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The Horsepower Chain BookThe Horsepower Chain - #1 Best Seller Top Seller

Engine builders, and racers alike, think about improving the performance of their engines using this 4 stroke approach, or what I prefer to call the “old 4 process.” Sometimes people focus on the 4 critical camshaft timing events – intake valve opening (IVO), exhaust valve closing (EVC), intake valve closing (IVC), and exhaust valve opening (EVO) to characterize engine performance. This was a good step forward, but a finer breakdown is needed to really understand racing engines. Instead of the traditional 4 strokes, the modern high performance engine should be thought of as having 7 distinct individual processes. This “7 process” approach focuses on air flow through the engine and is a result of two decades of research while developing the world's most popular racing engine software -- "Engine Pro" - Read More


Psychology of Drag Racing BookPsychology of Drag Racing

Racers will spend countless hours fixing their race cars, doing routine maintenance, and tweaking with various settings, but they are much less likely to do anything with their mental game. If you ask other athletes involved in golf, baseball, or most other sports they are much more likely to talk about such things as centering and getting in the flow. However, for many racers, they spend more time working on their race machine than working on their brain machine. - Read More


Software:

Engine Pro Software LogoEngine Pro - Professional version of ENGINEjr. Many more details and recommendations to help you get the ultimate in HP and torque from your engine! Years of research, 100's of dyno tests, and 3 NHRA Competition Eliminator National Records later . . . this is the only "racer proven" software for the serious engine builder Drag Racing Software LogoQuarter Pro - Professional version of QUARTERjr. Ideal for Pro Stock Cars, Trucks and Bikes, and Competition Eliminator, Modified, Super Stock, etc. - or any drag racer with engine dyno data. Loads of graphs and printed output, just like from an onboard data recorder Racing Weather Station SoftwareDensity - The "ultimate PC based" weather station software. Works for any combinations of weather instruments and for every form of motorsports - drag racing, circle track racing, land speed racing, etc. Build your own weather station using this software
Racing Chassis Suspension SoftwareFourlink - The "original" software for rear suspension analysis. Contains a simple 5-step process to correctly set-up your complete four link rear suspension system, including shocks and springs. Find the optimum four link bar combination on your PC, before you ever go to the dragstrip to test Racing Clutch SoftwareClutch Pro - Professional clutch management software for Pro Stock Cars and Trucks. Also includes most Alcohol class and Competition Eliminator style clutches! Find the best clutch setup (base, counterweight, ring height, etc.) on your PC and stop testing setups that just won't work for your specific combination Land Speed Racing SoftwareBonneville Pro - Specially designed for the needs of land speed racers. Accurately predicts any vehicle's top speed, including one- and two-mile asphalt, El Mirage and Muroc dry lakes, and Bonneville Salt Flat short and long courses. Many graphs and detailed printed output

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My name is Don Terrill and this is a photo of me during the only full season I could stomach in Nascar. In that season I had three poles and two outside front rows -- better than any other engine builder that year. On this site I will share what I know that others don't.
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