So Tim, from your conclusion the truck PCM is always in a learning state.
Is this what you are saying? If this is true, I have been running a small
pattern analysis myself with the 5 speed auto and found the same.
I have been using the 1st, 2nd and then shift it to D when reach RPM
redline. I feel the ump off the line and in the rear but when returning to
the leave it in D versus using the gears on some days, it runs sluggish than
before.
-------------------------------------------
Steven St.Laurent
Test Engineer
Test Branch, GSD, MCTSSA
MARCORSYSCOM, USMC
760-725-2506 (DSN 365-2506)
Work:mailto:stlaurents@mctssa.usmc.mil
Home:mailto:saint1958@home.com
-----Original Message-----
From: Tim J Koth [mailto:Tim.J.Koth@aexp.com]
Sent: Wednesday, September 20, 2000 8:55 AM
To: dakota-truck%buffnet.net
Subject: DML: Why the stock 4.7 air hat is special
I have a completely non-scientific observation relating to this. I have a
po-boy on my 2K 4.7 4x4 5speed. I removed it recently and put it back to
stock
because I had to take it in the shop with the check engine light on. When I
had first put the po-boy on, I reset the computer like everyone said I
should
and drove for a while. It seemed to lose a little low-end right off the bat,
but not alot. But after driving for 5000 miles and then putting the stock
one
back on I can tell you that I lost a wazoo-load of both low and upper end by
going back to the factory air setup. I drove it that way for about 500
miles
and have now put the po-boy back on. This time I did not reset the computer.
Well we are back in the learning stage and the truck is getting faster and
more responsive again the more I drive it. I think if you want it to get
stronger you have to drive the hell out of it :-) Thats just the way
my truck seems to be anyway....
--- previous post ---
Date: Tue, 19 Sep 2000 19:05:07 -0700
From: Marty Galyean <mgalyean@acm.org>
Subject: Re: DML: Why the stock 4.7 air hat is special
This isn't science fiction. The 'ram effect' is, and always has been,
accoustics and works just as I have written. People who think the ram
effect has something to do with a scooping in vast amounts of air with
a scoop or whatever don't have a clue. The ram effect is an accoustic
effect. It has been for decades and decades. Look at the stock 4.7
air hat. It has an accoustic chamber to lower the resonance. Do you
need an engineer to tune a guitar? Do you need an engineer to learn
the best throttle position for acceloration at various rpms? Why
would one need an engineer to determine if the butterfly had a decent
effect and to learn the best rpm crossover to kick it in? Just use
the oft referenced butt-o-meter as per norm or a g-tech.
They are not my ideas to knock, but I appreciate the sentiment.
I just put the idea out there. I leave it as an exercise for the
reader to find any value in it. :-)
GSWillhite wrote:
> Hey Marty, dosen't this sound a little extreme. I think
> we would need a flowbench and other test equipment to answer
> this question. I will say that Flowmaster on the exhaust end
> has experimented with pressure waves and its effects on moving
> exhaust gases. Might give their engineers a call unless someone
> on the dml can answer this. Not knocking your ideas etc, but you
> need a lab to play with. :)
>
> GS -
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