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Thread: Recommend me a muffler.

  1. 22nd June 2008, 11:14 AM #1
    Dougal
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    Recommend me a muffler.

    At some stage in the foreseeable future, I'll be putting a new muffler on the rangie.

    Currently it's a 2 1/4" system with a large oval chambered muffler, in and out and offset to different sides.
    There's a flange upstream of the muffer, I'll get everything from this point back replaced with 2.5". I need to keep a 2 1/4" downpipe for now, that may change if I find a way to make a 2.5" fit and not touch anything.

    So what's a good muffler that won't have noise patrol after me but will still flow better than what I've got.
    I have plans for more boost, hence the upgrade.
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  2. 22nd June 2008, 11:35 AM #2
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    rovercare
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    Why keep such little pipe?

    3" Mandrel all the way
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  3. 22nd June 2008, 10:19 PM #3
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    1103.9TDI
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    rovercare Why keep such little pipe?

    3" Mandrel all the way
    ....What he said......and leave out the muffler, mine's straight through, haven't had a problem with noise, in fact I haven't had any problems overall.
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  4. 23rd June 2008, 05:03 PM #4
    Dougal
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    3" would create extra clearance problems, no muffler isn't road-legal.
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  5. 23rd June 2008, 05:14 PM #5
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    rovercare
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    Quote Originally Posted by Dougal View Post
    3" would create extra clearance problems, no muffler isn't road-legal.
    Mine's 3"
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  6. 23rd June 2008, 05:18 PM #6
    Dougal
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    Quote Originally Posted by rovercare View Post
    Mine's 3"
    I have a completely different engine mount and space between that and the AC compressor isn't as big as I'd like it to be.
    No I'm not jealous. Muffler choice has a far bigger impact on backpressure than going from 2.5-3" pipe.
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  7. 23rd June 2008, 05:22 PM #7
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    rovercare
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    Quote Originally Posted by Dougal View Post
    I have a completely different engine mount and space between that and the AC compressor isn't as big as I'd like it to be.
    No I'm not jealous. Muffler choice has a far bigger impact on backpressure than going from 2.5-3" pipe.
    But with the right muffler AND 3" pipe, it would be better, yea?
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  8. 23rd June 2008, 05:33 PM #8
    Dougal
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    Quote Originally Posted by rovercare View Post
    But with the right muffler AND 3" pipe, it would be better, yea?
    No, just noisier.
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  9. 23rd June 2008, 05:59 PM #9
    Dougal
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    Some rough calcs put the difference in pumping power between 2.5 and 3" at about 3kw.

    That's 30psi boost, 3000rpm with EGT's of 750 deg C preturbo and 620 deg C post-turbo.
    Also done at 100% VE, probably only really 70% at that rpm.

    Theoretical engine power in those conditions (BSFC of 250g/kwh and AFR of 22:1) is 235kw.
    I'm only aiming for 2/3 of that so I think I'll be fine with a 2.5. The only current issue is finding a suitable muffler.
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  10. 23rd June 2008, 06:05 PM #10
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    isuzurover
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    IMHO - one of those glass-fibre-filled almost straight through mufflers would be a good option. Hope that makes sense??? They have a perforated pipe which does a slight S as it passes through a glass-fibre packed muffler.

    Not sure what I will fit when I get a new muffler soon, but going 3" if it can possibly squeeze in.
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