I'm sure that every car is different, but my 360 Magnum that is equipped with a Vortech V-1, S-trim centrifugal supercharger, is at full boost (10 pounds) about 3,600 rpm; maybe it's too small for the engine, and that''s why it never goes above the desired 10 pounds, but it's still at 10 pounds when the car goes across the finish line.
Go figure...
Additionally, I wonder where the information came from that a centrifugal supercharger has a parasitic drag of 18-to-30 percent.
Let's use my engine as an example:
My engine produced 445 rear wheeel horsepower on a chassis dyno. Most calculatiors I have seen contend that the rear wheel figure is 85-percent of the flywheel horsepower (15-percent drivetrain losses with an automatic,) That would peg my engine at 524 flywheel horsepower using the 85/15 numbers. The numbers I got were 524 and 78 for the drag.
My supercharger is driven by a 6-rib serpentine belt. My max RPM is 6,000.
I don't have any hard information regarding just how much horsepower can be delivered through a 6-rib serpentine belt, butam skeptical that it would be as much as 78. Using the other end of your formula (30-percent,) it would be 157 horsepower.
If someone on this board has information as to how much horsepower can be transmitted at the rpm's I am turning the belt (max of 6,000 rpm 7" pulley = 10,995 feet per minute, belt speed, I'd be interested to see it.
Thanks in advance,,,:read2:
