Fidanza flywheel - before & after videos

[Daemione]

 

 

Not a drastic difference, but it's appreciable & quite fun. Both videos were taken with the car in neutral & clutch engaged, the difference with the clutch disengaged is greater. I also upgraded from the 225mm to the 240mm clutch & pressure plate, so the net weight loss was 8.5 pounds (compared to the 12lbs. 11oz. drop in flywheel weight).

 

Just thought I'd share.

[proxlamus©]

i closed my eyes and listened to each video individually right after each other..

 

big difference! thats pretty cool! How is driving the new clutch in traffic? a whole new experience huh?! haha

[Daemione]

All the difference in the world with the new clutch. I'm still in the break-in stage, but a hundred miles and I've started to get used to a normal clutch again (although it's still a little grabbier than I expected). The old one was in ROUGH shape, slipped like crazy with anything more than the gentlest throttle, it was like driving on eggshells to get it up to speed. I almost couldn't even get it up on some ramps it slipped so bad.

 

For kicks, here are some pictures of the old clutch disc -

[JMortensen]

I don't know about the Nissan FI, but I know my Toyota had mechanisms in there to make it decelerate more slowly. Just judging from your videos, that seems slower than the carbed light flywheeled L28's I've driven. Might be my imagination, but that's the way it seemed to me...

[cygnusx1]

Oh definitely, an improvement but Jon is right, the EFI engines tend to decelerate more slowly due to a myriad of devices designed in, to do just that.  The BCDD, the dashpot, the vacuum limiting valve (don't have the official name of it) on the ZX turbo manifold....just a few things that I vaguely remember which keep the engine decelerating slowly.  It was all mostly an effort by Nissan to reduce emissions in the nasty "decel combustion zone".  Some of the devices really make the car annoying to drive in a sporty manner. Eventually you become desensitized to it.  I love the Fidanza flywheel in my turbo Z and like the way the motor revs come back down with all that decel rev-control stuff that I removed..  My Weber Z with Braaps old lightened flywheel, responds really, really quick, both up and down.  It's a pleasure to rev match.

[Daemione]

Faster decel engine speed isn't a big priority for me. On a daily driver (which is what this car is) I don't want to worry about have to worry about rev-matching clutch wear on an average lazy upshift. But the reduced inertia does make rev-matching a lot quicker when I do want to pull off a more aggressive downshift. And I suppose it technically does make the car faster overall, although you'd be hard pressed to measure a difference.