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Cooper S 15% supercharger pulley Install Guide

Your Cooper S

Pick your year to see what fits.

This page covers the US Cooper S hardtop.

+8–15 whp (est.)
Expert$180–$1803–4 hrs
All Cooper S mods

Why do it

Spins the supercharger faster for more power.

Tools you'll need

Starting out? See our budget tool list.

Parts to buy

Double-check fitment before buying. We may earn a commission when you buy through these links, at no extra cost to you.

Before you start

  • Run premium fuel after this mod.

Steps

  1. Get access

    • Lift the car and take off the wheel liner.
    Watch this step (Mod MINI, on a 2004 Cooper S) (2:44–5:31)

  2. Support the engine

    • Support the engine and remove the mount.
    Watch this step (6:14–7:37)

  3. Remove the tensioner

    • Take the belt tensioner off.
    Watch this step (7:37–9:44)

  4. Pull the old pulley

    • Use the tool to pull the stock pulley.
    Watch this step (10:26–12:32)

  5. Fit the new pulley

    • Bolt on the new pulley with thread locker.
    Watch this step (13:14–14:38)

  6. Refit the belt and mount

    • Route the belt over the tensioner and lower the engine.
    Watch this step (15:18–18:12)

How to know it worked

Did this guide work for you?

Safety first

  • Park on flat ground, set the parking brake and chock the wheels.
  • Never get under a car held up only by a jack. Use jack stands.
  • Let the engine and exhaust cool first.
  • Disconnect the battery before unplugging electrical parts.
  • Wear safety glasses.
  • If something doesn't match your car, stop and ask a shop.

Follow your part's instructions and your service manual's torque specs.

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