Mike, I live in central Ohio and it gets cold here too. (but we don't
usually have your wind) I leave my K&N on year round with no ill effects.
While the engine is cold to warming up it will never see any difference.
Once the engine is totally warm it will just see the air as exceptionally
cold. I've not run back to back tests to see if this is good or bad with
regard to fuel mileage but it sure is good for performance. I ran my best
ever ET & speed in the quarter mile last December 12th while it was 35
degrees out. (special race at a local track. The tracks around here usually
close around Nov 1.) BTW, this confirms what my scanner has been telling
me about the 4.7 running very rich at WOT. When your performance improves
in cold weather your A/F ratio is rich. If you slowed in cold weather it
would be too lean.
Ray
> -----Original Message-----
> From: owner-dakota-truck@bent.twistedbits.net [mailto:owner-dakota-
> truck@bent.twistedbits.net] On Behalf Of MICHAEL CABE
> Sent: Saturday, September 18, 2010 6:39 PM
> To: dakota-truck@dakota-truck.net
> Subject: RE: DML: Re: K&N fipk
>
>
> 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
> >
> >
This archive was generated by hypermail 2b29 : Mon Nov 01 2010 - 10:47:31 EDT