Truckers Report Jobs

Find Trucking Jobs

Company Driver Company Driver Dry Van Dry Van Flatbed Flatbed Refrigerated Refrigerated Specialized Specialized Owner Operator Owner Operator
More Trucking Job Searches ⌄ Fewer Trucking Job Searches
⌃

Grandrock muffler for KW/ IH underbunk type

Discussion in 'Trucks [ Eighteen Wheelers ]' started by 13letter, Dec 10, 2008.

Page 3 of 6
  1. Dec 13, 2008 #21
    13letter

    13letter Light Load Member

    109
    16
    Oct 19, 2008
    Fulton, IL
    0
    Droy, I think that one is the muffler from Pitts Pwr. Same lgth as factory, bout 4'.
     
    13letter, Dec 13, 2008
    13letter, Dec 13, 2008
    #21
    droy Thanks this.
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. Dec 13, 2008 #22
    wallbanger

    wallbanger "Enemy of showers everywhere"

    1,399
    86
    Sep 4, 2006
    In the bougy 'burbs of Detroit, MI
    0
    Droy, is this what you're thinking about?:


    If so, google Diesel injection of Pittsburgh. That is one of their products.

    PS_ Thanks 13letter- you kinda beat me to the punch! ;)
     

    Attached Files:

    wallbanger, Dec 13, 2008
    wallbanger, Dec 13, 2008
    #22
    droy Thanks this.
  4. Dec 13, 2008 #23
    Rock hauler

    Rock hauler Light Load Member

    264
    54
    Nov 26, 2008
    Deridder La.
    0
    Droy, my buddy has the pittsburgh power muffler wallbanger,s showing you and he loves it. it not as loud as straights but you can hear him. it is well built, you can hit it with a hammer if you want to. it's a lot higher cost than GR.
     
    Rock hauler, Dec 13, 2008
    Rock hauler, Dec 13, 2008
    #23
    droy Thanks this.
  5. Dec 13, 2008 #24
    droy

    droy Heavy Load Member

    828
    159
    Jun 11, 2008
    Iowa, LA
    0
    CASE SOLVED!!!!!!!!!!!!!

    Thanks guys, I did have that one in mind, thinking it was the GR!
    I guess I need to lay off of that cheap dope for awhile. lol
     
    droy, Dec 13, 2008
    droy, Dec 13, 2008
    #24
  7. Dec 13, 2008 #25
    Brickman

    Brickman Trucker Forum STAFF Staff Member

    12,905
    12,201
    Sep 17, 2006
    WY
    0



    Other than taming down the harsh sound of straights and still being louder than I liked I saw no performance difference.

    I THOUGHT the mpgs might have come up .1
    That truck didn't have a working pyro so I didn't know about the temp. Better flow should not result in higher temps.
     
    Brickman, Dec 13, 2008
    Brickman, Dec 13, 2008
    #25
  8. Dec 13, 2008 #26
    Brickman

    Brickman Trucker Forum STAFF Staff Member

    12,905
    12,201
    Sep 17, 2006
    WY
    0


    Probably about the same sound as the GR that I used.
     
    Brickman, Dec 13, 2008
    Brickman, Dec 13, 2008
    #26
  9. Dec 14, 2008 #27
    13letter

    13letter Light Load Member

    109
    16
    Oct 19, 2008
    Fulton, IL
    0
    I think I'm going to ditch the GR muffler, put on the ACUP U-pipe to eliminate a muffler altogether. Run it and see how it is. Then maybe fab in a resonator to cut a little noise. Have room for one of those 8" dia ones. Maybe put 2 on it. Also thought about using a Dynomax race muffler. Also 8" dia, 2 differnt lenghts available. Only drop 2-4dbs though. Bout same cost as those resonators with a claim of 3-6dbs. Still want to check real backpressure on this thing. Gotta do some checking into that. Thanks all for your info!
     
    13letter, Dec 14, 2008
    13letter, Dec 14, 2008
    #27
  10. Dec 14, 2008 #28
    MedicineMan

    MedicineMan Road Train Member

    5,799
    6,440
    Jan 13, 2007
    Woodville, TX
    0
    the binder has that 4" exhaust pipe doesn't it? that's always been the restriction in an IH. that muffler is a good unit. ALso the acert cats biggest restriction is the dual smallish turbo's not the mufflers
     
    MedicineMan, Dec 14, 2008
    MedicineMan, Dec 14, 2008
    #28
  11. Dec 14, 2008 #29
    13letter

    13letter Light Load Member

    109
    16
    Oct 19, 2008
    Fulton, IL
    0
    THis one has 4" pipe after the y pipe to the stacks, which are 5". the Y is after the muffler. Would like to change that too. But, right now, this differnce I'm seeing is after putting this different muffler on. I'm going to test backpressure with and without the muffler, and may even put the stocker back on and test that too. Like I posted earlier, maybe on another thread, the internal design of this muffler does not make sense at all. Oh, and this ones not an ACERT. Ole 3406E. Seen on a '04 ISX in a W900 has 4"right off the turbo. Surprising
     
    13letter, Dec 14, 2008
    13letter, Dec 14, 2008
    #29
  12. Dec 20, 2008 #30
    Bigstretch

    Bigstretch Light Load Member

    161
    30
    Jun 14, 2008
    NW IL
    0
    GR has 2 different models of mufflers. One is like the one pic posted earlier. The other is similar to stock.

    If you use the ACUP pipe, you CAN use a regular straight through muffler, as long as the body is no more than 9" in diameter. That is how I used resonators that were straight through.

    Use the u-pipe, resonator or muffler of choice, a length of stack and some clamps. Will fit into the factory mounting brackets. Works best if you had the oval shaped OEM mufflers, vs the round ones.

    I took the resonators off of my truck since I don't run the mountains anymore. Sounds right, now. :D

    A resonator alone sounds like crap on an ISX, unless you run 8" stacks. Then, it sounds closer to a N14. :)
     
    Bigstretch, Dec 20, 2008
    Bigstretch, Dec 20, 2008
    #30
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

    • Page 3 of 6