Quickly determine centrifugal supercharger impeller speed from easy to understand impeller speed reference charts. Prevent expensive supercharger drive damage by knowing your centrifugal supercharger's exact maximum impeller speed. Works with all brands of centrifugal superchargers, regardless of model, pulley size, pulley type or engine rpm. Includes comprehensive formulas, facts, figures, frequently asked questions, history, how they work, and a manufacturer contact section. Used by professional racers and centrifugal supercharger manufacturers (endorsed and used by ATI Procharger, NMRA Racing and top 5.0 racers). Written by supercharger expert J.R. Granatelli of the famous racing Granatelli's and former Vice President of Paxton Products. 320 pages, high quality acid free paper.