yeah the benefits are small but as they say it all adds up, i might get my other flywheel lightened to like 8-6lb and see how we go, maybe theres a point to where it gets to light and starts to negatively affect F/E
remember a flywheels 2 primary designs is to smooth out engine pulses and convert though pulses into a more linear power curve
Flywheel - Wikipedia, the free encyclopedia
i would also like to say that the toyota k series engines are naturally very torquey engines so even though the flywheels may sound heavy when in use the car still goes "hard",
also this test increased MY fuel economy, it may NOT increase yours as you dont drive a 28 year old car, imporvements on cars have been made since then
