Ok I'm just wondering about what is the benefit of a lightweight flywheel.... Since the 7's rev so high anyways what would the purpose be of it... What exactly does it do? It revs quicker, but would it take longer for it to slow down or what? I'm just hella curious, because I don't know if I want one or not.....

 

It throws off your torque, while adding horsepower. You'll also go through clutches faster unless you buy a higher quality sort.

 

I thought it would add torque...

 

It does not add or subtract anything. A lighter one just releases the energy that is already there.

 

it doesnt reduce torque, just makes it a bit harder to take off at lights. making it seem like youve lost torque, but in reality it just frees up hp and tq, not adding anything. less power goes to turning the flywheel, so more reaches the wheels. you will see faster reving, and revs will also fall faster, so if you have a turbo it could hurt in the shifts slightly, but no biggy. i havent owned a car without a lightweight flywheel, and never will. gotta have one in all of my cars

 

Alright cool, so no benefits but no disadvantages really. So I'm just going to keep the regular flywheel when I put my new clutch in... thank you..

 

I went for a lightweight flywheel and clutch. Not worth it in my opinion.

I would rather have taken that $700-800 that I spent for everything and got a really nice port and a few other things.

Get a port and headers or something like that. Flywheel stuff isn't worth it.

I didn't notice any difference other then negative on the low end. Eh, my .02

 

yes there is a benifit... u get more power to the wheels..

lets think of dynos for a second.... there is a thing called driveshaft loss.

example
your car has 205hp at the crank but only 140hp at the wheels that is because of the driveshaft loss aka the amount of moving enertia on the car between the crank and the rear wheels. IF u lighten the load it will take less hp and less tq to move the rotating assemble which will up your hp and tq AT THE WHEELS.. remember the only power u can use is the power at the wheels..

u will loose a touch of the line and going up a hill can be a pain t times HOWEVER in the end the power and tq that this will free up and make USEABLE i well worth the 350.00 for the flywheel..

go with a lightweight flywheel and u will not be disapointed..

as for going through clutches faster I cant agree... I have always used a quality clutch kit and a quality lightweight flywheel and have never had a problem with excessive clutch wear..

 

Horsepower will not change!!!!!!!

From Mazdatrix:

The actual horsepower of the engine does not change related to the weight of the flywheel. However, to increase the engine RPM, and accelerate the car, all rotating weight (as well as the entire car) must be speeded up. This requires power, and the heavier the part, the more power needed to speed it up. The less power needed to speed up the flywheel (and rotors, clutch, driveshaft, wheels, tires, car, etc.) the more power available to speed up everything else. The question we are asked frequently - "How much more horsepower will my engine have with a light flywheel" - is not the right question, because the answer is NONE. What you will have is more available horsepower to accelerate the car and yourself down the road.

The trade-offs are as follows: the heavier the flywheel, the smoother the idle, the easier the starting is from a stop, and the smoother the cruising/slight throttle changes are. BUT - the slower the acceleration is. The lighter the flywheel is, the harder it is to get the car moving from a stop (just requires a somewhat higher RPM before the clutch is let out - which wears the clutch faster), depending on porting, intake, and exhaust, the idle will be somewhat rougher, and some "jerkiness" may be noticed while cruising. BUT - you will be able to accelerate faster. This is true to a much lesser degree on fuel injected engines than on carbureted engines.

 

correct the hp and the tq dont change HOWEVER your wheel hp will change... your ENGINES hp and TQ will not change but the amount of power it can put down to the wheels will change.. you free up some of the unusable hp and tq


again think fo a dyno...

BEFORE light flywheel crank hp 205... crank tq 225....wheel hp 145...wheel tq 175
AFTER light flywheel crank hp 205... crank tq 225....wheel hp 160...wheel tq 195

again these are just oddball number I made up that is not to say u will gain that much or even more at the wheels just figures

as u see the ACTUALY engine hp and tq NEVER change because engien tq and hp is figured AT THE CRANK... wheel hp changes due to less rotating mass

wheel hp/tq aka USEABLE hp/tq

Dave

 

Yes, you are correct in that rear wheel HP/torque will increase very slight. I know on new Vette's, the HP will increase @ 2.5% with the installation of an aluminum flywheel, which isn't very much, but better than nothing.

 

We'll yeah, of course your going to gain HP & TQ because the only way we rate cars HP & TQ is at the wheels, I mean installing a lightweight flywheel will increase it at the wheels which means more power, and as for clutchs, you need an upgraded clutch if you factory one cant handle the powered your puting on it.

 

at 400 hp thats 10 hps just in a flywheel thats not bad....

remember all cars are way different some have more or less drivetrain loss

Dave

 

Whoa, no one said that. there are advantages and disadvantages, like spooledup said above. But the advantages greatly outweigh the dis, imo

 

IMO there are MORE advantages then disadvantages .. another good thing is if u buy a fidanza flywheel over the ages when the face gets pitted, couged, or warped u can buy new surfaces for under 100.00 and bolt them back in.. I sell both the fidanza flywheels and the faces

Dave

 

Yeah, I had a Spec flywheel on a previous car. Spec told me when they started out back in the day they still sold Fidanza stuff. So it was actually a Fidanza, but they still made me a custom friction surface for it, for under $100.

 

Yea, but spending $700/$800 (Z06 Fidanza flywheel/Spec Stage 1 clutch assembly saving 24lbs) not including the installation, is pretty steep for 10 hp.

You could figure maybe 5/6 HP on a modified Turbo II.

 

yes but whena clutch is already needed, the extra 350-400 is well worth it to go ahead and free up hp, improve throttle response and overall performance. Or if you cant swing an extra 350 or 400, go with an ACT flywheel like I did. I got a Streetlite recently for under $300

 

True!

 

got my flywheel balanced with the rest of the internals. I'll let you know what difference that makes when i get it back

 

I sell most of the flywheels for 300.00 or less...

btw on a 60K car 700.00 should not be much (refering to the Z06 comment)

 

would going from stock to a 10-12lb flywheel be a good idea on a daily driver/ downhill runner

 

I have NEVER had a problem using a lightweight flywheel on a daily driver...

NEVER

Dave

 

10-12lbs flywheel?? if you're gonna do it get the 8.5 lbs fidanza one.

 

I agree if u are gonna spend the money go with th lightest one

Dave