Compound Turbo!! Running. NEED HELP!! - Page 2
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This is a discussion on Compound Turbo!! Running. NEED HELP!! within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; This argument has been waged for years, but in the end "TWIN" means identical. Audi has simply succumbed to the ...

  1. #16
    zax
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    This argument has been waged for years, but in the end "TWIN" means identical.

    Audi has simply succumbed to the informal definition.

    I simply refer to all arrangements as "Bi turbo," since that's precisely what they are.

    Your options with Bi-turbo are:
    1. Sequential
    2. Parallel
    3. Staged
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  3. #17
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    Quote Originally Posted by zax View Post
    This argument has been waged for years, but in the end "TWIN" means identical.

    Audi has simply succumbed to the informal definition.

    I simply refer to all arrangements as "Bi turbo," since that's precisely what they are.

    Your options with Bi-turbo are:
    1. Sequential
    2. Parallel
    3. Staged
    Ok I was going to say the same thing, It seems they throw around both terms (biturbo and twin turbo) as if they are the same thing. Which to my knowledge they are not. I understand what you mean and i respect your knowledge, as i am new to the boost world.. Im not trying to argue, just trying to gain my own knowledge on the subject

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    but i do understand that when i explained it i had it backwards, idk how. i know what you mean though. it only makes sense, twins are the same. Bi just means 2 (turbos in our case but by definition thats what they mean. i just mixed up the terms somehow, i wonder what happened to the O.P......
    Last edited by kdeitrich; 10-08-2013 at 07:25 PM.

  5. #19
    Luke Skywalker Mikie13's Avatar
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    Audi probably uses "bi-turbo" because they are European.
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  6. #20
    Registered User gregroot198521's Avatar
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    Quote Originally Posted by zax View Post
    This is a sequential bi-turbo arrangement. Same idea that was common in the 1990s (i.e. RX-7 turbo, Supra, etc.). Modern bi-turbo arrangements are generally parallel (300zx, 335i. etc.).
    Looks more like a 2 stage bi-turbo setup to me, or am I not seeing something fundamental here? Here's some nice diagrams that make me think this: LINK.

    Quote Originally Posted by Mikie13 View Post
    Audi probably uses "bi-turbo" because they are European.
    Lol, punny.
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  7. #21
    ¯\_(ツ)_/¯ Rambo's Avatar
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    I'm trying to figure out the hot side piping, but the one view you show looks like both turbos are tied together, and then there's an EWG? Do you have a diagram of what you're trying to do?

    Also, it seems odd to me to have your high-CFM turbo feeding into a relatively restrictive TD04 turbo. Logic would dictate that the TD04 would be better suited as a booster for the T3, helping it spool faster, then leaving a wide-diameter, fairly unrestrictive path from the T3 through the I/C and back up to the manifold. Of course, compressor maps would confirm or deny this conjecture.

    Any way you slice it, though, that's going to be tricky to tune, especially since it would appear you have the hot sides directly linked, with no independent control of one or the other.

    Best of luck, it's certainly an unusual build!
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  8. #22
    zax
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    Quote Originally Posted by gregroot198521 View Post
    Looks more like a 2 stage bi-turbo setup to me, or am I not seeing something fundamental here? Here's some nice diagrams that make me think this: LINK.
    Yeah I think you may be right. Something is strange when I look back on this.

    Looks like the EWG is intended to allow gases to flow into the second turbine. However, since the second turbine is much larger, I wouldn't expect the pressure to build behind the second turbine with an easy outlet like the hard exhaust piping.
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  9. #23
    Registered User gregroot198521's Avatar
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    Quote Originally Posted by Rambo View Post
    I'm trying to figure out the hot side piping, but the one view you show looks like both turbos are tied together, and then there's an EWG? Do you have a diagram of what you're trying to do?

    Also, it seems odd to me to have your high-CFM turbo feeding into a relatively restrictive TD04 turbo. Logic would dictate that the TD04 would be better suited as a booster for the T3, helping it spool faster, then leaving a wide-diameter, fairly unrestrictive path from the T3 through the I/C and back up to the manifold. Of course, compressor maps would confirm or deny this conjecture.

    Any way you slice it, though, that's going to be tricky to tune, especially since it would appear you have the hot sides directly linked, with no independent control of one or the other.

    Best of luck, it's certainly an unusual build!
    Check out the link I posted, and go down to the 2-stage section, looking at his "hot" side piping, it matches up, so that would probably answer those questions, but the "cold" side looks like it's missing the check valve that allows the charged air to bypass the small turbo in higher rpms. Very interesting setup, and I am super intrigued, but wish there were more pics of the setup. Here are the diagrams of how this 2-stage setup runs: Below ~1800 rpms

    ~1800-3000 rpms

    Above ~3000 rpms

    Quote Originally Posted by zax View Post
    Yeah I think you may be right. Something is strange when I look back on this.

    Looks like the EWG is intended to allow gases to flow into the second turbine. However, since the second turbine is much larger, I wouldn't expect the pressure to build behind the second turbine with an easy outlet like the hard exhaust piping.
    I see what you mean, think I'm going to have stare at this a bit more and keep comparing it to the flow diagrams.
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