A9L vs. A9P whats the diff?

NewAge 5.0 · 11-25-2002, 12:31 AM

I think the A9P is for automatic cars.. but not sure.

heres the deal, my car hasnt performed right since I built the engine. It pops back, has a "power band feel" and only ran 106 mph in the 1/4 its a 5 speed and its a 306 w/stock Performer Rpm's 2.02 valves. Lunati 51025 cam stock Gt40 75mm bullet 24# injectors 1" spacer .. when I had my heater core put in my buddy noticed the computer had a HUGE stick that said REMANUFACTURED could this be my problem.. the car drives good just doesnt perform like it should. I have a A9P should I try it or not worth the effort?

Smokedawg · 11-25-2002, 10:09 AM

The A9P is for a auto. They run a little more aggressive than other computers. I run one in my car.

WADS56 · 11-25-2002, 12:48 PM

Quote:

Originally posted by Smokedawg
The A9P is for a auto. They run a little more aggressive than other computers. I run one in my car.

I think that the A9L has the best timing and fuel tables. The A9L is the computer that everyone wants. If there is a difference in performance I can't see it being much.

Wade

USMC302 · 11-25-2002, 12:58 PM

PKRWD posted the list of ECM's out there from best to worst and the A9L was at the top.

Smokedawg · 11-25-2002, 01:13 PM

I don't know how reputable it is but I have heard that A9P's have more spark and fuel than the A9L's. In a recent magazine when the talked about the history of the 5.0 they were saying "at this time the hot combo was" blah and an A9P to add more fuel. They didn't mention the spark, but I have heard that elsewhere.

In '89 ford wanted the mustang to be able to compete with the other manufactures in racing. to make the automatic as agressive as the manuel it had a beefed up computer that shifted faster and something else that escapes me. i know thats why people want the 89 up auto computers.

I have tried both the A9P and A9L and noticed NO difference

Coolbreeze · 11-25-2002, 04:21 PM

I've heard the same as Smokedawg, that them A9P's have alittle more aggressive tuning due to the auto's. But as far as performance I really haven't seen a difference. On a buddies 4-8 conversion he startes out with an A9P and switched to an A9L and to be honest we didn't notice a difference between the 2...

Mach 1 · 11-25-2002, 11:59 PM

Quote:

Originally posted by Smokedawg

to make the automatic as agressive as the manuel it had a beefed up computer that shifted faster and something else that escapes me. i know thats why people want the 89 up auto computers.

The automatic computer had nothing to do with shifting in the pre -94 mustangs.

Smokedawg · 11-26-2002, 06:40 PM

Quote:

Originally posted by Mach 1
The automatic computer had nothing to do with shifting in the pre -94 mustangs.

So are you saying someone with a auto tranny can run a A9L?

Mach 1 · 11-26-2002, 06:50 PM

I believe so. There are some minor differences, but transmission shifting isnt one of them. The AOD up to 1993 is mechanically shifted with no input from any computer.

Mustang_GT_90 · 11-26-2002, 07:32 PM

From what I've heard the difference between the two is just the spark curve. I know you can put an auto computer in a 5 speed car, a friend of mine did it. They say it's supposed to help it out and make it quicker but he didn't see a gain.

USMC302 · 11-26-2002, 09:12 PM

Yes you can put a auto computer into a 5 speed car, but DO NOT put a 5 speed into an auto unless you cut and disconnect the wire on pin 30 on the 60 pin connector. I did this and it fried the ECM immediately.

11-25-2002, 12:31 AM	#1
NewAge 5.0 Registered Member Join Date: Mar 1999 Location: Sanford NC USA Posts: 155	A9L vs. A9P whats the diff? I think the A9P is for automatic cars.. but not sure. heres the deal, my car hasnt performed right since I built the engine. It pops back, has a "power band feel" and only ran 106 mph in the 1/4 its a 5 speed and its a 306 w/stock Performer Rpm's 2.02 valves. Lunati 51025 cam stock Gt40 75mm bullet 24# injectors 1" spacer .. when I had my heater core put in my buddy noticed the computer had a HUGE stick that said REMANUFACTURED could this be my problem.. the car drives good just doesnt perform like it should. I have a A9P should I try it or not worth the effort? __________________ 88 Hatch 10.60's @ 130 89 Hatch Not as fast but holds its own

11-25-2002, 10:09 AM	#2
Smokedawg Tires Fear Me... Join Date: Jan 2001 Posts: 867	The A9P is for a auto. They run a little more aggressive than other computers. I run one in my car. __________________ 1990 Mustang GT- 347 Stroker-Tremec 3550-Compucar Nitrous, AFR, Systemax Intake, AFM, 30lbers, 70MM TB, 76mm MAF, full suspension and lots more 1995 Chevy S-10 406 SBC, Dual tunnel ram, Dart heads, Nitrous, full tub, 4-link, adjustable drag shocks, coil-overs, 9in rearend, 4.56 gears...etc

11-25-2002, 12:58 PM	#4
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	PKRWD posted the list of ECM's out there from best to worst and the A9L was at the top. __________________

11-25-2002, 01:13 PM	#5
Smokedawg Tires Fear Me... Join Date: Jan 2001 Posts: 867	I don't know how reputable it is but I have heard that A9P's have more spark and fuel than the A9L's. In a recent magazine when the talked about the history of the 5.0 they were saying "at this time the hot combo was" blah and an A9P to add more fuel. They didn't mention the spark, but I have heard that elsewhere. In '89 ford wanted the mustang to be able to compete with the other manufactures in racing. to make the automatic as agressive as the manuel it had a beefed up computer that shifted faster and something else that escapes me. i know thats why people want the 89 up auto computers. I have tried both the A9P and A9L and noticed NO difference __________________ 1990 Mustang GT- 347 Stroker-Tremec 3550-Compucar Nitrous, AFR, Systemax Intake, AFM, 30lbers, 70MM TB, 76mm MAF, full suspension and lots more 1995 Chevy S-10 406 SBC, Dual tunnel ram, Dart heads, Nitrous, full tub, 4-link, adjustable drag shocks, coil-overs, 9in rearend, 4.56 gears...etc Last edited by Smokedawg; 11-25-2002 at 01:20 PM..

11-25-2002, 04:21 PM	#6
Coolbreeze Registered Member Join Date: Oct 2000 Location: ~Columbus~GA~31909~ Posts: 156	I've heard the same as Smokedawg, that them A9P's have alittle more aggressive tuning due to the auto's. But as far as performance I really haven't seen a difference. On a buddies 4-8 conversion he startes out with an A9P and switched to an A9L and to be honest we didn't notice a difference between the 2... __________________ Mike Blown~AOD'ed~331~ T-top~ 86GT Check out car on my page here ------ > ~~My 86GT T-top ~~

11-26-2002, 06:50 PM	#9
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	I believe so. There are some minor differences, but transmission shifting isnt one of them. The AOD up to 1993 is mechanically shifted with no input from any computer. __________________ 2002 GT 1993 GT (SOLD) '93 Mustang GT RHC member #142

11-26-2002, 07:32 PM	#10
Mustang_GT_90 Registered Member Join Date: Apr 2002 Posts: 68	From what I've heard the difference between the two is just the spark curve. I know you can put an auto computer in a 5 speed car, a friend of mine did it. They say it's supposed to help it out and make it quicker but he didn't see a gain. __________________ 90 Mustang, full weight, 5 speed, pulleys, 3.73 gears... 13.33@101 mph on stock motor and DOT's 12.44@112.5 on the juice. Check out our clubs website at http://www.stanggang.com

11-26-2002, 09:12 PM	#11
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	Yes you can put a auto computer into a 5 speed car, but DO NOT put a 5 speed into an auto unless you cut and disconnect the wire on pin 30 on the 60 pin connector. I did this and it fried the ECM immediately. __________________

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