Matt,
We ran the truck 3 times and took the "coldest run".. All of the spikes
were similar run to run. Spikes Ive seen are usually at the shift points
for an auto or at the rev limit RPM due to shut off conditions... I was very
impressed with the output of Steve's 4.7, especailly since its and automatic
with more drivetrain losses than a stick! Id be interested to know what the
diameter of your TB is (65 or 68mm?)
Bruce
----- Original Message -----
From: <WMBARRET@aol.com>
To: <dakota-truck@buffnet.net>
Sent: Wednesday, December 20, 2000 9:50 AM
Subject: Re: DML: 4.7 Dyno Run - Matt
> Steven, Get in contact with Dave Hughes (Hughes Engines) he has the intake
> for a 4.7L that I sent him not sure if he has looked at it yet. As for the
> latest dyno pull, I did'nt notice any dip at that rpm range on all 3 runs,
> there was one on one of those runs, but you cannot go by one run on a
dyno.
> Thats a common misconception, alot times you'll have "spikes" in a dyno
graph
> that will through the peak numbers way off, I have seen a few on the net
were
> folks claim they have X amount of power, but if you look at their graph it
> has a spike in it, spikes like these are not normal to an engine. You need
> atleast 2 runs, and should have 3 runs to get an average. My latest runs
> posted these numbers, notice peak TQ in the low 3000 rpm range. Nice low
end
> TQ, followed by alot of mid and high rpm HP, makes for a nice combo on the
> strip ;)
> rpm rwhp rwtq
> 2000 100 240
> 2500 115 250
> 3000 160 280
> 3250 180 292
> 3500 190 290
> 4000 215 280
> 4500 216 250
> 4700 216.5 240
> 5000 212 220
> 5500 180 170
> 6000 130 110
>
> Matt Y2K-HEMI
> '00 RC 4.7L 5 spd
> 14.23 @ 94.49
>
>
>
> In a message dated Wed, 20 Dec 2000 10:18:26 AM Eastern Standard Time,
> Stlaurent Mr Steven <STLAURENTS@mctssa.usmc.mil> writes:
>
> << Matt, I have noticed on your dyno sheets and now mine, we share a
torque
> line through out the RPM range and beneath it the horsepower never seem to
> cross at any point. These two lines never seem to intersect from the
> beginning to the end. Something I haven't seen before on the 5.2 and 5.9.
>
> Yahoo! You can gun the motor and have that available torque at any RPM
> range. The engine designer was right on the 4.7.
>
> Also I have noticed with all the 4.7 dyno runs, there is a slight dip on
> both the HP/TQ line at 2700 through 3000 RPM. I need to have Bruce figure
> what is going on or contact Mike (Chrysler engineer) for answer.
>
> After this the next item to tinker with is that nylon intake. I will need
> to purchase one from Chrysler and see what can be done.
> -------------------------------------------
> 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
>
>
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