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Message: <blockquote data-quote="turbology" data-source="post: 317540" data-attributes="member: 10223">In this case, I kinda support your arguement. You are correct at some extent.Heavier flywheel will retain the rotational mass, so the rev dont' drop quicker during every gear change.And vice versa for lighter flywheel.So you gain some "flywheel energy" when you upshift from 2nd to 3rd. (you arguement correct until here)But what happen when you shift to 3rd? RPM drop.Now, your engine need to speed more energy to rotate the flywheel again (and if flywheel is heavier, it need to work harder), before the energy can be transfer to your clutch, then to your transmission, then to your wheel, then to the ground.More energy is lost at flywheel between up and down of RPM.Heavier flywheel only help or ease shifting gears, but decrease acceleration/deacceleration.The driveshaft is connect directly to differential, which also mean the rotation speed of driveshaft is relevant to your vehicle travelling speed (faster you go, faster the driveshaft turn)Since there is no quick change in RPM on driveshaft, it does not need to hold the rotianal mass.So thicker shaft help retain the energy and give more torque does not apply.</blockquote>