What amount of power can they handle safely/efficiently?
Is it worth upgrading if you are at about 350(+) whp?

 

Is there a horsepower limit to a flywheel? Lighter just lets you rev faster. OEM should be fine if you don't mind the weight.

 

well at what point should you upgrade because the heavy flywheel is holding you back?

 

When the angular acceleration of the flywheel becomes so great that it uses the majority of the available power to spin it up.

Basically, I'd say you would be ripping through the gears fast enough at 300+ whp to warrant a lightweight flywheel. You'd probably see a benefit in 3rd gear at that power level which you really wouldn't see stock.

 

well Im about to go FI...so Ill have close to 300 whenever I sleeve the block.

Is it easy to change the flywheel if you have to pull the motor out to get it sleeved anyway?

 

yeah it is