ignition timing trims
Jun 29, 2009, 06:30 AM
#77
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The function is for Idle Stability. Its purpose is to very quickly control your idle. So if you have big cams and the idle bops around, this can help to stabilise it. Normal idle control is slower to respond and works on a larger rpm error from what you really want. This works on a much smaller level and instantly adds or subtract torque at idle. Usually these functions are left for the more experienced tuner to setup.
Mr Fred, I had a play with 175c and it had no effect that I could see. I only spent around 10 minutes so maybe with some more time I can find its exact real-world function. I tried at 255, 32, and 0 with no obvious change. I might have a play with 1752 tomorrow again. It may be for either for A/C on or for In Gear. Considering all of the other Evo 7 and 8 roms I could find use the same addresses I would more expect it to not be related to the gear. I did all of my initial testing in Neutral with no A/C so that the timing was more stable in the map around 5 degrees. I might flatten the map and try again.
If anyone wants to add these addresses, add the following to your xml:
<table name="Idle Stability Timing Control" category="Timing" address="174e" type="2D" level="2" scaling="uint16">
<table name="Settings" type="Static X Axis" elements="3">
<data>Sensitivity</data>
<data>Timing Limit</data>
<data>Untested</data>
</table>
</table>
Mr Fred, I had a play with 175c and it had no effect that I could see. I only spent around 10 minutes so maybe with some more time I can find its exact real-world function. I tried at 255, 32, and 0 with no obvious change. I might have a play with 1752 tomorrow again. It may be for either for A/C on or for In Gear. Considering all of the other Evo 7 and 8 roms I could find use the same addresses I would more expect it to not be related to the gear. I did all of my initial testing in Neutral with no A/C so that the timing was more stable in the map around 5 degrees. I might flatten the map and try again.
If anyone wants to add these addresses, add the following to your xml:
<table name="Idle Stability Timing Control" category="Timing" address="174e" type="2D" level="2" scaling="uint16">
<table name="Settings" type="Static X Axis" elements="3">
<data>Sensitivity</data>
<data>Timing Limit</data>
<data>Untested</data>
</table>
</table>
Jun 30, 2009, 11:41 AM
#78
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Does anyone have the addresses for 96530006 for the tables below? Mine aren't coming out right, and I'm not sure if it's a scaling or addressing issue.
Base Timing Trim vs Load and RPM
Base Timing Trim vs Load and RPM Multiplier vs CTS
Min Load for IAT-Compensated Ignition Trim
IAT-Compensated Ignition Trim
Ignition Trim vs Baro (Unused)
This table seems fine:
Idle Stability Timing Control
Base Timing Trim vs Load and RPM
Base Timing Trim vs Load and RPM Multiplier vs CTS
Min Load for IAT-Compensated Ignition Trim
IAT-Compensated Ignition Trim
Ignition Trim vs Baro (Unused)
This table seems fine:
Idle Stability Timing Control
Apr 13, 2010, 08:32 PM
#82
Evolved Member
I have had two cars recently with 272 cams and mild cold idle issues.
Logging the idle, i found that the "Idle Stability Timing" parameters only come into play when the water temp reaches 53*C.
Making adjustments to the gain or limit values has no effect until 53*C.
Has anyone got any clues as to timing stability adjustment when cold ie < 53*C
Logging the idle, i found that the "Idle Stability Timing" parameters only come into play when the water temp reaches 53*C.
Making adjustments to the gain or limit values has no effect until 53*C.
Has anyone got any clues as to timing stability adjustment when cold ie < 53*C
Oct 5, 2010, 04:41 PM
#83
How does this timing and fuel compensation working ?
I see some table for timing in the v7. The Baro compensation set 0 so that is mean no timing compensation for baro ? When the intake air temp get high or too low than the Ecu will retard timing as the value in table ?
Fuel :
The AirflowHz Baro and Air temp compensation 3d table is responsible for it ?
How can I get that fraction number ? what is the unit of the temp and baro, how can i get that fraction numbers ? If I set 1 in everywhere than no compensation ?
This table affect for incosistant logg load ? Like example in colder wheather I can log more load ?
I see some table for timing in the v7. The Baro compensation set 0 so that is mean no timing compensation for baro ? When the intake air temp get high or too low than the Ecu will retard timing as the value in table ?
Fuel :
The AirflowHz Baro and Air temp compensation 3d table is responsible for it ?
How can I get that fraction number ? what is the unit of the temp and baro, how can i get that fraction numbers ? If I set 1 in everywhere than no compensation ?
This table affect for incosistant logg load ? Like example in colder wheather I can log more load ?
Nov 28, 2010, 07:46 PM
#84
Evolved Member
bump for mrfred, this is the 53*C temp thing I was refering to in another thread.
somewhere around post #37 either you or Matjinn mentioned a flag and i was thinking it may be temp related.
somewhere around post #37 either you or Matjinn mentioned a flag and i was thinking it may be temp related.
May 29, 2011, 01:20 PM
#86
Anymore information about these tables in the last few months? I'm trying to track down a slight stumble in the first 10-20 seconds of cold start driving in 50-80*F weather. I'm not sure if this egr advance is possibly interacting with my openloop lean cruise with high timing causing it to miss? I'm targeting a 15.2 cruise but in the first few minutes I'm now idling around 16.0-16.4 until it settles down and hits 14.7. I suspect one of these warmup tables.... 88590015 V7
May 29, 2011, 10:11 PM
#87
Haven't looked at the cold start stuff recently. I have however found what looks to be a cruise ignition trim set of tables. They are based on speed, RPM, IAT, Baro, and a few other things.
Majority of the sub is at 17A2A in 96530006 for those interested.
Also, MAY have found individual cylinder trims that are disabled from the factory. Not too sure about this one though.
Majority of the sub is at 17A2A in 96530006 for those interested.
Also, MAY have found individual cylinder trims that are disabled from the factory. Not too sure about this one though.
Dec 21, 2014, 10:13 AM
#88
Bringing this back from the dead, I have a question. I'm guessing by now everyone knows that these maps control the high timing during the cold starts. I was seeing on average 10* advance from 45* temps all the way out to 145* where it would start following my main ign map. By zeroing out the base timing trim it keeps true to my map even in cold starts. So great news there. But my question is will this have a long term affect on the motor? Mitsu used this for a reason and I'm guessing it was to warm up the cat.
So any long time users out there?
So any long time users out there?
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