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Old 10-14-2005, 09:42 AM   #4
Scooby Newbie
Member#: 36625
Join Date: May 2003
Location: Pacific Northwest
2006 Evolution 9
430 ft-lbs / 535 whp


Originally Posted by Unabomber
Flywheel FAQ

How does a lightweight flywheel improve performance? A transmission can be thought of as a fulcrum and lever in a car. First gear has a really long lever; second gear has a shorter lever, etc. The lever represents the mechanical advantage that gears give your vehicle. When your car is moving, you have two factors that are present during acceleration, one is driveline losses, which are constant and the variable, which is vehicle weight and the mechanical advantage supplied by each gear. While changing to a lighter flywheel will give the user little to no changes on a dyno, the apparent changes are quite dramatic due to the greater mechanical advantage. ...
Appreciate the FAQ. Would like to improve its technical accuracy. A lighter flywheel doesn't actually increase "mechanical" advantage. Its better to say that a lighter flywheel requires less energy to make it spin. That energy then goes to making the wheels accelerate more quickly. The extra energy is most apparent in 1st gear because 1st gear has the greatest mechanical advantage.

Originally Posted by Unabomber
Flywheel FAQ

How much will a lightweight flywheel affect my car's performance? This Excel document will allow you to find out for your WRX or STi application.
Predictions in the worksheet match what I've calculated, but the bar chart at the bottom of the WRX and the STi worksheets is actually the result for the "BMW" example in the third worksheet. It looks like it was copied over without adjusting the source data.
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