A9L2 Base Calibration

by Michael Decipha Ponthieux
Posted: 2012-05-30
Last Updated: 2021-03-10

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

Note: Strategy swaps require Moates hardware.

Decipha's custom GUFX strategy is a derivative of the original ford GUFB strategy. This strategy and the following A9L2 calibration can be used to replace the following cal codes: A3M, A3M1, A3M2, A9L, A9M, D3D, S0Z, X3Z, the GUF1 cals- A9P, A9T, C3W, C3W1, and the GUFA cals- 8LD, A9S, A9S2. This strategy can also be used on 4 cylinder engine with the proper changes and can replace the GURE strategy for the 89-90 super coupes with cal codes- A0H0, A9U2, A9Z2, C0S, L0E1 using the base supercoupe cal L0E2 available upon request.

What is the A9L2 ?
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 or were not communicating between groups. 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 successfully 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, boosted (turbocharged, supercharged), nitrous and even bone stock factory engines all in one. Decipha's A9L2 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 first you must 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 as well as most other softwares auch as eec editor and binary editor. However due to the custom code and moved and relabeled functions and parameters scattered throughout the A9L2 it is not recommended to modify this cal with any other software besides TunerPro as you may be inadvertently changing a different parameter.

The following changes have already been done in the A9L2 calibration:
The following custom code is incorporated in the A9L2 calibration which separates GUFX from the original ford GUFB code. REQUIRED VALUES
The following are the absolute MINIMUM changes REQUIRED before starting your vehicle utilizing the A9L2 calibration. Be sure you input your variables IN THIS ORDER otherwise your values will be wrong! Before manually entering your injector data in your tune check to see if the template exists at the bottom of the tree view in tunerpro. If so simply click the patch to enable the injector data in your tune. NOTE that anytime you change the injector data in your tune you MUST update all values in your tune that have SP** most notably SARCHG and the MAF Transfer.

1>K-ConstantGlobal Fuel ModifierThis scalar should always be set to 30 and never adjusted.
2>SP**AHISLInjector High SlopeThis is your actual injector data from the manufacturer.
3>SP**ALOSLInjector Low SlopeInput your injector's manufacturer's data.
4>SP**FN389Injector BreakpointInput the injector manufacturer's recommended fuel breakpoint.
5>FN367Injector OffsetInput the manufacturer's recommended voltage offset values.
6>FN348Crank PW ECT ModifierMultiply the Y-axis as a percentage of the stock 302 cubic inch engine and stock 19 lb/hr injectors values by doing, 19/(new injector size) * (new engine size)/302=0.xxx Apply that 0.xxx correction to the entire y axis.
7>SARCHGCubic Inch DisplacementInput your actual engine size
8>FN035APerload 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. This can be left stock and updated as your tune is dialed in.
9>SP**FN036MAF TransferInput your actual MAF flow data from your flow sheet to begin tuning.
10>(Current) FN2200Spark TablePopulate this table with adequate values for your specific engine combination. Reference the spark write up and mbt chart for ideas.

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

As with all decipha base tunes its imperative you read over the pre-tuning write up, the fuel write up, spark write up and the initial tune instructions. Also know that the post tune Instructions apply as well to all tunes.

Special thanks goes out to Derek Fenwick, a.k.a. "sailorbob" / "dex" for originally creating DIY tuning support for the open source community.

Happy tuning.
Click here to download the A9L2, GUFX xdf and datalogging ADX.

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