AmericanPie

I see where some tuners offer a choice of a steel or aluminum flywheel with their engine packages. I know an aluminum one allows the engine to spin up faster with better overall response and will help give a few extra HP, but it also requires learning a slightly different technique when starting from a standstill. Are there any other, more serious DISadvantages to running one on the street?

vetterdstr

You will feel a little more vibration from the engine as it runs...

VR

Dark-Knight

You'll get noticbly better throttle response. You'll probably also have a sound comming from you motor that sounds like a cement truck, no kidding.

PHPD7102

I have one and I deff notice my motor rev's up faster. I dont notice any more vibration than with a steel wheel and noise is comparable as well.

I was told by a couple of old timer 1/4 mile guys that steel is better for launching stick cars because when you drop the clutch the heavier wheel has more inertia........not sure if it really makes a difference just repeating them.

PaPaChoc

I’ve been out of racing for years but when I was running a 331 SB I had a 40 lb wheel.. That was the trick set-up for launching at 6500 to 7000RPM. It helped to keep the car from bogging.
My $.02

Jeff Jeff

Advantages: Engine revs quicker, making it easier to match revs when downshifting. I have not noticed any differences in launching or driving techniques. If you run slicks and launch at RPM's you may notice it more.

Disadvantages: Shifting at high rpms the engine has a tendency to over-rev easier. The stock balance on LS1's from the factory is not the greatest, so you may experience more vibration.

If you do replace the flywheel, make sure to have it balanced to the old flywheel/clutch assembly. Some engines are externally balanced with weights on the flywheel.

ericdwong

I have the Fidanza unit and I don't hear any excess noise. Perhaps you are referring to the c4's with the OEM dual mass flywheel, and when you change it then you get the sound?

As for drag racing, I saw no benefit. I'm posting the same numbers ET and MPH as before, although I havent compared the 330' times. It does take a different technique to launch.

wango tango

It is definitely noisier inside the car. You can hear it most when its in neutral and the car is idling with the clutch out. Press the clutch in, and it goes away.

It is definitely trickier to drive, at times I wish I still had the heavier one.

Good for engine braking too, this hasn't been mentioned I don't think. Road Racers like a lot. Drag don't.

Red5

I like my fidanza almumn flywheel. it works great for autocrossing/roadracing. But I don't know if it would help for drag racing.

The good: Rev quicker. Faster mid range.

The Bad: (for me) teh clutch chatters when cold.

Coc5

Spec stage 4 aluminum flywheel setup here. The ONLY issue I have is the engine does take a little more throttle from a start to move the car smoothly so it doesn't hesitate.. As for noise and other. Nothing.

C54DAZ

spec II w/ Fidanza Aluminum flywheel and I Love it.. Revs quicker seems more responsive. No noise either. I would do it if your doing a new clutch. Make sure you have them balanced together.

rodknock

I have Luk Pro Gold with aluminum flywheel and I don't notice any noise,just it seems to rev up a bit faster.

6Speeder

Spec II with Fidanza, has survived heads/cam for 10,000 miles, lots of 1/4 mile trips. Works great, no noise, chatter gone after about 6-700 miles. Relearn your low throttle leaves by adding 200 rpm, and it's smooth sailing. AND NO MORE LAZY CLUTCH PEDAL.

John Shiels

Great mod it took me ten seconds to adjust.

Rob'sC5

I have alittle chatter but nothing annoying. The revs do come up alot faster. Made a few 1/4 and 1/8 passes and seems to work pretty well for me