Ah, very interesting... mentions diff between roots/eaton and lysholm.
Using the Bypass Valve will only work with a Roots/Eaton... it won't work with a lysholm. If you are using a lysholm type, you'd use both all the time, rather than switching off between them. The Roots/Eaton have almost no parasitic loss if they are not "blowing".. Interesting..
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Here you go..........
It has to do with how a Roots blower works. Unlike a Lysholm compressor that compresses the air between the rotors, the Eaton compresses air externally in the plenum. It’s really a “blower” instead of an actual compressor. So on an Eaton blower, if you do something that equalizes the pressure between the inlet and outlet ports (like opening a big bypass valve) the blower stops doing any work, so it stops taking much power to spin, and it stops generating as much heat, because it can’t compress air unless it has a sealed plenum to push the air into. So whenever the bypass is open, it doesn’t matter if I have the whole system pressurized to 20 PSI with a turbo, the blower sees no pressure because it has no sealed chamber to make pressure in and it can’t make pressure inside the blower because it’s just a blower. Your parasitic losses with a big bypass valve (I use a 2.5” valve now) should be around 1 HP with the valve open. I thought about building a clutch or using one off of a Mercedes, but I talked with a Mercedes tech that told me it wouldn’t be good for track use. They program them on a Mercedes not to engage if the motor is already revving very high, or it would destroy the clutch, and when I hit the gas I want some boost, no matter what RPM I am at.
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I think the key to running it through both would be adding a second intercooler...