vacuum bypass valve
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  1. #1
    Member GTi - 666's Avatar
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    Mar 2004
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    Default vacuum bypass valve

    i have noticed on my gti6 that when the vacuum line comes of the fuel reg the car fuels up to the point of missfiring on light throttle but goes like the clappers up top.

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    thoughts/suggestion on putting a bypas valbe in hooked up to a switch in the cab, off all good nice cruising, flick the switch and we are in race mode

  2. #2
    Demannu-facturing! Demannu's Avatar
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    Default

    Theoretically, if the system is working properly, when you are full throttle there should be minimal vaccum (usually absolutely zero) in the intake manifold... so when you are at full throttle on full load, the fuel pressure regulator is operating exactly the same as it would be if you just pulled the hose off. The only difference you're making is to over fuel the car on low loads and at idle, which the computer, via the EGO sensor, will try to overcome anyway. Overall benefits? None. If the engine does in fact go better up high with it disconnected, something is not right.
    Scotty

    Melbourne - Dandenong Ranges

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  3. #3
    Member GTi - 666's Avatar
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    Default

    true true but i was thinking mor of the benefit of having the fuel reg already at full pressure when the throttle closed having the gas ready for the go. however i didnt think of the spaz the ecu would be having at that point.

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