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Message: [QUOTE="superpsd, post: 1106932, member: 15821"] The bypass valve is not used. All superchargers for a gas engine have a bypass. Uses a vacuum actuator to open the valve. A diesel has no manifold vaccum to open the valve. The valve is currently blocked off. The mounting plate is built is not milled for the valve. This is why I see 1.5 psi @ idle and up to 5 psi pre turbo most of the time. The bypass I installed has two free floating flappers that acts as a one way valve. Boost pre turbo holds the flappers closed and once the turbo vacuum pulls hard it pulls the flaps open. Here is an example of a 5th gen vs a TVS. The effeciency maps are greatly improved on a TVS. [IMG]http://www.camarohomepage.com/THRSS/superchargercar/725.11.jpg[/IMG] Here is the difference between the discharge side the M122 on the left with the silencer slots and TVS on the right. [ATTACH=full]144764[/ATTACH] [/QUOTE]

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