Tuning · MINI John Cooper Works Convertible (F57)
JCW Convertible
B48 / B46 (US)
The MINI John Cooper Works Convertible runs the BMW B48 turbo four in a higher factory state of tune than the Cooper S. Hand-calibrated from Stage 1 software through to a turbo build. Choose your package, send your build to Samuel, and get a tune that fits how you actually drive.
Engine
B48 / B46 (US)
Stock
228–231 bhp · 320 Nm
Stage 3 ceiling
231 bhp
About this tune
The F57 JCW Convertible shares the B48 turbo four with the Cooper S but leaves the factory in a stronger state of tune (~228–231 bhp). Stage 1 is software-only; Stage 2 adds an intercooler, sports cat/decat and intake. 99 RON strongly recommended on any aggressive map.
MINI John Cooper Works Convertible tuning
The MINI John Cooper Works Convertible (F57, 2016–2024) runs the B48 / B46 (US) 2.0L turbocharged inline-four (BMW B48 / B46 US-spec) and leaves the factory at 228–231 bhp · 320 Nm, FWD, 8-speed ZF automatic. Samuel tunes the F57 Convertible (JCW) to the same standard — every map hand-calibrated for the specific car, its fuel grade and its installed hardware, not a base file loaded and left. JCW Convertible Stage 1 alone takes it from 228–231 bhp · 320 Nm to 270–290 bhp · 380–420 Nm on the standard turbo, flashed over OBD on BM3, MHD or MG Flasher.
Add the Stage 2 hardware and the JCW Convertible targets 290–310 bhp · 440–470 Nm; from there the B48 / B46 (US) stretches to around 400 bhp on a hybrid or big-turbo build with supporting fuelling. Whichever stage suits the JCW Convertible, the file is delivered within 24 hours and is fully reversible to the supplied stock calibration.
Configurator
Build your JCW Convertible tune
Choose your stage — Stage 1, Stage 2 or Stage 3 — add the options that fit your car, and send the full build to Samuel for a custom remote remap. He'll quote, schedule, and personally calibrate within 24 hours of confirmation.
Add a stage or add-on
£0
Engine guide
MINI John Cooper Works tuning — B48 / B46 stages and hardware (F56 / F57 JCW)
The MINI John Cooper Works runs the same BMW B48 turbo four as the Cooper S, but leaves the factory in a higher state of tune (~228–231 bhp on the F56 hatch and F57 Convertible). The JCW also uses stronger internals than the low-compression Cooper S, so it carries Stage 2 figures more comfortably. MINI JCW tuning with Samuel is about extracting the calibration headroom cleanly across the range, then scaling with hardware where you want more.
Stage 1
270–290 bhp · 380–420 Nm
ECU/DME software only on stock hardware via the OBD port. The JCW responds cleanly to a proper calibration across the rev range. 99 RON strongly recommended.
Every MINI JCW tune is calibrated individually for the specific car, fuel grade and hardware, and reviewed against your data logs before sign-off.
Compatibility
Platform and hardware compatibility
Bootmod3 (BM3)
Full support for the B48 / B46 MINI range (Cooper S and JCW across F54, F55, F56, F57, F60). OBD-port flashing on the MEVD17 / MG1CS003 DME, realtime monitoring via the BM3 app. The most widely used platform for MINI B48 tuning.
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MHD
B48 support suitable for Stage 1 and Stage 2 on the MINI range. Strong data-logging toolset for verifying lambda, ignition correction and intake temperatures after each flash — especially useful for keeping the low-compression Cooper S safe.
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MG Flasher
Full B48 / MINI support on the MG1CS003 DME. Clean interface and a reliable flash process, a common choice for owners who prefer the MG ecosystem.
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xHP Flashtool
For MINIs fitted with the Aisin/ZF automatic. Recommended at Stage 2 where torque climbs, to handle the extra load cleanly. Manual cars do not need xHP.
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ECU: MEVD17 / MG1CS003 DME across MINI B48 production (B46 = US emissions-equivalent code, same engine). Accessible via the OBD port — no bench flash required for Stage 1 or Stage 2.
JCW Convertible specs & stage targets
MINI John Cooper Works Convertible tuning at a glance
- Engine
- B48 / B46 (US) · 2.0L turbocharged inline-four (BMW B48 / B46 US-spec)
- Body styles
- F57 Convertible (JCW)
- Chassis codes
- F57
- Production
- 2016–2024
- Drivetrain
- FWD
- Gearbox
- 8-speed ZF automatic
- Stock output
- 228–231 bhp · 320 Nm
- Tuning ceiling
- ~400 bhp on the right hardware
| Stage | Target |
|---|---|
| Stage 1 | 270–290 bhp · 380–420 Nm |
| Stage 2 | 290–310 bhp · 440–470 Nm |
| Stage 3, Big Turbo / Built Engine | Up to ~380–400+ bhp (larger/hybrid turbo + fuelling) |
FAQ
JCW Convertible tuning — frequently asked questions
JCW Convertible Stage 1 lifts the B48 / B46 (US) from a stock 228–231 bhp · 320 Nm to 270–290 bhp · 380–420 Nm, with no hardware required. The map is flashed through the OBD port on BM3, MHD or MG Flasher and is the starting point for almost every JCW Convertible owner — broader torque and sharper throttle response from the factory hardware.
This page covers the F57 Convertible (JCW) (F57). They share the B48 / B46 (US) 2.0L turbocharged inline-four (BMW B48 / B46 US-spec) and run the same core calibration, but every JCW Convertible tune Samuel delivers is tailored to your exact car, fuel grade and installed hardware — never a base map loaded and left.
Stage 2 on the JCW Convertible targets 290–310 bhp · 440–470 Nm and needs intercooler + decat/sports cat + intake (cooler plugs advised). Everything else — turbo, fuel system, intercooler — holds within the Stage 2 figures on the B48 / B46 (US).
On the right hardware spec the B48 / B46 (US) in the JCW Convertible reaches around 400 bhp. Stage 1 and Stage 2 run the standard turbo; beyond that needs a hybrid or full big-turbo conversion with supporting fuelling, and the calibration is built bespoke per car.
Remotely. Once Samuel has your build details, the calibrated JCW Convertible map is delivered to your flashing tool account (BM3, MHD or MG Flasher) within 24 hours and you flash it yourself over OBD in about 15 minutes. It's fully reversible — the original B48 / B46 (US) stock file is supplied before you flash, so the car can return to factory at any time.
A factory warranty can be voided if BMW shows a tune caused a specific failure, so it's a personal call. Samuel's JCW Convertible maps are calibrated to stay within the mechanical limits of the B48 / B46 (US) hardware, and because the tune is reversible to stock before any dealer visit, many owners run a tuned JCW Convertible without issue.
Keep exploring
Keep exploring JCW Convertible tuning
Other B48 / B46 (US) models we tune: Cooper S 3-door, JCW 3-door, Cooper S 5-door, Cooper S Convertible, Cooper S Clubman, JCW Clubman ALL4.
Engine guide
B48 / B46 (US) tuning
Every B48 / B46 (US) BMW we calibrate, with the full Stage 1, 2 and 3 breakdown for the engine.
Learn moreStages
Stage 1 & Stage 2 explained
What separates Stage 1 from Stage 2 on the JCW Convertible, the real-world gains and the hardware each one needs.
Learn morePricing
How tuning is priced
How the licence, off-the-shelf maps and custom calibration are priced. We quote your exact spec, never a fixed menu.
Learn moreGuide
What is bootmod3?
New to remote flashing? A plain-English explainer on the platform and how a custom map reaches your car.
Learn more