Regarding HPT's VE PID and calc....
Thread Starter
Launching!
Joined: Jan 2003
Posts: 269
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From: Northeast Baby!
Regarding HPT's VE PID and calc.... 1)HPTuners scanner allows you to scan VE under Engine->Airflow...know I'm assuming this is a calculated VE and does anyone know what other PIDs are required to be logged in order to get this PID??
2) From the "VE Table Cracked" - it seems as if there are two equations yet nobody seems to agree if nogo or gameovers is correct. Has there a concensus on an equation?? If so which one?
Tried search on both this forum and HPTuners yet to find a reasonable answer.
Thanks,
Jon
2) From the "VE Table Cracked" - it seems as if there are two equations yet nobody seems to agree if nogo or gameovers is correct. Has there a concensus on an equation?? If so which one?
Tried search on both this forum and HPTuners yet to find a reasonable answer.
Thanks,
Jon
FormerVendor
Joined: Jan 2003
Posts: 525
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From: Melbourne, Australia
The "VE" PID is only used for misfire calcs it is basically the amount of air in the cyl/ideal air. It is not a calculated PID as you are used to. We moved that PID to the Misfire DIagnostics section in 1.5 to avoid further confusion.
The PCM equation for VE is very simple g/cyl = VE * MAP / MAT(K)
VE = grams.Kelvin/kPa (table lookup)
MAP = kPa
MAT(K) = manifold air temp in degrees Kelvin. (Note: this is not IAT but calculated from a combo of IAT and ECT, in later OS's it can be switched to be purely IAT)
Note: currently we display the VE values as as % of maximum theoretical airmass. In future we will have the choice of displaying the native GM units of g.K/kPa. Either way when we released our product we figured g.K/Kpa made even less sense to people than %.
Chris...
The PCM equation for VE is very simple g/cyl = VE * MAP / MAT(K)
VE = grams.Kelvin/kPa (table lookup)
MAP = kPa
MAT(K) = manifold air temp in degrees Kelvin. (Note: this is not IAT but calculated from a combo of IAT and ECT, in later OS's it can be switched to be purely IAT)
Note: currently we display the VE values as as % of maximum theoretical airmass. In future we will have the choice of displaying the native GM units of g.K/kPa. Either way when we released our product we figured g.K/Kpa made even less sense to people than %.
Chris...
Thread Starter
Launching!
Joined: Jan 2003
Posts: 269
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From: Northeast Baby!
Thanks you.
Any plans on making a PID for VE or is there anyway to make your own custom PID.
If the PCM equation is g/cyl=VE*MAP/MAT how would I make calculations since the MAT is derived value??
Any plans on making a PID for VE or is there anyway to make your own custom PID.
If the PCM equation is g/cyl=VE*MAP/MAT how would I make calculations since the MAT is derived value??
FormerVendor
Joined: Jan 2003
Posts: 525
Likes: 0
From: Melbourne, Australia
The histogram displays in the scanner will automatically calculate g/cyl from MAF for you.
MAT is not loggable in the scanner at this time, i can put it on the list for future.
Chris...
MAT is not loggable in the scanner at this time, i can put it on the list for future.
Chris...
