BMW ECU & Gearbox Remapping in North Somerset & South Wales

MTechTuning specialises in professional ECU and gearbox remapping for BMW vehicles, delivering improved performance, drivability and efficiency while maintaining reliability. We provide a fully mobile BMW tuning service across North Somerset and South Wales, carrying out all work at your home or workplace.


Specialist BMW Tuning Using Dealer-Level Diagnostics


BMW vehicles are engineered with performance in mind, but factory software often limits their full potential. Our BMW ECU and gearbox remaps are carefully calibrated to improve throttle response, torque delivery and overall drivability without compromising long-term reliability.


All BMW tuning work is carried out using dealer-level diagnostics, with full vehicle health checks completed before and after tuning. This ensures all systems are operating correctly and allows us to tailor the software specifically to your vehicle.



BMW ECU & Gearbox Remapping


For the best results, BMW ECU remapping can be paired with gearbox remapping to ensure the engine and transmission work together seamlessly. This can result in smoother gear changes, improved shift behaviour and better use of the increased torque.


BMW Models We Commonly Tune:


• BMW 1 Series, 2 Series, 3 Series and 4 Series 

• BMW 5 Series and 6 Series 

• BMW X Series models 

• BMW M Performance models 

• Petrol and diesel BMW engines

Safe, Reliable BMW Tuning


Reliability is always the priority. All BMW ECU and gearbox software installed by MTechTuning is covered by a lifetime software warranty, and clear advice is provided before any work is carried out.


If you’re looking for professional BMW ECU or gearbox remapping, get in touch to discuss your vehicle and requirements.


We are rated 5 star on Google:

MTech Tuning google profile

Ford Kuga Stage 1 Engine

May 22, 2026
Ford Kuga Stage 1 ECU Remap

BMW 320d Stage 1 Engine & Gearbox tune

May 22, 2026
BMW 320d Stage 1 ECU Remap & Gearbox Tune

BMW X5 40d Stage 1 Engine tune

May 13, 2026
This BMW X5 40d received a custom Stage 1 ECU remap from MTech Tuning Ltd .  Performance Figures Stock Power: 306 hp / 600 Nm Stage 1 Power: 340 hp / 680 Nm Gains: +34 hp / +80 Nm The BMW 40d platform responds extremely well to Stage 1 tuning, delivering noticeably stronger mid-range performance, improved throttle response, and smoother power delivery throughout the rev range. The additional torque improves overall drivability while maintaining the refinement expected from the X5 platform. Optional Software Add-Ons Available add-ons include: Speed limiter removal Dealer-Level Diagnostics Included All tuning work includes advanced dealer-level diagnostics before and after programming to ensure the vehicle is operating correctly throughout the process. Fully Mobile BMW Remapping Service MTech Tuning provides fully mobile ECU remapping across North Somerset & South Wales. We can carry out tuning at your home or workplace with no additional travel charge. Areas covered include: Bristol Weston-super-Mare Cardiff Newport North Somerset South Wales Why Tune a BMW X5 40d? A Stage 1 remap on the BMW X5 40d improves: Mid-range pulling power Overtaking performance Throttle response Overall drivability The factory hardware on the BMW 40d engine comfortably supports Stage 1 power levels, making it one of the most popular BMW diesel engines for tuning. Looking for BMW X5 40d Tuning? Use the Instant BHP Checker at MTech Tuning Ltd to check available tuning options for your vehicle. 0% finance options available.