This time last year I had a 90 horsepower engine and was a lost soul. I could not figure out how to get more power. This program was ordered, installed on the PC, and I read this book five or six times. A virtual model was made of the motor and I started to do computer based hop-up. One thing I learned was the "garbage in-garbage out" saying really applies. Actual flow test results, digital cam profiles, and measured compression ratios are essential to get decent results. I used approximations at first and then had to reanalyse everything over again when I got the better input data. The predictions were quite different depending on whether or not I used refined input.
The program manual has some guidelines about what to look for in all of the output graphs and tables. Good references are Vizard's books, Dema Elgin's website articles, and "The Horsepower Chain" by Don Terrill, among others. A couple of other engine builders gave me advice, too. It took months of late nights for me to figure out the various concepts.
The results are a 107 hp engine. This is right where most folks get with these engines powerwise. The upside of all of this work is that all of this is done with much smaller valves, lower compression, and milder cams than most other tuners folks are using. That is the beauty of virtual tuning. It is getting the right combination of parts.
The downside of the program is the exhaust tuning. Only limited options are available that can be used with wave tuning. The exhausts I made based on program data did not work at all. These engines need something other than open-ended pipes or meggas, like mufflers or reverse cones. The program could not model these with wave action.
Do I recommend the program? Yes. It is a good learning tool and an additional 17 HP from an already developed motor is not bad. The next step is to use another program that models many more exhaust options.