Auto
DA1 - 87 5.0L Mustang 5-spd
J4J1 - 94-95 5.0L SVT Cobra 5-spd
T4M0 - 94-95 5.0L GT Vert 5-spd
U4P0 - 94-95 5.0L GT Auto
W4H0 - 94-95 5.0L GT
ZA0 - 95 Cobra R
D9S - Lincoln LSC

Busted07 · Mar 8, 2006

Thanks for the info J, I really appreciate it!

does anyone know if there are any benefits from swapping 1 computer to the other? what i mean is do some computers that could swap into a 90 GT contain better fuel maps or anything like that?

04sleeper · Mar 8, 2006

FarBeyondDriven said:
does anyone know if there are any benefits from swapping 1 computer to the other? what i mean is do some computers that could swap into a 90 GT contain better fuel maps or anything like that?

Well if it is a 5 speed and has an A9L then you could switch to an A9P.

They are known to have a slightly more agressive timing curve.

You can use an A9P computer in an Auto or 5 speed but you can olny use an A9L in a 5 speed. It will not work with an auto.

Hope this helps.

88_GT_5_oh · Mar 8, 2006

you know what. before when i was looking at doing a mass air conversion EVERYONE told me to do a A9L, now after the fact everyone is saying the A9P is better.... wtf mate?

88_GT_5_oh · Mar 8, 2006

heres the thread i made too

http://forums.stangnet.com/showthread.php?t=482320

even "jrichker" said that a A9P will work in a "pinch", no one was ever saying back then that the a9p was better, just that it would work

04sleeper · Mar 8, 2006

88_GT_5_oh said:
you know what. before when i was looking at doing a mass air conversion EVERYONE told me to do a A9L, now after the fact everyone is saying the A9P is better.... wtf mate?

A9P is not necessarily better, it depends on the setup.

With your setup it will be just fine. Your car will require tuning and a chip/tuner anyway, so it doesn't really matter in your case. Also the A9L is the most comon, so getting a tuner or chip to work with it is easy.

88_GT_5_oh · Mar 8, 2006

ya, i know i have a PMS anyway now but its just frustrating that like 1.5 years ago people here were all saying to go with a A9L no matter what (i can't find any other threads now) back wheni was a noob... hell who am i kidding i am still a noob

04sleeper · Mar 8, 2006

88_GT_5_oh said:
ya, i know i have a PMS anyway now but its just frustrating that like 1.5 years ago people here were all saying to go with a A9L no matter what (i can't find any other threads now) back wheni was a noob... hell who am i kidding i am still a noob

I hear you.

And with a Turbo'ed Mustang and using a PMS I wouldn't say you are a noob.

88_GT_5_oh · Mar 9, 2006

i will forever be a noob lol

A9L - A9P which ECU's are for what

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