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WRX exhaust tone

Discussion in '2nd Gen. Tacomas (2005-2015)' started by PMK, Feb 24, 2011.

  1. Feb 24, 2011 at 1:13 PM
    #21
    blackhawke88

    blackhawke88 wo ai ni bao bei ^_^

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    you can do it, just keep one side headers stock, then have the otherside wrap around itself a few times, then connect them to y-pipe....bam! Unequal length headers
     
  2. Feb 24, 2011 at 1:22 PM
    #22
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Nope.

    Engine sound is dertermined (aside from muffler, which just changes the tone) by the timing in which that piston is timed on the crankshaft. Take Harley for example. There are tonnes of V twins on the road, but only Harley has its sound.
    Some vehicles are evenly timed, others are staggered in a way to give a certain sound...
     
  3. Feb 24, 2011 at 1:25 PM
    #23
    blackhawke88

    blackhawke88 wo ai ni bao bei ^_^

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    then how do you explain the exhaust note completely changing when a subie gets equal length headers, ceteris paribus?
     
  4. Feb 24, 2011 at 1:27 PM
    #24
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Ive never heard of anything like that. The exhaust length doesnt affect the timming of the pistons, or fireing sequence. It may change the tone, but the sound pulles will be the same.
     
  5. Feb 24, 2011 at 1:27 PM
    #25
    xodeuce

    xodeuce mmmmmmbourbon.

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    Chris FTW.

    Another excellent example of this is Yamaha's new firing order and timing in their inline 4 cylinder liter bike. They changed the cylinder firing order, ignition, and valve timing. The displacement didn't change appreciably, nor did the cylinder configuration, or really the exhaust setup. However, it sounds like a totally different motorcycle. The cam's lift and duration has a fairly significant effect on an engine's exhaust note as well.
     
  6. Feb 24, 2011 at 1:29 PM
    #26
    PMK

    PMK [OP] Well-Known Member

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    The WRX being flat should the crank journals 180° spaced (paired) or 90° (individual). I'm not sure which since I never owned or worked on a WRX.

    Guessing the 4.0 liter Tacoma is 60°, but again don't know.

    PK
     
  7. Feb 24, 2011 at 1:31 PM
    #27
    blackhawke88

    blackhawke88 wo ai ni bao bei ^_^

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    this link:
    http://www.doudna.com/Subaru/

    does cover what Chris said about timing, however, at the end it says if you have independent headers for each cylinder run equally together into the exhaust, it will sound like a regular inline four, hence, how equal length headers will change the sound of the engine
     
  8. Feb 24, 2011 at 1:31 PM
    #28
    MountainEarth

    MountainEarth Well-Known Member

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  9. Feb 24, 2011 at 1:32 PM
    #29
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    They can be whatever the manufacture wants them to be set at.
     
  10. Feb 24, 2011 at 1:35 PM
    #30
    PMK

    PMK [OP] Well-Known Member

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    I agree, the exhaust timing and lift can make the tone change.

    If they are still running a similar exhaust, which is stated, if it's a four into one then I doubt the tone would change much. Probably the exhaust timinig.

    Haven't looked at the bike, but does it have some type of EXUP or function changing the exhaust effective length.

    Also, being fuel injected, it seems now they are really playing with the ECU ignition portion, the fuel injection program and getting the bikes to work very well with none of the old carb issues.

    PK
     
  11. Feb 24, 2011 at 1:36 PM
    #31
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    They dont necessarilly change the sound, nor make them sound like an I4. Infact, doing so could have adverse performance impact on the engine. In the same link, This guy give some more detail:

     
  12. Feb 24, 2011 at 1:40 PM
    #32
    blackhawke88

    blackhawke88 wo ai ni bao bei ^_^

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    http://www.youtube.com/watch?v=HoXkm8i-S4I
     
  13. Feb 24, 2011 at 1:42 PM
    #33
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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  14. Feb 24, 2011 at 1:47 PM
    #34
    unentered

    unentered Son of Baconator

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    What Volkswagen has a horizontally opposed boxer 4?
     
  15. Feb 24, 2011 at 1:51 PM
    #35
    06rubi

    06rubi Well-Known Member

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    I say if you want a WRX sound, get a WRX! Here is my STi next to my wifes Tacoma.
    [​IMG]
     
  16. Feb 24, 2011 at 2:27 PM
    #36
    Blacktacoma23

    Blacktacoma23 CO

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    Now I kinda miss my STI :(
     
  17. Feb 24, 2011 at 2:29 PM
    #37
    KPT

    KPT sees what you did there.

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    Me too....:(

    [​IMG]
     
  18. Feb 24, 2011 at 2:37 PM
    #38
    Blacktacoma23

    Blacktacoma23 CO

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    Mine:

    [​IMG]
     
  19. Feb 24, 2011 at 2:40 PM
    #39
    blackhawke88

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  20. Feb 24, 2011 at 2:40 PM
    #40
    joerussell610

    joerussell610 When all else fails read the directions

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