New Magnacharger

CaliSpecial said:

LOL. This is quite funny! The Magnacharger boost bypass valve works exactly the same way as the bypass valve on any other screw type blower. It is operated by vacuum, pure and simple. There is no 'special' way you can use the throttle to make it work or not work! On light throttle, when there is high vacuum, the valve is pulled open and boost is bypassed. As soon as you step on the gas, the vacuum disappears, the valve shuts and off you go. The only difference between the Magna bypass system and the others is that the Magna bypass valve is internal.

I know this because I thoroughly researched this blower before I bought my TVS. I seriously considered buying it as Stage3 were doing a killer deal on it at the time. You can find this information on Mgna's web-site if you can be bothered to look for it, that's where I originally read it.

Andy.

Click to expand...

I'm not certain this is completely true, or that Walter is necessarily incorrect about this. Looking into a Roushcharger for my F150, I noticed that the bypass valves in most Positive Displacement Supercharger kits for the modern 3V engines aren't 100% vacuum operated like they were with the old 2V or 4V engines. According to Roush, although the specific function of the valve is vacuum operated, the bypass valve operation itself electronically controlled by the circuitry that controlled the charge motion control valves that are not reused and tossed aside with the installation.

The bypass valve event can actually be set to open, or close earlier throughout the power band based on the torque sensing parameters of the ECU tune and not necessarily based on the amount of vacuum, or manifold pressure present.

The major difference between the Magnacharger and a Twin Screw like the Kenne Bell, Whipple, FRPP is that the Twin Screw is continually compressing the air under all levels of operation, even while not pressurizing the intake. This actually contributes to higher ACT driving around under vacuum and most likely limits the amount of initial timing present. This is probably one of the major reasons Roots/Hybrid based kits seem "snappier" around town. The Mangacharger, TVS and any of the other "Roots/Hybrid based" blowers on the other hand aren't compressing the air under vacuum and thus ACT's remain consistently lower during general driving.