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In my past, I have done alot of tuning using Hondata, Crome, and other ECU Tunings for hondas... But Now I am into Subarus, and trying to learn how the ECU's work... I searched, and found one post, but I didn't really see the answer I was looking for...

I see there are A,B,C,D for Target Boost, Initial Wastegate Duty, Max Wastegate duty, Low Det Fuel, High Det Fuel, and base ignition timing... But they are all the same... Does only one need to be changed? Or do all? I see nothing anywhere about the rollover from table to table, or how they interact with each other... Is there any type of FlowChart or cross reference to show which tables cross what?

Thanks in advance for your help guys. I'm lovin this stuff.

I know the low det and high det maps are supposed to be a sort of "limp mode." low detonation detected fuel map and high detonation fuel map... The timing should be slightly lower on the high det map.

other than that, I've noticed that they're all the same too... and not sure which to edit either...

anyone??

I did some more searching, and I BELIEVE it is this.

A: Cold Start Table
B: Optimal Driving Conditions
C: Knock/Bad Gas Table
D: Failsafe Mode

Usually once warmed up, the car takes an average between A & B under optimal driving conditions. Yes/No? Can anybody elaborate a little bit more?

Anybody to confirm the above? Am also confused with the A,B,C,D maps.

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Read the following from my Enginuity ecu defs and logger def updates and you'll have a better idea of what is going on for most of these multiple tables:

"A portion of the multiple tables (A,B,C, etc.) in each 32bit ROM are transmission specific. Because each ROM is designed for either a manual or automatic transmission, those tables that do not apply can be removed. The following tables have been impacted by this update:

Target Boost A/B/C/D - reduced to two tables
Initial Wastegate Duty A/B/C/D - reduced to two tables
Wastegate Compensation A/B (Atmosphere) - reduced to one table
Wastegate Compensation A/B (Intake Temp) - reduced to one table
Wastegate Compensation A/B/C/D (Intake Temp) - reduced to two tables
Wastegate Compensation A/B (Coolant Temp) - reduced to one table
Max Wastegate Duty A/B - reduced to one table
Initial Wastegate Duty Alternate A/B/C - reduced to one table for MT, two for AT
Timing Advance A/C - A or C removed on select ROMs (not tranny based)
Speed Limiting 1/2 - reduced to one value each table (renamed Speed Limiting A/B)
Idle Speed A/B/C/D/E/F - reduced to three tables
Closed Loop RPM A/B (Per Gear) - reduced to one table
Closed Loop RPM A/B (Other) - reduced to one table
Closed Loop Atmospheric Pressure - Only applicable for AT ROMs. Removed from MT ROMs.
Closed Loop Throttle Sea Level - Only applicable for AT ROMs. Removed from MT ROMs.
Closed Loop Throttle High Altitude - Only applicable for AT ROMs. Removed from MT ROMs.
Closed Loop Throttle Maximum - Only applicable for MT ROMs. Removed from AT ROMs."

*********************************************************

"'Map Ratio A' - For some of the multiple tables, this ratio multiplier determines how much of the two tables will be used to determine a target. That is, each target from two tables (A and B), will be combined to come up with the final target. Typically, it is calculated as follows:

Final target = (Map A Target * (1.0 - Map Ratio A Multiplier)) + (Map B Target * Map Ratio A Multiplier)

If the map ratio is 0, Map B will be effectively disabled. If the map ratio is 1, Map A will be effectively disabled. However, the map ratio can be any value between 0 and 1, in which case portions of each map will determine the final target. The map ratio logic typically involves the following tables (0.784b ecu defs only):

Target Boost A/B
Initial Wastegate Duty A/B
Open Loop Fueling A/B
Base Timing A/B - except for 07 STi"