Efi Live Ve Table
06-08-2005, 03:13 PM
#1
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Efi Live Ve Table okay, i have modified my PE table and leaned my car out and then i have turned off the cat converter protection so that i don't go rich at WOT. Now I want to tune my car with the VE table because i hear that is the next step. How do i do this properly WITH EFI LIVE. All i see is with HPTuners
I have read this : VE Table Cracked
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I have been working on the VE table quite a bit lately and I think I found the solution.
Thanks to gameover for some key hints.
The VE table looks as though it is in meters cubed, it is just not used like a conventional VE table. The VE values are such that the PCM can directly backcalculate to g/cyl, the primary means to determine fueling and timing.
This is what makes it so confusing. You can't solve for air mass, you have to solve for g/cyl.
Anyhoo, here is the equation
VE = ((massflow * IAT / (MAP * RPM * Displacement))
Massflow: grams/sec
IAT: Degrees Kelvin
MAP: Bar
RPM: Duh!
Displacement: Cubic Meters
To solve for the massflow in g/sec simply re-arrange the equation.
Massflow = (VE * MAP * RPM * Displacement) / IAT
My old method of "Divide by 30" works okay because we are inadvertantly solving for a volume ratio. The molar mass of air is 28.96 g/mol.
I have compared the above equation to every bit of data that I have ever collected for a stock car, and the data matches up perfectly.
Any corrections, comments, or blinding errors please let me know.
Thanks,
Kevin
is that how you get the whole table and to where your ltrims to 0??
I have read this : VE Table Cracked
--------------------------------------------------------------------------------
I have been working on the VE table quite a bit lately and I think I found the solution.
Thanks to gameover for some key hints.
The VE table looks as though it is in meters cubed, it is just not used like a conventional VE table. The VE values are such that the PCM can directly backcalculate to g/cyl, the primary means to determine fueling and timing.
This is what makes it so confusing. You can't solve for air mass, you have to solve for g/cyl.
Anyhoo, here is the equation
VE = ((massflow * IAT / (MAP * RPM * Displacement))
Massflow: grams/sec
IAT: Degrees Kelvin
MAP: Bar
RPM: Duh!
Displacement: Cubic Meters
To solve for the massflow in g/sec simply re-arrange the equation.
Massflow = (VE * MAP * RPM * Displacement) / IAT
My old method of "Divide by 30" works okay because we are inadvertantly solving for a volume ratio. The molar mass of air is 28.96 g/mol.
I have compared the above equation to every bit of data that I have ever collected for a stock car, and the data matches up perfectly.
Any corrections, comments, or blinding errors please let me know.
Thanks,
Kevin
is that how you get the whole table and to where your ltrims to 0??
06-08-2005, 03:54 PM
#2
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Do you have a WB, if you dont you will have to do it via LTRIMS and STRIMS. A ve table is a ve table is a ve table. The moethods listed for the HPTuners dialing in your ve table will work with Live.
Make maps for you LTRIMS and STRIMS
Then make a calc pid that will average LTRIMS and STRIMS
eg
"({SAE.LONGFT1}+{SAE.LONGFT2})/2" and the same for STRIMS
if a WB is used then there is plenty of documentation on the Lives Website to set up WB logging, Auto Tune and filtering....
Make maps for you LTRIMS and STRIMS
Then make a calc pid that will average LTRIMS and STRIMS
eg
"({SAE.LONGFT1}+{SAE.LONGFT2})/2" and the same for STRIMS
if a WB is used then there is plenty of documentation on the Lives Website to set up WB logging, Auto Tune and filtering....
