Flywheel HP to wheel HP

[09TRD]

Originally Posted by andries

If the loss is 15%..

"15%" has no basis in fact.

Here, read this:

http://www.sportcompactcarweb.com/pr...t_4/index.html

"...Paulsen also believes that drivetrain losses are neither an absolute percentage nor a fixed number. Instead, he feels the crank-to-wheel relationship is far more beguiling. From his considerable experience, Paulsen suggests that low horsepower (100-200 hp) cars may suffer from as much as 15 to 20 percent of drivetrain loss at the rear wheels. For more powerful cars (200-400 hp), the figure is around 12 to 15 percent. And for mega-powered cars (above 400 hp), the drivetrain losses can reduce to 10 percent or less. What's going on? Getting into the physics behind this complex relationship is worthy of a project in itself. (Engineering editor, Dave Coleman says he's working on it.)"

The type of dyno is also a factor. Two different types of dynos will likely yield two different results - even when all other variables are identical.

Chassis dynos are tuning tools; they do not nor were they ever intended to be used to somehow "calculate" flywheel power.