Nforcd BMW M140i Remap & ECU Tune/Chip Tuning (F20/F21 B58) | Custom Dyno Map UK | Stage 1 420bhp, Stage 2 440bhp+, Stage 2+ 460bhp+ | MG1 DME Unlock & OBD Flash | 1 Series Performance Software

BMW M140i ECU Software Upgrade for F20 and F21 B58

Transform your BMW 1 Series M140i with a bespoke ECU calibration engineered for the 3.0 B58 turbocharged engine. This premium software upgrade delivers harder-hitting torque, razor-sharp throttle response, smoother power delivery and rock-solid reliability. Developed with a leading European calibration team and proven on our hub-mounted rolling road, it is the performance software M140i owners in the UK trust for daily driving and spirited use.

Expect serious real-world gains with supporting hardware and quality fuel: Stage One around 420 bhp, Stage Two 440 bhp plus, Stage 2 Plus 460 bhp plus. Results are verified on our dyno and optimised for safe, repeatable performance.

Why choose this M140i tuning software

• Bespoke ECU calibration built from the ground up for the B58 platform, not a generic file. Tailored ignition, boost, fuelling and torque management for strong mid-range and a clean top end.
• Rolling road validation on a hub dyno with before and after power runs, so you can see the gains on paper and feel them on the road.
• Comprehensive pre-tune checks including baseline power assessment and diagnostics to confirm the car is healthy before any flashing takes place.
• User-configurable features available on request: cold start off, adjustable exhaust overrun burbles, and a sharper GTS-style start-up note.
• Latest ECU solutions including bench unlock for newer MG1 DMEs that cannot be flashed via the OBD port, plus OBD flashing where supported.
• Safety-first strategy with careful control of boost, lambda and knock. Built for reliability on UK roads and track days.

Built for the BMW 1 Series M140i community

Compatible with BMW M140i F20 and F21. Perfect for owners searching for BMW M140i tuning UK, B58 ECU tune, M140i performance software, BMW 1 Series remap, custom map for M140i, F20 F21 engine tune, Warwickshire dyno tuning, and hub dyno BMW tuning.

What you get

• Custom ECU software for the BMW M140i B58 engine
• Baseline rolling road session and health check
• Calibration time on the dyno with live data monitoring
• Post-tune power run and dyno printouts
• Optional cold start removal, burble level adjustment and GTS-style start-up

Real results, happy drivers

We run this calibration on our own cars and customer cars, and the feedback is outstanding. Stronger acceleration, effortless overtakes, and a sharper, more responsive M140i that still behaves perfectly in daily use. This is the M140i software upgrade enthusiasts recommend.

Fitting and installation

Book professional installation and dyno set-up with MJ Modifications in Warwickshire. For a fitting quote or to schedule your session, email info@mjmodifications.co.uk.

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