racer02GTstang

you dont need to tune for a flywheel... but you will put down more power once its on... it wont increase the hp at the crank... but you will lose drivetrain loss and get more at the wheels which is where you want it.

joeybutts

That's a great way of putting it. Thanks guys for helping out. Much appreciated...

Colorado_Mustang

It actually takes less power to keep a heavy flywheel at speed than a lighter one. With a lighter flywheel, you will use more engine power when cruising down the highway, and less accelerating. (READ: Lower highway mileage, quicker ET's).

paco_pony

there is power and torque loss in the drivetrain as the engine has to overcome the rotational inertia of all items in the drivetrain. so theoretically, a lighter flywheel means less rotational intertia which means more torque and hp transferred to the rear wheels. so theoretically you might see slightly higher dyno numbers after the flywheel install than before. but honestly I expect the overall impact to be minimal (a few hp?).

prior posters are correct. adding the lighter flywheel shouldn't affect the optimal fuel tables or ignition timing in the tune.

net, net your true rwhp (after the flywheel) might be a few ponies higher than what the dyno says

GodAmGT00

Understood...

I would think that Torque would be the only Force affected by swapping a Lightweight Flywheel, not so much HP...



Then again, most Dyno's don't dictate Torque, they calculate it based off of HP, and Power curve plus Air/Fuel, etc...



JT

joeybutts

Will i actually feel the difference of the flywheel change? I could feel changes in most of my other performance enhancements, even the intake spacer. Just wondering what to expect.

paco_pony

JT, i think you are right for load dyno's (e.g., mustang). they directly measure work over time (hp) and then back into torque. but I think that inertial dyno's directly measure acceleration (drum rotation over time) and then backcalculate into hp with mass and time and then backcalculate into torque. just a technicality, and I may not even be right.

regarding whether torque or hp is affected, since hp = torque*rpm/5252 you affect torque, you affect hp and vice versa.

paco_pony

honestly, I aint know.

what does mfgr state about hp/trq gains if any?

How much weight are you saving in the flywheel?

my a$$dyno can't detect anything lower than about 10-15hp, and I doubt you'd get anything more than that (although i'd take an extra 10-15 every chance I could)

joeybutts

I'm not sure about weight savings, i've heard amounts anywhere between 8-13 lbs, so i am gonna take the average and say 10-11. And i haven't ever seen anyone talk about hp gains from flywheels. I find it interesting and that is why i started this whole thing!

GodAmGT00

That Rocks!!! Thanks for that clarification.. I couldn't remember the equation for figuring out HP vs. TQ.. I'm no good at Physics anyway, so I'm not even going to bother trying to figure out load differences from the flywheel to the aluminum piece...



There's gotta be a little bit of a deviation though for TQ, but aren't the 2 forces Linear??



JT