Sorry, but I have seen two different Dyno ticket, both stock on a 5 speed
and an auto. The 5 speed was rated around 207HP and the auto was rated
around 185.84 (CA 230HP version). I don't do the math but look the output
tickets. The Dynojet equipment out in a local Escondido (CA) speed shop is
fairly new. I really don't know what equipment Kenne uses for his testing
but there is a big difference. I wonder what is the tolerance level of error
is on his machine?
I witness already three Daks with the 4.7 and they have almost the same
output. In the comparison of Golden West Powerdyne testing on the 5.9. I
would expect a greater HP expectation from the 4.7 versus the 5.9 by at
least 5-7 percent on the rear wheel HP. With a 12PSI boost on the Powerdyne
it pushes the 5.9 to 376 rear wheel HP but then a 4.7 with the same mods
will push the same or more with less driveline lost.
Matt's has a Dyno ticket (5 speed, RC, 3.93 gear) and confirms my earlier
suspicion why the 4.7 just as quick as the 5.9 R/T. His Dyno ticket said
the same as the local Daks here within less than 1.0 percent error margin.
However, I don't which version of Dyno equipment it was done on.
This is why I am asking...
-------------------------------------------
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: Jeff Crook [mailto:Jeff.Crook@ecitelebn.com]
Sent: Monday, July 31, 2000 11:03 AM
To: dakota-truck@buffnet.net
Subject: DML: pics of my truck ATTN: Steve
Steve,
unless my math skills have degraded terribly, 235 - 183.3 = 51.2 or a 22%
loss
( Jack's example of a 250 HP R/T putting 190 RWHP is a 24 % loss)
263.3 measured RWHP *1.22 = 321 estimated flywheel HP.
You seem to imply that Kenne-Bell's dyno graph of my truck is inaccurate,
and I wonder why
Anybody have any Dyno's of a stock 00 CC ,4.7, 3.93 rear for comparison?
I do, however, agrree that driveline losses thru the R/T trans and driveline
will be different from ours.
http://www.t-e.com/kb/jeff-dakota.htm
Steve wrote:
>>Incorrect statement since the tranny and drive shaft are not the same from
>>the 5.9 to the 4.7 model. The lost for a 4.7 five speed is around 11.54
>>percent and the auto version is only 19.2 percent drive lost. My truck
will
>>be dynode by JBA for the before and after installation of the prototype
>>headers.
>>I had to laugh when I seen Kenne Bell Dyno specs and seen others that
>>already had there 4.7 done on a Dynojet machine. Big differences!
Jack Hilton wrote:
>>A stock Dakota R/T will put right around 190 HP to the ground, depending
on
>>if it is a RC or a CC (more distance in a CC for the HP to travel down the
>>driveshaft)
>>based on the few dyno sheets I have seen, and shows that have dynoed stock
>>R/Ts.That means that if you take the stock manufacturer's rating of 250HP,
>>that you are looking at about a 26% loss of HP in the tranny, driveline,
>>and associated friction.
>>If you apply that same percentage to this SC 4.7 (yes it is) then you get
a
>>flywheel SAE Net HP rating of about 346 HP.
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