Alright, not knowing exactly what all of those values would be, how far out
would your battery voltage need to be to cause a problem? Can you give an
example of what each of those values should be, so we could understand the
extent of changing values and how they might efect the overall calulations?
BTW I have noticed the volt gauge has been running in the 15V range lately.
Jim Nelson
""Bernd D. Ratsch"" <bernd@dodgetrucks.org> wrote in message
news:FLEBLMGMFEJAHIGMOFLNKEIMCAAA.bernd@dodgetrucks.org...
>
> Ok, I know some of us really don't care about this, but others do think
> about this from time to time for tuning calculations.
>
> Here's how the PCM determines the Injector Pulse Width (SBEC/JTEC and NGC
> I/II/III).
>
> Pulse Width is determined by 4 factors:
>
> Load x Base PW x O2 x Adaptives
>
> SBEC/JTEC PCM
>
> (RPM/Max RPM) x (MAP Baro) x (TPS x ECT x IAT x Sensed Battery Voltage x
> LTFT) x (Upstream O2) x (STFT x LTFT) = PW
>
> NGC I/II/III & GPEC PCM
>
> (RPM/Max RPM) x (T-MAP Baro x EGR*) x (TPS x ECT x IAT x Sensed Battery
> Voltage x LTFT) x (Upstream O2) x (STFT x LTFT x Purge Vapor Ratio) = PW
>
> * If equipped
>
> So...there youhave it. Put that into your spreadsheet and viola...you now
> know the base Injector Pulse Width.
>
> Granted, there's a bit more to the LTFT and STFT values, but that's the
> basics.
>
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