Steven, I went back and looked at all 3 pulls, there was a dip in the first
pull, on the second dyno test the dip got better,flattened out some, and on
the third test it was gone at that rpm (2700-3000) however it moved up to
(3400-3700), but it is slight, a very,very small flat spot at 3400 rpms.
hmmm??? interesting.
Matt Y2K-HEMI
In a message dated Wed, 20 Dec 2000 1:36:06 PM Eastern Standard Time,
Stlaurent Mr Steven <STLAURENTS@mctssa.usmc.mil> writes:
<< All three of your dynos, mine two sheets, and others I have seen has a
small dip before 3000 RPM.
-------------------------------------------
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: WMBARRET@aol.com [mailto:WMBARRET@aol.com]
Sent: Wednesday, December 20, 2000 9:50 AM
To: dakota-truck@buffnet.net
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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