Thread: Exhaust Note/ Proposition

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  1. #1 Exhaust Note/ Proposition 
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    Hello all. I'm new here, so bear with me. I have a proposition. I'm on a mission to make the 3800's exhaust note sound nice. I've found a video with a Holden Commodore VT (V6, 3.8L), and the car has straight pipe duals. I've been searching as much as possible to find out why it sounds so amazing compared to the 3.8's over here.. I was thinking the headers could be a factor to this, but it could also be the drivetrain difference. I have taken note that the headers are different on the Commodore. They are seperate.
    This is just a wild theory, but could that have anything to do with the difference of sound? I've also found a video with a Commodore straightpipe exhaust note. I'm no expert, so go ahead and give me an in depth explanation of why this is.

    Here's the video: https://youtu.be/JmnoXNJjiSs
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  2. #2 Re: Exhaust Note/ Proposition 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Make the exhaust seperate for each bank and it will sound good, that is about the only way.

    A recent member here created his own true dual exhaust setup on his grand prix and it sounds good for a 3800. Custom crossover to downpipe and custom "cat-back" out the side of the car.



    http://www.grandprixforums.net/threa...e+dual+exhaust

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  3. #3 Re: Exhaust Note/ Proposition 
    I break things. WarStryker13's Avatar
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    ^^^^^ that's a very good example

    I want to do something similar eventually, I would love to hear that with a big cam... Lol

    04 GP GT2: Handling upgrades, go-slow parts, and an attitude. Totaled.
    87 Dodge Ram 50:​ Junkyard rescue, resurrection in progress.
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  4. #4 Re: Exhaust Note/ Proposition 
    I can't car too good. SaukRapids's Avatar
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    GIYF ~ "3800 true duals"

    The white GTP that comes up sounds like total ass, imho. https://www.youtube.com/watch?v=ctoJw8Qy-NE

    A few forum threads came up so there's probably been others try different pipe diameter, muffler, etc.
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  5. #5 Re: Exhaust Note/ Proposition 
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    Quote Originally Posted by SaukRapids View Post
    GIYF ~ "3800 true duals"

    The white GTP that comes up sounds like total ass, imho. https://www.youtube.com/watch?v=ctoJw8Qy-NE

    A few forum threads came up so there's probably been others try different pipe diameter, muffler, etc.
    That thing sounds horrible.


    Just put a cam with a 3 inch exhaust setup. It'll sound ok, not great but ok. Best you can get with a gp.

    If you want better buy a gxp or another v8 car. You'll waste time, effort and more importantly money trying to reinvent the wheel to make a fwd 3800 sound great.
    Comp G. E85, 2.8, Headers, Tune, Intake, S1X, 105# springs, 60 # injectors, 255 walbro,etc.

    *NEW* 2002 Camaro Z28- Lid, Headers, Catback

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  6. #6 Re: Exhaust Note/ Proposition 
    I can't car too good. SaukRapids's Avatar
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    Quote Originally Posted by MONSTROSITY505 View Post
    I have taken note that the headers are different on the Commodore. They are seperate. I'm no expert, so go ahead and give me an in depth explanation of why this is.

    Here's the video: https://youtu.be/JmnoXNJjiSs
    It helps if I remember that air is a fluid to understand exhaust. Each time a cylinder fires, a pulse travels down the exhaust. Separating the "pulses" is good for flow on any engine, right? V8, V6, V12..doesn't matter. The problem with a 3800's "sound" is that it's created by the bore, stroke and timing of the architecture. Also very simply, you can think of it as running two separate inline 3 cylinder 4 strokes next to each other. Do you think that could ever sound good?

    I'm with chrsmi1.

    Oh, and that video? That could be anything. I mean, you can't see the engine. Just have to take their word that it's what they say it is. Not everyone with a camera's honest.
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  7. #7 Re: Exhaust Note/ Proposition 
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    I've been getting some feedback from other people and so far the only way to make it sound "nice" (IMO) is to make true duals. The problem I'm hearing is the clearence issue. And apparently the turbo setup would be the only way to get for the sound I'm trying to emulate. The thing I dont understand is, isn't it possible to just get the connected headers, and divide the connection into two while at the same time keeping the tubes right next to each other? Just look at ZZP's headers for example. What if you could cut into it, and just have someone add a middle piece. Would that still count for true duals?
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  8. #8 Re: Exhaust Note/ Proposition 
    I break things. WarStryker13's Avatar
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    I think if you ran a single exhaust from a semi-turbo style crossover, just use PLOGs for the front and rear, that would make the "headers" equal length and give you a better sound... It's not "true" duals, but it will sound like a turbo exhaust without the turbo noises.

    Or you could build a custom "crossover", maybe a Y pipe that exits towards the driver's side and runs the same route as the turbo downpipe...

    Anything that would resemble a true dual exhaust will have to be custom fabricated.

    04 GP GT2: Handling upgrades, go-slow parts, and an attitude. Totaled.
    87 Dodge Ram 50:​ Junkyard rescue, resurrection in progress.
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  9. #9 Re: Exhaust Note/ Proposition 
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    they best way to get a 3800 to sound decent is to remove the screwy things from the intake of the engine and install a whirlly thing on the exhaust
    - 2001 Grand Prix XGT -- 11.21@124MPH
    - 2010 Chevy 2500HD LTZ -- Car hauler
    - 2011 BMW 328i Xdrive -- Wife's Daily
    - 2014 Ford F250 crew cab -- 6.2 liters of ford fail
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  10. #10 Re: Exhaust Note/ Proposition 
    I break things. WarStryker13's Avatar
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    They aren't screwy things unless you are really lucky... They're more like triangles.

    04 GP GT2: Handling upgrades, go-slow parts, and an attitude. Totaled.
    87 Dodge Ram 50:​ Junkyard rescue, resurrection in progress.
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  11. #11 Re: Exhaust Note/ Proposition 
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    ok...sprial fluted triangly thingys...
    - 2001 Grand Prix XGT -- 11.21@124MPH
    - 2010 Chevy 2500HD LTZ -- Car hauler
    - 2011 BMW 328i Xdrive -- Wife's Daily
    - 2014 Ford F250 crew cab -- 6.2 liters of ford fail
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  12. #12 Re: Exhaust Note/ Proposition 
    I break things. WarStryker13's Avatar
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    Lol I was looking at a RWD conversion somebody did on here a while ago, that's really the only way to get true duals in a GP. lol

    04 GP GT2: Handling upgrades, go-slow parts, and an attitude. Totaled.
    87 Dodge Ram 50:​ Junkyard rescue, resurrection in progress.
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  13. #13 Re: Exhaust Note/ Proposition 
    Donating Users Bronco Boy's Avatar
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    Anybody ever messed with a side-resonator style exhaust? I've read a lot of good things about them on 350z's.

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  14. #14 Re: Exhaust Note/ Proposition 
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    Huh... I have no idea how that would sound on a 3800.

    04 GP GT2: Handling upgrades, go-slow parts, and an attitude. Totaled.
    87 Dodge Ram 50:​ Junkyard rescue, resurrection in progress.
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  15. #15 Re: Exhaust Note/ Proposition 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    J-pipes or helmholtz resonator is another name for them, those might help too with rasp and overall sound from the exhaust.

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  16. #16 Re: Exhaust Note/ Proposition 
    Donating Users Bronco Boy's Avatar
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    Quote Originally Posted by WarStryker13 View Post
    Huh... I have no idea how that would sound on a 3800.
    Quote Originally Posted by Fivefingerdeathpunch View Post
    J-pipes or helmholtz resonator is another name for them, those might help too with rasp and overall sound from the exhaust.
    Somebody should try it and see. I'm curious how it would sound.
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  17. #17 Re: Exhaust Note/ Proposition 
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    Quote Originally Posted by SaukRapids View Post
    It helps if I remember that air is a fluid to understand exhaust. Each time a cylinder fires, a pulse travels down the exhaust. Separating the "pulses" is good for flow on any engine, right? V8, V6, V12..doesn't matter. The problem with a 3800's "sound" is that it's created by the bore, stroke and timing of the architecture. Also very simply, you can think of it as running two separate inline 3 cylinder 4 strokes next to each other. Do you think that could ever sound good?
    I am also interested in getting an L67 to sound good (but in a RWD). I think that Porsche flat 6's sound nice - so I wonder how much of the difference is between the flat6/v6, how much is flow, how much is cam, how much is exhaust design, etc? And maybe it's just the difference in how much engineering effort was put into getting a good sound. I would think Porsche spent time on this and GM... maybe not so much.
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  18. #18 Re: Exhaust Note/ Proposition 
    I can't car too good. SaukRapids's Avatar
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    I like the J-pipe idea. I kinda wanna look and see how it works now, lol.

    I'll try and be brief with my uneducated (I'm not a hydro-dynamics major) perspective.

    I agree that the difference when I specifically think of another 3.8 exhaust compared to a 3800 is interesting. The higher profile engines that come to mind are newer Porches and the Nissan GT-R. All three have different bore and stroke, but more importantly, different valve trains. As you mention, lift, duration, valve size, number of valves, spring rate, and even seat angle will affect what air comes out. What air goes in, or is forced in (temp, pressure, volume) will affect the ..uhm "power"? of the pulse going down the pipe.

    Interestingly, I think a J pipe tries to alleviate rasp by giving overlapping gasses a place to go. See, I think the root cause of rasp or rap (in my experience with pickups) is exhaust flow running into itself very near the engine, causing air and hence sound to bounce around inside the exhaust (maybe even air "slapping" against itself and/or the valves opening and closing). Does that make any sense?

    I guess the Porche would have the shortest exhaust route, giving it a unique sound. Feel free about your perspective. This is just from my limited understanding.
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  19. #19 Re: Exhaust Note/ Proposition 
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    I think it's the fact that the 3800 was derived from a V8 originally, so it's "missing" two pistons. That's where the 3800's good sounding exhaust note went. Lol

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  20. #20 Re: Exhaust Note/ Proposition 
    I live here. stealthee's Avatar
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    The 3800 was not derived from a V8. You are thinking of the Chevy 3.8 (229 ci). We have a Buick 3.8 (231 ci)


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