Have a 6NZ cat(03 model 550 gutless) looking to get around 75-100 more horsepower. Where do I set the Fls and Fts, and also whats a good number on the trim codes? Thanks in advance![]()
Cat 6nz help help
Discussion in 'Trucks [ Eighteen Wheelers ]' started by loudhornsrule, Jan 29, 2009.
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Not to be rude.........But you got some reading to do

There is pages and pages of good reading on the 6nz after you done reading I don't think you will have anymore questions
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Guy's been a member for ALL of 2 months. Not sure that was the polite responce, kinda like what I got on my first post. Been pulling wrenchs on diesel since the days of the 4-71's so do have a bit of knowledge to inpart but not sure I want to do that here. Not bi^&$(*#, just trying to be polite.
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Like I said I wasn't trying to be rude,I was a member here for 7 weeks and read up on all the old posts before I asked any questions.
I have a folder full of part numbers and info thats worth $$$$$$$ in my option all I was meaning was to read up first,most of these VERY knowledgeable people on here will soon get tired repeating the same answers.
Again sorry if that came across rude. -
i have the 5232 right now it does verry good job , but when i get a chance i'm going to try 6999, and set FLS-127 FTS-0
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Wasn't trying to "pull your chain" 850, please don't take it that way. I just saw the same enviroment that greeted my first question, at last look still no responces.. Not that I won't take ALL the info that I can get, some of us are more interested in one particular series than the others. After the time I have been here I finally got some time yesterday to go back through the posts & still not all the way back. You're SO right, there is a wealth of info here, thanke to all for sharing as we are all in the same canoe, we all need to grab an oar or we won't get anywhere, besides, if only one grabs an oar we'll be going in circles.
Coalhauler, I have read repeatedly that the MPG takes a dive with the 6999 hearsay on this ens as I am still using the 5232, jus' sayin' -
FWIW, you dont hear of many gutless 6nz 550"s. if it were mine i would check everything before i went into ECM. fuel psi,flow,restriction,correct filters,CAC,CAC clamps,overhead,collapsing fuel lines and other simple things many overlook. just my .02
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The FLS and the FTS are electronic set with proper lap top
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loudhornsrule, Make a pot of coffee and read the post link below......tons of good info to be read from some pretty smart Cat guys.
http://www.thetruckersreport.com/tr...eighteen-wheelers/59392-cat-diesel-power.html
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