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DBW tuning/maps '11


bigstrusk
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Just getting into this scene but first interest is in tuning DBW. I've done my research and understand both 05-06ish scheme (2-table pedal angle to requested torque) and "newer" scheme (3-table with introduction of torque base table & ratio tables).

 

I'll be tuning from a stock EE5IB20W ROM for my MY11 USDM Legacy 2.5i MT since it is compatible and already defined (http://www.romraider.com/forum/viewtopic.php?f=34&t=8511). The def and ROM have Requested Torque and Target Throttle Plate Pos tables. However, the 100% pedal Requested Torque val is 252, yet max x-scale value on Throttle Plate Pos (the goesinto) is 220. I've read in several places that that's one of the cardinal sins of DBW tuning, not keeping the maxes in sync. It leads me to wonder if there's a transformation table out there (like Torque Base/Ratio) that's missing? Or if this really is an old scheme and Subaru just did a faux pas. I'm not sure what the impact or need of having the requested torque value being higher there is, and if I should tune that out. I don't see anywhere else in the ROM def that references requested torque.

 

Any insight would be appreciated, thanks!!

 

-Matt

 

 

For reference, I see evidence from SOA of the new scheme implementation being a bit scattered. Evidence of 10-12 2.5 Leg/OB having old, 11-12 3.6 Leg having new, 10-11 Imp having old, 11+ WRX has new...

DBW.thumb.png.10559094a05c4fe3f77a5081964f49e5.png

Edited by bigstrusk
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The requested torque being mapped like that would probably make more sense for an Auto as per this thread:

http://forum.liberty.asn.au/viewtopic.php?f=56&t=21405

 

Torque converter lockup is improved as it would reference RT.

 

On manual it doesn't make much sense to me.

 

Maybe subaru didn't bother changing that aspect between an Auto and Manual rom.

Edited by moral hazard
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Just scale them both up to 100. Makes it easy that way.

I'm hesitant to change the ranges that the tables output, since unsure where else the values may be used in the ECU.

 

The requested torque being mapped like that would probably make more sense for an Auto as per this thread:

http://forum.liberty.asn.au/viewtopic.php?f=56&t=21405

 

Torque converter lockup is improved as it would reference RT.

 

On manual it doesn't make much sense to me.

 

Maybe subaru didn't bother changing that aspect between an Auto and Manual rom.

That... Would not surprise me in the least. Thanks for that insight.

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