RE: RE: RE: Cold engine puts out more hp/tq...

From: Brian (hskr@cox.net)
Date: Tue Sep 23 2008 - 19:29:40 EDT


I will agree with that when in closed loop and cruising at a constant speed.

brian cropp
-----Original Message-----
From: owner-dakota-truck@bent.twistedbits.net
[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Phillip Batson
Sent: Tuesday, September 23, 2008 4:31 PM
To: dakota-truck@dakota-truck.net
Subject: Re: DML: RE: RE: Cold engine puts out more hp/tq...

This is why
modifying an IAT sensor really doesn't do a whole lot to mileage unless you
go way out of the normal/expected range.

On the fuel adaptives...there are 26 different tables which correspond to
MAP and Engine Speed. All of them use calculation formula.

- Bernd

-----Original Message-----
From: Phillip Batson [mailto:pbatson68@yahoo.com]
Sent: Saturday, September 20, 2008 11:12 AM
To: dakota-truck@dakota-truck.net
Subject: DML: RE: Cold engine puts out more hp/tq...

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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