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Thread: 6x6 exhaust

  1. #1
    Join Date
    Feb 2014
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    Echuca
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    115

    6x6 exhaust

    Hi all,

    I'm in a position that I can upgrade my exhaust on the 6x6 but I would like some advice on if this is worthwhile and what sizes people have used. I've heard that fitting a 3" exhaust from the turbo dump pipe thing is worthwhile with an increase in power and efficiency. I have put a price request into mechanic in town as they supply mandrel bends etc but they're saying a turbo works on back pressure and by de-restricting the exhaust I will actually loose power.

    Has anyone got any first hand experience with this?

    Cheers, Geoff

  2. #2
    Join Date
    Feb 2005
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    Bracken Ridge - Brisbane - QLD
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    14,356
    The Army Trialed 3 straight through no muffler on the bushranger trials.....along with adjusting the fuel......

    The outcome was a decent improvement....you will need to adjust the fuel screw.

    The two GMVs were returned to OEM spec.

  3. #3
    Join Date
    Jan 1970
    Location
    In my D2a Ripping It Up
    Posts
    10,325
    Quote Originally Posted by Geoff View Post
    Hi all,

    I'm in a position that I can upgrade my exhaust on the 6x6 but I would like some advice on if this is worthwhile and what sizes people have used. I've heard that fitting a 3" exhaust from the turbo dump pipe thing is worthwhile with an increase in power and efficiency. I have put a price request into mechanic in town as they supply mandrel bends etc but they're saying a turbo works on back pressure and by de-restricting the exhaust I will actually loose power.

    Has anyone got any first hand experience with this?

    Cheers, Geoff
    Sorry send your mechanic back to school or find a new one
    As he has NFI !
    cheers chris


    My Toy 04 D2a Td5 Manual With Lots of Goodie Goodness
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  4. #4
    Join Date
    Apr 2011
    Location
    Windsor NSW
    Posts
    212

    ring KLR re Windsor Exhausts

    Possibly ring or contact KLR in Sth Windsor Sydney who tend to specialise in the perenties so they should know what works/what doesn't. They mostly use Windsor Exhausts {in Richmond!) re supply/fitting--have done a lot. I have no connection with KLR but they do know the perenties.

  5. #5
    Join Date
    Jun 2006
    Location
    Hay Point
    Posts
    3,945
    Quote Originally Posted by Geoff View Post
    Hi all,

    I'm in a position that I can upgrade my exhaust on the 6x6 but I would like some advice on if this is worthwhile and what sizes people have used. I've heard that fitting a 3" exhaust from the turbo dump pipe thing is worthwhile with an increase in power and efficiency. I have put a price request into mechanic in town as they supply mandrel bends etc but they're saying a turbo works on back pressure and by de-restricting the exhaust I will actually loose power.

    Has anyone got any first hand experience with this?

    Cheers, Geoff
    Yep, from experience I can tell you that it definitely improves performance. I went 3" from the turbo dump pipe right through and opened the fuel screw 1 turn and it made a fairly good improvement. Brian
    Cheers......Brian
    1985 110 V8 County
    1998 110 Perentie GS Cargo 6X6 ARN 202516 (Brutus)

  6. #6
    Join Date
    Aug 2006
    Location
    Melbourn(ish)
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    24,952
    you go get yourself a 3 inch mandrel bend setup in add an boost gauge an egt and get to know what its doing first. Then drop me a line, I know a guy who'll make that thing sing for ya.

    Same guy will probably also help you swap in 3.54 diffs if you want so you can use the extra power effectively (unless you tow a lot or run extra heavy in which case 4.11 is fine)
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    TDI D1(parting/ed)
    Tdi autoManual d1 (Kept it for the girlfriend)
    Archaeopteryx 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.

  7. #7
    Join Date
    Feb 2014
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    Echuca
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    Awesome, thanks guys. Looks like I'll be ordering a 3" exhaust on Monday 😉

    And the mechanic isn't my mechanic, it's just the only place in town that has a mandrel bender

  8. #8
    Join Date
    Feb 2014
    Location
    Echuca
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    115
    OK, 3" exhaust is finally done. It's a bit backyard but hey, I did it myself without a bender and I'm happy with it. Egt is in as well so I think it's time to start playing with the fuel screw. Silly question though, which one is the fuel screw and which way do I turn it to make it go faster 🤣🤣. I'll be marking it so I can put it back where it was, just want to slowly wind it up till I'm happy with the performance, fuel economy and egt temps

    20190218_111041.jpg20190218_111102.jpg

  9. #9
    Join Date
    Aug 2006
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    Melbourn(ish)
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    24,952
    Quote Originally Posted by Geoff View Post
    OK, 3" exhaust is finally done. It's a bit backyard but hey, I did it myself without a bender and I'm happy with it. Egt is in as well so I think it's time to start playing with the fuel screw. Silly question though, which one is the fuel screw and which way do I turn it to make it go faster 🤣🤣. I'll be marking it so I can put it back where it was, just want to slowly wind it up till I'm happy with the performance, fuel economy and egt temps

    20190218_111041.jpg20190218_111102.jpg
    define faster,

    do you want more top speed or better pulling to the current speed.

    the former I do not reccomend you achieve via messing with the engine but change the tyre size and gearing, the latter.....

    couple of bobs and bits to mess with and the first thing I suggest is grab the EMEI that has the tech descrption of every thing so you know what the pump is doing, it also has the pics of what you need to adjust.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    TDI D1(parting/ed)
    Tdi autoManual d1 (Kept it for the girlfriend)
    Archaeopteryx 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.

  10. #10
    Join Date
    Feb 2014
    Location
    Echuca
    Posts
    115
    Hi Dave, I don't want to go faster tbh, I just want to see if I can get slightly better performance especially pulling up hills on the highway. At the moment even bread trucks and semis are overtaking me 😩😩

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