Idle Ignition Timing

Easty · **Posted:** Mon May 27, 2013 7:00 am

td-d wrote:

Looks like you have the out of error range and electrical load tables swapped around (at least that's the way logic leads on the AZ1G101N).

Thanks I think your right it's a pretty busy routine, are the elec load tables in the rom your looking at zeroed out?

Easty · **Posted:** Mon May 27, 2013 7:10 am

RR base;

Code:

 <table type="3D" name="Ignition Timing Compensation Idle Target In Error Range A" category="Ignition Timing - Advance" storagetype="uint8" endian="big" sizex="9" sizey="9" userlevel="1">
      <scaling units="Ignition Timing" expression="(x*0.15625)-20" to_byte="(x+20)/0.15625" format="0.00" fineincrement=".01" coarseincrement=".1" />
      <table type="X Axis" name="Idle Speed Error" storagetype="float" endian="big">
        <scaling units="RPM" expression="x" to_byte="x" format="#" fineincrement="10" coarseincrement="100" />  
      </table>
      <table type="Y Axis" name="Engine Speed Delta" storagetype="float" endian="big">
        <scaling units="RPM" expression="x" to_byte="x" format="0.00" fineincrement="10" coarseincrement="100" />
      </table>      
      <description></description>
    </table>
    <table type="3D" name="Ignition Timing Compensation Idle Target In Error Range B" category="Ignition Timing - Advance" storagetype="uint8" endian="big" sizex="9" sizey="9" userlevel="1">
      <scaling units="Ignition Timing" expression="(x*0.15625)-20" to_byte="(x+20)/0.15625" format="0.00" fineincrement=".01" coarseincrement=".1" />
      <table type="X Axis" name="Idle Speed Error" storagetype="float" endian="big">
        <scaling units="RPM" expression="x" to_byte="x" format="#" fineincrement="10" coarseincrement="100" />
      </table>      
      <table type="Y Axis" name="Engine Speed Delta" storagetype="float" endian="big">
        <scaling units="RPM" expression="x" to_byte="x" format="0.00" fineincrement="10" coarseincrement="100" />
      </table>
      <description></description>
    </table>

    <table type="3D" name="Ignition Timing Compensation Idle Target Out of Error Range A" category="Ignition Timing - Advance" storagetype="uint8" endian="big" sizex="9" sizey="2" userlevel="1">
      <scaling units="Ignition Timing" expression="(x*0.15625)-20" to_byte="(x+20)/0.15625" format="0.00" fineincrement=".01" coarseincrement=".1" />
      <table type="X Axis" name="Idle Speed Error" storagetype="float" endian="big">
        <scaling units="RPM" expression="x" to_byte="x" format="#" fineincrement="10" coarseincrement="100" />  
      </table>
      <table type="Y Axis" name="Engine Speed" storagetype="float" endian="big">
        <scaling units="RPM" expression="x" to_byte="x" format="0.00" fineincrement="10" coarseincrement="100" />
      </table>      
      <description></description>
    </table>
    <table type="3D" name="Ignition Timing Compensation Idle Target Out of Error Range B" category="Ignition Timing - Advance" storagetype="uint8" endian="big" sizex="9" sizey="2" userlevel="1">
      <scaling units="Ignition Timing" expression="(x*0.15625)-20" to_byte="(x+20)/0.15625" format="0.00" fineincrement=".01" coarseincrement=".1" />
      <table type="X Axis" name="Idle Speed Error" storagetype="float" endian="big">
        <scaling units="RPM" expression="x" to_byte="x" format="#" fineincrement="10" coarseincrement="100" />
      </table>      
      <table type="Y Axis" name="Engine Speed" storagetype="float" endian="big">
        <scaling units="RPM" expression="x" to_byte="x" format="0.00" fineincrement="10" coarseincrement="100" />
      </table>
      <description></description>
    </table>
   
   <table type="3D" name="Ignition Timing Compensation Idle Target Load Change A" category="Ignition Timing - Advance" storagetype="uint8" endian="big" sizex="9" sizey="3" userlevel="1">
      <scaling units="Ignition Timing" expression="(x*0.15625)-20" to_byte="(x+20)/0.15625" format="0.00" fineincrement=".01" coarseincrement=".1" />
      <table type="X Axis" name="Idle Speed Error" storagetype="float" endian="big">
        <scaling units="RPM" expression="x" to_byte="x" format="#" fineincrement="10" coarseincrement="100" />  
      </table>
      <table type="Y Axis" name="Engine Speed" storagetype="float" endian="big">
        <scaling units="RPM" expression="x" to_byte="x" format="0.00" fineincrement="10" coarseincrement="100" />
      </table>      
      <description></description>
    </table>
    <table type="3D" name="Ignition Timing Compensation Idle Target Load Change B" category="Ignition Timing - Advance" storagetype="uint8" endian="big" sizex="9" sizey="3" userlevel="1">
      <scaling units="Ignition Timing" expression="(x*0.15625)-20" to_byte="(x+20)/0.15625" format="0.00" fineincrement=".01" coarseincrement=".1" />
      <table type="X Axis" name="Idle Speed Error" storagetype="float" endian="big">
        <scaling units="RPM" expression="x" to_byte="x" format="#" fineincrement="10" coarseincrement="100" />
      </table>      
      <table type="Y Axis" name="Engine Speed" storagetype="float" endian="big">
        <scaling units="RPM" expression="x" to_byte="x" format="0.00" fineincrement="10" coarseincrement="100" />
      </table>
      <description></description>
    </table>

td-d · **Posted:** Mon May 27, 2013 6:23 pm

Easty wrote:

td-d wrote:

Looks like you have the out of error range and electrical load tables swapped around (at least that's the way logic leads on the AZ1G101N).

Thanks I think your right it's a pretty busy routine, are the elec load tables in the rom your looking at zeroed out?

Yup, they are.

Heide264 · **Joined:** Sat May 07, 2011 3:22 pm **Posts:** 144

Easty wrote:

Heide264 wrote:

My idle is pretty crappy as well. I see the small variations you do, as well as some very large ones (it actually will cut to -4 degree advances time to time). I believe this is closely tied to the "Idle airflow" tables. I have been wanting to play around with them a bit, but the descriptions are a bit vague and I haven't had the time to really mess with them.

Which tables are you referring? to the decel tables found by td-d or the target tables found by me?

I was referring to the load based ones by td-d. I didn't notice your target/ignition related compensations... but I will have to look around for those.

Currently my laptop is being used as a DVR, so I haven't been able to play around much with the car tune, sadly.

rozsko · **Joined:** Tue Jul 25, 2017 9:29 pm **Posts:** 11

I tried to search for the axes values in my rom (A8DK100Z), but was not able to find anything similar.
Do you think this is not available in my rom? Don't know the 09/10 XT mentioned on the previous page, but due to the year I guess it is full can and maybe dual AVCS?
Thanks

td-d · **Posted:** Tue Oct 02, 2018 10:10 am

There are tables - they are, however, based on whether in gear or neutral - also have a different scaling:

Code:

ROM:0007F16C Table_Ignition_Timing_Compensation_Idle_Target_Neutral_A:.data.w 9
ROM:0007F16C                                         ; DATA XREF: sub_31128+BCo
ROM:0007F16C                                         ; ROM:off_312A4o
ROM:0007F16E                 .data.w 2
ROM:0007F170                 .data.l flt_CA738
ROM:0007F174                 .data.l flt_CA75C
ROM:0007F178                 .data.l byte_CA764      ; = -5.977
ROM:0007F17C                 .data.l h'4000000
ROM:0007F180                 .float 0.3515625
ROM:0007F184                 .float -45.0
ROM:0007F188 Table_Ignition_Timing_Compensation_Idle_Target_In_Gear_A:.data.w 9
ROM:0007F188                                         ; DATA XREF: sub_31128+C4o
ROM:0007F188                                         ; ROM:off_312A8o
ROM:0007F18A                 .data.w 2
ROM:0007F18C                 .data.l flt_CA778
ROM:0007F190                 .data.l flt_CA79C
ROM:0007F194                 .data.l byte_CA7A4      ; = -5.977
ROM:0007F198                 .data.l h'4000000
ROM:0007F19C                 .float 0.3515625
ROM:0007F1A0                 .float -45.0
ROM:0007F1A4 Table_Ignition_Timing_Compensation_Idle_Target_Neutral_B:.data.w 9
ROM:0007F1A4                                         ; DATA XREF: sub_31128+D6o
ROM:0007F1A4                                         ; ROM:off_312ACo
ROM:0007F1A6                 .data.w 2
ROM:0007F1A8                 .data.l flt_CA7B8
ROM:0007F1AC                 .data.l flt_CA7DC
ROM:0007F1B0                 .data.l byte_CA7E4      ; = -5.977
ROM:0007F1B4                 .data.l h'4000000
ROM:0007F1B8                 .float 0.3515625
ROM:0007F1BC                 .float -45.0
ROM:0007F1C0 Table_Ignition_Timing_Compensation_Idle_Target_In_Gear_B:.data.w 9
ROM:0007F1C0                                         ; DATA XREF: sub_31128:loc_31204o
ROM:0007F1C0                                         ; ROM:off_312B0o
ROM:0007F1C2                 .data.w 2
ROM:0007F1C4                 .data.l flt_CA7F8
ROM:0007F1C8                 .data.l flt_CA81C
ROM:0007F1CC                 .data.l byte_CA824      ; = -5.977
ROM:0007F1D0                 .data.l h'4000000
ROM:0007F1D4                 .float 0.3515625
ROM:0007F1D8                 .float -45.0

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Idle Ignition Timing

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