ACT 07-09 Nissan 350Z / 09-16 Nissan 370Z / 08-13 Infiniti G37 XACT Flywheel Streetlite
ACT 600590 is a one-piece XACT Streetlite flywheel for the manual-transmission Nissan Z and Infiniti coupes and sedans with the later VQ engines: the VQ35HR 350Z built from September 2006, the 370Z, the G37 and the Q60, plus the 2008 G35 sedan. Owners shop for it when the factory dual-mass flywheel starts to rattle or shudder, when the clutch is due and they want one solid flywheel that can be resurfaced at every clutch job, or when they want the VQ to rev more freely.
The flywheel bolts to the crankshaft, carries the starter ring gear and gives the clutch disc its rear friction surface. These cars leave the factory with a dual-mass unit, two masses joined by springs that soak up firing pulses from the V6. Once those springs or bearings wear, the flywheel knocks at idle, shudders on takeoff or wobbles enough to hurt the clutch. A dual-mass flywheel also cannot normally be machined, so it is replaced rather than resurfaced.
The 600590 replaces it with a single forged chromoly steel piece. ACT lists a 250 mm (9.8 in) friction surface, 124 teeth on an induction-hardened ring gear, SFI 1.1 certification and a listed weight of 17.1 lb. Because it is one piece there are no inserts or springs to fail, and ACT says the Streetlite is its most durable flywheel line and is preferred for street and drag use. Expect noticeably quicker engine response and, as ACT notes, OE to mild gear rattle at idle, since the dual-mass damping is gone. Our dual-mass vs. single-mass flywheel guide and lightweight flywheel pros and cons cover that trade-off in more depth.
With the engine idling in neutral, listen near the bellhousing and then press the clutch pedal; a rattle that changes or stops points at the flywheel or release bearing. Once the transmission is out, check the dual-mass unit for free play: excessive rotation between the two halves or rocking means it is worn. Grinding or popping out of gear is usually a gearbox issue instead, covered in our CD009 6-speed problems guide. For total job cost, see 350Z and 370Z clutch replacement cost.
ACT lists 600590 for the 09/2006-2009 Nissan 350Z 3.5L VQ35HR, the 2009-2020 Nissan 370Z 3.7L VQ37VHR, the 2008-2013 Infiniti G37 and 2014-2015 Q60 with the VQ37VHR, and the 2008 Infiniti G35 sedan with the VQ35HR, all with the manual transmission. Our listing title reads 07-09 350Z, 09-16 370Z and 08-13 G37; ACT's chart runs wider, as shown. It does not fit the 2003-2006 350Z or G35 with the earlier VQ35DE. If your 2007 350Z was built before September 2006 or you are unsure which engine you have, check that it is a VQ35HR or send us the year and VIN. More flywheels are in our hard parts category.
| Brand | ACT |
| Part number | 600590 |
| Fits | ACT 07-09 Nissan 350Z / 09-16 Nissan 370Z / 08-13 Infiniti G37 XACT Flywheel Streetlite |
| Vehicle fitment | Nissan 350Z / 09-16 Nissan (2007-2009) |
| Type | Flywheels |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
No. ACT lists it for the VQ35HR 350Z from 09/2006 through 2009, the 370Z, the G37, the Q60 and the 2008 G35 sedan. Earlier VQ35DE cars need a different flywheel.
The factory clutch is matched to the dual-mass flywheel. Plan on a single-mass clutch kit with it; ACT lists its NZ2 kits, such as NZ2-HDSS and NZ2-HDG6, with this flywheel.
ACT describes OE to mild gear rattle. Removing the dual-mass damping usually adds some idle rattle from the gearbox, which is normal and not a fault.
ACT lists 17.1 lb, forged chromoly steel, one-piece, with a 250 mm friction surface and a 124-tooth induction-hardened ring gear. It carries SFI 1.1 certification.
Yes. ACT says XACT flywheels can be machined like a stock flywheel. Remove no more than 0.040 in and keep the correct step height.
