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  See more parts for Chrysler Conquest
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ACT HD/Perf Street Sprung Kit Chrysler Conquest | Mitsubishi Starion 1987-1989 - MS1-HDSS

Alright, let’s talk about the ACT Heavy Duty/Performance Street Sprung Kit, specifically the MS1-HDSS. If you're looking to up your clutch game, this is a solid option. This kit packs ACT's Heavy Duty pressure plate, which is known for its durability. The way they’ve designed the diaphragm really cranks up the clamp load while keeping deflection to a minimum—this means you get a longer-lasting clutch that can handle some serious power. Plus, they go through a detailed four-stage heat-treating process to ensure it performs like a champ even under stress.

The Performance Street disc included in this kit is no slouch either. Made with a high copper content organic material, it’s built for better heat management and has a steel-backed lining for extra durability. You’ll notice the reduced marcel helps with quicker shifts, making your driving experience a lot more enjoyable. It’s all about that smooth engagement and reliable performance, whether you're cruising the streets or hitting the track.

Installation:

Key Features:

  • Light to moderate pedal feel—perfect for daily driving with a touch of performance.
  • Designed for longevity, thanks to that clever diaphragm engineering.
  • Made from premium organic materials, so it can take the heat and resist fading.
  • Great for both street and track use—this clutch doesn’t shy away from a challenge.
  • Every unit is clamp load tested and computer balanced for smooth operation at high RPMs.

Specifications:

  • Clutch Master Cylinder: Not included
  • Grease: Yes, it comes with some
  • Type: Performance
  • Pilot Bushing: Not included
  • Pressure Plate: Heavy Duty
  • Release Bearing: Yes, included
  • Clutch Disc Diameter: 9.4 inches (240 mm)
  • Disc Material: Organic
  • Input Spline Quantity: 23
  • Input Shaft Diameter: 1 inch
  • Alignment Tool: Yes, included
  • Disc Type: Sprung Solid
  • Pressure Plate Bolts: Not included
  • Clutch Slave Cylinder: Not included
  • Flywheel Bolts: Not included
  • Pilot Bearing: Yes, included
  • Weight: 15.9 lbs
  • Torque Capacity: 330 ft/lbs
  • Torque Capacity Over OE: 0.34

Fitment:

This kit fits the following models:

  • Chrysler Conquest (1987-1989)
  • Mitsubishi Starion (1987-1989)

If you’re serious about your ride and want a clutch that can keep up with your driving style, the ACT MS1-HDSS is worth considering. It’s built for enthusiasts who don’t want to compromise on performance or reliability.

Other Part Numbers:
ACT #actMS1-HDSS

Proposition 65

⚠ WARNING: Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

Vehicle
1987-1989
 Chrysler Conquest
1987-1989
 Mitsubishi Starion

ACT Banner

ACT ? Advanced Clutch Technology | Clutch Kits & Flywheels Built to Handle Real Power

If you've added boost, tuned for more power, or simply want better throttle control, then your stock clutch won't cut it. That?s where ACT (Advanced Clutch Technology) comes in delivering high-performance clutch kits and flywheels designed for real drivers who push their builds on the street, strip, or track.

ACT?s lineup includes everything from daily driver friendly HD kits to hardcore twin disc setups for serious horsepower. Whether you?re launching hard in a WRX, drifting in a 370Z, or canyon carving in an M3, ACT gives you the torque capacity and engagement you need without sacrificing drivability.

Why ACT? Because Power Without Control Is Useless.
  • Hold More Power Engineered to handle turbo, supercharger, and high-compression builds
  • Faster Engagement Stronger pressure plates for better bite off the line
  • Better Pedal Feel Balanced response without going full race-car stiff
  • Reduced Rotational Mass Lightweight flywheels improve rev-matching and response
  • No Guesswork Direct-fit applications, no fabbing, no hassle
ACT Clutch Kits and Flywheels Fit the Cars Enthusiasts Build

ACT doesn?t just make universal performance parts ? they build complete, vehicle-specific clutch solutions for enthusiast favorites. Whether you daily a Civic Type R, track a Subaru STI, drift a 240SX, or drag a Mustang GT, ACT offers the right clutch to match your build goals.

Top supported platforms include the Nissan 350Z/370Z, Toyota Supra A90, Chevy Camaro SS/ZL1, Mitsubishi Evo, Ford Focus RS/ST, and BMW M3/M4 ? each with clutch options tuned to your driving needs.

What ACT Offers:
  • Performance Clutch Kits From HD street kits to twin-disc race systems
  • Clutch Discs 6-puck, full-face, rigid or sprung to match your style
  • Pressure Plates Heavy-duty options that increase clamp load without sacrificing control
  • Chromoly Lightweight Flywheels Quicker revs, smoother shifts, and less drivetrain stress
  • Complete Hardware Kits Everything you need for a proper install
Performance Tested. Driver Approved.

ACT isn?t hype ? it?s proven. Their clutches are SFI-certified, track-tested, and used by racers in drag, time attack, autocross, drift, and rally. But what really matters? They hold power, last longer, and feel right even after hundreds of hard launches or hours of canyon carving.

Whether you're upgrading for more power or replacing a tired OEM clutch, ACT gives you the bite, strength, and feel to drive harder with confidence. No compromises, no excuses just parts that work when it matters.

ACT warrants all products to be free of defects in materials and workmanship for normal use and service for a period of one (1) year from retail purchase. Written notice must be immediately given to ACT within the warranty period. We require a copy of the purchase receipt showing the unit was purchased from an Authorized Dealer or Advanced Clutch Technology directly to verify the product is under warranty. Products purchased used do not carry a warranty. This warranty is to the original purchaser and is non-transferable. All non-warranty items are subject to a $50 inspection bench test fee.

ACT reserves the right to examine any part returned for warranty claim to determine, to ACT's satisfaction, whether the material or workmanship of the part does not conform to this limited warranty. ACT's obligation under this warranty shall be limited to repairing, replacing, or crediting, at its option, any part which is deemed covered by ACT. No labor, lift or storage charges will be reimbursed for any reason. Damage to ACT's parts resulting from misuse, improper use, or abuse shall void this limited warranty. Failure to follow ACT's installation instructions and the vehicle manufacturers installation procedures and specifications shall void this limited warranty.

ACT undertakes no responsibility for the quality of the goods except as otherwise provided in this contract. ACT assumes no responsibility that the goods will be fit for any particular purpose for which you may be buying these goods, except as otherwise provided in the contract. ACT shall not be liable for any damage or injury to persons or property resulting from improper installation or misuse of any part subject to this warranty.

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