A9L work with an auto???
09-18-2008, 04:47 PM
#1
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Posts: 229
A9L work with an auto???
I have the opportunity to purchase an A9L computer (for use with manual tranny) for my '88 5.0 with an auto. Some day I will swap to a manual, but in the meantime, will the 5-speed computer work on my auto??? I've tried doing the research, but I haven't found anything.
09-18-2008, 09:04 PM
#3
3rd Gear Member
Join Date: Nov 2007
Location: Washington, Seattle
Posts: 551
*sigh*
The Fox eec-iv ecu's don't control the trans.
The A9L and A9P have a little different timing and fuel, but they're basically the same thing.
You can swap them. Many folks have done it.
jason
The Fox eec-iv ecu's don't control the trans.
The A9L and A9P have a little different timing and fuel, but they're basically the same thing.
You can swap them. Many folks have done it.
jason
09-18-2008, 11:24 PM
#6
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Join Date: Jul 2003
Location: United States
Posts: 3,451
An auto will work with an a9l. The a9p from what i've noticed will idle higher for about 30 seconds when first started up & won't drop down to idle rpm right after shifting to neutral. I'm not aware why, my best guess would be to get fluid warmed up somewhat during initial startup & to keep the engine from dying.
I've heard from many people the ignition curve is different, but I haven't seen both maps to compare. I have the a9l map.
I've heard from many people the ignition curve is different, but I haven't seen both maps to compare. I have the a9l map.
09-19-2008, 01:24 AM
#7
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Join Date: Nov 2007
Location: Washington, Seattle
Posts: 551
What you are saying is an internet myth, and not based in reality.
The Fox eec-iv does not control anything on the AOD... NOTHING.
You guys are confusing an AOD with an AODE.
An AOD does not require anything from the ecu.
A9L & A9P can be swapped.
09-19-2008, 01:26 AM
#8
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Join Date: Nov 2007
Location: Washington, Seattle
Posts: 551
I posted the results on the following site...
http://tinyurl.com/Compare-A9L-A9P-X3Z
jason
09-19-2008, 07:55 AM
#9
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Join Date: Jul 2003
Location: United States
Posts: 3,451
might as well post so everyone can see. The higher timing at low rpm would explain why it idled higher
A 3-way Comparison of Ford EEC-IV Computers: A9L, A9P, X3Z
WOT Spark Advance vs. RPM – FN131
A9L
RPM_____0____0____1,000___1,800___2,150___2,600___ 3,500___5,000___16,384
Degrees___8____8_____8______18.5____21.5____22.5__ ___22______25_____25
A9P
RPM______0____0____0______1,600___2,250____2,600__ _3,500___5,000___16,384
Degrees___18____18____18_____18______22______23___ ___22______26______26
X3Z
RPM_____0____0____1,000___1,800___2,150___2,600___ 3,500___5,000___16,384
Degrees___8____8_____8______18.5____21.5____22.5__ ___22______25_____25
In FN131 (WOT vs. RPM), notice that the A9P does add 10* of advance at lower WOT rpm's. If proper gearing is being selected by the driver, then a manual t5 Mustang should not see WOT below 1,600 rpm. For this reason using an A9P in a t5 Mustang will provide minimal performance gain due to ignition timing advance.
Most likely Ford used the extra 10* of advance in the A9P to help ‘off the line’ performance in the automatic Mustang. Using an A9L in an automatic equipped Mustang would sacrifice this added timing. This is why an A9L is not recommended for AOD equipped Mustangs.
Below are a couple more WOT Ignition Timing tables. The influence of these tables will be less significant than FN131, as the following tables are ‘Adders’ to Total Ignition Timing.
As ‘Adders’ the following values are added to the WOT table, to arrive at Total Ignition Timing. For example, in an A9L at WOT, ECT at 246F, and 5,000rpm the total timing will be (25* - 4*) 21*.
Also, it should be noted that the computer assumes the distributor is always set at the stock 10* ignition advance setting. For example, advancing the distributor from the factory 10* of advance to 14* will add an additional 4* to the total timing.
Using the same example from above, this will return the total timing to 25* (making up for the 4* of retard from FN134 at an ECT of 246F).
WOT Spark Advance vs. ECT – FN134
A9L
ECT_____-256____86____120___200___236___246___254
Degrees____3_____3______0_____0____-2_____-4____-4
A9P
ECT_____-256____86____120___200___236___246___254
Degrees____3_____3______0_____0____-2_____-4____-4
X3Z
ECT_____-256____86____120___210___236___244___254
Degrees____3_____3______2_____0____-2_____-4____-4
WOT Spark Advance vs. ACT – FN135
A9L
ACT_____-256____-256____-256___-256___150___240___254
Degrees____0______0_______0______0_____0_____-6____-6
A9P
ACT_____-256____-256____-256___-256___150___240___254
Degrees____0______0_______0______0_____0_____-6____-6
X3Z
ACT_____-256____-256____-256___-256___160___240___254
Degrees____0______0_______0______0_____0_____-6____-6
WOT Spark Advance vs. BP – FN133
A9L
BP_______0____23.5____26.5___27.75___31.875
Degrees__12_____4_______4______0______0
A9P
BP_______0____23.5____26.5___27.75___31.875
Degrees__12_____4_______4______0______0
X3Z
BP_______0____23.5____26.5___27.75___31.875
Degrees__12_____6_______5______0______0
Now some of the Part Throttle Ignition Timing Tables
Spark Table Base – FN901
The computer always assumes the base ignition timing to be set at 10* of advance.
Thus, this Table includes the factory 10* of the base timing set at the distributor. For example, an A9L with 14* set at the distributor will see 25* at 75% load and 4,000rpm (21* in the table, plus 4* over the initial of 10* = 25*). Likewise, an A9L with 10* set at the distributor will see 21* at the same load/rpm.
WOT Spark Advance vs. RPM – FN131
A9L
RPM_____0____0____1,000___1,800___2,150___2,600___ 3,500___5,000___16,384
Degrees___8____8_____8______18.5____21.5____22.5__ ___22______25_____25
A9P
RPM______0____0____0______1,600___2,250____2,600__ _3,500___5,000___16,384
Degrees___18____18____18_____18______22______23___ ___22______26______26
X3Z
RPM_____0____0____1,000___1,800___2,150___2,600___ 3,500___5,000___16,384
Degrees___8____8_____8______18.5____21.5____22.5__ ___22______25_____25
In FN131 (WOT vs. RPM), notice that the A9P does add 10* of advance at lower WOT rpm's. If proper gearing is being selected by the driver, then a manual t5 Mustang should not see WOT below 1,600 rpm. For this reason using an A9P in a t5 Mustang will provide minimal performance gain due to ignition timing advance.
Most likely Ford used the extra 10* of advance in the A9P to help ‘off the line’ performance in the automatic Mustang. Using an A9L in an automatic equipped Mustang would sacrifice this added timing. This is why an A9L is not recommended for AOD equipped Mustangs.
Below are a couple more WOT Ignition Timing tables. The influence of these tables will be less significant than FN131, as the following tables are ‘Adders’ to Total Ignition Timing.
As ‘Adders’ the following values are added to the WOT table, to arrive at Total Ignition Timing. For example, in an A9L at WOT, ECT at 246F, and 5,000rpm the total timing will be (25* - 4*) 21*.
Also, it should be noted that the computer assumes the distributor is always set at the stock 10* ignition advance setting. For example, advancing the distributor from the factory 10* of advance to 14* will add an additional 4* to the total timing.
Using the same example from above, this will return the total timing to 25* (making up for the 4* of retard from FN134 at an ECT of 246F).
WOT Spark Advance vs. ECT – FN134
A9L
ECT_____-256____86____120___200___236___246___254
Degrees____3_____3______0_____0____-2_____-4____-4
A9P
ECT_____-256____86____120___200___236___246___254
Degrees____3_____3______0_____0____-2_____-4____-4
X3Z
ECT_____-256____86____120___210___236___244___254
Degrees____3_____3______2_____0____-2_____-4____-4
WOT Spark Advance vs. ACT – FN135
A9L
ACT_____-256____-256____-256___-256___150___240___254
Degrees____0______0_______0______0_____0_____-6____-6
A9P
ACT_____-256____-256____-256___-256___150___240___254
Degrees____0______0_______0______0_____0_____-6____-6
X3Z
ACT_____-256____-256____-256___-256___160___240___254
Degrees____0______0_______0______0_____0_____-6____-6
WOT Spark Advance vs. BP – FN133
A9L
BP_______0____23.5____26.5___27.75___31.875
Degrees__12_____4_______4______0______0
A9P
BP_______0____23.5____26.5___27.75___31.875
Degrees__12_____4_______4______0______0
X3Z
BP_______0____23.5____26.5___27.75___31.875
Degrees__12_____6_______5______0______0
Now some of the Part Throttle Ignition Timing Tables
Spark Table Base – FN901
The computer always assumes the base ignition timing to be set at 10* of advance.
Thus, this Table includes the factory 10* of the base timing set at the distributor. For example, an A9L with 14* set at the distributor will see 25* at 75% load and 4,000rpm (21* in the table, plus 4* over the initial of 10* = 25*). Likewise, an A9L with 10* set at the distributor will see 21* at the same load/rpm.
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