Reply to "Photo Blog: LS9 Engine Swap (6.2 liter OHV Chevy V8, supercharged, 638+ BHP)"

quote:
just from a google search, I found mention that the blow bypass valve was vacuum operated.

with high manifold vacuum (and boost not needed) the butterfly opens and reduces the parisitic load of an useless blower.

with loss of manifold vacuum (accelerating or high power demand) the butterfly closes.

maybe just disconnecting the vacuum hose would do the same as the tie wraps, but it sounds like a feature you would want

please note this is just keyboard mechanic/engineering as I an humbled by your work


You are exactly right, there are three things that control the butterfly, vacuum, boost and the electronic solenoid. You could be right, disconnecting the vacuum line may indeed solve the issue. I may experiment with having it connected/disconnected and also having the boost line connected/disconnected to see how the engine and boost behave. But I couldn't be happier with how it runs with the 2 tie wraps! Smiler
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