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# VE Table Airflow Correlation to Horsepower?

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# VE Table Airflow Correlation to Horsepower?

03-03-2016, 07:52 PM
#21
TECH Senior Member

Join Date: Apr 2002
Location: So.Cal.
Posts: 6,071

Also as a side note, VE can be calculated from MAF as follows:
VE[g*K/kPa] = MAF[g/s] * DAT[K] * 120[s*rev/min] / RPM[rev/min] / MAP[kPa] / N

and for N=8 cylinders this becomes:
VE[g*K/kPa] = MAF[g/s] * DAT[K] * 15[s*rev/min] / RPM[rev/min] / MAP[kPa]

where DAT[K] is dynamic air temperature (air temperature corrected/modelled for manifold heatsoak).

The implication of this is that you can correct the MAF (with VE disabled) and calculate a new VE from it ( if the injector tables are correct )

In EFILive there is also a VETABLE lookup pid which allows you to do the inverse of the above, i.e. correct the VE (with MAF disabled) and calculate a new MAF from it.

Last edited by joecar; 03-03-2016 at 07:59 PM.
03-08-2016, 09:57 AM
#22
TECH Senior Member

Join Date: Apr 2002
Location: So.Cal.
Posts: 6,071
VE Table Airflow Correlation to Horsepower?

Originally Posted by joecar
...

( and note that rearranging the IGL P*V=(m/M)*R*T gives m*T/P=V*M/R ).
m*(T/P) = V*(M/R) is the cylinder volume converted to airmass in normalized form (normalized for absolute temperature and absolute pressure).
03-08-2016, 02:10 PM
#23
Super Hulk Smash

Join Date: Aug 2004
Location: Pace, FL
Posts: 10,784

That's awesome, Joe.

I'll see if I can map that into HPTuners with some custom PIDs. I know it's possible in EFILive.

Last time I tried in HPT, I kept getting an error.
08-06-2016, 02:35 AM
#24
Teching In

Join Date: Jul 2016
Posts: 42

Any update, progress with an algorithm to display VE table in units of g/sec in HPTuners ?
08-06-2016, 10:07 PM
#25
TECH Regular

Join Date: Jun 2012
Location: SV, AZ
Posts: 414

Originally Posted by Fullpower
Any update, progress with an algorithm to display VE table in units of g/sec in HPTuners ?
The scanner does this while logging.