For those of you with HPTuners...
Thread Starter
Joined: Nov 2001
Posts: 422
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From: Washington Crossing, PA
For those of you with HPTuners... ...and are logging Dynamic Cylinder Airflow. Is this an actual parameter from the PCM or is it a calculated value within the HPTuner scan software? I can't seem to find a similar parameter in other scanning software. Surprisingly, a search on this website and others has produced no useful results.
Can anyone offer any insight?
Can anyone offer any insight?
I'm going to guess it is an actual parameter in the PCM since the timing table (and others) are referenced against g/cyl. Not sure what goes into the calculation though...
When you right click the table display to insert parameters, it will list all the parameters available to you in nice groupings.
Near the bottom of the PID list you will see: User Defined.
This group has all the user defined "calculated" PID's that are pre-defined or created by you.
Calculated Cyl Air is a user defined PID but Dynamic Cylinder Air is not.
You can use Dynamic Cyl Air to log your g/cyl if your MAF is disconneted (or you are not logging MAF).
The calc cyl air PID will use your MAF to calculate a cyl/air value.
Near the bottom of the PID list you will see: User Defined.
This group has all the user defined "calculated" PID's that are pre-defined or created by you.
Calculated Cyl Air is a user defined PID but Dynamic Cylinder Air is not.
You can use Dynamic Cyl Air to log your g/cyl if your MAF is disconneted (or you are not logging MAF).
The calc cyl air PID will use your MAF to calculate a cyl/air value.
What other software are you referring to if its EFILive the parameters name is GM.DYNCYLAIR_DMA and its under the System ---->> Tune on the drop down pid list. THere is one for SD and one for MAF operation.
Dynamic air is GM>DYN_AIR and that is located under the System --->>> Air
Dynamic air is GM>DYN_AIR and that is located under the System --->>> Air
Thread Starter
Joined: Nov 2001
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From: Washington Crossing, PA
Originally Posted by HumpinSS
What other software are you referring to if its EFILive the parameters name is GM.DYNCYLAIR_DMA and its under the System ---->> Tune on the drop down pid list. THere is one for SD and one for MAF operation.
Dynamic air is GM>DYN_AIR and that is located under the System --->>> Air
Dynamic air is GM>DYN_AIR and that is located under the System --->>> Air
Thread Starter
Joined: Nov 2001
Posts: 422
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From: Washington Crossing, PA
Originally Posted by HumpinSS
...THere is one for SD and one for MAF operation.
The maf pid most likely uses data from the maf to calculate cylinder air where the sd pid is using the ve table to come up with the air value
The main site is down fo upgrade but the forums are still up
www.efilive.com/forum
The main site is down fo upgrade but the forums are still up
www.efilive.com/forum
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It sounds like both are just "made up" values...I mean, not really, but if they are both referencing tables to come up with a value, then they would only be as good as the table calibration.
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Verdad Gallardo Thread Starter
Joined: Nov 2001
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From: Washington Crossing, PA
Originally Posted by MeentSS02
It sounds like both are just "made up" values...I mean, not really, but if they are both referencing tables to come up with a value, then they would only be as good as the table calibration.
The DMA denotes direct memory access so no that is what the PCM sees and uses not what the scanner calculates and tells the user. The computer still needs to figure out air someway somehow or it wouldnt know how and when to time the engine since the spark tables are indexed by air...
Thread Starter
Joined: Nov 2001
Posts: 422
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From: Washington Crossing, PA
Originally Posted by HumpinSS
The DMA denotes direct memory access so no that is what the PCM sees and uses not what the scanner calculates and tells the user. The computer still needs to figure out air someway somehow or it wouldnt know how and when to time the engine since the spark tables are indexed by air...
Thread Starter
Joined: Nov 2001
Posts: 422
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From: Washington Crossing, PA
Originally Posted by Fran D
OK, so what I gather by this, and your previous post (re., MAF & SD PIDs), is the dynamic cylinder airflow is not a measured parameter, but the lookup table that either the MAF (i.e., frequency vs. gms/sec) or the SD (VE vs. RPM vs. MAP) PIDs are referenced to. Correct?
Thread Starter
Joined: Nov 2001
Posts: 422
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From: Washington Crossing, PA
Originally Posted by P Mack
From what I understand, it is the MAF reading corrected for the speed density calcs. It filters both inputs to come up with a number.
What controversy are you talking about? Some people choose SD, some people don't.
http://www.hptuners.com/forum/showthread.php?t=2359
http://www.hptuners.com/forum/showthread.php?t=2359
