ACT 2015 Nissan 370Z HD/Perf Street Sprung Clutch Kit

The ACT NZ2-HDSS is the street clutch most 370Z owners end up buying when the factory clutch starts slipping in the upper gears or the car has picked up an intake, exhaust and tune. It combines ACT's Heavy Duty pressure plate with the sprung organic Performance Street disc, so it holds noticeably more than stock while keeping a pedal and engagement you can live with in traffic. This listing is for the 2015 Nissan 370Z with the VQ37VHR and six-speed manual.

What this clutch kit does in a 370Z

The pressure plate clamps the friction disc against the flywheel so the VQ37VHR's torque reaches the transmission input shaft. ACT's Heavy Duty plate uses its own diaphragm design to raise clamp load and reduce deflection, without the big jump in pedal effort that comes with the Xtreme plate. The disc is a 250 mm (9.8 in) full-face organic lining with high copper content and steel backing, mounted on a sprung hub that soaks up driveline shock on takeoff and during shifts. ACT rates the complete kit at 448 ft-lb, 56 percent over the factory clutch, which is comfortable headroom for a naturally aspirated 370Z with bolt-ons and a reasonable margin for mild boost.

Symptoms that point to a new clutch

• RPM climbs faster than road speed in fourth, fifth or sixth at wide-open throttle
• Burning friction smell after a hill start, track session or a few hard pulls
• Engagement point creeping higher in the pedal travel as the disc wears thin
• Chatter or shudder when pulling away from a stop
• Noise that changes when the pedal is pressed, which usually points at the release bearing or pilot bushing
• Hard shifts or grinding into gears with the pedal on the floor, often a hydraulic release problem rather than a worn disc

How to confirm before you buy

Warm the car up, put it in fourth around 2,500 rpm and roll into full throttle. If the tach jumps ahead of the speedometer, the disc is slipping. If the pedal feels spongy, sinks or does not fully disengage, bleed the clutch hydraulics and check the slave and master cylinders first, because a new clutch will not fix a release problem. Our slipping diagnosis guide covers the load test step by step, and the flare vs. slip guide explains how to tell a true slip from RPM hang between shifts.

Fitment

The listing is for the 2015 Nissan 370Z. ACT's application list for NZ2-HDSS covers more cars on the same VQ HR clutch: 2009-2020 370Z (VQ37VHR), 09/2006-2009 350Z with the VQ35HR, the 2008 Infiniti G35 sedan, 2008-2013 G37 and 2014-2015 Q60. Earlier VQ35DE 350Z and G35 coupes use a different kit, and the 370Z with the seven-speed automatic does not apply. The disc takes a 1 in input shaft. If your car has had a flywheel or transmission swap, compare the old parts or send us your year and VIN before ordering.

Install notes

• Kit contents per ACT: N024 Heavy Duty pressure plate, 3000409 Performance Street sprung disc, AT01 alignment tool and PB1012 pilot bushing. A release bearing is not included, so inspect or replace the release assembly while the transmission is out.
• Resurface the factory flywheel to a clean, flat face, or fit the ACT 600590 Streetlite flywheel that ACT lists as the matching option for this kit.
• Press in the new pilot bushing, center the disc with the alignment tool and draw the pressure plate bolts down evenly in a star pattern to the Nissan torque specification.
• The clutch hydraulics share the brake fluid reservoir. Bleed with fresh fluid of the grade marked on the cap until the pedal is firm and consistent.
• ACT says Heavy Duty plates raise pedal effort roughly 15 to 40 percent. If you are making far more power, step up to the NZ2-XTSS Xtreme street kit.
• Break in the organic disc for 300 to 500 miles of gentle engagement before launches or track days.

Does the NZ2-HDSS come with a release bearing?

No. ACT lists the kit as the N024 Heavy Duty pressure plate, 3000409 sprung street disc, AT01 alignment tool and PB1012 pilot bushing. Replace or inspect the release bearing separately while the transmission is out.

How much torque will it hold?

ACT rates the NZ2-HDSS at 448 ft-lb measured at the crank, 56 percent more than the factory 370Z clutch.

Will it fit my 350Z or G37?

ACT lists it for 09/2006-2009 350Z with the VQ35HR, 2009-2020 370Z, the 2008 G35 sedan, 2008-2013 G37 and 2014-2015 Q60. Earlier VQ35DE cars need a different kit. Send us your year and VIN if you are unsure.

How heavy is the pedal compared to stock?

ACT says its Heavy Duty pressure plates increase pedal effort by roughly 15 to 40 percent depending on the car, with smooth, positive engagement.

Should I replace the flywheel at the same time?

At minimum have the factory flywheel resurfaced. Many owners fit the ACT 600590 Streetlite flywheel during the same job since the transmission is already out.

Is there a break-in period?

Yes. ACT recommends 300 to 500 miles of mild stop-and-go driving with an organic street disc before racing or spirited driving, and warns against overheating the clutch during break-in.

• How to Diagnose Transmission Slipping
• Shift Flare vs. Slip: How to Tell Them Apart
• Automatic vs. Manual Transmission Repair Cost