What are the differences between the Exedy Stage 1 and Stage 2 clutches for a Mazda RX-7 FD?

Here is the breakdown of the differences between the Exedy Stage 1 and Stage 2 clutches based on the available technical data.

Exedy Stage 1 (FD Specific) The Exedy Stage 1 is highly recommended for stock or near-stock FD RX-7s, particularly those retaining the factory twin turbos ⁴. It is known for being very easy to drive with only a slight increase in pedal pressure over OEM, and is proven to reliably handle 320 to 340 horsepower without slipping ¹¹.

For the FD, the Exedy Stage 1 is offered in two distinct versions ⁴:

• Stage 1 Standard (Part Number: 10802): Rated for a torque capacity of 275 ft-lbs.
• Stage 1 Heavy Duty (Part Number: 10802HD): Rated for a torque capacity of 348 ft-lbs.

However, in general rotary applications, the Exedy Stage 2 is designed as a sprung 3-puck cerametallic disc ⁶. It is often utilized for setups under 300 whp because it maintains a stock-like pedal feel while standing up exceptionally well to heavy abuse ⁹.

Higher Horsepower Applications If you are aiming for higher output (e.g., 450–500 horsepower on a single turbo setup), it is generally advised to skip standard single-plate puck clutches. A puck clutch requires aggressive slipping to get the car moving on the street, which burns out the disc quickly. For those power levels, an Exedy Twin Plate clutch is recommended to handle the torque while preserving street driveability ².