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Mazda RX-7 FD

Are Rotary Works throttle bodies good for the Mazda RX-7 FD?

Updated June 2026

If you are considering an upgrade due to horsepower constraints, the stock FD throttle body is highly capable. It has been proven to comfortably handle around 550 horsepower, and it can support 800+ horsepower on a 13B engine (and over 1000 horsepower on a 20B) when running methanol fuel 1.

This answer was generated by GarageBot's AI from enthusiast forum discussions. Always verify torque specs and safety-critical procedures against the factory service manual before working on your car.

Discussed on the forums

  1. Stock FD throttle body
  2. Rotary performance tuning books
  3. FD3S Urethane Motor Mounts
  4. ITB bore diameter.. how little is too little?

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