Can someone explain (timing related Q)
Feb 27, 2011, 02:53 AM
#1
Can someone explain (timing related Q)
Can someone explain why the car should have MORE timing when the Coolant Temp is cold?
The percentage modifier gets applied to the timing table - so once the car is warm we have 0% of whatever is in the table...
Forget that they are called EGR - I think thats plain wrong...
This might explain my car knocking when cold, especially if its adding 9* of timing at 2000rpm
Cheers
D.
Feb 27, 2011, 04:47 AM
#2
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Can someone explain why the car should have MORE timing when the Coolant Temp is cold?
The percentage modifier gets applied to the timing table - so once the car is warm we have 0% of whatever is in the table...
Forget that they are called EGR - I think thats plain wrong...
This might explain my car knocking when cold, especially if its adding 9* of timing at 2000rpm
Cheers
D.
I think if you run test pipe, you can set the increase to 0. You can do it with catalysator as well, but environment wil suffer ;-)
Last edited by xhomm02; Feb 27, 2011 at 04:50 AM.
Feb 27, 2011, 08:11 AM
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According to what I have read, the engine tries to get as high EGT after starting as possible (via increased timing) to get catalysator quickly to its operation temperature to have best catalytic efficiency.
I think if you run test pipe, you can set the increase to 0. You can do it with catalysator as well, but environment wil suffer ;-)
I think if you run test pipe, you can set the increase to 0. You can do it with catalysator as well, but environment wil suffer ;-)
Feb 27, 2011, 08:26 AM
#4
According to what I have read, the engine tries to get as high EGT after starting as possible (via increased timing) to get catalysator quickly to its operation temperature to have best catalytic efficiency.
I think if you run test pipe, you can set the increase to 0. You can do it with catalysator as well, but environment wil suffer ;-)
I think if you run test pipe, you can set the increase to 0. You can do it with catalysator as well, but environment wil suffer ;-)
Feb 27, 2011, 01:59 PM
#5
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According to what I have read, the engine tries to get as high EGT after starting as possible (via increased timing) to get catalysator quickly to its operation temperature to have best catalytic efficiency.
I think if you run test pipe, you can set the increase to 0. You can do it with catalysator as well, but environment wil suffer ;-)
I think if you run test pipe, you can set the increase to 0. You can do it with catalysator as well, but environment wil suffer ;-)
I just asked the same question and I got very much the same answer.
Feb 27, 2011, 03:48 PM
#6
I think its timing retard puts more heat in the exhaust. There are cat efficiency tables that retard the timing when the engine is cold. This same cold engine ign advance table is in the CT9A ROMs. Perhaps cold engines need more advance to create a more complete burn. At any rate, I find it comical that both advance and retard tables exist.
I will have to look up the coldstart tables and see what their conditions are..
Feb 27, 2011, 03:50 PM
#7
Tephra can you get that table(s) for my rom?
55590107 (Your 2010 RA Tephra ROM)
EDIT: I have the main one:
<table name="EGR Timing Advance" address="57359" category="Timing" type="3D" swapxy="true" scaling="Timing">
<table name="Load" address="61778" type="X Axis" elements="9" scaling="Load"/>
<table name="RPM" address="6175e" type="Y Axis" elements="10" scaling="RPM"/>
</table>
Last edited by razorlab; Feb 27, 2011 at 03:56 PM.
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Feb 27, 2011, 04:02 PM
#8
Another question:
I've been curious about the table labeled "Ignition Warmup Retard" in the Evo 10/RA roms.
With it set to "timing" scaling they read positive timing, with it set to "Min Timing" they read negative timing. The Defs currently out have them as "timing"
Tephra, do you know which is correct?
I've been curious about the table labeled "Ignition Warmup Retard" in the Evo 10/RA roms.
With it set to "timing" scaling they read positive timing, with it set to "Min Timing" they read negative timing. The Defs currently out have them as "timing"
Tephra, do you know which is correct?
Feb 27, 2011, 05:01 PM
#12
Another question:
I've been curious about the table labeled "Ignition Warmup Retard" in the Evo 10/RA roms.
With it set to "timing" scaling they read positive timing, with it set to "Min Timing" they read negative timing. The Defs currently out have them as "timing"
Tephra, do you know which is correct?
I've been curious about the table labeled "Ignition Warmup Retard" in the Evo 10/RA roms.
With it set to "timing" scaling they read positive timing, with it set to "Min Timing" they read negative timing. The Defs currently out have them as "timing"
Tephra, do you know which is correct?
Feb 27, 2011, 05:43 PM
#14
Another question:
I've been curious about the table labeled "Ignition Warmup Retard" in the Evo 10/RA roms.
With it set to "timing" scaling they read positive timing, with it set to "Min Timing" they read negative timing. The Defs currently out have them as "timing"
Tephra, do you know which is correct?
I've been curious about the table labeled "Ignition Warmup Retard" in the Evo 10/RA roms.
With it set to "timing" scaling they read positive timing, with it set to "Min Timing" they read negative timing. The Defs currently out have them as "timing"
Tephra, do you know which is correct?
The scaling is Timing, but what happens is that under certain conditions the ECU interpolates between this map and the regular timing maps.
After about 50C it doesn't use this map at all...
Feb 27, 2011, 06:22 PM
#15
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Isn't this the map that controls that?
(for the 2010 maps)
<table name="Percent Low Temp Timing Trim vs Coolant Temp" address="561bc" category="Timing" type="2D" scaling="Percent255">
<table name="Engine Temp" address="61310" type="Y Axis" elements="8" scaling="TempFarenheit"/>
</table>
(for the 2010 maps)
<table name="Percent Low Temp Timing Trim vs Coolant Temp" address="561bc" category="Timing" type="2D" scaling="Percent255">
<table name="Engine Temp" address="61310" type="Y Axis" elements="8" scaling="TempFarenheit"/>
</table>