Lightweight or Mid-weight flywheel?
 

I'm about to have a shop do my clutch/ flywheel/ CSC and trying to decide to go with a lightweight or "mid-weight" flywheel. Is the only disadvantage of the lightweight flywheel the noise? I was also told that the midweight is a waste of money to either stay stock or go to the lightweight one.

Any of you have the mid-weight and do you like it and did you feel a difference?

Thanks.

I have not used the car for anything other than street driving in recent years, but plan to get back to the track at some point. It doesn't have any big power mods and I will keep it that way.

I have the lightweight and can say it's honestly one of my favorite modifications to my car. The way the engine Revs is night and day. For me the chatter doesn't bother me and I had my tuner increase my idling RPMs a couple of hundred which reduced the chatter to where its hardly noticable. However, I have heard some people are more sensitive to it than others. For me I cared more about the performance gain and how the cars sounds while driving/reving. Also if I was going to pay the same money for the flywheel and labor for the install, I wanted to go as light as possible.

Maybe someone who has gone the Midweight option can speak to there experience. I believe they recommend them primarily for people who drag race the car and/or those who are sensitive to chatter.

I have the ZSpeed EZStreet Stage 2 clutch/flywheel combo, and I highly recommend this one for its overall performance. Joe told me he'd rate it conservatively to 400tq, but the pedal pressure is just a bit more than stock. No longer will you get the "rubber band" lash trying to ease into 1st, and it just feels plain solid.

The flywheel is 20 pounds, and I thought this would be too light. However, it is just right!

Thanks guys. I decided on the JWT clutch and flywheel (lightweight at about 15lbs) according to the shop guy's recommendation. I don't think the noise will bother me, as long as there's no down-sides. I am aware of the revs dropping between shifts but I'm ok with that.

Go zpeed!

Update... How's the jwt?

To the street drivers with light flywheels: what was the transition like in terms of relearning? I’m a lifelong stick shift driver, but I always worried that getting stuck in traffic or navigating parking lots would become miserable.

Don't know? Ask Joe!

www.zspeed.com

I have zspeed 17.5 lbs flywheel, I am more annoyed about where engagement happens than the flywheel itself, in fact, I don't think I feel a difference about it compared to stock, as it revs slower in low rpms and revs quickly when you go higher.

I only wish I went for lighter flywheel, I like the 8.8lbs flywheel on my race car, which I found easy to drive.

It's great! I'm completely satisfied with it. It definitely is noisy in traffic, but doesn't bother me at all. The clutch pedal feel is stiffer than stock, but I got used to it very quickly and don't even notice now. The lightness of the flywheel allows it to rev up super quick and feels amazing! Feels like an added 30hp! Of course no real HP has been added, but it feels that way b/c all of the wasted energy of rotating that heavy stock flywheel is now free. And the responsiveness makes rev matching while heel-toe easier too. Overall, I'm extremely happy. And he found the cause of the noise that I've been living with for years! It turned out to be busted upper control arm bushings. Got that replaced, and now I'm driving the car much more than I have in the past few years. Thanks for all the recommendations!

Thought it would be worth following up on this one since I did actually make a decision.

My CMC went out completely last week, and although I was lucky enough to already have a CMAK kit waiting on my parts pile, it was silly to waste the labor installing it and not include a clutch.

I opted for EXEDY’s Stage 1 kit, that comes with a 20 lb. flywheel. It was not cheap, but totally worth it. I understand now why going even lighter wouldn’t be hard to manage, since I’m sure I’ll get used to the feel in another day or two. Rev matching on a down shift is almost effortless, and I love the response over the boat anchor bolted to these engines at the factory.

The EXEDY kit is also an excellent option on a street car. It eliminates the dual mass flywheel with no added chatter, which I didn’t expect, and modulates from out to engaged so well I don’t think I’m going to bother upgrading the pedal assembly.

It takes a little bit to get used to it revving a little easier/quicker. I had an hour drive home from having mine installed and was pretty well adjusted by the time I got home, though.

Revs go up AND down faster and the car definitely felt more responsive.

I'm running the Z1 lightweight flywheel. According to my bathroom scale w/ and w/o holding the flywheel, it's 13.5lbs. I think it's listed at 15lbs. Stock is ~31lbs.

Also, if iirc, the lightweight and midweight are both single mass versus the OEM being a dual mass, which means you'll get the chatter with either, so you may as well get the most benefit possible.

Slow revs are one of the biggest downsides to our engine; the lighter flywheel really changes the car. Even the lightest widely available ones are daily able

i think the only one that wouldn't be would be something like the Tilton 7 lb one which is for race cars and such

That style is like a light switch. Either in or out. No inbetween.

The response on my car was abysmal with the stock one. It was like they were trying to hinder performance where it wasn’t necessary.

Drivability and quiet. The extra weight of the OEM dual mass makes it easier to drive, specifically from a stop and has a urethane dampener that keeps it from chattering.

I know what they were thinking it would accomplish, but my EXEDY kit is significantly easier to drive, and it's got a solid flywheel that's 10 lbs. lighter. It doesn't have that weird over-center feel pressing and releasing the pedal, and feathers out smoothly even when I'm half-assing it expecting a little bit of bucking. I admit the pedal feel was likely partly due to wear, but like I noted in my earlier post, I (personally) don't feel any need to install an RJM pedal with the EXEDY kit as it functions now.

The only increase in noise is the tiniest bit of rattle when sitting at idle from the bouncing clutch fingers. You can hear it running the car next to a wall, such as pulling through a drive-through. It's got close to zero chatter, and I'd be so bold as to say less than the stock (maybe stock replacement) clutch that was in there before.

When I had my previous G37 I had them install a solid nodular flywheel from Z1 and a new stock replacement clutch. It rattled badly enough that I thought something was wrong at first, and then later found just life with these cars. Point is, if a specialty company like EXEDY can built a street clutch set that performs better in very way while remaining very easy to drive and stay quiet, I have no idea why a company like Nissan with millions in R&D could not.

Mine sounds like a diesel idle:roflpuke2: but the 19 or 20 models are now coming with an Exedy clutch. I don't know how deep the changes go, so not sure if the flywheels are any lighter or different in any way, though.

That's exactly what the clutch in my previous G sounded like. :icon17:

Hello, everyone. I didn't want to create a new thread (reducing clutter) so I'm asking here.

I'm looking for a good 10 to 12lb flywheel for my 2015 370z. Noise is no issue, I've been looking many places for one and can't seem to find one.

The only one I found is this, but I'm not even sure if it fits, nor the quality...
Competition Clutch: Forged Single Mass Flywheel

I heard about a South Bend stage 3 flywheel that weighs 12 lbs but I can't find any actual part for it (only a review).

Any help would be godly :icon17:

here is 1 for u. https://www.z1motorsports.com/clutch...6.html:tiphat:

How's the chatter at idle? Thanks

What was your lead time in ordering the hardware? I'm stuck in the same situation with a bad CSC & clutch, and the recommendation is to swap out the flywheel as well. Problem is that I've looked at Z1, ZSpeed and a couple others but everybody is on back order. Meanwhile my car is sitting in a shop with a mechanic waiting on a decision. I'll be damned if I'm going to pay a grand for an OEM flywheel and another 1050 for a OEM clutch.

I haven't ordered it yet so I can't provide a lead time. However, I'm certain I'll be purchasing the ZSpeed kit based on all the reviews I've been reading.

I specifically did not buy the "quiet disc" clutch package from Joe and asked for a light flywheel (ended up at 17lbs). I am disappointed that my clutch does not chatter at all :twocents:

:rofl2:

No chatter at idle. Sometimes a little chatter slipping into 1st, but barely noticeable. It operates EXACTLY like I prefer, and the operation is a thousand times more precise than OEM.

Good idea about bumping the idle up a little.

I really shouldn't have found this thread. Now I'm thinking about upgrading the flywheel next year or the year after, when I'll be upgrading the clutch.

a lightweight flywheel really changes who the engine feels. I've got a 12lb flywheel from ZSpeed in my car. No drive-ability issues. Very easy to drive.

You're not helping me :D

I already felt the car getting nimbler by putting a shorter final drive on it, and I'm betting this would be like another +1....and it seems like it's on the list now :ugh2: