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CAT dyno numbers

Discussion in 'Trucks [ Eighteen Wheelers ]' started by companyman, Jan 19, 2012.

  1. Jan 19, 2012 #1
    companyman

    companyman Heavy Load Member

    747
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    Nov 17, 2011
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    I am having a truck dynod im buying. Its an 06 cat mxs 475.

    I read that the accerts have alot of blowby. Could anyone tell me what good/ acceptable/ bad numbers would be for blowby and hp?
     
    companyman, Jan 19, 2012
    companyman, Jan 19, 2012
    #1
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  3. Jan 20, 2012 #2
    KaptainKenworth

    KaptainKenworth Bobtail Member

    33
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    Jan 19, 2012
    Alberta Canada
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    with a tandem axle that truck should be putting about 430hp to the ground.. as for blowby anything over 800-900 cfm is getting high.. the actual calculation is HP x 2 + 200 for the max blowby rating..
     
    KaptainKenworth, Jan 20, 2012
    KaptainKenworth, Jan 20, 2012
    #2
  4. Jan 21, 2012 #3
    companyman

    companyman Heavy Load Member

    747
    122
    Nov 17, 2011
    0
    I got the dyno numbers. They are calling it good but it seems low hp to me.

    Its putting 340 to the ground which is like what 72% of rated.

    He did say this is an ex marten trk and there is some settings they could change to get more from it.

    The blowby is not in the numbers you gave he said its +3. Said they allow +1 for every 100k mi and this is 580k mi. So its half of what would be allowable.
     
    companyman, Jan 21, 2012
    companyman, Jan 21, 2012
    #3
  5. Jan 21, 2012 #4
    little cat 500

    little cat 500 Road Train Member

    2,060
    1,106
    Jan 17, 2010
    Abbottstown PA
    0
    id say your 80 to 100 hp down not sure on the blowby but the hp is way low for a 475
     
    little cat 500, Jan 21, 2012
    little cat 500, Jan 21, 2012
    #4
  7. Jan 21, 2012 #5
    companyman

    companyman Heavy Load Member

    747
    122
    Nov 17, 2011
    0
    About 75. It calculates out to about 400 at the flywheel. I am tempted to have them set the overhead and change the fuel filter and run it again. It has fleetgard filters which i hear are a big no no on the acert. And i have bought a few fleet trucks and its my opinion none of the fleets EVER adjust the overhead. My last truck was so bad im surprised it ran at all. Also i thought i felt a boost leak from a boot when i looked at it but it was so cold out my hands went numb every time i started looking for it.
     
    companyman, Jan 21, 2012
    companyman, Jan 21, 2012
    #5
  8. Jan 21, 2012 #6
    KaptainKenworth

    KaptainKenworth Bobtail Member

    33
    18
    Jan 19, 2012
    Alberta Canada
    0
    Before it goes on the dyno all of that should have been checked unless it just an engine condition dyno.. .Boost/exhaust leaks and valve set is critical..i only recommend cat filters on them ( they flow soooo much better).. primary fuel filter bases can also cause fuel restriction depending on the model of it..

    uprateing might be a fix (approx $ 500 plus labor) but if you have a lazy 475 you will have a lazy 550.

    should to go through all the low power checks then dyno it.. if they #s are low and they are PAR certified they can adjust the FLS and FTS to give it more fuel rate..Heavy haul program and resistors may help as well
     
    KaptainKenworth, Jan 21, 2012
    KaptainKenworth, Jan 21, 2012
    #6
  9. Jan 21, 2012 #7
    companyman

    companyman Heavy Load Member

    747
    122
    Nov 17, 2011
    0
    Yes it was just an engine condition check dyno.

    Ibwouldnt bother with hp upgrades untill its all in proper tune. Oh well, i will get it figured out
     
    companyman, Jan 21, 2012
    companyman, Jan 21, 2012
    #7
  10. Jan 22, 2012 #8
    PaulE

    PaulE Medium Load Member

    413
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    Jan 15, 2009
    Verona Wi
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    Fleetgaurd filters are not a no no on an Acert as long as you run the right one. They have much higher flow rates available than what Cat has. the info is out there you just have to look.
    OP, what RPM was the peak HP at ?
     
    PaulE, Jan 22, 2012
    PaulE, Jan 22, 2012
    #8
  11. Jan 22, 2012 #9
    Mr. Haney

    Mr. Haney Road Train Member

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    Dec 17, 2008
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    companyman

    I got your PM, but ended up deleting it without answering it. My Inbox was full and I was trying to make room to be able to answer your question when I deleted it without responding. I'm sorry

    The dyno numbers are low. The CAT dealer shouldn't have told you that it was Okay at 340 hp. A 475 should be able to put a minimum of 380 hp to the rollers in a power dyno run. The problem is they should have done a PAR dyno run afterwards to measure the actual fuel being consumed by the engine verses the Hp being produced for a accurate Hp evaluation of the power output. A simple power run gives the dyno operator an idea that he has a problem to look at or not
     
    Mr. Haney, Jan 22, 2012
    Mr. Haney, Jan 22, 2012
    #9
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