A9L2 Base Calibration

by Michael Decipha Ponthieux
Posted: 2012-05-30
Last updated: 2019-02-27

Supported Codes
The A9L2 base calibration can be used
in lieu of the following factory calibrations.

Strategy swaps require Moates hardware.

What is the A9L2 ?

The A9L calibration as well as all the stock foxbody calibrations are not optimal by any means. Henry's engineer's working on the foxbody calibrations obviously did not fully understand the functioning of the ECU's. This is evident by the 'band-aiding' they did to the fuel table and WOT multiplier to get fuel where they wanted it. The stock calibrations require extensive changes in order to sucessfully calibrate a vehicle even in completely bone stock form. The A9L2 base calibration, is a theoretical stock calibration for the foxbody ecu's created by decipha. This base calibration is adjusted for highly modified naturally aspirated and boosted engines including: turbocharged, supercharged, and nitrous, as well as bone stock factory engines. This base calibration can be used on ALL 1989-1993 foxbody mustang ECU's. However, for Tweecer users you cannot change strategies. If you have a tweecer and wish to use this calibration verify your ecu is a GUFB strategy ecu. TunerPro does not support reading or writing from the tweecer. Thus, it is recommended to use tunerpro to edit your tune and write it and datalog with caledit using the gufb strategy. Caledit can open tunerpro 56k binary tune files with no problems.


The following are the absolute MINIMUM changes REQUIRED before starting your vehicle utilizing the A9L2 calibration.
SARCHGCubic Inch DisplacementInput your actual engine size or scaled percentage if applicable (CLICK HERE FOR SCALING)
FN 036MAF TransferInput your actual MAF flow data from your flow sheet or your scaled percentage if applicable, be sure the top value is 16 volts
ALOSL, AHISLInjector SlopesInput your injector's manufacturer's recommended values if available or scaled percentage, see Note** below for no data
FN 389Injector BreakpointInput the injector manufacturer's recommended fuel breakpoint
FN 367Injector OffsetInput the manufacturer's recommended voltage offset values
(Current) FN904ASealevel Spark TableSee note below. Populate this table with adequate values for your specific engine combination.
FN 035Load ScalingPopulate the Y-axis with your engines expected peak N/A load values (when not in boost), DO NOT PUT IN MAXIMUM LOAD VALUES WHILE IN BOOST
FN 348Crank PWMultiply the Y-axis as a percentage of the stock 302 cubic inch and 19 lb/hr injectors values by doing, 19/(new injector size) * (new engine size)/302=0.xxx
Overheat protection shuts off the engine when your engine temp exceeds 240 degrees and allows 12 seconds of run time after restart so you can move the vehicle if need be, thats done with FN1306 and FN1307, do not change the last column values or the scaling for either of those tables

If you do not have injector data for your injector's, read the FUEL write up for more details.

For engines with aftermarket heads, its typical to reach loads of up to 0.8 and often greater.
Adjust the ENTIRE TABLE (ALL CELLS) by the difference of the N/A MBT spark value from the MBT Reference chart
subtracted by the current value in the tune at 0.8 load and 5000 rpm.
MBT reference can be found HERE

For example: If you have AFR heads [36 degrees] add 7 degrees to the entire table (36 - 29 = 7)
if you have old school GT40s (not Ps) [MBT=34 degrees] add 5 degrees to the whole table (34 - 29 = 5).
These adjustment are a general ballpark adjustment, you are still REQUIRED to adjust individual cells while tuning

For more details on FN035 Load Scaling check out the Scaling Write Up.

Features of the A9L2 Base Calibration

Other Variables

Although many other values exist in the ECU which can be adjusted to resolve other issues, they are not what I consider to be ABSOLUTELY REQUIRED. In short, the variables listed above are the most important variables in your calibration. For dry shot nitrous engines, the nitrous code is exclusive to premium members, contact me for more details.


Obviously you still tune as you would otherwise, the A9L2 is just to get you on your way much easier and faster, one is still required to dial in Fuel, Air, and Spark just as you would otherwise.

As with all EFIDynoTuning tunes, be sure to read over the Pre-Tuning Information. The Initial Tune Instructions and Post Tune Instructions apply as well.

If your tuning with TunerPro, be sure to download my latest GUFX ADX Definition on the homepage
It is not recommended to use the A9L2 tune with any other software due to the moved scaling and background code changes.
Special thanks goes out to Derek Fenwick, a.k.a. "sailorbob", a.k.a. "dex" for originally creating DIY tuning support for the open source community.

Downloads >> TunerPro Files >> A9L2

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