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Clutch, Flywheel, Hydraulics Tech

3 posts in this topic

Posted · Report post

I was asked to do a post on some technical aspects of the 350Z clutch systems so I will try to help you guys out here a little and put out some info on commonly asked questions and hopefully answer some of your quesitons.

Some of this is basic stuff and I will shed some light on more complex areas of these systems.


I will be adding to this as my time allows.


Hopefully this will shed some light on the areas of clutch replacement, Common problems, Popular upgrades (at least here in the states) and the differences among brands


03-06 350Z/G35 Sedans, Coupes 2003-2007 VQ35DE clutch/flywheel systems.


Factory Set-up

Clutch, 240-250MM Disk (depending on year)  Self adjusting pressure plates came in some 05 and all 06 cars.


Exedy stock replacement clutch kit  (stock clutch looks almost identical)

Picture shows NON-self adjusting style pressure plate.




Dual Mass Flywheel 28-30lbs

Dual mass flywheels were introduced in recent years to reduce driveline noise as engine compression ratios became higher. The engine firing pulses can cause trans rattle and by using sprung, dual mass flywheel it absorbs these noises and harmonics into the driveline. This noise is commonly called "Chatter" when going to a single mass replacement flywheel. It's actually not "Chatter" Clutch chatter is what happens when going to a more aggrssive clutch material (more on this later)


VQ35DE Dual Mass OEM Flywheel, Common to wear out and cause noise and drivetrain shudder. Not resurfacable and recommended by Nissan to be replaced when clutch is changed, Very expensive to buy new.





2003 and some early 04 cars have a stamped steel clutch release fork and long pivot ball.


Long Pivot


later 04 and up to 2006 cars came with the cast iron clutch release fork and short pivot ball.


Short Pivot




Weak link

Stock 03 clutch fork


The stock fork in the 2003 and early 2004 cars was a stamped steel fork, These are pretty weak and cause poor release of the clutch esp with an aftermarket clutch kit, This is one of the main reasons for early gear box failure and grinding issues in the transmission


Stamped Steel Clutch Fork


The 04-06 cars have a Cast Iron clutch release fork, This was introduced early in 2004 and normally come with any new repeacement trans from Nissan.


Cast Iron Clutch Fork


Complete Upgrade kits are available with Cast iron fork, Chromoly Pivot Ball and related parts to upgrade the early cars.

You need the Fork, Short pivot ball, both attachment springs, the original dust boot can be reused if your is in good shape by cutting the tab off where the fork slides though or can be replaced with the newer style (pretty cheap)




03-06 Use and external clutch release slave cylinder


03-06 350Z Clutch slave cylinder (also used in the G35 up to 2007 in the coupe models)




More coming soon!

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Posted · Report post

I'll be keeping an eye here fo sure, good tech.



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Posted · Report post

What about the 07+ Zs?


Would like to know about them too. Thanks.

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