I am using a 7lb flywheel - winds up real fast

 

It seems to me that one other con that hasn't been menioned yet would be increased clutch wear. Due to the reduced rotational mass and inertia, you would need to slip the clutch more during any type of launch to avoid the jerkiness. And, just like brake pads, the more you "use" the clutch (any point between fully engaged and fully disengaged) the more wear you are causing. Is this correct, or have I gone too long without sleep?

 

You are correct, but get some sleep.

 

***There is no horsepower gain just responsiveness to the throttle and quicker rev building due to the weight loss.***

You are correct there is no hp gain of the motor but there is a hp gain to the rear wheels because the hp is not being wasted reving up the heaver flywheel.

 

Can the pros of a lightweight flywheel be compounded by left-foot braking?

That is, meet the reaction time necessary to maintain RPM.

 

I don't quite follow your question. If the clutch is disengaged and your trying to mach rpm's to wheel speed it won't matter if your hitting the brakes, it will just change the wheel speed you're trying to match. Is this anything close to what you're asking? Or is it about how fast the rpm's drop when shifting? Either way its all about the gas pedal.

 

I think he's asking if having a light flywheel makes it easier to heel and toe downshift.

It'll be easier to heel and toe with a lighter flywheel, as it'll take less pressure/less time on the gas to get the revs to climb to the point where you can shift and let off the clutch.

 

Left-foot braking reduces the time it takes to engage the brake after disengaging throttle and vice versa, since there is a foot already on the other pedal and thus eliminates some delay.

Heel-and-toe does something like this for shifting.

My question was if using that technique would enhance acceleration with a lighter flywheel.

 

Yea, I guess, whatever advantage the flywheel would give would still be there. As for the technique you speak of it would only be an advantage from pushing on the gas pedal earlier than if using the same foot to brake with. Probably not enough to matter, there are plenty of fast pro drivers that don't left foot brake, but some do. Its usually used early in the turn or in the middle not at that end.