Speed Density Air Temp Correction
Sep 10, 2009, 09:20 AM
#1
Speed Density Air Temp Correction
Ok so I basically flattened the air temp correction table to try and cure a rich condition when its colder outside (around 60F). For whatever reason I can't make the car run at the correct 14.7 AFR with this table like it does when its hot outside over 90F.
I'm wondering if this is an artifact of using the fuel temp sensor as my air temp input. Any insight would be nice.
I'm wondering if this is an artifact of using the fuel temp sensor as my air temp input. Any insight would be nice.
Sep 10, 2009, 05:24 PM
#3
Ok so I basically flattened the air temp correction table to try and cure a rich condition when its colder outside (around 60F). For whatever reason I can't make the car run at the correct 14.7 AFR with this table like it does when its hot outside over 90F.
I'm wondering if this is an artifact of using the fuel temp sensor as my air temp input. Any insight would be nice.
I'm wondering if this is an artifact of using the fuel temp sensor as my air temp input. Any insight would be nice.
Sep 10, 2009, 05:53 PM
#4
no there was something in my fuel category labled "air temp correction". It likely doesn't correlate at all so i'm giving up on it.
The MAT table shouldn't be wrong the logged values are producing what i'd consider expected results. Those results just don't seem to be applied to the fueling equation where ever that may be.
Notable items:
EGR system is disabled
Cold temp ignition tables are enabled
Set to full time open loop (for tuning of course)
The MAT table shouldn't be wrong the logged values are producing what i'd consider expected results. Those results just don't seem to be applied to the fueling equation where ever that may be.
Notable items:
EGR system is disabled
Cold temp ignition tables are enabled
Set to full time open loop (for tuning of course)
Last edited by RoadSpike; Sep 10, 2009 at 05:56 PM.
Sep 10, 2009, 07:19 PM
#5
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I thought someone mentioned that the stock air temp tables compensated for air temp? I assume this is the "relative air density vs temp for airflow/hz" table. It is strangely odd however, going cold would provide more dense air to the motor and it *should* lean out. That it however unless the stock air temp compensation table is a little conservative and/or it is just a bit too much compensation for the SD.
Sep 10, 2009, 07:25 PM
#7
Is your WOT affected by half a point, too, or just idle? If just idle, I would chalk it up to normal variance and start running in closed loop and let the trims do their job.
From what I know of the SD code, the temp compensations are the same as if you were running a MAF, except that the temp is measure where your IAT sensor is instead of at the MAF housing, which at idle, should be nearly the same.
Eric
From what I know of the SD code, the temp compensations are the same as if you were running a MAF, except that the temp is measure where your IAT sensor is instead of at the MAF housing, which at idle, should be nearly the same.
Eric
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Sep 10, 2009, 08:14 PM
#8
Is your WOT affected by half a point, too, or just idle? If just idle, I would chalk it up to normal variance and start running in closed loop and let the trims do their job.
From what I know of the SD code, the temp compensations are the same as if you were running a MAF, except that the temp is measure where your IAT sensor is instead of at the MAF housing, which at idle, should be nearly the same.
Eric
From what I know of the SD code, the temp compensations are the same as if you were running a MAF, except that the temp is measure where your IAT sensor is instead of at the MAF housing, which at idle, should be nearly the same.
Eric
Sep 10, 2009, 08:15 PM
#9
I thought someone mentioned that the stock air temp tables compensated for air temp? I assume this is the "relative air density vs temp for airflow/hz" table. It is strangely odd however, going cold would provide more dense air to the motor and it *should* lean out. That it however unless the stock air temp compensation table is a little conservative and/or it is just a bit too much compensation for the SD.
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