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ok guys, first off putting in to light of a flywheel on a street machine is a mistake. Unless you love having no bottom end torque. On a track car it does not matter because they are always in the mid to upper revs anyways.
Ideal weight for a street KA engine is around 15-16lbs ideal weight for a street SR is around 12-13 lbs (SR flywheels are lighter than the KA version to start with).
These weights will give you a lot more responsive throttle and you will gain back some of the HP loss to parasitic drag. You will not sacrifice your bottom end torque at these wieghts.
thats what you should shoot for. As far as the inertia comments go they are true in the sense that the inertia is part of what gives you bottom end torque. Being bad for the engine ? No. Being bad for street use, where bottom end torque can be your friend ? yes.
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