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Thread: Turbo VTEC

  1. #1
    Panarus biarmicus Moderator (Sports) SmartWombat's Avatar
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    Turbo VTEC

    I started some thread drift over in my "Hood Ornaments" thread in Viewfinder.
    So I'm opening the discussion here

    I thought the principle of the dump valve was to dump pressure on the inlet side?
    So that when you lift off the throttle the exhaust gases keep the turbo spinning, it doesn't stall against the build up of pressure.

    I can't see a reason for a dump valve on the exhaust manifold. This looks more like a separate atmospheric wastegate, where my car has it internal in the turbo housing bypassing into the exhaust outlet under computer control.

    Though I know race cars aren't at all like my road car
    PAul

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  2. #2
    The red headed step child jgredline's Avatar
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    Re: Turbo VTEC

    SW
    Perhaps I am misunderstanding what pipe you are referring to..Can you put an arrow on the photo to the different pipes to make sure we are both on the same page?
    Thanks Javier
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  3. #3
    has-been... another view's Avatar
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    Re: Turbo VTEC

    Quote Originally Posted by SmartWombat
    I can't see a reason for a dump valve on the exhaust manifold. This looks more like a separate atmospheric wastegate, where my car has it internal in the turbo housing bypassing into the exhaust outlet under computer control.
    What you're saying makes sense to me. As I (very basically) understand it, that's how my VW TDI works.

  4. #4
    Panarus biarmicus Moderator (Sports) SmartWombat's Avatar
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    Re: Turbo VTEC

    Here are the images, I didn't want to edit and repost them without your permission.
    I've marked the exhaust flow with little arrows, and outlined the junction plate on the turbo and ringed the valve.
    Attached Thumbnails Attached Thumbnails Turbo VTEC-raceengineandcar-edit1.jpg   Turbo VTEC-raceengineandcar-edit2.jpg  
    PAul

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  5. #5
    The red headed step child jgredline's Avatar
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    Re: Turbo VTEC

    Basically, the waste gate is used to control the amount of exhaust flow to the turbine..This is what is used to control the boost...



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    Panarus biarmicus Moderator (Sports) SmartWombat's Avatar
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    Re: Turbo VTEC

    Thanks, looks like it's mechanical with a set boost pressure ?
    Or is that little brass pipe in the last photo a union for a pressure feed, to give the driver a boost control?
    PAul

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  7. #7
    The red headed step child jgredline's Avatar
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    Re: Turbo VTEC

    In this picture it is mechanically set to 9 psi.
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    Panarus biarmicus Moderator (Sports) SmartWombat's Avatar
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    Re: Turbo VTEC

    Wow, that's just over 0.5 bar - my road car is running 1.0 and with the remap 1.5 bar
    And that's such a huge turbo too, I was expecting around 1 to 1.25 at least.
    PAul

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  9. #9
    The red headed step child jgredline's Avatar
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    Re: Turbo VTEC

    SW
    Oh, that was min boost..This engine was run at 45lbs of boost and made over 900Hp.
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    Panarus biarmicus Moderator (Sports) SmartWombat's Avatar
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    Re: Turbo VTEC

    That's more like what I expect form a turbo that size !
    How long do you expect the engine to last when delivering that power?
    PAul

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  11. #11
    The red headed step child jgredline's Avatar
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    Re: Turbo VTEC

    It will last about a season of drag racing.
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  12. #12
    Panarus biarmicus Moderator (Sports) SmartWombat's Avatar
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    Re: Turbo VTEC

    If the boost on my engine is turned up to 1.5bar, and the engine remapped for 120bhp (only 50% gain from 80bhp) then the life is estimated at 6000km.
    So that is pretty poor compared to the impressive lifetime you're getting !
    PAul

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  13. #13
    Film Forum Moderator Xia_Ke's Avatar
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    Re: Turbo VTEC

    Man, what I'd give to have my old CRX-Si back with THAT stuffed under the hood
    Aaron Lehoux * flickr
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  14. #14
    Panarus biarmicus Moderator (Sports) SmartWombat's Avatar
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    Re: Turbo VTEC

    Hm, it might not fit in a CRX but maybe it would fit on an Atom.
    They tend to use supercharger though, not turbocharger, around 100bhp less.
    PAul

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  15. #15
    Film Forum Moderator Xia_Ke's Avatar
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    Re: Turbo VTEC

    It'll fit with a little front end work ;) Do a search on a guy named Ed Bergenholtz and take a look at the CRX he used to race
    Aaron Lehoux * flickr
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  16. #16
    Senior Member Jimmy B's Avatar
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    Re: Turbo VTEC

    Looking at the photos it looks like it's hooked up to a DTS Dyno?
    JB

  17. #17
    The red headed step child jgredline's Avatar
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    Re: Turbo VTEC

    Quote Originally Posted by Jimmy B
    Looking at the photos it looks like it's hooked up to a DTS Dyno?
    JB
    Good eye..It is indeed..
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