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Message: [QUOTE="Charles, post: 406115, member: 103"] If you want to make power, then step away from the straight rotor blowers. That's just not the way. Efficiency seems to be eluding your thought process right now. I haven't seen the article you're talking about, but it's good to hear they had success with that truck. I don't know if they used any of it, but I did have a number of conversations with them about that truck when it was just a concept, and actually gave a lot of advice that it seems like they may have followed there. I haven't talked to them in a long while, but hopefully I didn't steer them wrong on that one. If it's making that kind of power then it must have worked reasonably well, regardless of whether or not any of my ideas were used. The second stage is merely for pressure increases and load sharing. The volume of air the system can flow is still precisely governed by the volume the first stage will flow. This is why I said it would be foolish to place a positive displacement unit ahead of the turbo. The blower would move the same air volume independent of anything the turbo was doing, and down low the turbo would be doing nothing, and up top the turbo would only be heating the air and pulling a vacuum on the blower discharge. At some point you're going to need to turn your concept around backward. You can run a 200mm charger AFTER the supercharger if you want.... and you're not going to accomplish even one thing more than what the supercharger would do by itself. Running TWO turbochargers AFTER the supercharger is retarded to the second power, lol. You would just have the biggest vacuum cleaner ever. LOL [/QUOTE]