ray,
thanks for your post and jon your input.i have one more question.i live in northern illinois and it can be below 0 for a few days and in the 0 to teens the rest of the time.should i leave my k&n setup on in the winter or could the cold affect my truck in some way? now i got some reading to do . thanks again guys.
mike
--- On Sat, 9/18/10, Ray Block <BPracing@wowway.com> wrote:
> From: Ray Block <BPracing@wowway.com>
> Subject: RE: DML: Re: K&N fipk
> To: dakota-truck@dakota-truck.net
> Date: Saturday, September 18, 2010, 12:28 PM
>
> > -----Original Message-----
> > From: MICHAEL CABE
> >
> > ray
> > i will check out all those links. thank you.i guess my
> thought is,even
> > with modest mods (exhaust,air intake)are the factory
> settings in the
> > computer able to make the best of said mods without
> some sort of
> > reprogramming?
>
> The short answer is yes. In part throttle
> driving the PCM will read the O2
> sensor, Intake Air Temp (IAT) sensor, MAP sensor and the
> Coolant Temp Sensor
> (CTS) to determine the proper Air/Fuel ratio regardless of
> any mods.
>
> During Wide Open Throttle (WOT) the PCM ignores the O2
> sensor and refers to
> predetermined parameters (lookup table) to adjust the
> timing and A/F ratio.
> Typically, all factory computers (ECM or PCM, whatever you
> want to call
> them) are programmed to be extra rich at WOT to prevent we
> idiots from
> causing any engine damage. For a racer this can be
> detrimental to maximum
> performance but there are external ways to
> compensate. A mostly street
> vehicle wouldn't know the difference.
>
> > i haven't looked at your links yet so maybe after
> doing so
> > i will understand more about "speed density systems"my
> next question is to
> > the group.have any of you reprogrammed for fuel
> economy or performance or
> > both? i would like to stick to the 4.7 on this
> subject but all
> > experiences too.thanks again ray.
> > mike
>
> I acquired a Superchips tuner several years ago for my Jeep
> 4.7. (same one
> is used for Dodge truck 4.7s) I've tried the
> "economy" and "performance"
> modes. The fuel mileage difference is
> negligible. The performance mode
> does show a slight performance improvement at the track but
> it is not
> significant enough to "feel" on the street.
>
> FWIW, when I race the Jeep without the tuner I use 87
> octane fuel. Higher
> octane didn't do anything for it. If I use
> the Superchips performance mode
> I run 92 but can't confirm it really needs
> it. I've run just as good times
> with 89 in most weather conditions.
>
> Hope this helps.
> Ray
>
>
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