Thread: Ask a tuner...
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Old 05-16-2011, 01:08 PM   #414
TurboSetch
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Join Date: Oct 2008
Chapter/Region: AKIC
Location: Palmer,AK
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The information here is a little light. I would not attempt it myself without seriously looking at the code to see what exactly has changed.

From a logical view it would not make sense for Subaru to make hardware changes midway thru production but its possible. I think the theory on just some quick changes to the tune is probably correct.

On a side note I think if you did force a flash back to the earlier rom that it would most likely work and if it didn't you probably would not have any issues flashing it back to the original. As others had mentioned you need to do a proper reset of the ECU to clear the RAM. These newer ECUs do not reset after a flash any more like the older ones did.

Sorry I have no better information right now. There is a ticket open for defs to be made on your rom. Give it a few months and they will appear I am sure.

Quote:
Originally Posted by maxplanck View Post
USDM 2011 WRXs have (at least) two different roms from the factory, CALID AE5I910L on cars with build dates in 2010, CALID AE5IA10L on cars built in 2011 (exact changeover date uncertain). The first rom has experimental definitions posted at Romraider, opens in both Ecuflash and RomRaider. The second has not yet been defined. There is a Subaru TSB that says the reason for the change is emissions related and seems to imply that there are no hardware changes between the two.

I have one of each. The more recent revision does not drive well -- it has nasty OL delays that really must be addressed. Both need DBW changes. I hate the "launch or bog" initial throttle sensitivity.

It has been suggested that I flash AE5I910L over AE5IA10L, then tune as desired. I have a "stub" (no tables) ecuflash def only for the newer rom that *should* allow me to reflash the new rom in the event the earlier one does not work for some reason.

Anyhow, this all looks reasonable to me, but I hate to be the guinea pig. Looking for a sanity check, please.

Relevant romraider thread here http://www.romraider.com/forum/viewtopic.php?f=8&t=7146
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