Exhaust modification

Discussion in 'Car Modification' started by Izso, Jul 3, 2018.

  1. Izso

    Izso Boooooossst
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    Guys,

    I have a 3" straight flow exhaust setup on my turbo car. I have a mid-box resonator (pretty large one and is straight flow) and a pretty large straight flow rear muffler. But it's still loud and the droning at 2.6-3k rpm is killing me since I'm in that rev range a lot.

    I've been reading up about side-branch resonators and helmholtz resonators. It's those weird branch exhaust add-ons that apparently take away the droning by cancelling out certain frequencies depending on length of the resonator.

    Anyone tried this with positive results?

    images.jpg images2.jpg
     
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  2. stupidcar

    stupidcar 5 Year | Silver

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    I have seen Adam LZ doing this on his 350z, dual. Useless. Apparently well known brand still.
     
  3. ^pomen_GTR^

    ^pomen_GTR^ Senior Member
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    my suggestion is better and cheaper to go with dual resonator instead...


    this frequency tune especially exhaust require a lot of trial and error...
     
  4. Izso

    Izso Boooooossst
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    Well known brand? Didn't know there's branded resonators out there. It didn't help to reduce the drone for Adam LZ? I'll go google this.


    Well, if I can't fit another reso then I won't really have much of a choice. Trial and error is scary
     
  5. vr2turbo

    vr2turbo 5 Year | Silver
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    That is the reason, I don't use my VR for outstation. The droning is really bad........lol
     
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  6. mag9556

    mag9556 Senior Member
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    change back to ori setup with bigger inch pipe not more than 2.5 inch, it will be smooth and nice sound like feel nothing..:biggrin:
     
  7. Izso

    Izso Boooooossst
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    I'd have to change a lot of things if I did that. Including the downpipe, manifold, turbo housing... not gonna happen
     
  8. vr2turbo

    vr2turbo 5 Year | Silver
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    What about the resonator box you have been asking the rest to try out, will that unit help?
     
  9. Izso

    Izso Boooooossst
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    no cuz I need 3".. that's 2" only.
     
  10. vr2turbo

    vr2turbo 5 Year | Silver
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    So getting a box with that size also less? Never touch exhaust for a long time already. My VR one stainless steel since transplant......lol
     
  11. Izso

    Izso Boooooossst
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    Not less, just not a lot of demand so not a lot of people sell
     
  12. vr2turbo

    vr2turbo 5 Year | Silver
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    That is always the problem, like rare cars, less parts. Non common tyre size also difficult to find.....
     
  13. ^pomen_GTR^

    ^pomen_GTR^ Senior Member
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    i got a suggestion... find a place where lorry/busses do their exhaust... those kind of shop can custom muffler?resonator according to your size...small or big also can...

    coz 3" is common for lorry and busses...


    downside is probably come in normal mild steel...no SS material..
     
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  14. vr2turbo

    vr2turbo 5 Year | Silver
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    But his car not so mush space like lorries and buses.....hhahahhahha
     
  15. Izso

    Izso Boooooossst
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    Let's see how it goes. Until I get the car back I won't know how best to proceed.
     
  16. vr2turbo

    vr2turbo 5 Year | Silver
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    We got a MIG welder and DIY......hhahhahahhahaha
     
  17. Izso

    Izso Boooooossst
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    who has the welder?
     
  18. vr2turbo

    vr2turbo 5 Year | Silver
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    Sorry, wrong tense. Should be we "get"...lol
    I only know Joe has but that is in his work place.....lol
     
  19. WilsonTHarv

    WilsonTHarv New Member

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    I have seen a video on youtube about installing helmholtz resonator on a galant vr4 to reduce drone ... he get a quite positive result with it ,maybe you could check it out if u haven't watched it .
     
  20. ixeo

    ixeo Senior Member
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    if I had to guess, from my own experience it’s because the diameter of the pipe is on the big side thus it drones.
     

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