I already did a search, and I only found this.

https://honda-tech.com/zerothread?id=54813

My question is, anyone else know of any dyno number differences?
I still have a stock flywheel and was wondering how much difference a lightened or aftermarket lightweight flywheel would do.

Yes, I know about it reving faster, and the RPMs drop quick when you push in the clutch, but wondering if anyone else has any dyno proven graphs on flywheel.

 

anyone?

 

im wondering the same thing, but I care mostly about how it will drive.
if you reduce the rotational mass of your engine, it should pull under
load more efficiently using its power to accelerate from x1 rpm to x2
rpm... so you should see a slight global increase in tq transfer on the dyno
at peak load times. I would estimate 3-5whp across the curve going from
stock 15-22 to say 6-8lbs. the most important thing is the acceleration and
the dyno doesnt really show that unless you time your pull. then again,
depending on the setup you have... you would only be tranferring more of
the power that is already there through a now more efficient drivetrain.

 

A lightened flywheel will have almost no effect on the power and torque output of the engine. The reason a gain shows up on a dyno is because of an inherent flaw in the way it measures power: it measures how fast the engine accelerates a mass. Well, the engine has to accelerate itself as well, and this shows up as a loss of power on the dyno. The loss depends on the moment of inertia of the engine (flywheel), the gear the car is in, and the moment of inertia of the big ol' drum that's part of the dyno. So, if the car was in fifth gear, the apparent power gain from a light flywheel would be much smaller than if it was in first. Also, if the drum was really heavy, the apparent power gain would be smaller.

Ultimately: yes, the car with the lightened flywheel accelerates faster in lower gears, but no, it does not put out more power. The dyno is flawed.


Modified by Lsos at 2:12 PM 7/8/2003

 

considering my GSR clutch weighed 45lbs and my current clutch is 23 lbs... hmm.
thats a bit of a weight savings, let alone rotational mass drag my clutch went in on friday and it has 215 miles on it. I can already feel the car is ALOT more responsive and accelerates FASTER. It might have the same whp... I dont debate that... however the effect of the horsepower is to make the motor accelerate faster... and it seems to effectively accelerate the car that is attached to it a bit faster also... its awesome. seems like the MPG went up as well. I will log my first 12.6 gallon tankful results once Im done with it. I had 175 miles before I filled up on a half tank on this clutch so far...

 

Mikesarr_GSR-

You felt an excelleration difference just from changing your clutch?

 

the whole clutch, flywheel included... sorry if that wasnt clear...