Timing idle autopilot?
Jan 29, 2009, 03:22 PM
#1
Timing idle autopilot?
Not sure if this has been covered yet. But on a fully warmed engine idle timing does not respond to the timing map values.
For example, a 60 sec idle timing log has:
10° average
15° max
7° min
The rate of change is about 0.25 sec, kinda similar but not same speed of NBO2.
Back to the main point, this does not change at all to cell values UNLESS there is at least a very small throttle application. When I faintly rest my foot on the pedal, not enough to change MAF hz (keeping 31hz), but just enough to change TPS volts from 0.71 to 0.75, spark then will properly go to the map value, in my case 4° - and it stay's there or whatever according to rpm/load.
My reason is for idle control, I run idle servo delete and would like to open the BISS slightly to maintain cold engine idle (default to 14 - 15°, cold) and when warmed up I can lower rpm back down with timing. Currently warm idle is fine but cold, the car won't maintain itself without throttle for at least 45 seconds.
For example, a 60 sec idle timing log has:
10° average
15° max
7° min
The rate of change is about 0.25 sec, kinda similar but not same speed of NBO2.
Back to the main point, this does not change at all to cell values UNLESS there is at least a very small throttle application. When I faintly rest my foot on the pedal, not enough to change MAF hz (keeping 31hz), but just enough to change TPS volts from 0.71 to 0.75, spark then will properly go to the map value, in my case 4° - and it stay's there or whatever according to rpm/load.
My reason is for idle control, I run idle servo delete and would like to open the BISS slightly to maintain cold engine idle (default to 14 - 15°, cold) and when warmed up I can lower rpm back down with timing. Currently warm idle is fine but cold, the car won't maintain itself without throttle for at least 45 seconds.
Jan 29, 2009, 07:33 PM
#2
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That is the Idle Stability Timing Control, which is discussed in another thread (Ignition Timing Trims). The control of it has been found and it can be disabled if you so wish. As far as I understand it, it trims the timing based on the rate of change of rpm along with how far you are from the idle target.
Which rom is it? There will be a setting for the maximum amount of timing trim. My rom defaults at 8 degrees, but I have seen other roms with different values. Setting this to zero will effectively disable control.
Which rom is it? There will be a setting for the maximum amount of timing trim. My rom defaults at 8 degrees, but I have seen other roms with different values. Setting this to zero will effectively disable control.
Jan 30, 2009, 01:25 AM
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See if this works? I dont have your rom to check.
<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>
Should be 128, 8 , 8 if it is like most other roms.
<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>
Should be 128, 8 , 8 if it is like most other roms.
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