New flywheel + clutch?

LiquidZ

I'm a little concerned about street behavior. Dropping a 20 lbs. will drastically change the rotational inertia of the flywheel.

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ZYUL8R

Yes it will change the inertia of the flywheel, you are correct.

Usually you have to get up more revs before you engage the clutch to prevent stalling it. But its not all too bad, you just get to relearn your clutch.

The lower the flywheel inertia will allow downshifts to be smoother since the engine will rev more quickly. Also upshifts will be smoother since the engine will derev more quickly to the proper RPM.

On my old set up shifts came lightning quick as the clutch engagement was pretty much immiediate. Heel toe'in was a breeze too.

I can't wait to try it with S-mode...it should make our synchro-rev match work a whole lot better.

Phimosis

Doing a little math: The JWT unit says it's 15.4 lbs and 45% lighter than stock. That implies the stock unit is 28 lbs (28 x .55 = 15.4) and the weight savings would be 12.6 lbs (28-15.4). Not as much as what people in this thread were stating. Does that make it less scary? Who knows. The decrease in the moment of interia could be even more than the decrease in weight, depending on how it is constructed.