To appease my own curiosity, how much hp/tq would you get from an aluminum flywheel on a very lightly modded Evo. Thinking about getting one when my clutch goes.

 

None, to the crank anyway. Lightweight flywheels do, however, decrease drivetrain loss and will get more power to the ground faster.

 

Yeah you dont really "gain" hp. I have the WORKS aluminum flywheel 10lbs and I love it so far

 

Every time i have heard the aluminum fw's they make that loud *** chatter sound....haha most noobys on the streets always think that the cars gonna explode or something

-John

 

Anyone else. I'm hoping to decrease some of the nasty drivetrain loss that AWD cars suffer. It is a cheap enought mod when the clutch is replaced, so I wanna know if it is worth the money.

 

On the EVO you are only saving a few pounds so I don't know if it is worth it. A matter of opinion. I perfer a good chrome-moly over aluminum. If the stock one is still good, then it's extra money. If the stock is toast, then it's a good time to consider a change.

 

really I have been driving for over a year on my ACT/fildenza (aluminum flywheel) for over a year now and have never had a problem with chattering sounds at all.

 

I figured since the cluch was out, mighn't as well. I also have the WORKS flywheel and am very happy with it. I have the WORKS CK2 clutch kit wich is also great. Think about how many mods you are doing long term though, I really wish now that I had done the twin plate. Cluch is a really big job on this car, so plan ahead. I did my cluch myself, I know the cost to have it done is not cheap.

 

Just for the record: a light-weight flywheel DOES add horsepower, but does NOT add torque. Horsepower is a measurment of torque VS time and a light-weight flywheel changes the time factor. An engine can do the same amount of work with the same amount of torque, but in less time with light-weight rotating assembly...

 

Not reall. HP is a measurement of torque and rpm (HP=Torque x RPM/5250). On a accelerometer (like Dynojet) rather than a load type dyno it doesn't measure HP but calculates it from how fast it can accelerate a giant drum. For example on a Mustang dyno or other load bearing dyno you can set the load to hold the speed at a certain rate. If the dyno is holding the speed of the drum, then the HP should be no different from a light to heavy flywheel. The engine is still making hp since work is being done. The point is that the difference is acceleration, not HP and the tradeoff is lack of inertia. You are sort of trading off stored energy (inertia) for kinetic energy (acceleration).

 

Horsepower is a measurment of torque and RPM. The M is minutes, the time factor.
In the dyno drum scenario: The weight of the drum is precisely known, probably to the ounce. The amount of torque required to accelerate the drum to a given RPM in a given amount of time is precisely known. If you were to decrease the weight of the drum by 10 lbs but did not "tell" the dyno computer that you did this, it would show an increase in horspower for every car dynoed.
My boss and I had this discussion a few years ago and we came to the same conclusion: If the torque is the same but the work happened faster, horsepower was increased. If less time was required to do the same amount of work with the same amount of torque, horspower was increased...
Not that I am trying to contadict the ACTman, I have read many of your posts and I respect you very much!