"FMIC Rich Dip" partially caused by the ECU

Nuke209 · **Joined:** Sun Oct 15, 2006 9:10 pm **Posts:** 191

NSFW wrote:

Nuke209 wrote:

A2JZB11J soon :?:

What year/make/model is that ROM?

2005 STI USDM, I see that you have it for A2JZB10J, B11J is the latest revision for that same ecu

NSFW · **Joined:** Wed Nov 22, 2006 10:23 pm **Posts:** 2273

There's a very good chance that the definitions I posted for WolfPlayer's car will work with that ROM. Try it... It will probably be pretty obvious if the definition isn't compatible - the tables will be filled with random numbers. If you post a screenshot of the tables I'll give them a sanity check.

Nuke209 · **Joined:** Sun Oct 15, 2006 9:10 pm **Posts:** 191

Gave it a shot on the B11J and tables looks just like the B10J :mrgreen:

NSFW · **Joined:** Wed Nov 22, 2006 10:23 pm **Posts:** 2273

You're in business, then.

Merp · **Posted:** Sat Nov 05, 2011 6:58 am

Just went through all the transient fueling logic on A8DH201X, found very similar control scheme and tables... Going to define them today and do some testing

NSFW · **Joined:** Wed Nov 22, 2006 10:23 pm **Posts:** 2273

Great! I am pretty sure that Freon's "dyn_def" table (I think that was the term he used) was trying to do the same thing, and the two were probably fighting each other at times.

What I'd really like to do is make a 3D table with MAF on the X axis, and delta-MAF on the Y axis. The code that computes delta-load could probably be hijacked to compute delta-MAF for us instead.

Gotta run, time for lunch.

Merp · **Posted:** Sat Nov 05, 2011 6:27 pm

Ya, I tried the dyn_def stuff, but the delta-MAP values were really choppy. I think this is a much better solution, and shouldn't be very hard to tweak the logic if the tables can't fix it.

Merp · **Posted:** Sun Nov 06, 2011 1:47 pm

Just made some tweaks, zeroed the high load row (increased the row header as well) of the 3d table (Tau A Rising [ect x load]), and reduced the high load (1.4g/rev+) region of Tau B Rising - load. So far good results

SPECIAL THANKS TO SUBARU DIESEL CREW
Scoobyrom is AWESOME! XMLwrite made things easier, but scoobyrom is in a league of its own. Thanks!

A8DH200X - A8DH202X

Code:

   <table type="2D" name="Tau B Rising - RPM" category="" storagetype="uint8" endian="big" sizey="10" storageaddress="0xC8AF0">
      <!-- min: 0.9765625  max: 1.953125  average: 1.757813 -->
      <scaling units="RPM" expression="x*0.1953125" to_byte="x/0.1953125" format="0.000" fineincrement="0.01" coarseincrement="0.1" />
      <table type="Y Axis" name="Engine Speed" storagetype="float" storageaddress="0xC8AC8">
        <!-- 3600 to 7200 -->
        <scaling units="RPM" expression="x" to_byte="x" format="0.00" fineincrement="1" coarseincrement="5" />
      </table>
      <description>
      </description>
    </table>
    <table type="2D" name="Tau B Falling - RPM" category="" storagetype="uint8" endian="big" sizey="10" storageaddress="0xC8B24">
      <!-- min: 0.9765625  max: 9.960938  average: 7.070313 -->
      <scaling units="RPM" expression="x*0.1953125" to_byte="x/0.1953125" format="0.000" fineincrement="0.01" coarseincrement="0.1" />
      <table type="Y Axis" name="Engine Speed" storagetype="float" storageaddress="0xC8AFC">
        <!-- 3600 to 7200 -->
        <scaling units="RPM" expression="x" to_byte="x" format="0.00" fineincrement="1" coarseincrement="5" />
      </table>
      <description>
      </description>
    </table>
    <table type="2D" name="Tau A Rising - ECT" category="" storagetype="uint16" endian="big" sizey="16" storageaddress="0xC9122">
      <!-- min: 1  max: 6.905762  average: 3.807892 -->
      <scaling units="degC" expression="x*0.0004882813" to_byte="x/0.0004882813" format="0.000" fineincrement="0.01" coarseincrement="0.1" />
      <table type="Y Axis" name="Coolant Temp" storagetype="float" storageaddress="0xC8974">
        <!-- -40 to 110 -->
        <scaling units="degC" expression="x" to_byte="x" format="0.00" fineincrement="1" coarseincrement="5" />
      </table>
      <description>
      </description>
    </table>
    <table type="2D" name="Tau A Falling 2 -ECT" category="" storagetype="uint16" endian="big" sizey="16" storageaddress="0xC9142">
      <!-- min: 1  max: 1.899902  average: 1.432495 -->
      <scaling units="degC" expression="x*0.0004882813" to_byte="x/0.0004882813" format="0.000" fineincrement="0.01" coarseincrement="0.1" />
      <table type="Y Axis" name="Coolant Temp" storagetype="float" storageaddress="0xC8974">
        <!-- -40 to 110 -->
        <scaling units="degC" expression="x" to_byte="x" format="0.00" fineincrement="1" coarseincrement="5" />
      </table>
      <description>
      </description>
    </table>
    <table type="2D" name="Tau A Falling 1 - ECT" category="" storagetype="uint16" endian="big" sizey="16" storageaddress="0xC9162">
      <!-- min: 1  max: 14  average: 9.337524 -->
      <scaling units="degC" expression="x*0.0004882813" to_byte="x/0.0004882813" format="0.000" fineincrement="0.01" coarseincrement="0.1" />
      <table type="Y Axis" name="Coolant Temp" storagetype="float" storageaddress="0xC8974">
        <!-- -40 to 110 -->
        <scaling units="degC" expression="x" to_byte="x" format="0.00" fineincrement="1" coarseincrement="5" />
      </table>
      <description>
      </description>
    </table>
    <table type="2D" name="Tau B Sigmoid" category="" storagetype="uint16" endian="big" sizey="13" storageaddress="0xC91B8">
      <!-- min: -1  max: 1  average: -0.1097506 -->
      <scaling units="d(g/s)/dt" expression="x*0.0004882813-16" to_byte="(x+16)/0.0004882813" format="0.000" fineincrement="0.01" coarseincrement="0.1" />
      <table type="Y Axis" name="delta Load" storagetype="float" storageaddress="0xC9184">
        <!-- -0.3 to 0.3184 -->
        <scaling units="d(g/s)/dt" expression="x" to_byte="x" format="0.00" fineincrement="1" coarseincrement="5" />
      </table>
      <description>
      </description>
    </table>
    <table type="2D" name="Tau B Rising - Load" category="" storagetype="uint16" endian="big" sizey="11" storageaddress="0xC9200">
      <!-- min: 0.125  max: 1.700195  average: 0.6045809 -->
      <scaling units="g/rev" expression="x*0.0004882813" to_byte="x/0.0004882813" format="0.000" fineincrement="0.01" coarseincrement="0.1" />
      <table type="Y Axis" name="Engine Load" storagetype="float" storageaddress="0xC91D4">
        <!-- 0 to 3 -->
        <scaling units="g/rev" expression="x" to_byte="x" format="0.00" fineincrement="1" coarseincrement="5" />
      </table>
      <description>
      </description>
    </table>
    <table type="2D" name="Tau B Falling - Load" category="" storagetype="uint16" endian="big" sizey="11" storageaddress="0xC9244">
      <!-- min: 0.5  max: 2  average: 0.7954546 -->
      <scaling units="g/rev" expression="x*0.0004882813" to_byte="x/0.0004882813" format="0.000" fineincrement="0.01" coarseincrement="0.1" />
      <table type="Y Axis" name="Engine Load" storagetype="float" storageaddress="0xC9218">
        <!-- 0 to 3 -->
        <scaling units="g/rev" expression="x" to_byte="x" format="0.00" fineincrement="1" coarseincrement="5" />
      </table>
      <description>
      </description>
    </table>
    <table type="3D" name="Tau A Rising - ECT x Load" category="" storagetype="uint16" endian="big" sizex="16" sizey="3" storageaddress="0xCAAE4">
      <!-- min: 1  max: 12.10938  average: 4.185404 -->
      <scaling units="" expression="x*0.0004882813" to_byte="x/0.0004882813" format="0.000" fineincrement="0.01" coarseincrement="0.1" />
      <table type="X Axis" name="ECT" storagetype="float" storageaddress="0xC8974">
        <!-- -40 to 110 -->
        <scaling units="DegC" expression="x" to_byte="x" format="0.00" fineincrement="1" coarseincrement="5" />
      </table>
      <table type="Y Axis" name="Load" storagetype="float" storageaddress="0xCAAD8">
        <!-- 0.7 to 1.2 -->
        <scaling units="g/s" expression="x" to_byte="x" format="0.00" fineincrement="1" coarseincrement="5" />
      </table>
      <description>Transient fueling (Tau) input A compensation applied during rising load values</description>
    </table>

td-d · **Posted:** Fri Nov 11, 2011 11:42 am

What's interesting in the '08 code (well, assuming I've found the right locations

) is that all of these tables are doubled - which makes me think cruise / non-cruise. E.g. for the AZ1G202G :

Code:

loc_2BBFC:                              ; CODE XREF: Fun_Transient_Fueling_TauB_?+28j
ROM:0002BBFC                 extu.b  r14, r0
ROM:0002BBFE                 cmp/eq  #1, r0
ROM:0002BC00                 mov.l   off_2BD48, r4 ; Sigmoid?Map2_C9478
ROM:0002BC02                 bf      loc_2BC06
ROM:0002BC04                 mov.l   off_2BD4C, r4 ; Sigmoid?Map2_C9428

NSFW · **Joined:** Wed Nov 22, 2006 10:23 pm **Posts:** 2273

The 05 LGT ROMs don't have the same cruise/non-cruise logic as the STI ROMs. There are some tables in my ROM that exist in pairs (target boost comes to mind), but even for those, the switch ratio is hard-coded to 1.0 so only one table ever gets used.

It's like they started thinking about cruise/non-cruise while they were working on LGT ECUs, but didn't really use it until they did the STIs.

dschultz · **Posted:** Sat Nov 12, 2011 11:26 am

Or, the tables are for use with another transmission type and they just left them and hardcoded the table select variable for the type of tranny the ECU would be used with.

dschultz · **Posted:** Sat Nov 12, 2011 11:44 am

td-d wrote:

Code:

ROM:0002BC00                 mov.l   off_2BD48, r4 ; Sigmoid?Map2_C9478

It's been like 30 years since I had to do math functions. I had to look that up to figure out what a sigmoid is :oops:

dschultz · **Posted:** Sat Nov 12, 2011 11:55 am

How much of an affect would running TGV deletes have on the Tau?
Do you think it would be enough to cause engine surge at low load (<1) engine acceleration through the 2000 - 2500 RPM range?

NSFW · **Joined:** Wed Nov 22, 2006 10:23 pm **Posts:** 2273

dschultz wrote:

How much of an affect would running TGV deletes have on the Tau?
Do you think it would be enough to cause engine surge at low load (<1) engine acceleration through the 2000 - 2500 RPM range?

I could see it having some effect.... my understanding is that they're primarily intended to improve atomization of the fuel on its way into the chamber, so the tau model probably should change depending on whether the TGVs are open. I wonder if that's one of the flags that gets checked in the code that calculates the delta-load enrichment, I haven't investigated any of them but that seems like a good candidate.

However, my TGVs would open up as soon as I touched the throttle, so they were never in effect by the time I reached the end of my driveway. I've heard they were more active in more recent years, but I don't know any details.

I get a bit of stumbling in that RPM range, mostly just when the motor is cold, but occasionally even when warm. I don't think AFR is a factor though, because my wideband stays pretty stable even when the stumble happens. But now you've got me wondering... if the TGVs stayed closed, maybe better atomization would be helpful.

dschultz · **Posted:** Tue Nov 15, 2011 12:16 am

NSFW wrote:

However, my TGVs would open up as soon as I touched the throttle, so they were never in effect by the time I reached the end of my driveway. I've heard they were more active in more recent years, but I don't know any details.

Being deleted there's possibly less air turbulence which to me would suggest a larger puddle and a rich condition compared to just TGV's that are open all the time.

So as not to clutter up this thread and take it off topic, I posted my problem over here.

RomRaider

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