Thread: Bypass exhaust screamer valves

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  1. #1
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    Default Bypass exhaust screamer valves

    I was thinking lately for experimenting a little around on the exhaust system of my Gen4 SRT.

    I got an idea on this vid on youtube
    YouTube - Dodge Viper SRT 10 exhaust sound (MUST hear!!!)



    I could see on that video that that bypass system would not free the resonators and the catalytic converters.

    What came up is to use some cheap wastegates off Ebay (for around $100 each) with 2-1/2" openning, and place them somewhere before the cats.
    Apart from the noise, I suppose that will make some power improvement in combination with the Mopar PCM.


    Here is the wastegate.




    Here is the elbow pipe that I had to weld and cut an etension for reaching the correct length.




    Here is also how it is planned to be welded




    Another picture also of the planning with the wastegate.



    As about the control of the wastegate valve, I am thinking of stealing some vacuum off the power brake booster tank and make the management when in WOT and at some certain RPMs.

    I will keep updated for anything new that will come up.

    I am open to comments and any advices.


    George

  2. #2
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    Default Re: Bypass exhaust screamer valves

    Why don't you just buy premade exhaust cut outs rather than reinventing the wheel?

    JEGS High Performance - 555-30831
    Last edited by Black Moon; 12-15-2010 at 06:57 PM.

  3. #3
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    Default Re: Bypass exhaust screamer valves

    Not sure if I would cut my cat up, those things are not cheap. Where are you going to run the hot
    exhaust? Out the bottom right by the foot well?

    Herc

  4. #4
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    Default Re: Bypass exhaust screamer valves

    Quote Originally Posted by Black Moon View Post
    on't you just premade wxhaust cut outs rather than reinventong the wheel?

    JEGS High Performance - 555-30831
    Damn Sal! Been drinking a little? lol

  5. #5
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    Default Re: Bypass exhaust screamer valves

    Honestly, I think mine sounds better and louder than the one in the video.

  6. #6
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    Default Re: Bypass exhaust screamer valves

    Pain pills not alcohol. Plus i've been hanging with Tweester!!!!

  7. #7
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    Default Re: Bypass exhaust screamer valves

    Fixed it for you. That's what I get for spilling Mt Dew on keyboard (again)!!!!!
    Last edited by Black Moon; 12-15-2010 at 07:03 PM.

  8. #8
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    Default Re: Bypass exhaust screamer valves

    I think it would be cool to see flames coming out the side pipes at WOT

  9. #9
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    Default Re: Bypass exhaust screamer valves

    That ain't gonna happen under normal circumstances. If it does you had better check your tune because it's running way too rich.

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    Default Re: Bypass exhaust screamer valves

    one of the most retarded things ive seen on this site.

    throw in the tornado air filter thingy and you have quite the ricer. if this was the alley, id have a few more ideas and bits of advice for ya......

  11. #11
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    Default Re: Bypass exhaust screamer valves

    I've heard what a stock Viper sounds like without any exhaust attached at the headers which is basically what you are doing and it sounds like crap. Not to mention it is deafeningly loud. You wont last 5 mins driving around like that. The first time you hit the gas your ear drums will blow out and everyone within a 10 mile radius will think a tractor just exploded.

  12. #12
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    Default Re: Bypass exhaust screamer valves

    I actually thought it sounded pretty damn mean when I cranked it up with open headers. WAY too loud though (and I like loud). You would be deaf and pulled over every time you passed a cop for noise pollution.

  13. #13
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    Default Re: Bypass exhaust screamer valves

    Quote Originally Posted by plumcrazy View Post
    throw in the tornado air filter thingy and you have quite the ricer. ......

  14. #14
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    Default Re: Bypass exhaust screamer valves

    here is the best sounding SRT in my opinion.

    [media]http://www.youtube.com/watch?v=KUNrTV9y5I0[/media]

  15. #15
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    Default Re: Bypass exhaust screamer valves

    Looks like it's going to be a long winter

  16. #16
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    Default Re: Bypass exhaust screamer valves

    probably sounds different because your bypass valves have a smaller id than a 2.5" cutout

  17. #17
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    Default Re: Bypass exhaust screamer valves

    Quote Originally Posted by Black Moon View Post
    Why don't you just buy premade exhaust cut outs rather than reinventing the wheel?

    JEGS High Performance - 555-30831

    Those electric cutouts I have read that they do not last working for a long time, because the heat easily melts the insulation within the motor that makes the movement of the butterfly.


    Secondly, they are quite slow to open and close instantly.


    And last, the butterfly cutout compared to the wastegate valves, does not close completely, and especially after extended use.
    Last edited by tzortzViper; 12-16-2010 at 01:40 AM.

  18. #18
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    Default Re: Bypass exhaust screamer valves

    Quote Originally Posted by ILLSMOQ View Post
    probably sounds different because your bypass valves have a smaller id than a 2.5" cutout
    Right, inlet is 2.5" but the outlet is 1-3/4".

    Also, the exhausts gases will go out down exactly under the cats. There is a big openning.

    Those cats are out of a wrecked Gen3, so if I dont like it I can change it back easily.


    .
    Last edited by tzortzViper; 12-16-2010 at 01:43 AM.

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    Default Re: Bypass exhaust screamer valves

    Quote Originally Posted by plumcrazy View Post
    one of the most retarded things ive seen on this site.

    throw in the tornado air filter thingy and you have quite the ricer. if this was the alley, id have a few more ideas and bits of advice for ya......

    Can you please be specific, why you call it "retarded"?




    .

  20. #20
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    Default Re: Bypass exhaust screamer valves

    no, thats all you get.

  21. #21
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    Default Re: Bypass exhaust screamer valves

    Quote Originally Posted by plumcrazy View Post
    no, thats all you get.
    Better dont post if you cannot support it.


    ps. 12,913 BS




    .

  22. #22
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    Default Re: Bypass exhaust screamer valves

    I shouldn't need to. i think its obvious.

    PS: Shuush

  23. #23
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    Default Re: Bypass exhaust screamer valves

    Quote Originally Posted by plumcrazy View Post
    I shouldn't need to. i think its obvious.

    PS: Shuush
    It is obvious to a smart-guy like you. Please explain to us, the "retarded".

    ps. 12,914 BS (and keep going)





    .

  24. #24
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    Default Re: Bypass exhaust screamer valves

    nope...........

  25. #25
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    Default Re: Bypass exhaust screamer valves

    fine banter

  26. #26
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    Default Re: Bypass exhaust screamer valves

    this is one of those scenarios where "less is more"
    Quote Originally Posted by eucharistos View Post
    fine banter

  27. #27
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    Default Re: Bypass exhaust screamer valves

    I am just too curious to see what hp increase can be achieved, in combination with the Mopar PCM, with such a mod.

    I could not find anywhere any dyno results of before and after cat-resonator-exhaust removal.

    Maybe because nobody could stay in the dynoshop with such a noisiness!?






    .

  28. #28
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    Default Re: Bypass exhaust screamer valves

    Quote Originally Posted by plumcrazy View Post
    here is the best sounding SRT in my opinion.

    [media]http://www.youtube.com/watch?v=KUNrTV9y5I0[/media]




    Thanks Phil. After I passed Gary who was filming I had to come off the throttle quickly at the end of the video. I had some bird watchers running out of the woods flapping their arms and screaming that I made some red swallow birdies fly away

  29. #29
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    Default Re: Bypass exhaust screamer valves

    1. You cant cut that cat there. Try and and you will see why, lol

    2. You wont gain a thing.

    3. How are you planning on opening that wastegate? Wastegates require HIGH exhaust back pressures to open them, something you don't have. You also have zero manifold vacuum at WOT to use to pull it open.

  30. #30
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    Default Re: Bypass exhaust screamer valves

    Please don't cloud this thread with facts.....

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