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

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...

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??

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...

Is the VE the pcm is referencing from the ve table loggable?

technically yes. But not in the current release.