R
rich91080
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I they gave me a answer.
here it is.
Hi Richard,
OK, as I understand it the MAF sensor reading are used to determine the
required fuel under steady state conditions. Under these conditions the PCM
uses VE tables are used as a sanity check for the MAF sensor reading by
calculating the expected mass air flow and comparing it to the actual MAF
reading.
Under changing conditions where the vehicle is accelerating, decelerating or
the load is changing significantly the PCM essentially goes into speed
density mode and uses the VE tables to calculate the required fuel. Once
conditions stabilize the PCM goes back to using the MAF sensor readings. I
believe this is done because the MAF sensor are relatively slow to react to
quick changes in air flow.
Best regards,
TC
-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Wednesday, November 02, 2005 3:17 PM
To: [email protected]
Subject: OBDI and OBDII
My name is Richard I currently have both tuning programs for OBDI
and OBDII. I was wondering if I could get a detail description on the
function of the VE Volumetric efficiency tables in both ODB. I done a
lot of searching and I only came up with just SD mode. I am more
interested in the use of the VE tables and that MAF. Does the MAF
sensor reference the VE tables during normal driving, and when is the
VE table accessed? If possible is there a blue print of the usage of
the tables that I could but or download? If not could someone explain
the function of the VE table?s in detail? I was told to ask a gentleman
named John that works for Tunercat.
Thank You
Richard
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here it is.
the actual emanilMy name is Richard I currently have both tuning programs for OBDI
and OBDII. I was wondering if I could get a detail description on the
function of the VE Volumetric efficiency tables in both ODB. I done a
lot of searching and I only came up with just SD mode. I am more
interested in the use of the VE tables and the MAF. Does the MAF
sensor reference the VE tables during normal driving, and when is the
VE table accessed? If possible is there a blue print of the usage of
the tables that I could buy or download? If not could someone explain
the function of the VE tables in detail? I was told to ask a gentleman
named John that works for Tunercat.
Hi Richard,
OK, as I understand it the MAF sensor reading are used to determine the required fuel under steady state conditions. Under these conditions the PCM uses VE tables are used as a sanity check for the MAF sensor reading by calculating the expected mass air flow and comparing it to the actual MAF
Under changing conditions where the vehicle is accelerating, decelerating or
the load is changing significantly the PCM essentially goes into speed
density mode and uses the VE tables to calculate the required fuel. Once
conditions stabilize the PCM goes back to using the MAF sensor readings. I
believe this is done because the MAF sensor are relatively slow to react to
quick changes in air flow.
Best regards,
TC
Hi Richard,
OK, as I understand it the MAF sensor reading are used to determine the
required fuel under steady state conditions. Under these conditions the PCM
uses VE tables are used as a sanity check for the MAF sensor reading by
calculating the expected mass air flow and comparing it to the actual MAF
reading.
Under changing conditions where the vehicle is accelerating, decelerating or
the load is changing significantly the PCM essentially goes into speed
density mode and uses the VE tables to calculate the required fuel. Once
conditions stabilize the PCM goes back to using the MAF sensor readings. I
believe this is done because the MAF sensor are relatively slow to react to
quick changes in air flow.
Best regards,
TC
-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Wednesday, November 02, 2005 3:17 PM
To: [email protected]
Subject: OBDI and OBDII
My name is Richard I currently have both tuning programs for OBDI
and OBDII. I was wondering if I could get a detail description on the
function of the VE Volumetric efficiency tables in both ODB. I done a
lot of searching and I only came up with just SD mode. I am more
interested in the use of the VE tables and that MAF. Does the MAF
sensor reference the VE tables during normal driving, and when is the
VE table accessed? If possible is there a blue print of the usage of
the tables that I could but or download? If not could someone explain
the function of the VE table?s in detail? I was told to ask a gentleman
named John that works for Tunercat.
Thank You
Richard
__________________________________________________________________
Look What The New Netscape.com Can Do!
Now you can preview dozens of stories and have the ones you select
delivered to you without ever leaving the Top Home Page. And the new
Tool Box gives you one click access to local Movie times, Maps, White
Pages and more. See for yourself at
http://netcenter.netscape.com/netcenter/
cool