Competition Clutch 07-11 350z/370z / 07-11 G35/G37 17.5lb Steel Flywheel
Competition Clutch 2-630-6ST is a one-piece 17.5 lb steel flywheel for the later VQ cars: the 2007-2008 350Z and G35 with the VQ35HR, the 370Z and the G37 with the VQ37VHR, all with the manual gearbox. Owners look for it when the factory flywheel starts rattling at idle or shuddering on takeoff, when a clutch job is due and they want a flywheel that can be resurfaced next time, or when they want the engine to rev and fall faster between shifts.
The flywheel bolts to the crank, carries the starter ring gear and gives the clutch disc its rear friction face. Its mass also smooths the V6's firing pulses at low speed. These cars leave the factory with a dual-mass flywheel, which uses internal springs to absorb those pulses; once the springs and bearing wear, it knocks, shudders and is normally replaced rather than machined.
The 2-630-6ST swaps that for a single piece of forged 4140 chromoly steel, CNC machined, with no separate ring gear to come loose. At 17.5 lb it is the street version in Competition Clutch's range: the maker says the ST series keeps enough mass to launch smoothly without bogging while still letting the VQ rev freely for rev-matched downshifts. Expect quicker throttle response and some extra gear rattle at idle, since the dual-mass damping is gone. Our dual-mass vs. single-mass guide explains that trade-off.
Listen at the bellhousing at idle, then press the clutch; a noise that stops or changes points at the flywheel or release bearing. With the gearbox out, rock the two halves of the dual-mass unit against each other; excess free play means it is worn out. Our dual-mass flywheel failure guide covers the checks, and if you are chasing slip rather than noise, start with the slipping diagnosis guide. Grinding or popping out of gear is a gearbox issue, covered in our CD009 6-speed problems page.
Competition Clutch lists 2-630-6ST for 2007-2013 model years: the Nissan 350Z and Infiniti G35 with the VQ35HR (2007-2008), the 370Z and the G37 with the VQ37VHR. The maker states it fits the dual-throttle-body VQ35HR and the VQ37VHR only. It does not fit the 2003-2006 350Z or G35 with the VQ35DE, which take the 18.65 lb VQ35DE flywheel instead. Some early 2007 cars still carried the VQ35DE, so confirm your engine code. Our listing names 2007-2011 cars; if your 370Z is 2012 or later, send us the year and VIN before ordering. See more in our hard parts collection.
Budgeting the full job? See 350Z and 370Z clutch replacement cost.
| Brand | Competition Clutch |
| Part number | 2-630-6ST |
| Fits | Competition Clutch 07-11 350z/370z / 07-11 G35/G37 17.5lb Steel Flywheel |
| Vehicle fitment | Nissan 350Z (2007-2011) |
| Type | Flywheels |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
No. It fits the VQ35HR and VQ37VHR cars only. The 2003-2006 350Z and G35 with the VQ35DE need a different flywheel, such as Competition Clutch 2-350Z-ST.
Competition Clutch lists it at 17.50 lb, one-piece 4140 forged chromoly steel.
The factory clutch is built for the dual-mass flywheel. Competition Clutch matches this flywheel with its Gravity, Stage 1 and Stage 2 kits, so plan on a single-mass clutch kit at the same time.
Usually some. Removing the dual-mass flywheel removes its spring damping, so a little more gear rattle at idle is normal with any single-mass flywheel.
Competition Clutch lists 2007-2013 VQ37VHR applications. Our listing is titled through 2011, so send us your year and VIN and we will confirm before shipping.
