FLYWHEEL AND CLUTCH

[bluepitbull04]

I HAVE A 06 COUPE AND IM LOOKING FOR THE BEST FLYWHEEL AND CLUTCH COMBO TO GET. IM IN THE PROCESS OF TWIN TURBOING MY G BUT FIRST I WANT TO BEEF UP MY TRANSMISSION TO MAKE SURE ALL THAT POWER REACHES THE TIRES. THEN IM GOIN TO BEEF UP THE ENGINE THEN DO THE TURBO INSTALL. ANY HELP IS GOOD HELP

[joe603]

You'll want a good stage 4 clutch and a lightweight flywheel. I have a competition clutch setup and it's great other than the noise from the single mass flywheel.

Make sure to get a steel clutch line too...usually comes with the kits.

[bluepitbull04]

im not to worried about noise im all about the performance any brands u recommend

[Poyzinous]

Glad you fixed your Caps lock button. Yeah focus on your needs first. Side effects come later.

[Sentientbydesign]

"Stages" are pointless as they are all specific to a manufacturer.

JWT, Fidanza, and RPS all have replaceable friction surfaces on their flywheels.

BE SURE that you're ok with your G sounding just like a big-rig. The competition flywheel and the JWT give off a nasty sound if you don't drive them just so. In return, you get more ponies to the wheels...I personally like my RPS Cyn-R-G and street clutch combo, but I need to bleed my lines as the pedal drops whenever the fluild heats up.

[joe603]

Competition clutch has been great for me...other than the noise from the transmission.

The reason you will get noise is because the car was designed with a dual-mass flywheel to smooth out the drivetrain pulses. The transmission is very lightweight with heavy gears. If you eliminate the dual-mass flywheel, the pulses are transferred to the transmission and the result is gear lash while in neutral.

[bluepitbull04]

its probably to late since i already brought a flywheel and clutch combo from stillen but does the gear lash cause problems down the line

[Sentientbydesign]

its probably to late since i already brought a flywheel and clutch combo from stillen but does the gear lash cause problems down the line

My understanding was that the gear lash was always there, the dual mass flywheel just prevents it from being heard and felt. Maybe Chano or Steve will chime in to clarify.

[Tampa G35 Sedan 6MT]

The Noise isn't bad. To me it is the Stiffness in the clutch



DJ

[2mhighside]

Wow its been a really long time since ive been on here and I still see some of the same people so thats awesome to see. I just moved back from the middle east and pulled the baby out of storage. Some of you may have remembered i Blew up the motor with a spanky new turbonetics kit last year. Well while they were installing my new motor i went ahead and installed the JWT light weight clutch and flywheel. While its not turbo'd yet the clutch has been a great addittion other than the fact it sounds like a kenworth at a stop light. It quickly redeems itself while i roast the 275/20/30's from the light. Its a great set up and will be great when i unburry the turbo kit out of my storage locker.

Cheers

[tollboothwilley]

+1

I think the JWT combo is a great upgrade. I like the pedal feel and its performance characteristics.

I hear the "big rig" sound at idle in neutral (friends car) but its not nearly as loud as I was under the impression that it would sound.

[USAF_G35_Guy]

Wow its been a really long time since ive been on here and I still see some of the same people so thats awesome to see. I just moved back from the middle east and pulled the baby out of storage. Cheers

Welcome Back! Glad you made it back in one piece! Looking forward to seeing the future car pics....Good luck w/ the build!

...as far as the post topic. I to have the JWT LW Flywheel and if you're going for performance then you won't mind the little bit of rattle noise at all. +1

[pfarmer]

its probably to late since i already brought a flywheel and clutch combo from stillen but does the gear lash cause problems down the line

Possibly! If a specific flywheel is designed to dampen drivetrain impulses then changing to a lighter or heavier weight will change how these impulses influence anything attached. This would not be all that unlike changing to a lighter or heavier pulley on the other end. What would be a little different is that it changes again once the clutch is released and car starts down the road. What may not be evident is that the influence may cause damage away from the immediate area. For an example lets say you have 6 bearings in a row, #1 bearing at the front of the engine, #6 at the end. An issue caused by a different weight flywheel could cause an issue with all the odd bearings, or all the evens, or combinations based on the harmonics of the crankshaft. If bearing #6 was loaded differently then a problem may show up in #5 (now loaded heavier) which would possibly unload #4 which now loads #3 and so on. The same goes in the other direction since you also need to look at the entire assembly as a unit.

I have seen this in various industrial equipment so no reason to think it couldn't happen here. This is not to state that you will see a problem but if you can hear a change then I certainly would state that the entire assembly is also 'feeling' a change good or bad.

My personal feeling is that it probably is causing some damage, but that is a tradeoff for a performance gain in spoolup. Is the performance gain worth the risk? That has to be decided by the one who takes the risk. The risk may be a very real one but it also may be a risk that doesn't show up on average for several hundred thousand miles, long after you no longer care. Or it may come into play far earlier.

Perry

[USAF_G35_Guy]

^ Good point.....could be the reason I'm having transmission problems at the moment. 20k miles give or take later after the install. OR it could be the fact that everywhere I read the 03 trannys SUCKS BALLZ! Either way, I'm sure my occasional roasting of the tires doesn't help either

[pfarmer]

^ Good point.....could be the reason I'm having transmission problems at the moment. 20k miles give or take later after the install. OR it could be the fact that everywhere I read the 03 trannys SUCKS BALLZ! Either way, I'm sure my occasional roasting of the tires doesn't help either

I think it helps a little to remember the main reason the flywheel is there in the first place, to even out torque pulses. However it also has some features that have to do with balancing harmonics along the length of the shaft and in this case the shaft varies in length as the clutch is engaged and disengaged.

While not the case with our engines some are designed without a main bearing at the output of the final drive, relying on the equipment connected to it for support. For example a generator will sometimes carry the load normally associated with this bearing. The flywheel is still present in some cases where the generator is not the starter. If you change the weight in this case of the flywheel you just changed the loading on the bearing away from the ouput of the final drive. If the bearing is present sometimes the generator rotor will hang off of the end of the shaft unsupported by a bearing of its own. A change in weight now will often affect the bearing next to the final drive bearing more than that of the final drive bearing itself.

Sort of hard to explain, but maybe consider that the output bearing like the support of a teeter totter. One end of the teeter totter is where the next bearing is located, the other the input shaft bearing of the transmission. Changing the flywheel characteristics from design will affect everything else. Changing anything else such as aftermarket clutch assemblies, pistons, rods, damper/pulley, will affect everything else as well. Even oil temperatures will play into it.

In the case of large industrial equipment there are ways of tuning these changes. Where shafts bolt together (where bearings are also located) you will often find balance slugs used. Not only for adjusting shaft balance but for harmonics along the shaft. I find the procedure very fascinating to watch, some of the test equipment is simply unbelievable in scope and it takes a very well trained engineer to get it 'right'.

Perry