R53 MINI Cooper S Reference Manual
Revision 2 · Last updated
Independent reference. Values are approximate and vary by market, model year and source. Verify against factory documentation before performing any work.
Vehicle identification
The R53 is the MINI Cooper S hatchback of the first-generation BMW-era MINI, built from 2002 to 2006. It is the supercharged variant of the R50 range. The R50 range also includes the naturally aspirated One and Cooper hatchbacks, and the R52 covers the convertible.
The Cooper S is identified externally by the raised bonnet scoop, which feeds air to the top-mounted intercooler. The bonnet is a clamshell type: it includes the headlight surrounds and hinges at the front of the car.
| Code | Description |
|---|---|
| R50 | Hatchback, One and Cooper (naturally aspirated) |
| R52 | Convertible |
| R53 | Hatchback, Cooper S (supercharged) |
| W10 | Tritec 1.6 L engine, naturally aspirated |
| W11 | Tritec 1.6 L engine, supercharged (Cooper S) |
| G285 | Getrag six-speed manual gearbox (Cooper S) |
| LCI | Life Cycle Impulse: the mid-2004 facelift |
Model years and the 2004 update
Cars built before mid-2004 are commonly called “pre-LCI” and later cars “LCI” (2005 model year in the US). The update brought revised bumpers, lights and interior details, and raised Cooper S output from 163 PS to 170 PS. Check the change point when ordering exterior, lighting or interior parts.
Vehicles were assembled at the Oxford (Cowley) plant in England. The engine was built by Tritec, a Rover–Chrysler joint venture, at Campo Largo near Curitiba, Brazil.
Specifications
| Item | Value | Notes |
|---|---|---|
| Engine | Tritec W11, 1,598 cc, 4-cylinder | SOHC, 16 valves, chain-driven camshaft |
| Bore × stroke | 77.0 × 85.8 mm | |
| Induction | Eaton M45 supercharger, air-to-air intercooler | Roots type, belt driven. Boost approx. 8–10 psi (0.55–0.7 bar) |
| Power | 163 PS (120 kW) at 6,000 rpm | 2002–mid 2004, Europe |
| 170 PS (125 kW) | From mid 2004, Europe | |
| approx. 161 hp to 168 hp | US ratings, varies by year | |
| Torque | 210 Nm | Early cars, Europe. Later figure varies by source |
| Transmission | Getrag G285, 6-speed manual | Front-wheel drive, transverse engine |
| Front suspension | MacPherson struts, subframe | |
| Rear suspension | Single-sided trailing arm (“Z-axle”) | |
| Steering | Electro-hydraulic power assist (EHPS) | Electric pump feeds a hydraulic rack |
| Wheelbase | 2,467 mm (97.1 in) | |
| Length / width / height | approx. 3.6–3.7 m / 1.69 m / 1.42 m | Varies by market and year |
| Kerb weight | approx. 1,140–1,215 kg | Depends on market, options and source |
| Wheel bolt pattern | 4 × 100 mm | Centre bore 56.1 mm, M12 × 1.5 bolts |
| Performance | 0–60 mph approx. 7 s. Top speed approx. 135 mph | Published figures vary |
All values are approximate and vary by market, model year and source. Confirm critical values against the factory documentation for the vehicle.
Engine and supercharger
The W11 is a 1.6 L four-cylinder with a single overhead camshaft and 16 valves. Timing is by chain. The Eaton M45 supercharger is mounted on the side of the engine and driven by the accessory belt. Compressed air passes through an air-to-air intercooler on top of the engine, under the bonnet scoop.
Supercharger
The blower has its own oil supply, separate from the engine oil. It was not on the factory service schedule, but specialists commonly recommend changing it at roughly 60,000–80,000 miles. The input shaft has a rubber-cushioned coupler. A rattle at idle is a commonly reported sign of wear. A bypass valve allows air to bypass the blower at light load.
Cooling system
The plastic coolant expansion tank and the thermostat housing are commonly reported failure points. Loss of coolant or a failed cooling fan can lead to overheating, which can damage the cylinder head. Inspect these components on any vehicle.
Drivetrain
Drive is to the front wheels through a Getrag G285 six-speed manual gearbox and a single dry-plate clutch with hydraulic release. Other first-generation models used a five-speed manual or a CVT automatic. Clutch life varies widely with use.
Chassis, steering and wheels
Front suspension is by MacPherson struts on a subframe carrying the lower arms and steering rack. The rear uses a single-sided trailing-arm layout, which MINI called the Z-axle.
Power steering is electro-hydraulic. An electric pump replaces the belt-driven pump, which removes the need for a pump belt but makes the pump and its control a service item. Wheels were fitted in 16 and 17-inch sizes depending on year and option pack. Run-flat tyres were an option on many cars.
Common issues and inspection
The following items are commonly reported by owners. They do not mean that any particular vehicle is affected.
| Area | Reported condition | Check |
|---|---|---|
| Cooling | Cracked plastic expansion tank; failed thermostat housing; fan or fan resistor failure | Coolant level and condition, tank for cracks, fan operation |
| Steering | EHPS pump failure or loss of assist | Steering weight, warning light |
| Engine oil | Leaks at crankshaft seal, oil pan gasket and oil filter housing gasket | Underside of engine for oil |
| Timing chain | Tensioner wear | Chain rattle on start-up |
| Supercharger | Coupler wear; overdue supercharger oil service | Rattle at idle; service records |
| Engine mounts | Wear, mainly on early cars | Vibration and clunks |
| Window regulators | Cable-type regulator failure | Operation of both windows |
| Clutch | Wear varies with use | Bite point, slip under load |
Service history is a better guide than mileage. A pre-purchase inspection is recommended.
Glossary
- Bonnet scoop
- Raised scoop on the Cooper S bonnet that feeds the intercooler.
- Clamshell bonnet
- Bonnet that wraps over the wings and includes the headlight surrounds.
- EHPS
- Electro-hydraulic power steering.
- Eaton M45
- Roots-type supercharger fitted to the Cooper S.
- G285
- Getrag six-speed manual gearbox.
- Intercooler
- Air-to-air charge cooler above the engine.
- JCW
- John Cooper Works. Tuning kits for the R53 (approx. 200 PS) and the limited 2006 JCW GP.
- JCW GP
- Limited 2006 R53 with 218 PS, produced in a run of 2,000.
- LCI
- Life Cycle Impulse: BMW's term for a mid-cycle update; here the mid-2004 facelift.
- Tritec
- Rover–Chrysler joint venture that developed and built the 1.6 L engine.
- W10 / W11
- Tritec engine codes: naturally aspirated / supercharged.
- Z-axle
- MINI's name for its rear trailing-arm suspension.