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Thread: Removing centre muffler

  1. 21st October 2012, 08:44 AM #1
    460cixy's Avatar
    460cixy
    460cixy is offline YarnMaster
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    Removing centre muffler

    I'm thinking about ****ing off the centre muffler on my 300tdi it's got the usual pump mods and goes well how much of a diffrance does takeing out the muffler make ie performance egt and noise ? Is it worth it. Not hat it's a expensive mod
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  2. 21st October 2012, 11:25 AM #2
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    Reads90
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    When I put a Long range tank in the 90 I had to take out the back box. Made it sound more throaty but also seem to give it a bit more mid range grunt.
    95 300 Tdi Defender 90
    99 300 Tdi Defender 110
    92 Discovery 200tdi
    50 Series 1 80
    50 Series 1 80

    www.reads4x4.com
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  3. 21st October 2012, 01:10 PM #3
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    rick130
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    Everyone says it makes a difference but I reckon it's a placebo effect (if it's louder it's faster, right ?)

    Why don't I think it does anything ?

    It's a straight through, perforated tube, glass pack muffler.

    If you drop the dump pipe off the turbo it has a huge mig bead all the way around the inside, (seemingly) restricting flow.

    I ground that out so it was all nice and smooth and couldn't measure a difference on my test hills either (all prior to upping the fueling)

    A 2.5", 2.75" or 3" pipe does make a (small) difference, and you'll see slightly lower EGT's by around 20-25* peak.

    The 3" pipe definitely allowed a greater rev range through the gears on the 130. 3rd went from peaking at around 75km/h to easily passing 90km/h and still accelerating uphill, so the reduction in backpressure makes a fair old difference at high revs.
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  4. 21st October 2012, 01:55 PM #4
    dromader driver
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    Thumbs up done that

    my original 1994 centre muffler developed a fatigue crack so did a cut and shut with a hotdog. $120.00 fitted and welded. With hindsight would just put in a straight length of pipe and leave the hotdog out.

    Can't tell the difference on noise but my calibrated hill test track results indicate it will hold a gear longer and definitely nicer to drive. Floor still gets pretty hot though. Will eventually do something about that making a heat shield or similar.
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