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Thread: CRX vs. NSX street race video

  1. #11
    Variable Bitrate
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    So does the diverter valve not make the cool "ppsssffftt" sound? Any performance gains from doing it? I think I read somewhere that it decreases backwash and therefore reduces some turbo lag. I seem to not have as much of a quick kick when i step on the gas like i was used to with my old eclipse gsx ('90 & '91). Other than doing the ECU reprogramming, what other mods are good for a little extra power, but not a ton of cash? Oh, and someone can flame me anytime and tell me worng post, wrong group, or whatever... I can take it....

  2. #12
    MySQL Error Scouse Monkey's Avatar
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    The blow off valve, i believe, is our term for what we call a dump valve.

    this is located in the engine inlet (compressor) side of the turbo as oposed to a wastegate that is on the exhaust (turbine) side.

    The wastegate is triggered by a mechanical pressue swtich (eg a calibrated spring and a lever) so that when a set compressor PSI (boost) is obtained it leaks air from the turbine/exhaust side to prevent the turbo spinning any faster and going over this pressure rating. A typical setting would be 10-20psi going from stock to tuned levels. 14-16 is normally a max before engine mods are needed such as uprated intercoolers and strengthened components on a typical engine.

    It is the wastegate you adjust on an engine to up the boost. They can also be electronic and controlled by the ECU letting you 'up the boost' via the electronics.

    This device is there to prevent over boosting which will blow the engine and over-revving the turbo. Turbos are very highly stressed components due to high temps and pressures and the high RPM speeds necarssary.



    Back to the blow off valve/dump valve

    This device is there to prevent the turbo slowing down when the throttle is closed and the air is not needed - ie when you lift off to change gear.

    A turbo consists of a turbine, in which exhaust gases enter the outer edge and expand exiting the middle of the centrifugal blade and then continue down the exhaust joined by a shaft to a centrifugal compressor blade in which the air enters the middle of the blade and is compressed, leaving the blade at the outer edge. Therefore when the throttle is closed and the airway is blocked then the air leaving the compressor side has no where to go and will stagnate (back up and stop). This will cause the turbo to slow down. The blow off valve uses the high pressure of the air stagnating to trigger it and release the pressure and a lot of air (hence the woosh noise that ricers love to here when they lift). This air escaping therefore stops lag b preventing the tubo slowing down so when you next open the throttle the turbo is still already spinnign quickly and close to, if not on, boost.

  3. #13
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    I really don't think anyone gives a ****...lol

    might as well make this thread worth something

    Jan Bennett
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    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  4. #14
    MySQL Error Scouse Monkey's Avatar
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    oh i forgot to add....that video was lame. I could make a more entertaining video playing with my flacid penis!

  5. #15
    MySQL Error Scouse Monkey's Avatar
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    Quote Originally Posted by Red GTi VR6
    I really don't think anyone gives a ****...lol

    might as well make this thread worth something

    if i see a techincal question i have to answer it. cant walk away.

  6. #16
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    Quote Originally Posted by Scouse Monkey
    oh i forgot to add....that video was lame. I could make a more entertaining video playing with my flacid penis!
    Like? fcuk yourself?

    Please do entertain us

  7. #17
    MySQL Error Scouse Monkey's Avatar
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    Quote Originally Posted by Chris31
    Like? fcuk yourself?

    Please do entertain us
    view my webcam

  8. #18
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    Yeah, I know I jacked this thread, but it was kinda useless. Now I know a lot more about diverter valve and blow-off valves. Music coming from my car is not the only cool sound I want to have, hence my blow-off valve question. I'm personally glad that Monkey can't ignore a tech question... LOL

    ~Puff

  9. #19
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    Quote Originally Posted by Puffanug
    Well, I think I will jack this post... Seems like people here know a thing or two about little turbo cars... So, that cool sound from turbos after they wind up comes from the BOV (blow off valve), right? Is that the same thing a diverter valve? I have a 2003 A4 1.8T that I want to do some work on down the road, figured I take (steal) this opportunity to ask about BOVs...

    ~Puff
    be careful, modding the audi turbo diverter valve may throw some error codes
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  10. #20
    MySQL Error scott_fx's Avatar
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    Quote Originally Posted by Red GTi VR6
    fag














    was that a lowercase or uppercase fag?

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