deltawedge

Yes, is the short answer. This assumes that the car is in gear while deceleration. The lightened flywheel will resist the decelleration less than the stock flywheel, so the energy not absorbed by the flywheel will go to the brakes.

This amount of energy is very small compared to the kinetic energy of the vehicle when in motion, so it doesn't add much heat.

rooster20

Thanks for everyones input. I did do a search before I posted... ended up with 300 irrrelevants about 951's. Anyway, it's good to revisit these topics... I mean we're talking about 10 year old cars here... what hasn't been said?

Drive On

nile13

Why does it give back the energy during braking? It starts to give it back right away, during acceleration, no?

RallyJon

No. You're thinking about it the wrong way. If the engine is increasing in RPM, how could a mass attached to it help it increase in RPM? The flywheel will always try to maintain it's speed. It will resist acceleration (increasing in speed) and braking in gear (decreasing in speed). A flywheel acts to prevent change. A sporty driver wants change to happen more easily.

hn

I thought, from what I read, there is no need to change the flywheel if you want to stay with the standard one ?

cmoss

Definetly noisy... It gets a little aggravating--then I just step on the floor-mounted go fast button, and all is well.