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Thread: TD5 Exhaust - How Big?

  1. 24th February 2010, 12:03 PM #11
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    disco_thrasher
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    how loud is it with a straight thru system no muffler no resonator is it rediculis or a good rumble
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  2. 24th February 2010, 12:14 PM #12
    Tombie Guest
    Quote Originally Posted by disco_thrasher View Post
    how loud is it with a straight thru system no muffler no resonator is it rediculis or a good rumble
    Just a rumble....
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  3. 24th February 2010, 12:14 PM #13
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    Quote Originally Posted by Redback View Post
    Mike just an inquirey, Phil said he measured the turbo end of the exhaust (standard)and said it was 70mm, I've fitted a 75mm mandel bend to mine, is this OK(worried now) back to the rear axle, it's standard from there on.

    Baz.
    The overall pressure drop across your exhaust won't have changed much if you have only replaced 2/3 of it with 0.25" larger pipe.
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  4. 24th February 2010, 12:19 PM #14
    Tombie Guest
    Quote Originally Posted by Redback View Post
    Mike just an inquirey, Phil said he measured the turbo end of the exhaust (standard)and said it was 70mm, I've fitted a 75mm mandel bend to mine, is this OK(worried now) back to the rear axle, it's standard from there on.

    Baz.
    Should be ok, if you experience constant overboosting under hard throttle - regardless of settings then you may need to look into it...

    But otherwise, just continue as is... Lara has a 3" with Vortex, a little twitchy on overboost if booted hard.... Just needed to be careful.

    The turbo outlet necks down pretty quickly.

    Isuzurover he's 3/8" over turbo outlet and 1/2" over diameter till the diff...
    Then down to 2.5" (stock)
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  5. 24th February 2010, 01:21 PM #15
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    Quote Originally Posted by Tombie2 View Post
    Should be ok, if you experience constant overboosting under hard throttle - regardless of settings then you may need to look into it...

    But otherwise, just continue as is... Lara has a 3" with Vortex, a little twitchy on overboost if booted hard.... Just needed to be careful.

    The turbo outlet necks down pretty quickly.

    Isuzurover he's 3/8" over turbo outlet and 1/2" over diameter till the diff...
    Then down to 2.5" (stock)
    To go from a 2.5" to a 3" exhaust, we are talking about a 30% reduction in gas velocity, and a corresponding reduction in pressure drop (back pressure).

    The TD5 is fitted to 90, 110, 130 and discos. If they all have 2.5" exhausts (of varying lengths), there would probably be a 30% difference in back pressure between a 90 and 130 exhaust (if not more).

    I would be surprised if they are set up so close to the limit that a reduction in DP of that order can overspeed the turbo...
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