We recently carried out a bespoke Stage 1 ECU calibration on this BMW Z4 20i, unlocking significant additional performance from BMW's turbocharged 2.0 litre B48 petrol engine while retaining the smooth drivability, refinement and balance that make the Z4 such an enjoyable roadster both on the daily commute and on spirited drives.

The Stage 1 calibration transforms the character of the vehicle, delivering stronger acceleration, improved responsiveness and a noticeably more engaging driving experience without compromising reliability or everyday usability.

Performance Figures

Stock: 184 hp / 270 Nm

Stage 1: 260 hp / 420 Nm

Increase: +76 hp / +150 Nm

The Stage 1 ECU calibration delivers a substantial increase in both power and torque throughout the rev range, with significantly stronger mid-range performance, sharper throttle response and much improved acceleration.

The additional torque allows the vehicle to pull harder from lower RPM, providing a more urgent and responsive feel while improving flexibility in every gear. The result is a BMW Z4 that feels considerably faster and more capable, while still retaining the refinement expected from a modern BMW sports car.



Unlike generic tuning files, our calibrations are developed to provide strong, usable performance while remaining within the safe operating limits of the engine and drivetrain.

Additional Software Options Included

As part of this vehicle's setup, we also carried out:

• Speed Limiter Removal

Dealer-Level Diagnostics Included

Every tuning appointment includes advanced dealer-level diagnostics before and after the calibration process.

This allows us to identify any underlying issues that could affect performance and confirms the vehicle is operating correctly once the software installation is complete.

Frequently Asked Questions

How much power does a BMW Z4 20i Stage 1 remap produce?

Our Stage 1 ECU calibration increases output from 184 hp and 270 Nm to approximately 260 hp and 420 Nm, representing gains of 76 hp and 150 Nm over standard.

Is the BMW Z4 20i engine suitable for Stage 1 tuning?

Yes. BMW's B48 2.0 litre turbocharged petrol engine responds exceptionally well to Stage 1 tuning and offers substantial gains while remaining within safe operating limits when calibrated correctly.

Does Stage 1 tuning improve drivability?

Absolutely. Alongside the increase in peak power, customers typically notice improved throttle response, stronger mid-range torque and more effortless acceleration during everyday driving and overtaking situations.

Do you offer mobile BMW tuning?

Yes. MTech Tuning provides a fully mobile ECU tuning service, travelling directly to your home or workplace at no additional cost.

Fully Mobile BMW Tuning

At MTech Tuning, we provide a fully mobile service, travelling directly to your home or workplace free of charge.

There is no need to visit a tuning centre or leave your vehicle for the day. We bring professional ECU tuning and dealer-level diagnostics directly to you.

We regularly cover Somerset and surrounding areas, providing mobile ECU remapping and performance software solutions for BMW, Audi, Volkswagen, Mercedes-Benz and many other manufacturers.

0% Finance Available

We understand that vehicle modifications can be a significant investment, which is why we offer flexible payment options, including 0% finance on eligible purchases.

Instant BHP Checker

Curious what your vehicle is capable of?

Visit our website and use the Instant BHP Checker to view estimated performance gains for your car, or get in touch to discuss the best tuning options available.

BMW Z4 20i Stage 1 Remap • BMW Z4 ECU Tuning • BMW Z4 Performance Upgrade • BMW B48 Stage 1 • Mobile BMW Remapping • Dealer-Level Diagnostics • Somerset

MTech Tuning – Professional Mobile ECU & Gearbox Tuning