A9L ecm

seanmouth · June 29th, 2009, 01:12 PM

can anyone tell me the difference between computers like the a9L/a9m and what are the best ones for a mass air conversion on an 88 notchback?

93hatch · June 29th, 2009, 01:40 PM

a9l is supposed to have slightly more aggresive timing curves, when i pulled my chipped a9l out to sell it and threw in an a9p or a9s (cant remember) car idled better than ever, dont jump on the a9l bandwagon

flyin ryan · June 29th, 2009, 02:15 PM

one's for manual and one's for auto.. the manual a9l has slightly more aggressive timing then the a9p like mentioned above.

ryans88gt · June 29th, 2009, 02:39 PM

There are several different computers A9L, A9P, A9M. The A9L is probably the best as far as the tune they come with. Both physically I don't think there is any difference.

1slo5.0 · June 29th, 2009, 05:18 PM

Originally Posted by 93hatch

a9l is supposed to have slightly more aggresive timing curves, when i pulled my chipped a9l out to sell it and threw in an a9p or a9s (cant remember) car idled better than ever, dont jump on the a9l bandwagon

Your problem was either the chip or the computer was bad. The idle problem was cured because you eliminated a fault, not because you eliminated the A9L.

93hatch · June 29th, 2009, 05:29 PM

Originally Posted by 1slo5.0

Your problem was either the chip or the computer was bad. The idle problem was cured because you eliminated a fault, not because you eliminated the A9L.

i still dont know what was up, the idle surged all the time but i think it was in the chip too

91Project · June 29th, 2009, 06:10 PM

With an auto computer you will have to manually override the reverse lockout, but you lose the rev limiter as well. Are the tunes really different between the auto and manual computer? I was unaware of that...

1slo5.0 · June 29th, 2009, 06:58 PM

Originally Posted by 91Project

With an auto computer you will have to manually override the reverse lockout, but you lose the rev limiter as well. Are the tunes really different between the auto and manual computer? I was unaware of that...

I've heard that about the rev limiter before but I have not seen anything physically proving that. All of the documentation and tables I find show all Mustang computers with a 6250 rev limit. I had a 91 GT convertible that rev limited around 6200 just like all of my 5 speed cars did. I suppose it could have been valve float too. Who knows.

91Project · June 30th, 2009, 09:59 AM

Originally Posted by 1slo5.0

I've heard that about the rev limiter before but I have not seen anything physically proving that. All of the documentation and tables I find show all Mustang computers with a 6250 rev limit. I had a 91 GT convertible that rev limited around 6200 just like all of my 5 speed cars did. I suppose it could have been valve float too. Who knows.

I know, it was from me about a month or so ago. I will do some digging and see if I can find the data that I got that from. Or someone with an auto computer in their swapped manual can hold it to the floor and see how high they can get the RPMs

June 29th, 2009, 01:12 PM	#1
seanmouth Newbie 1988 mustang ssp Join Date: May 2008 Location: medford, oregon Posts: 27 iTrader: 0 reviews	A9L ecm can anyone tell me the difference between computers like the a9L/a9m and what are the best ones for a mass air conversion on an 88 notchback?

June 29th, 2009, 01:40 PM	#2
93hatch Banned 1992 Lx 11.39@119.24 Join Date: Jan 2008 Location: Az Posts: 11,665 iTrader: 0 reviews	a9l is supposed to have slightly more aggresive timing curves, when i pulled my chipped a9l out to sell it and threw in an a9p or a9s (cant remember) car idled better than ever, dont jump on the a9l bandwagon __________________ [QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]

June 29th, 2009, 02:39 PM	#4
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,627 iTrader: 0 reviews	There are several different computers A9L, A9P, A9M. The A9L is probably the best as far as the tune they come with. Both physically I don't think there is any difference. __________________ 88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

June 29th, 2009, 06:10 PM	#7
91Project Regular 1991 Mustang GT Join Date: Mar 2009 Posts: 144 iTrader: 0 reviews	With an auto computer you will have to manually override the reverse lockout, but you lose the rev limiter as well. Are the tunes really different between the auto and manual computer? I was unaware of that... __________________ AutoMeter C2 Nitrous Guage FS PM for details

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June 29th, 2009, 02:15 PM	#3
flyin ryan Banned Join Date: Jun 2008 Posts: 3,387 iTrader: 0 reviews	one's for manual and one's for auto.. the manual a9l has slightly more aggressive timing then the a9p like mentioned above.

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