Dump/Blow off valve on 4AGZE how???

[NoHachi]

Quote:Pressure isn't an issue on the SC because the SC is not before the throttle body. In fact a GZE is more responsive when the ABV is taken out of the equation. From your reasoning you would need a BOV on an NA.

If you think that is my reasoning, then you're not trying to understand what I'm saying. The supercharger is spinning, it its still creating a pressure differential over itself even if the throttle is shut. It pulls a vacuum between the compressor inlet and the throttlebody and creates a higher pressure at the intake manifold (if it is pumping more air then the engine). Compressor surge happens, its just a fact..whether or not it is a problem depends on the application.

You get a lot of surge with a normal compressor setup during part throttle cruising. Toyota added the clutch for that problem, so less of a need for a by pass valve.

Anyway, don't take my word for it. Check the specs for the bigger SC brothers in the GZE superchargers Eaton family..MP45 MP60 they all have em and I dont mean a ABV. Corkey Bells book on superchargers has a nice bit on it too.

I'll take your word for it that it isn't a very big problem on the GZE. Just stating that having one of these can make sense on an SC.