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Mufflers

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Oscar the KW, May 15, 2013.

Page 1 of 5
  1. May 15, 2013 #1
    Oscar the KW

    Oscar the KW Going Tarpless

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    May 19, 2011
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    As most of you are aware, Kenworth factory mufflers the exhaust enters and exits on the same end of the muffler. Years ago I cut the the end of my mufflers off and gutted them, did see an increase in fuel mileage and throttle response afterwards. I ran it like that for a couple of years before I got rid of everything under there and went straight from the Y-pipe to the stacks, I did not notice any difference in fuel economy or throttle response/power from doing that. After I put the bullydog tune in my ecm I now have a drone that is driving me crazy from 1300-1500rpm. I put resonators behind my sheilds on my stacks and it helped some, but it is still there and I am sick of it. If I put my factory gutted mufflers back on with a tuned ecm do you think that there will be a negative impact on fuel mileage or power?
     
    Oscar the KW, May 15, 2013
    Oscar the KW, May 15, 2013
    #1
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  3. May 16, 2013 #2
    AUSSIE DAVE

    AUSSIE DAVE Road Train Member

    1,032
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    Feb 21, 2010
    OZ - Brisbane
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    Based on what u have said , no . I don't think u will have a negative impact , or maybe a very small one, but the peace and quite would be better I think.
     
    AUSSIE DAVE, May 16, 2013
    AUSSIE DAVE, May 16, 2013
    #2
  4. May 16, 2013 #3
    CatPowerC15

    CatPowerC15 Medium Load Member

    347
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    Feb 18, 2010
    Siler City, NC
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    i forget the number of inches of back pressure, but the factory KW muffler is the worse. I've seen before and after dyno runs simply removing the muffler and its quite a difference. Get the Grand Rock M-922 and you'll love it. No too loud and no drone.
     
    CatPowerC15, May 16, 2013
    CatPowerC15, May 16, 2013
    #3
  5. May 16, 2013 #4
    Cowpie1

    Cowpie1 Road Train Member

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    4,651
    Nov 25, 2008
    Kellogg, IA
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    The side stacks on my previous truck, Intl 9400i, used a muffler underneath that was in and out the same end. I just took it off, had curved exhaust pipe made up, put on a 10" resonator, and problem solved. Nice "U" shape and good exhaust flow. Haven't seen the Grand Rock setup, but I know that Pitts Power has several high flow muffler with "U" shape pipe setups for direct plug and play on KW, Intl, etc.

    http://www.pittsburghpower.com/index.php?cPath=25_62&osCsid=5935b37010ded2e02a8678b138df87d8
     
    Cowpie1, May 16, 2013
    Cowpie1, May 16, 2013
    #4
  7. May 25, 2013 #5
    bgxpress2006

    bgxpress2006 Light Load Member

    248
    73
    May 25, 2013
    Montreal, Quebec
    0
    Can someone tell me what Drone means, I have an 07 kw with a c15 ACERT AND I also want to remove thst restrictive system and was thinking of doing same thing by simply routing straight into a Y pipe and out side stacks, with a single resinator before the y pipe
     
    bgxpress2006, May 25, 2013
    bgxpress2006, May 25, 2013
    #5
  8. May 25, 2013 #6
    Saddletramp1200

    Saddletramp1200 Road Train Member

    2,111
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    Sep 4, 2011
    Houston Texas,USA
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    A drone is a Y pipe off of a 6 cylinder engine. Mainly for show. 2 stacks look nice. You can tell if one stack fires first. Cali started it first.
     
    Saddletramp1200, May 25, 2013
    Saddletramp1200, May 25, 2013
    #6
  9. May 25, 2013 #7
    Blind Driver

    Blind Driver Road Train Member

    3,081
    1,406
    Aug 7, 2006
    New Albany, IN
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    Huh? :biggrin_2552:

    A drone a very annoying sound that echos through out the truck.
     
    Blind Driver, May 25, 2013
    Blind Driver, May 25, 2013
    #7
    intrepidor and Ruthless Thank this.
  10. May 25, 2013 #8
    bgxpress2006

    bgxpress2006 Light Load Member

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    May 25, 2013
    Montreal, Quebec
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    Thats kinda of what I figured (sound) I just wanted to make sure
     
    bgxpress2006, May 25, 2013
    bgxpress2006, May 25, 2013
    #8
  11. May 25, 2013 #9
    Oscar the KW

    Oscar the KW Going Tarpless

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    May 19, 2011
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    And it typically only occurs at certain RPM's. On my acert it is from 1300-1450 rpm, right smack dab in the middle of my cruising RPM. A drone occurs when the exhaust reaches a certain pitch and resonates or vibrates thru the exhaust, sometimes it can be eliminated by using rubber isolaters between the mounting points of the exhaust and the vehicles frame. I never had a drone with my truck until I got a tune put in the ECM.
     
    Oscar the KW, May 25, 2013
    Oscar the KW, May 25, 2013
    #9
  12. May 25, 2013 #10
    hmtruk

    hmtruk Light Load Member

    123
    49
    Jun 7, 2009
    big lake ,mn
    0
    try running a weed burner . don't like them but will take care of all your problems. know a lot of guys that run 8 to 10 stacks on there 379 and w 900 but run out of a weed burner stack for looks plus when you run exhaust out the bottom stacks stay looking like new.
     
    hmtruk, May 25, 2013
    hmtruk, May 25, 2013
    #10
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