The 6NZ had the old pump and Cat never admitted to much about the lack of fuel pressure in those...You find them shimmed all the time and with springs Stretched.
The spring kit I mentioned above is only for the later pumps with allen head plug.
CAT C15 ACERT 475hp MXS - low boost
Discussion in 'Trucks [ Eighteen Wheelers ]' started by mile-high, Aug 22, 2009.
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Truck is Kenworth T800 with RTLO-18918B, 4.10 axle ratio, 11.00 X 24.5 tire size,
does heavy haul and averages around 180K gross
Here are PARS DYNO results from the "Gov. Speed" and 1st, 2nd, 3rd & 4th Lugs:
Eng Speed (RPM) 1803, 1697, 1600, 1402, 1211
Manifold Pressure ("Hg) 67.9, 67.0, 67.0, 69.9, 63.3
Fuel Pressure (PSI) 89.3, 88.3, 87.5, 86.5, 83.8 -
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You are not missing anything PaulE
These later So called Higher volume Transfer pumps will go onto 6NZ or any other 3406E, C15, C16 C18 engine. Old engine, New engine
I only buy the later ones.
I simply identify them by the Relief plug on the side. The old type the plug is 5/8 spanner size and points towards the Chassis.
The later type have the Allen plug and its pointing towards the Chassis and the ground which is 45% so they are easy to identify at a glance.
The later pumps are 3166864 Clockwise
and the 3166863 Counter-Clockwise -
32lb is way low, what was it before? a 475 should have at least 40lb wonder why didn't they pick this up on the dyno... -
DYNO results re HP:
Eng Speed (RPM) 1803, 1697, 1600, 1402, 1211
Engine HP 465, 439, 441, 483, 415
Corrected Engine HP 485, 460, 463, 502, 431
Wheel HP-Measured 389, 397, 401, 413, 367
Corrected Wheel HP 405, 413, 418, 426, 377Last edited: Aug 24, 2009
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Below is a link to my dyno numbers after my rerate to a 550 and I have all ways had 50 to 55 pounds of boost, but if a IVA starts going bad I will drop 5 psi.
http://www.thetruckersreport.com/tr...-caterpillar-power-harness-54.html#post961598 -
Never any IVA codes? had a problem on my MXS with IVA codes and running rough. traced to injector harness plugs on side of engine. oil was entering engine side of plugs causing a poor connection. cleaned oil off plugs and engine ran great for 1-2 days til oil came back. Cat tech center told me oil had no effect on performance and to not worry about. I changed harness anyway and surprise it did effect performance. gained some power and .3-.4 mpg. IVA codes went away. guess Cat was wrong. -
Mile high! Cat sell H/P not fuel economy just so you know. Results from the par test look to be in cats range some what 80 percent of rated H/P! There are no pyro readings odd . Lets back up did you have WAGNER CAT do this par? Can you tell us if you have had any valve or injector failures? Im leaning towards exhaust fin damage in low pressure turbo or both. Looks like you got it covered now instead of a bill you want it fixed!
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As I understand it, problem recurred and you had to replace harness and that kept the performance gains. Did you just replace the injector harness?
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