[Tom McQueen]

Originally Posted by Tom Vaught

The Chrysler info says the Demon Supercharger is a 2.7L per revolution unit.
They also say it can move 33000 liters of air in a minute.
Simple math say at 14.5 psi they are spinning the supercharger 12,222 supercharger rpm.

Not a big rpm number like a Lysholm Screw Supercharger (18,000) but still a very respectable supercharger rpm.
The Liters per minute or airflow works out to about a 1165 cfm supercharger unit.

1165 cfm (assuming a 12.4 air/ fuel ratio) says they are playing it a bit safe on the tune-up. Being a drag race crate engine they can get away without running Stoichometry. And they have a good EFI system so 12.4 is a safe number for 14.5 psi of boost.

The Supercharger, based again on simple math, says that the supercharger is taking away about 100 hp from the Engine HP number and that lower HP number is feeding the transmission.

Looks like you have a good S/C unit there Tom

Tom V.

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As usual, your numbers are very helpful. And the 100HP parasitic for the Demon supercharger tracks with that of the Hellcat. Its generally accepted that the smaller Hellcat supercharger has an ~80 HP parasitic.