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Tuning Evo789 ACD

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Old Sep 25, 2013, 02:57 AM
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Tuning Evo789 ACD

It would seem that there is growing interest (at least in the US) in ACD tuning/flashing, so I will make a contribution.

Edit 07-01-2014: Revised xml with map label corrections and improved scaling.

Edit 08-01-2014: Revised xml with Snow and Gravel maps swapped, Pump Limits added and enhanced Tuning Notes.

Edit 25-01-2014: Revised xml, lots of revisions and additions.

Edit 09-02-2014: Revisions to 401702 xml, showing current work/thinking on AYC Control. Not complete by a long way and the scalings are speculative. The other posted xmls have not been updated yet.

Last edited by merlin.oz; Feb 8, 2014 at 04:00 PM.
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Old Sep 25, 2013, 03:03 AM
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Some general notes on ACD Module Flashing:

You will need a Tactrix OpenPort2 flashing cable.

You will need to make a bench flashing cable.

There is a checksum required, which is included in the xml shown.

Evo8 and Evo9 can use the same ROMs ie are interchangeable with the testing I have done so far.

Evo7 ACD Modules run a different line pressure so a DTC is raised if you flash an Evo7 ROM into your Evo8-9.



EVO-789 ACD MODULE BENCH FLASHING HARNESS

ACD pin 13, +12V

ACD pin 25, Flash

ACD pin 31, +12V

ACD pin 35, OBD pin 7

ACD pin 42, ground

OBD pin 4, ground

OBD pin 5, ground

OBD pin 16, +12V

Last edited by merlin.oz; Sep 25, 2013 at 03:54 AM.
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Old Sep 25, 2013, 03:06 AM
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How do you pull or flash the ROM to the ACD?
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Old Sep 25, 2013, 03:42 AM
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That is partially covered in the break through reading flashing acd thread.

Merlin thanks !!!

I have the acd rom from evoscan and a c1 rom. They're for a 9 and 8 respectively but I checked addresses and they were the same for what I checked.

Good to confirm they are interchangeable!
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Old Sep 25, 2013, 06:00 AM
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Nice merlin, this is a great step for us
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Old Sep 25, 2013, 06:02 AM
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Originally Posted by 211ratsbud View Post
That is partially covered in the break through reading flashing acd thread.
Just for easier referencing, can you point us to the thread?

And is there a tutorial with pretty pictures for us more technically challenged folks that can't quite picture what to build from Merlin's pinout?
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Old Sep 25, 2013, 06:09 AM
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Originally Posted by worksie View Post
Just for easier referencing, can you point us to the thread?

And is there a tutorial with pretty pictures for us more technically challenged folks that can't quite picture what to build from Merlin's pinout?

OBD2 pinout


Might look in the first post, there is a schema that shows basically how to do your bench harness.
For ACD pinout here it is:


Last edited by domyz; Sep 25, 2013 at 06:19 AM.
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Old Sep 25, 2013, 06:22 AM
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while I'm happy with the performance increase in full throttle applications (80%-100%) with my Weir 12 plate rear at the track, the diff(s) still don't lock as hard as I'd like during partial/maintenance throttle (~40%-70%). I'm currently looking into ACD tuning for next year and very interested in where this is going.

thanks for sharing
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Old Sep 25, 2013, 06:41 AM
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Subscribed. Hoping to look into this over the offseason
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Old Nov 14, 2013, 01:24 PM
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Thanks for sharing Merlin.

Just a side not to yours, in my testing, I've found that the Evo 8 and 9 ACD ecu's are not directly interchangeable. Putting an Evo 8MR/9 ACD ECU into my JDM Evo 8 GSR has resulted in the 3 lights once moving.

I believe there is a way to resolve with with a wiring mod, but i have not tested it as yet.

Specifically i'm referring to ID 401403 (JDM Evo 8) and swapping to a 401404 or 403100 rom ID.
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Old Dec 8, 2013, 05:03 AM
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I believe you can use 1.3u cable as well Merlin. I have seen posts where people have used the 1.3u cable.
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Old Dec 8, 2013, 01:59 PM
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I never beat on mine since I got it this summer! tbh sorta scared to slide out or lose control
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Old Jan 2, 2014, 02:55 AM
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This set is for the USA Evo9 ACD Control Module, 401702 ROM, Case ID 8631A028.

All the ACD Control Modules I have seen have the FA chip, which the 1.3U cable wont flash. But Its a big world, who knows what else is out there.

Edit 7/1/2014: Revised xml with map corrections and some included tuning notes.

Edit 8/1 2014: Revised xml with Snow and Gravel maps swapped, Pump Limits added and enhanced Tuning Notes.
Attached Files
File Type: hex
401702 ACD Evo9 stock.hex (128.0 KB, 0 views)

Last edited by merlin.oz; Jan 7, 2014 at 09:55 PM.
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Old Jan 2, 2014, 03:25 AM
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This is a mildly tuned version of the 401702 ROM.
Attached Files
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Old Jan 2, 2014, 10:08 AM
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Thanks, that difference is tuned to the original?
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