What does the flywheel weigh on our 3800s? I'm assuming * I, * II, l67/36s are same fws.

Well, it is actually a flex plate, since all our cars are automatic transmission. The flex plate weighs maybe five pounds. But the rotating mass would include the torque converter full of trans fluid bolted to the flex plate and there is another, what -- 15 or so lbs? Do you need to know the exact weight of the flex plate?

No, was just curious. Friend w/ 1.8T Audi TT'* motor takes forever to wind down when it'* revved... and he said his flywheel was 22 lbs and I said that'* probably why because it takes a bit to rev up too. Mine'* pretty much instant compared to his. So not looking for exact spex.

Add the weight of the harmonic balancer and crank/rods/pistons into that.

It'* the whole rotating assembly that matters. In our case, that ALSO includes the camshaft and balance shaft, as well as both timing gears, etc.

The hanging revs in a manual car have to do with emissions. Keeps the cat at a steadier temperature when it'* receiving a steady stream of exhaust in between shifts.

For your friend, a lighter-weight flywheel and lighter-weight pulleys would make the revs drop faster in between shifts. At least they did on my old Hyundai Elantra with a stick.

well, manual cars have an actual flywheel, instead of our flexplate, and a flywheel is pretty much a solid flexplate that'* about 3x as thick...so a lot more metal in there than our quasi-porous flexplates.

Right. But we have a torque converter spinning with it, they don't.