I'm curently in the clutch/flywheel market because of a tranny replacement and I'm overwhelmed with info and opinions, let alone the pressure to get a new setup before "deals" dissapear and my warranty is up.

Does anyone know if I can properly mesh a HD clutch and stock flywheel properly? Can the stock flywheel be beaten on with a clutch such as the JWT, ACT or equivalent? I may be taking a gamble on getting a beefy clutch only, then have the dealership tell me on the spot that I have to take it in the azz and replace my flywheel with what they've got, "because it's fried and used"... I have 54k on the car, its N/A. As you read, I'm not crazy about lightened flywheels period, I don't really believe in them.

Maybe I should just prepare and buy a package (clutch/flywheel) at a good price before I go in there with the possibility of selling the flywheel at another time? Lastly, is it better to buy a flywheel that has a replaceable friction surface than not?

TIA,

Zquicksilver

 

https://my350z.com/forum/showthread.php?t=231147

I was considering this setup a few days ago, but this is why I'm not sure about the Nismo setup.
-I'm not sure the flywheel has a replaceable friction surface?
-It looks as if the clutch disk has a solid-hub vs spring-hub? Not sure if that matters... I just thought spring-hub would be easier on things.
-I'm not 100% sure he broke it in properly?

I got dibs on this until Noon today, what do you all think?

Zquicksilver

 

I have the entire Nismo setup here waiting for install. Can't go wrong with Nismo!

 

I just got a stock 06 clutch replacement and a lightweigth ACT flywheel (also SS clutch line) it feels great, no need for a aftermarket clutch unless youa re pushing alot of power. the stock clutch is well made. and cheap. all together the clutch/flywheel/SS line cost me 500 installed since I was getting my tranny replaced as well.

 

Thanks for your input guys...

Does anyone remember if the stock clutch disk has springs on it? The mechanics manual shows two different clutch disk in two different illustrations. One looks like the Nismo and the other looks like an ACT, lol...

Zquicksilver

 

Also, while looking for specific information, I find two different weights for the Stock flywheel and Nismo flywheel on more than a handful of websites!! WTF! A few examples... and it seems I always see the Nismo flywheel being 28% less than stock on ALL websites. Which would mean the the first link should be correct.

Stock: 30.0lbs. (13.6kg) vs. NISMO: 21.6lbs (9.8kg)
http://www.mynismo.com/products/?id=2521

The NISMO performance flywheel weighs approximately 23 lbs., making it over 8 lbs. less than stock, approximately 28% lighter.
http://www.sfxperformance.com/parts/NIO12310RSZ30US.htm

Unfortunately, that math also shows Nissan engineers the Z flywheel has to be 25.5 pounds to damp things properly.
http://www.sportcompactcarweb.com/pr...t_nissan_350z/

ACT offers two versions. The Street Light is the most popular. Weighing in at 16.9 lbs, it is 8.6 lbs lighter than stock.
http://www.z1auto.com/prodmore.asp?m...ne&prodid=1973

Which is it, for both, and thanks?
Zquicksilver





Zquicksilver

 

+1 on NISMO, but consider something if you are going to get a flywheel which I would since you have the oportunity. You chould consider getting a flywheel/clutch combo that has been balanced together as one unit. This helps with shifting and vibrations.

 

I agree^^^

At the moment I'm torn between a JWT combo and ACT combo... the difference being about $100.

Which is the actual ACT clutch setup for the 350z?


Thanks,
Zquicksilver

 

I think the stock was 31 or 32 pounds.

I got the ACT flywheel (13lbs) even though I only wanted the prostreet (17lbs) but it drives great and I would even say better than a heavier flywheel becuase rev matched downshifts are smoother, upshifts are quicker and all around driving is easier, only engagement is off slightly, you just have to give it slightly more revs to not bog, but that could also be the 06 clutch, cause it is hella weird compared to the 03-04 style...

 

When they mention that the Nissan calculated what the flywheel mass should be, their goal was to reduce noise - going to a lightier flywheel will not hurt the engine, but will free up more HP while at the same time adding some noise.

-Peter

*I went with UR's flywheel(12lbs)/clutch combo...I should be installing it shortly.

 

^^ so what your stating is the Nissan engineers figure it needs to be 25.5lbs and greater to reduce noise/ chatter? Because I would have thought the SCC guys would have weighed the flywheel on a scale before coming up with such a precise number. 30lbs and 25.5lbs are definitely different.

Zquicksilver

 

the SCC guys are idiots alot of the time....

and I forgot to mention.... that whole dumptruck noise thing people talk about at idle? yeah... I gots it. sounds retarded when you are at a drive through and you can hear it coming off the wall... very annoying... couple that with my clunking diff and people think I got one messed up car

 

Yeah, +1 on the cement truck noise.

I have a JWT clutch/flywheel combo. It makes a lot of noise at idle, so much so that people regularly stop me at autoX events to ask if that is the throw out bearing, and how Porsches have such-and-such fix for it, yadayadayada. Of course they look at me strange when I say it is normal, but hey...

I would definitely recommend the lightweight flywheel. Not so much for any sort of speed increase, but for how much it improves overall shifting feel. Shifts are super precise and are lightning quick, and rev-matching and heel-toeing are much more fluid. Priceless if you ask me.

 

I remember reading another thread yesterday from a guy who just installed act clutch and prolite flywheel, he said the cement noise gone after 1500rpm. While other clutch kits are usually around 2000-2500rpm. So the ACT is probably the least cement mixer noise...?

Sorry to jack the thread.. but anyone know why street clutch is more expensive than the "off-road" clutch for ACT?

 

That's what I'm gathering too... The ACT makes a little less noise than all the other clutch/flywheel setups. I'm not sure if that has to do with manu./construction of the product, good engineering or both?

I'm considering the following right now...

-JWT clutch/ flywheel
-ACT clutch(HDSS)/ flywheel(streetlight)
-Exedy clutch(stg1)/ Fidenza flywheel

All within $100 of each other

I've got to make a decision by tonight or in the morning.
Zquicksilver

 

probably because of certification costs? but I do not know. also I know their prolite flywheel is more expensive than the prostreet because of certification for the FIA I think it was.

but yeah, my clutch ONLY has it under idle or accelerating from idle in a high gear I get it 750-1500 then it's beautiful VQ!

and I also think the ACT is a dual mass flywheel unlike some of the others... which helps with the noise

 

Some things I found interesting about the ACT flywheels... (all ACT info)

Forged Chrome-Moly
Induction Hardened Intergral Ring Gear
Stronger Than Cast Iron, Billet Steel Or Aluminum
Durable & Thick Enough To Be Resurfaced
Certified SFI Specifications 1.1 - Legal For Racing

Most stock flywheels are heavy cast iron and are designed for optimum drivability by storing some of the engine's power in the form of inertia. Light flywheels provide significantly improved engine response and acceleration by compromising drivability. Many aftermarket flywheels are too light, fragile and expensive.

ACT Streetlite Flywheel Info:
16.9lbs
Preferred For Street & Drag Racing
Better Drivability Than ACT Prolite Flywheel

ACT Prolite Flywheel Info:
13.2lbs
Lightest Flywheel ACT Offers
Preferred forRoad Racing or Minimum Inertia
Teduced Drivability


And the Nismo flywheel... (all Nismo info)

Machined from top-quality, preheat-treated billet 4140 steel. Our flywheels are precision machined with an integral cut ring gear. This results in a far superior and safer operation than bolted-on ring gears. After machining, flywheels are given an additional surface head treatment, greatly improving ring gear tooth life and reducing wear to clutch friction surface.



The only thing I like about the aluminum flywheels are the replaceable disk verse resurfacing. Is it worth having your flywheel consist of 50 parts when all is done or is it better to have a 1 or 2 part flywheel like the ACT or Nismo?
This is what I'm contemplating at the moment... lol.

Zquicksilver

 

I think this is the guy with that ^ comment...
https://my350z.com/forum/showthread....t=act+flywheel

MiaPlayer had an interesting break down... post#11
https://my350z.com/forum/showthread....t=act+flywheel

And this surprised me... post#4
https://my350z.com/forum/showthread....t=act+flywheel


Zquicksilver

 

Correct, that was the thread i was talking about.

Interesting threads...

I'm hoping to get the ACT clutch/flywheel combo as well.

After reading the above threads... I'm looking to get ACT 6 Puck sprung with Prolite flywheel

 

i just got my car back from te dealership last night after geting the trans replaced and istalling my jwt combo. Get the flywheel, you will believe in them when you feel how respsonsive you car is afterwards. i'll be able to give a full review once i get some mile on the trans and break it in.