BMW 540i G30/G31 Remapping and Tuning

Upgrade your BMW 540i G30/G31 340HP with professional Stage 1 and Stage 2 ECU tuning from Onyx Performance in Slough, Berkshire. Our performance remapping services are designed to enhance power, torque, throttle response and overall driving performance while maintaining a smooth and enjoyable driving experience.

Powered by BMW’s 3.0-litre B58 turbocharged petrol engine, the 540i combines refined everyday driving with strong performance potential. A professional ECU remap can unlock additional power and torque, delivering sharper acceleration, improved mid-range response and a more engaging driving experience.

BMW 540i Performance Figures

Standard Performance

• Power: 340HP
• Torque: 450Nm

Stage 1 Remap

• Power: 430HP
• Torque: 620Nm
• Price: £599.00

Stage 2 Remap

• Power: 470HP
• Torque: 680Nm
• Price: Call for a Stage 2 quote

All performance figures are indicative and may vary depending on the vehicle’s model year, engine specification, fuel quality, condition and modifications. Results are not guaranteed and should be confirmed against your specific vehicle.

Gearbox Tuning

Enhance your BMW 540i’s transmission performance with professional gearbox tuning. A gearbox remap can improve shift response, optimise gear changes and help the transmission manage increased torque, where supported by the vehicle’s gearbox software.

• Stage 1 Gearbox Remap: Contact for Price
• Stage 2 Gearbox Remap: Contact for Price
• Stage 3 Gearbox Remap: Contact for Price

BEFORE TUNING

Before remapping your BMW 540i, we recommend checking that your vehicle is in good mechanical condition. Any existing engine warning lights, fault codes or running issues should be diagnosed before tuning.

Our team can discuss your vehicle’s condition, intended performance goals and suitability for remapping before work begins. The turbocharging system, cooling system, ignition components and drivetrain should be in suitable condition before increasing engine output.

SERVICING AND MAINTENANCE

Regular servicing is essential for maintaining performance and reliability. We recommend following BMW’s maintenance schedule and ensuring the engine oil, filters, spark plugs, ignition coils and cooling system are in suitable condition before tuning.

Vehicles used for spirited driving or running higher performance levels may require more frequent maintenance. Correct servicing helps support consistent performance and long-term engine health.

EXHAUST UPGRADES

An upgraded exhaust system can complement your BMW 540i’s performance upgrades and enhance its sound and character. Depending on your requirements, available options may include suitable performance exhaust systems and related components.

All exhaust modifications should comply with applicable road-use, emissions and noise regulations.

PERFORMANCE UPGRADES

Support your BMW 540i remap with carefully selected performance modifications. Depending on the desired power level, possible upgrades may include:

• Performance intake systems
• Improved charge-air cooling
• Upgraded intercooler or cooling components, where applicable
• Turbocharger and supporting hardware upgrades for higher power targets
• Spark plugs and ignition servicing appropriate to the tuning specification

Stage 2 tuning requires suitable supporting hardware and a vehicle-specific assessment. Contact Onyx Performance to discuss the parts and setup required for your goals.

STYLING AND BODY UPGRADES

Personalise your BMW 540i with styling enhancements that complement its executive design. Options may include exterior styling components, wheel upgrades and other appearance modifications, subject to vehicle compatibility and availability.

VEHICLE SECURITY

Protect your BMW with suitable vehicle security solutions. We can discuss available security enhancements based on your vehicle, its existing equipment and your requirements.

WHY CHOOSE ONYX PERFORMANCE?

• Professional ECU remapping and performance tuning
• Stage 1 and Stage 2 tuning options
• Vehicle-specific performance advice
• Gearbox tuning options, subject to compatibility
• Performance, exhaust, styling and security solutions
• Based in Slough, Berkshire

Our aim is to help you choose a suitable upgrade for your BMW 540i, with clear advice on expected results, supporting modifications and vehicle suitability.

REMAPPING IN SLOUGH

Onyx Performance provides professional vehicle remapping in Slough, Berkshire. Whether you want stronger everyday acceleration or are planning a more comprehensive performance build, our team can discuss the available options for your BMW 540i G30/G31.

Contact us to confirm compatibility, arrange an assessment and discuss the most suitable remapping package for your vehicle.

Frequently Asked Questions

How much power can a Stage 1 remap add to my BMW 540i?

The indicative Stage 1 figures are up to 430HP and 620Nm, compared with the listed standard output of 340HP and 450Nm. Actual results depend on your vehicle’s specification and condition.

How much power can a Stage 2 remap produce?

The indicative Stage 2 target is 470HP and 680Nm. Stage 2 tuning may require supporting hardware and a vehicle-specific assessment. Contact us for a quote.

Do I need hardware upgrades for Stage 2 tuning?

Stage 2 requirements depend on the chosen calibration and vehicle setup. Supporting modifications may be necessary, so we recommend confirming the required hardware with our team before proceeding.

Can I have the gearbox remapped as well?

Gearbox tuning may be available depending on the transmission and software compatibility. Stage 1, Stage 2 and Stage 3 gearbox options are available by enquiry.

Can I book a dyno session?

Dyno sessions are available for £120.00. Contact us to confirm availability and suitability for your vehicle.

Is Stage 3 tuning available for the BMW 540i?

Stage 3 builds generally require more extensive hardware changes and a bespoke assessment. Contact Onyx Performance to discuss your target power and the modifications required.

Does my BMW need an ECU unlock?

ECU access requirements vary by model year, ECU software version and vehicle configuration. The listed ECU is Bosch MG1CS003, but compatibility and any unlock requirements should be confirmed using your vehicle’s VIN and ECU details before booking.

BOOK YOUR REMAP

Ready to upgrade your BMW 540i G30/G31? Contact Onyx Performance to discuss Stage 1 remapping, Stage 2 tuning, gearbox tuning and supporting performance modifications.

Stage 1 Remap: £599.00
Stage 2 Remap: Call for a quote
Dyno Session: £120.00

Contact Onyx Performance

Transform your BMW 540i G30/G31 today with Onyx Performance. Whether you’re looking for Stage 1 or Stage 2 remapping, performance exhaust systems, styling enhancements, or vehicle security solutions, our expert team is here to help.

📞 Call us now on 01753 439321 to book your tuning service or discuss Stage 2 and security options!