Adjustable exhaust noise type thing??

Thread in 'Technical Questions' started by NIcad7, Oct 10, 2010.

  1. NIcad7

    NIcad7 DRIFT*DIVISION

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    Anyone got any links or clues as to how I can run my exhaust quiet for on the roads and silly loud on the track?

    Im running a bung at the moment, but want adjustability and in car control of some kind.

    Any ideas? :confused:
     
  2. Rickybobby

    Rickybobby Member

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  3. NIcad7

    NIcad7 DRIFT*DIVISION

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    Yeh something like that, although not too sure how much of a negative effect that would have with serious back pressure.

    I think ive found what I need though, just expensive;

    [ame=http://www.youtube.com/watch?v=K7jGYnhbQQU&feature=player_embedded]YouTube - Varex remote control muffler.[/ame]
     
  4. Ted

    Ted DRIFT*DIVISION

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    Thats an awesome piece of kit! LIke you say though, no doubt an arm and a leg!
     
  5. PhilMorrison

    PhilMorrison WholeLifeCrisis
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    That's a really cool system. I've had a butterfly valve in the exhaust before, and it did reduce volume, however it also massivly reduced power to a worrying level, so that diverted exhaust flow system is a really cool answer to the problem.
     
  6. Ted

    Ted DRIFT*DIVISION

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    Get them in the shop!
     
  7. bluejohndeere

    bluejohndeere Member

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    on an old car i had,i fitted a y piece to the exhaust before the silencer with a throttle body on the end, then it was operated by a cable into the car. so you just pull the handle and get lots of noise. only downside was it didnt seal 100%.
     
  8. topi

    topi KlutchKickKidz

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    Ear plugs are cheap.
     
  9. Dex

    Dex kut!

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    "guerilla exhaust systems"
    they do them here in holland, basicly you run 2 pipes with a valve to switch between pipes.


    or get an apexi valve.
     
  10. Mr Bizzle

    Mr Bizzle In Safe Hands

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    Varex is 313.10 delivered to my door...
    Not bad at all.

    Just about to order one for the FD, so ill let you know how i get on.
     
  11. NIcad7

    NIcad7 DRIFT*DIVISION

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    Sweet when im flush again - ha! I think ill get one :nod:
     
  12. caged

    caged Drift Gibbon

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    looks heavy no?
     
  13. Dex

    Dex kut!

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    you not coming to germany anytime soon? you can test my apexi valve if you like?
     
  14. Jamie-PS13

    Jamie-PS13 Active Member

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    I have a dyno sheet somewhere of an S14 running one of these and then without. It caused massive back pressure even at its most open point.
     
  15. Mr Bizzle

    Mr Bizzle In Safe Hands

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    I don't see how that's possible. Once open it's hardly any restriction at all.
    Closed, yep sure - I can see it causing some significat back pressure.

    But in reality, I dont want to go racing with the valve closed. Just pootling around town off boost when thr bacon is about and in/out of my driveway.

    The one I am ordering is a 3" in with a 4.5" tip. I can't see the valve restricting it too much when open
     
  16. DetroitDrift

    DetroitDrift Member

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    actually if you were worried about every little performance gains,,, then even with it fully open it would cause massive back pressure,,, as any sharp edges in the path of an intake or exhaust flow causes a venturi effect which leads to high turbulence. i have done extensive research on this on a flow bench. but since this is not F1 you should be ok as your daily driver because im sure even like this it flows way better then your stock system
     
  17. NIcad7

    NIcad7 DRIFT*DIVISION

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    Nah man I'm finally finished in Germany. Back in the UK full time now :D

    Is the Apexi valve ok then? I just think it will do the same thing as my bung and just cause massive back up, not actually allowing the gases to go anywhere :confused:

    Aparently it weighs 9Kg, so yeh pretty heavy!



    Also when I come to buy it i'm going to try and order it without that gimmicky key fob thing, or the control box, just wire it up to a switch - OR a volume control knob in the car :D :smokin:
     
    #17 NIcad7, Oct 12, 2010
    Last edited: Oct 12, 2010
  18. NIcad7

    NIcad7 DRIFT*DIVISION

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    What if you were to polish and flow the butterfly a little?
     
  19. croustibat

    croustibat Member

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    A bung is shit and produce massive backpressure, it just is stupid to fit this in a 3" exhaust; it restricts the flow MORE than an OEM exhaust.

    Apexi ECV is nice, although it has the same problem : closed even partially means you should just drive around and never floor the pedal. But it gets much quieter. A friend of mine is using it (was in fact, the backbox exploded recently so he made some other mods and it is not currently working. Not ECV related as the ECV fits between decat and catback), quite easy and ear friendly with it quite closed, and LOUD when open.
     
  20. Dex

    Dex kut!

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    the apexi does that indeed. but cruising the highway do you need alot of power?
     

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