it means you have to wait 16 minutes before you can start it.
What does it mean when this happens?
it means you have to wait 16 minutes before you can start it.
A few things, the main concern is the MAT or IAT sensor heat soaks with a lack of air transfer around it... that is until the engine is pumping again, this causes the MAT correction [remember SD uses MAT temps in the air density equation] to become lean on HOT start. To properly correct this without altering the running fuel correction [ this means we do NOT want to alter the MAT correction table after we are done tuning as this will require further fuel trim in the main table] we will go in and add fuel in a percentage to offset the sensor soak for the first minute of startup. We will do this in the ASE and ASE taper tables [after start enrichment and taper 'how long the ase stays in effect'] properly set the engine will not experience any lean condition at startup, as a driver you would not even notice it could be an issue.
What does it mean when this happens?
A few things, the main concern is the MAT or IAT sensor heat soaks with a lack of air transfer around it... that is until the engine is pumping again, this causes the MAT correction [remember SD uses MAT temps in the air density equation] to become lean on HOT start. To properly correct this without altering the running fuel correction [ this means we do NOT want to alter the MAT correction table after we are done tuning as this will require further fuel trim in the main table] we will go in and add fuel in a percentage to offset the sensor soak for the first minute of startup. We will do this in the ASE and ASE taper tables [after start enrichment and taper 'how long the ase stays in effect'] properly set the engine will not experience any lean condition at startup, as a driver you would not even notice it could be an issue.
The only way I was able to fight this was to alter the mat temp table. Didn’t take much, just a bit of adjustmentA few things, the main concern is the MAT or IAT sensor heat soaks with a lack of air transfer around it... that is until the engine is pumping again, this causes the MAT correction [remember SD uses MAT temps in the air density equation] to become lean on HOT start. To properly correct this without altering the running fuel correction [ this means we do NOT want to alter the MAT correction table after we are done tuning as this will require further fuel trim in the main table] we will go in and add fuel in a percentage to offset the sensor soak for the first minute of startup. We will do this in the ASE and ASE taper tables [after start enrichment and taper 'how long the ase stays in effect'] properly set the engine will not experience any lean condition at startup, as a driver you would not even notice it could be an issue.
Altering the mat air density curve is sometimes a necessary evil... different intake, sensor arrangements may even need different curves, especially if the sensor placement was altered.The only way I was able to fight this was to alter the mat temp table. Didn’t take much, just a bit of adjustment
I ended up changing over to a gm intake air temp sensor as well, and moved the sensor away from the #5 runner and into the upper intake plenum.
The only way I was able to fight this was to alter the mat temp table. Didn’t take much, just a bit of adjustment
I ended up changing over to a gm intake air temp sensor as well, and moved the sensor away from the #5 runner and into the upper intake plenum.
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