Are any of those variables calculated or are they all readings from sensors on the truck?
Another way to ask this is, does the computer just take sensor readings and plug them in for the calculation, or does it have something like reference tables in its programming to calculate certain values that may exceed certain limits? So, if it gets a reading for say, upstream 02, and it is outside some set range, does it modify what it plugs into the equation?
If so, that would really limit the 'effect' any one variable has on the equation if there are limits setup for different (or maybe all) variables.
----- Original Message ----
From: Bernd D. Ratsch <bernd@dodgetrucks.org>
To: dakota-truck@dakota-truck.net
Sent: Friday, September 19, 2008 8:58:52 AM
Subject: DML: RE: RE: RE: RE: RE: RE: Cold engine puts out more hp/tq...
Yup...while yes it can, it depends on quite a few other conditions - not
just intake air temp.
(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
That's the formula. The ignition timing is also affected by IAT (but not
just by itself) so engine and weather conditions do apply. Higher/Lower
pressure, engine coolant temp, engine rpm, battery voltage, throttle
position...so you're trying to tell me that they don't matter??? What about
what the O2's read - think about those variables and how the PCM reacts too.
Fuel mileage is dependent on a lot of variables - yes...the difference in
between a 30 degree outside ambient and 90 degree outside ambient will
affect mileage slightly, but again...pcm calculations need to be figured
out.
- Bernd
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