BMW M240i B58 ECU Remap/Tune Software UK – Custom Calibration, Chip Tuning & Dyno Tune – OBD Flash & Bench Unlock – Stage 1 420bhp, Stage 2 440+bhp, Stage 2+ 460+bhp – Performance Map/Reflash by Nforcd

BMW M240i B58 ECU Software Upgrade - Custom Calibration - Dyno Tested - OBD Programming and Bench Unlock

Transform your BMW M240i with a bespoke ECU software upgrade for the legendary B58 engine. This is not a generic file. It is a tailored engine calibration that sharpens throttle response, unlocks serious performance and delivers smooth, repeatable power for fast road or track use. Dyno validated and developed with drivability and safety in mind, it is the go-to performance software if you want a proper power upgrade for your M240i in the UK.

We use this calibration on our own development cars and our customers consistently report a huge step-up in performance with excellent manners around town. If you are searching for BMW M240i ECU software, B58 engine tune, M240i performance map, BMW chip tuning, BMW M240i power upgrade, BMW M240i reflash, or BMW M240i tuning UK, this is exactly what you are looking for.

Power Levels

• Stage 1 - up to 420 bhp - road-focused setup that retains factory refinement while adding serious punch across the rev range.
• Stage 2 - 440+ bhp - for cars with appropriate supporting hardware where required, calibrated for stronger top-end performance.
• Stage 2+ - 460+ bhp - the most aggressive option for maximum gains when paired with suitable modifications.

Why choose this BMW M240i B58 calibration

• Custom engine mapping - a bespoke ECU calibration created specifically for your vehicle after diagnostics and data review.
• Proven on the dyno - before and after power runs available, so you can see the gains clearly.
• Safety first - sensible margins, controlled boost, precise fuel and ignition strategies for reliable power delivery.
• Personalised options - cold start tone reduction or delete, adjustable overrun burbles, GTS-style start-up sound and more on request.
• OBD flashing and bench solutions - OBD port programming where possible, secure bench unlock for later ECUs when required.
• Smooth drivability - refined throttle mapping and gearbox-friendly torque delivery that makes the car faster and easier to drive.
• Trusted by enthusiasts - installed by us on many customer cars with excellent feedback on performance and refinement.

What is included

• Pre-tune health checks and live data logging.
• Fully custom ECU calibration for the BMW M240i B58 engine.
• Dyno validation with printouts available.
• Post-tune support from experienced BMW tuning specialists.
• Optional sound and comfort features integrated into the software as requested.

Installation, dyno and booking

For professional fitting and calibration, book with MJ Modifications in Warwickshire. We serve the West Midlands and wider UK. Request a quote or arrange your session by emailing info@mjmodifications.co.uk.

Frequently asked questions

Is this a bespoke tune?
Yes. Your M240i receives a custom ECU calibration based on diagnostics, logs and your requirements.

Are the gains verified?
Yes. The software is dyno tested and we can provide before and after results.

What if my ECU cannot be flashed via OBD?
We offer secure bench unlock services to enable safe programming on ECUs that are not OBD writable.

Can you tailor sound features?
Yes. Options include cold start reduction or removal, adjustable burble levels and a GTS-style start-up sound.

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Ready to unlock the full potential of your M240i B58 with a safe, powerful and repeatable calibration? Contact info@mjmodifications.co.uk for pricing, availability and bookings.