Lightweight Alum Flywheel question

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Feb 17, 2005 | 05:34 PM

Cold_B

Thread Starter

Drifting

Joined: Mar 2004

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Lightweight Alum Flywheel question

The previous owner of my car put in an alum flywheel. My question is how much RW gain would one normally see on a dyno?

Has anyone ran their car on a dyno, installed the alum flywheel, and then ran again and noted the difference of RWHP?

Just curious really.
Thanks!

Feb 17, 2005 | 06:04 PM

Zix

Le Mans Master

Joined: Jul 1999

Posts: 8,683

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From: Phoenix AZ

Quote:

Originally Posted by Cold_B

It's not really there for RWHP, it allows the engine to rev quicker. It MAY help with HP but I doubt it would be very noticable.

Feb 17, 2005 | 10:22 PM

Photomania

Melting Slicks

Joined: Dec 2004

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Look in Ekler's catalog (maybe even their website) and they may mention a number. I think I read somewhere that the aluminum flywheel will boost horsepower by an extra 24 stallions. -- Eric

Feb 24, 2005 | 03:37 AM

96CERon

Instructor

Joined: Aug 2004

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Light flywheel benefits

If I did the calculations correctly this is the benefit of the 13.5 Fidanza vs the 39lb. dual mass. I found a site that says a rule of thumb for kinetic energy reduction is 1 HP per 10 lbs of virtual weight reduction--It is a function of gear and rear axle ratio.
For the 3.45 rear gear:
Trans Gear 1 2 3 4 5 6
Virtual lbs lost 303 203 116 80 56 39
Equiv HP gain 30.3 20.3 11.6 8.0 5.6 3.9

Also check this site: http://www.vetteweb.com/tech/0407vet_flywheel/

Feb 24, 2005 | 07:46 AM

Red Tornado

Team Owner

Joined: Sep 2002

Posts: 22,209

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From: OBAMA IS HITLER

when i bought mine from carolina clutch (13# fidanza), the sales pitch was an average 20hp gain to the wheels. this seems to echo the calculation above.

Feb 24, 2005 | 10:16 AM

tjwong

Le Mans Master

Joined: Jan 2003

Posts: 8,596

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From: Portland Oregon

Quote:

Originally Posted by bradvette

when i bought mine from carolina clutch (13# fidanza), the sales pitch was an average 20hp gain to the wheels. this seems to echo the calculation above.

It basically just frees up Hp that would be required to move the extra mass. So it is a good sales pitch and it is no BS

But plain facts and physics.

Feb 24, 2005 | 01:46 PM

rocco16

Race Director

Joined: Dec 2002

Posts: 13,348

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From: SCMR Rat Pack'r Charter Member..Great Bend KS

Quote:

Originally Posted by tjwong

It basically just frees up Hp that would be required to move the extra mass. So it is a good sales pitch and it is no BS

But plain facts and physics.

I agree. It doesn't ADD or MAKE more power, it just doesn't absorb as much when accelerating as a heavier unit would.

Larry
code5coupe

Feb 24, 2005 | 10:25 PM

ToyC4

Drifting

Joined: Feb 2004

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From: Champaign, IL

St. Jude Donor '05

Quote:

Originally Posted by Cold_B

one of the vette magazines did this with Fidanza flywheels a couple months ago, they did two c5's and I want to say one picked up 12 and one picked up 18 - the car with the bigger gains in hp had a lot more mods to start with
I can't find the link but it's online and I know I've got the dang magazine somewhere