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Twin-Disc Holding Power With Street-Friendly Pedal Feel
The ACT T1SS-N04 Mod-Twin 225 HD Sprung Street clutch kit is built for RB26DETT-powered R34 GT-R owners who need serious torque capacity without giving up daily-driver manners. The T1SS-N04 doubles the organic friction surface area versus a single-disc setup, so it can handle high-power AWD applications while keeping pedal effort manageable. An exclusive four-stage heat-treating process on each diaphragm spring keeps the T1SS-N04 engagement consistent even after repeated hard use, and the sprung-hub Mono-Drive design absorbs drivetrain shock that would otherwise stress the transmission and driveline. Every T1SS-N04 kit ships with a chromoly XACT Streetlite flywheel, so the whole clutch system is matched and ready to install as one unit rather than piecing together separate components.
Key Features
- T1SS-N04 uses a 225mm Mod-Twin pull-type design rated up to 875 ft-lb of torque capacity
- Doubled organic friction surface area compared to a single-disc clutch for high-power AWD use
- Four-stage heat-treated diaphragm springs for consistent, repeatable engagement
- Sprung Mono-Drive hub absorbs drivetrain shock and reduces chatter
- Includes a chromoly XACT Streetlite flywheel matched to the T1SS-N04 kit
- Maintains factory clutch stack height for a bolt-in installation
Fitment
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 1999-2002 | Nissan | Skyline GT-R | R34 |
Specifications
| Detail | Value |
|---|---|
| MPN | T1SS-N04 |
| Clutch Diameter | 225mm |
| Design | Mod-Twin pull-type, sprung disc |
| Torque Capacity | Up to 875 ft-lb |
| Hub Type | Sprung Mono-Drive |
| Flywheel Included | Chromoly XACT Streetlite |
| Engine Application | 2.6L Twin Turbo RB26DETT |
| Transmission | 6-speed manual |
What's Included
- 1x T1SS-N04 Mod-Twin 225 HD Sprung Street clutch disc set and pressure plate assembly
- 1x Chromoly XACT Streetlite flywheel
- Clutch hardware, release bearing, pilot bearing, and alignment tool
About ACT
Advanced Clutch Technology (ACT) engineers clutch and flywheel systems for street, sport, and race applications, with the T1SS-N04 representing its Mod-Twin street-focused line for high-output turbocharged platforms like the R34 GT-R. ACT's heat-treating and friction material processes are designed to hold up to repeated hard launches while keeping the clutch pedal predictable for everyday driving.
Related Parts
- ACT 07-11 Mazdaspeed 3 Performance Street Sprung Disc
- ACT 2006 Mazda 6 Perf Street Sprung Disc
FAQ
What is the T1SS-N04?The T1SS-N04 is an ACT Mod-Twin 225 HD Sprung Street clutch kit built for the 1999-2002 Nissan Skyline GT-R (R34) with the RB26DETT engine, rated up to 875 ft-lb of torque capacity and including a matched chromoly flywheel.
Does the T1SS-N04 include a flywheel?Yes, the T1SS-N04 kit includes a chromoly XACT Streetlite flywheel along with the clutch hardware, release bearing, pilot bearing, and alignment tool needed for installation.
Is the T1SS-N04 suitable for daily driving?The T1SS-N04 is part of ACT's Sprung Street line, engineered to maintain manageable pedal effort and smooth engagement for street use while still supporting high-torque AWD applications.
What torque capacity does the T1SS-N04 support?The T1SS-N04 Mod-Twin 225 design is rated to handle up to 875 ft-lb of torque, making it suitable for built RB26DETT engines with meaningful power increases over stock.
Does the T1SS-N04 maintain factory clutch pedal feel?The T1SS-N04 uses a sprung Mono-Drive hub and four-stage heat-treated diaphragm springs, which is designed to keep pedal effort consistent and predictable compared to a rigid race disc.
What is the difference between the T1SS-N04 and a single-disc clutch?The T1SS-N04 uses two friction discs instead of one, doubling the available friction surface area, which allows it to handle significantly more torque than a comparable single-disc clutch without increasing pedal effort as much.
Does the T1SS-N04 fit a 6-speed R34 GT-R transmission?Yes, the T1SS-N04 is designed to bolt in to the factory 6-speed manual transmission used in the 1999-2002 Nissan Skyline GT-R (R34).
Will the T1SS-N04 fit an R33 or R32 GT-R?No, the T1SS-N04 is engineered specifically for the R34 GT-R platform and its factory bellhousing and flywheel bolt pattern; it is not listed as a direct fit for R32 or R33 chassis.
Install Instructions
- Remove the transmission from the vehicle following the factory service procedure for the R34 GT-R.
- Remove the factory flywheel, pressure plate, and clutch disc from the crankshaft flange.
- Install the T1SS-N04 chromoly XACT Streetlite flywheel and torque the mounting bolts to factory specifications.
- Center the T1SS-N04 clutch disc using the supplied alignment tool, then bolt on the pressure plate assembly.
- Install the new pilot bearing and release bearing included with the T1SS-N04 kit.
- Reinstall the transmission, reconnect the hydraulic clutch line, and bleed the clutch system before test driving.
Prop 65 Warning
This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
ACT
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