While the value of an automatic transmission for the drag strip is undisputed, Automatic Transmissions typically keep mechanically boosted cars (centrifugal methods) making more power over three pedal cars, RPM range is critical here...here's why:
Nut shell: Useable efficiency range of the compressor
The science: Every impeller design has a speed range where it’s highly efficient at moving air. With today’s computer-aided design (CAD) and automated profile machining, these RPM ranges tend to be fairly wide, but that wasn’t always the case.
Within the sweet spot of an impeller’s efficiency range, the dynamic sealing between the blades and housing improves to the point where the system begins to seriously tax the inlet airflow characteristics and whatever might follow the supercharger in the sequence of intake components. This means that when the blower starts to get in its performance curve, anything in the rest of the intake tract that can’t handle the flow will seriously compromise the net effect of the supercharger. While this is true regardless of the general type of supercharger installed on an engine, it is particularly true with the centrifugal types because of the remarkable change in airflow that can take place with a very small change in engine speed.
Where I got this from:
https://www.diyford.com/centrifugal-superchargers-guide-in-ford-small-blocks/
