Description
The ACT Mod-Twin 225 HD Rigid Street Clutch Kit is engineered for high-powered street and street/strip applications requiring high torque capacity, smooth engagement, quick shifting, and long-term durability. Designed for BMW 3.0L Turbo B58 applications and 2023-2026 Toyota GR Supra models, this twin-disc clutch combines twice the organic friction surface area with a rigid Mono-Drive hub for efficient and reliable power transfer.
The T1S-B02 Mod-Twin 225 HD Rigid Street Kit delivers a soft, progressive pedal feel with positive engagement and quick shifting. Its rigid Mono-Drive chrome-moly hub is heat-treated for increased strength and durability while using a continuous spline design to help extend input shaft life.
Each diaphragm spring undergoes ACT's exclusive four-stage heat-treatment process for consistent performance. Steel-backed friction plates with high-quality organic friction material provide a stable friction coefficient, excellent heat capacity, and long clutch life.
The kit includes a CNC-machined and dynamically balanced flywheel, pressure plate cover, diaphragm spring, organic friction discs, rigid Mono-Drive hub, floater, patented Monoloc Collar, release bearing, alignment tool, and pilot bearing where required. The modular design is fully rebuildable, with most components available separately.
Key Features
- Twin-disc design with increased friction surface area
- 690 ft-lbs torque capacity
- 44% greater torque capacity than OE
- 225mm / 8.8-inch organic friction discs
- Rigid Mono-Drive chrome-moly hub
- Soft, progressive engagement
- Light pedal effort
- Positive engagement and quick shifting
- Excellent heat capacity and long clutch life
- Four-stage heat-treated diaphragm spring
- CNC-machined, dynamically balanced flywheel
- Fully modular and rebuildable design
- Most components available separately
- 100% clamp-load tested
- Computer balanced for smooth operation
- SFI certified
- Recommended for Street and Street/Strip applications
Specifications
- Brand: ACT
- Part Number: T1S-B02
- Product: Mod-Twin 225 Heavy Duty Rigid Street Clutch Kit
- Clutch Type: Twin Disc
- Disc Material: Organic
- Clutch Disc Diameter: 8.8 inches / 225mm
- Torque Capacity: 690 ft-lbs
- Torque Capacity Over OE: 44%
- Input Shaft Diameter: 1.375 inches
- Pressure Plate Type: Heavy Duty
- Product Weight: 33.1 lbs
- Recommended Use: Street / Street-Strip
What's Included
- CNC-machined and dynamically balanced flywheel
- Pressure plate cover
- Diaphragm spring
- Organic friction discs
- Rigid Mono-Drive chrome-moly hub
- Floater
- Patented Monoloc Collar
- Release bearing
- Alignment tool
- Pilot bearing, if required
Fitment
BMW
- 2016 BMW 340i Base – 3.0L L6 GAS FI 2998cc DOHC
- 2016 BMW 340i xDrive Base – 3.0L L6 GAS FI 2998cc DOHC
- 2017 BMW 340i Base – 3.0L L6 GAS FI 2998cc DOHC
- 2017 BMW 340i xDrive Base – 3.0L L6 GAS FI 2998cc DOHC
- 2017 BMW 440i Base – 3.0L L6 GAS FI 2998cc DOHC
- 2017 BMW M240i Base – 3.0L L6 GAS FI 2998cc DOHC
- 2018 BMW 340i Base – 3.0L L6 GAS FI 2998cc DOHC
- 2018 BMW 340i xDrive Base – 3.0L L6 GAS FI 2998cc DOHC
- 2018 BMW 440i Base – 3.0L L6 GAS FI 2998cc DOHC
- 2018 BMW 440i xDrive Base – 3.0L L6 GAS FI 2998cc DOHC
- 2018 BMW M240i Base – 3.0L L6 GAS FI 2998cc DOHC
- 2019 BMW 440i Base – 3.0L L6 GAS FI 2998cc DOHC
- 2019 BMW 440i xDrive Base – 3.0L L6 GAS FI 2998cc DOHC
- 2019 BMW M240i Base – 3.0L L6 GAS FI 2998cc DOHC
- 2020 BMW M240i Base – 3.0L L6 GAS FI 2998cc DOHC
- 2021 BMW M240i Base – 3.0L L6 GAS FI 2998cc DOHC
Toyota
- 2023 Toyota GR Supra A91-MT Edition – 3.0L L6 GAS FI 2998cc DOHC
- 2023 Toyota GR Supra Base – 3.0L L6 GAS FI 2998cc DOHC
- 2023 Toyota GR Supra Premium – 3.0L L6 GAS FI 2998cc DOHC
- 2023 Toyota GR Supra Special Edition – 3.0L L6 GAS FI 2998cc DOHC
- 2024 Toyota GR Supra 45th Anniversary Edition – 3.0L L6 GAS FI 2998cc DOHC
- 2024 Toyota GR Supra Base – 3.0L L6 GAS FI 2998cc DOHC
- 2024 Toyota GR Supra Premium – 3.0L L6 GAS FI 2998cc DOHC
- 2024 Toyota GR Supra Premium 45th Anniversary Edition – 3.0L L6 GAS FI 2998cc DOHC
- 2024 Toyota GR Supra Special Edition – 3.0L L6 GAS FI 2998cc DOHC
- 2025 Toyota GR Supra Base – 3.0L L6 GAS FI 2998cc DOHC
- 2025 Toyota GR Supra Premium – 3.0L L6 GAS FI 2998cc DOHC
- 2026 Toyota GR Supra A90 Final Edition – 3.0L L6 GAS FI 2998cc DOHC
- 2026 Toyota GR Supra Base – 3.0L L6 GAS FI 2998cc DOHC
- 2026 Toyota GR Supra MkV Final Edition – 3.0L L6 GAS FI 2998cc DOHC
- 2026 Toyota GR Supra Premium – 3.0L L6 GAS FI 2998cc DOHC
Frequently Asked Questions
Are ACT clutches balanced?
Yes. ACT clutch assemblies are computer spin balanced to within 0.25 oz-in, helping provide smooth operation throughout the RPM range.
Will an ACT Heavy Duty clutch increase pedal effort?
ACT Heavy Duty pressure plates can increase pedal effort by approximately 15–40%, depending on the application.
Does the ACT Mod-Twin require a break-in period?
Yes. ACT recommends 300–500 miles of mild driving for organic street discs before racing or aggressive driving. Avoid overheating the clutch during break-in.
Is the ACT Mod-Twin rebuildable?
Yes. The Mod-Twin is fully rebuildable, and most components can be ordered separately. ACT recommends professional inspection and servicing rather than using a general clutch rebuilder.
How much does the ACT Mod-Twin weigh?
The listed product weight is 33.1 lbs. ACT notes that its clutch assemblies will generally weigh around the same as the original OEM clutch assembly.
