"The underlying concept behind this program is the vehicle. While the name implies that it is solely used for selected transmission gear ratios, this can not be done properly without taking the entire vehicle into consideration. The same ratios might not be appropriate for vehicles with different engines or weights so we have gone forward and used all this information to help you select the proper ratios for optimum performance. With this concept in mind it does have to be understood by the user that you do need all this information about your vehicle in order to get the full benefit of this software. Ideally you need to know the vehicle weight, area and Cd. You should also have a dyno sheet for the engine that shows either the torque(preferred) or horsepower for the engine over the intended rpm range you are interested in using with this software. These torque and horsepower numbers need to be corrected to sea level, something that most modern engine dynamometers will do for you automatically via the software included with the unit. Any information you have on the existing transmission is also helpful as a starting point. Sample engines and transmissions have been included as examples are not guaranteed to be a usable example for your vehicle. These entries are for demonstration purposes only! "\
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This is from the help file... There have been users of the program who have sent feedback, saying the program is pretty equal to what they concluded from windtunnel data and actual time slips with gears selected..
The program enables to find the best gearing set arrangement for the vehicle, only after you input the accuracy of the parameters. CD, HP or Torque, vehicle weights etc etc. Will even let you input nitrous loads in there..
Jon