Question for the techs about oil consumption and flywheel/clutch replacement

[Tampa G35 Sedan 6MT]

I was just at the dealer today and they said that I will need a new Motor and transmission.

What motor will they be giving me? he said it is an updated 3.5! I'm like ok sounds good "Updated" lol

and does the new motor come with a new flywheel? (Service guy said he thought it did)

If it does should i got with the JWT flywheel or should i go for the stock one (if a new one comes with the new motor)

I bought the JWT flywheel but the guy said it would make a lot of noise. and now I am a little confused!

If anyone has video of the sound with a single disk flywheel that would be great!

DJ

[Poyzinous]

Try to get your hands on a Nismo flywheel. The Motor has been updated, yes. It is made to deal with the slightly higher abuse it takes from MT drivers.

[Tampa G35 Sedan 6MT]

How much are the nismo flywheels?

Will that eliminate the noise?

DJ

[Poyzinous]

I'll get you more info on the nismo one. Its a little more expensive, but its built better and more precisely than aftermarket ones. I've driven a Z and a G with nismo flywheels. I really had no clue since they were almost stock quality. revving it and the clutch response gave it away that it was lighter.

[joe603]

Make sure you keep your OEM flywheel...they are very expensive and I'm sure you could find a buyer. As for the noise, it comes from the transmission. The OEM flywheel is a dual-mass flywheel with weights to help suppress vibrations in the drivetrain (transmission gear lash). However, it is much heaver than a single mass flywheel (JWT, Nismo, and any other lightweight aftermarket one).

When you switch to a lightweight flywheel, this transmission noise is much louder and it sounds like a noisy rattle. But, the lightweight flywheel will help with acceleration/deceleration...more like a race car. The brand of flywheel doesn't matter, only the final weight....the lighter the more noise, but the greater benefit. Heaver ones help with noise but they are closer to stock performance-wise.

[Tampa G35 Sedan 6MT]

I did tell the techs that i wanted to keep my original flywheel. He said that he thought that the new motor came with a brand new flywheel.. I said well i still want to keep it then...

So maybe I will have a new flywheel that I could sell.... What do they cost at the dealer?

DJ

[Poyzinous]

a THOUSAND dollars. seriously. Remember that the lighter the flywheel, the more sensitive and harder it is to engage the clutch. Nismo part number 12310-RSZ30(US)

[joe603]

a THOUSAND dollars. seriously. Remember that the lighter the flywheel, the more sensitive and harder it is to engage the clutch. Nismo part number 12310-RSZ30(US)

My dealership quoted me $1600 for the flywheel only! The only reason I had mine replaced was they had to replace the transmission and I saved $700 on labor to install a new clutch/flywheel.

Anyway, yes it is much harder to engage the lightweight flywheel and "puck-style" clutch disk. Stop and go traffic sucks!

Now about the noise...I've heard conflicting reasons why my car now sounds like a concrete truck at idle and in neutral. The dealership even replaced my transmission twice because they thought the noise was due to a faulty replacement transmission!

I would like to get your opinion (and any other Infiniti Techs) on what exactly causes the infamous noise. It goes away as soon as I depress the clutch pedal or if I try to put it in gear with the pedal up (I can see the RPMs going down...probably not good for the transmission).

So, is the noise from the lightweight flywheel not canceling out engine vibration and thus causing the transmission gears to lash? Or is it caused by the heavy duty clutch clamping the flywheel harder?

Another reason I wanted to replace my clutch (the car only has 30k miles, and the clutch was still good) was due to the issue with high-RPM shifts. What would happen is the clutch pedal would stick to the floor and slowly engage with the clutch burning up the entire time. Ever since I replaced my flywheel/clutch it has not done this. I should mention that they also replaced the rubber clutch line with a steel one.

Thoughts?

[Poyzinous]

The noise is partly your transmission, as it is built in a thin casing. Other cars have quieter trannys, but they weigh 20 to 40lbs more than the G transmission. You can pick up the transmission if you're not a small guy. Thats one reason the transmission makes noise, not much natural sound deadening. The Flywheel and clutch are only noisy because of chatter, but a little chatter is normal. If infiniti wanted too, they could have added 20lbs of weight to the middle of the car in a layered bell housing and make less noise come out of the area. But they didn't, since the car is somewhat of a heavyweight already. Joe I dont see how they could charge $1600. Its a fancy flywheel and all, but at my dealer it sells for $1400. The noise goes away because the clutch harware stops spinning(as does the input shaft, naturally)

[joe603]

Interesting info on the transmission! I knew it was lightweight...but not by 40lbs! As for the cost of the OEM dual-mass flywheel, I may have been off...but I remember it was between 1400-1600 plus labor.

Have you had customers come in complaining about the clutch sticking to the floor under heavy acceleration?

So what if I reinstalled my dual-mass flywheel, but kept my heavy duty stage 4 clutch? Would the noise go away? Would I have the clutch pedal sticking to the floor problem again? What about the other way...keeping the lightweight flywheel and using an OEM clutch?

[Tampa G35 Sedan 6MT]

they told me that a stage 4 would be to much for the stock flywheel!

But I bought a stage 2 and they said it would be fine... I want the benefits of the speed but i am a little worried about the noise!

DJ

[Tampa G35 Sedan 6MT]

Joe can you post a video of this noise...

I am really scared now on what to do with the flywheel

[Tampa G35 Sedan 6MT]

found a few videos of the difference in the revs and wow...

It is like night an day...

Before http://www.youtube.com/watch?v...lated

Afterhttp://www.youtube.com/watch?v=W3ANRhcgbh0

[Poyzinous]

In my experience I only had one customer with a clutch pedal sticking to the floor. He had his lines replaced and there was air in them. When the clutch is down, the pressure plate is released, and there is no torque transfer, so I dont understand how the car would move forward. That case seems to me that the clutch disc is just getting roasted against the flywheel. The truth is, I have yet to hear a silent clutch/flywheel combo since its just normal properties of the cars design to have some noise. The stages (in most cases) apply to the power the motor is producing and the pressure plate pressure rating(usually in stage rating like clutch) and the flywheel used. A friend of mine has a stage 4 clutch disc and plate combo. he has 200 freakin horsepower. Absolutely no need whatsoever for his 15 second civic to use a clutch setup. He routinely stalls, and I struggled to get it going smoothly without revving the motor past 2000 rpm. When the motor is producing more lowend torque, i.e. forced induction or just lots of mods, then you want a stronger, more precise and lighter flywheel for quick revving, and as far as the clutch and pressure plate, you need a stronger disc to couple the added power, and a pressure plate that applies more force so that it grips the clutch and flywheel together so that there is minimal slip. Most of you guys here have just intake, exhaust. Unless your G is pumping out more than 330whp, you dont need more than a stage 2 clutch, and you dont need a flywheel any lighter than 16lbs. As a matter of fact, your stock clutch holds up to 300hp already, and can hold the 25hp from intake and exhaust. Once you throw in headers and spacers and other mods, sure, a 24lb flywheel and a 300lb(?) pressure plate may be a little weak. But The nismo flywheel is good to 600hp (i've been assured) and nismo clutch (r-tune, which i believe is stage 2) is good for it too. My friend doesn't need a stage 4 clutch unless his H**** civic was making 700pp. He is MUCH happier with his stage 2 and 15lb flywheel. Joe, dont worry over the noise. As long as everything is installed properly, and the product you use is quality product as far as build, accuracy, and design purpose, you'll be fine where you're at, and with 40 more hp as well.

[Tampa G35 Sedan 6MT]

Well i have made up my mind that I don't care about the noise and i want the added power!

I just wish someone could post a video of the noise so that I am sure that I want to keep my mind made up lol

DJ

[joe603]

The reason I went with a stage 4 is because I do plan on getting a supercharger eventually. The opportunity just presented itself to replace the OEM clutch when my transmission started to have issues with the syncros. (I had a whining noise and difficult 2nd gear engagement). They were doing the labor to replace the transmission and it was only an extra $150 to do the clutch/flywheel.

Perhaps I jumped the gun and should have went with a stage 2...but I can deal with the tricky engagement.

[Tampa G35 Sedan 6MT]

Does the new motor come with all new parts..? Alternator, water pump, belt, etc.?

[Tampa G35 Sedan 6MT]

bump

[joe603]

Usually it's just a long block...I doubt it comes with the alternator, AC compressor, belt...but I would think that the water pump is included.

[Poyzinous]

The long block is bare. Water pump is internal. Accessories are reused, as is your flywheel. You get everything from the oil pan to the valve covers. Nothing above or below. Intake manifold and plenum is reused, all accessories and add ons too.

[Tampa G35 Sedan 6MT]

Damn lol...

and what is so updated about the new motor? What changes

[Poyzinous]

The cylinder block has narrower tapering at the bottom of the cylinder wall and the rings are set for tighter clearances. Everything else is unchanged