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It seems to me some people really don't have a grasp on the concept of what inertia is...a resistnace to a change in motion(direction, speed, etc.). I have driven several cars with lightweight flywheels...my Honda had a 9lb and honestly I expected a night and day difference in the speed at which the engine lost and gained revs and it was not incredibly noticable. I never had a problem between shifts, I don't know who the ham fisted drivers are who have these problems but, it was never a problem with me. After riding in a car similar to mine with a stock flywheel I did notice that the RPM's lingered longer than mine did when you let off the gas pedal. And I also felt a noticeable difference in acceleration I thought this was simply my head but, I was skeptic it would make a difference. In first and second it was really apparent. I know that according to the formulas this should have the greatest affect on the acceleration due to the gear multiplying factor but, first and second didnt allow enough time for the engine to pull through a gear long enough to notice. But third and fourth the car seemed noticably stronger.
As far as drag racing goes having a light flywheel may help or hurt you depending on your car...if you have a serious wheelspin problem a light flywheel will allow more energy to be absorbed as the tires move the vehicle resulting in a gradual application of torque to the wheels wheres, a heavy flywhell would be more abrupt resulting in wheelspin. The opposite applies if your car has too much traction.
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