BMW 840i G14/G15/G16 Remapping and Tuning
The BMW 840i G14/G15/G16 combines BMW’s 3.0-litre B58 turbocharged petrol engine with luxury, refinement and impressive performance. Producing a factory output of 340 BHP and 500 Nm of torque, the 840i delivers an excellent balance of performance and comfort, but ECU remapping can unlock even more power, torque and responsiveness.
At Onyx Performance, we offer professional BMW 840i remapping and tuning designed to improve your vehicle’s performance while maintaining smooth and predictable power delivery. Our tuning options include Stage 1 remapping, Stage 2 tuning and supporting performance upgrades.
Whether you want stronger acceleration, sharper throttle response or improved in-gear performance, we can help you get more from your BMW 840i G14/G15/G16.
BMW 840i G14/G15/G16 Stage 1 Remap
Our Stage 1 ECU remap is designed to optimise the factory engine management software without requiring additional performance hardware modifications.
The 3.0 B58 turbocharged engine responds well to software optimisation, with our Stage 1 tuning package targeting approximately 430 BHP and 620 Nm of torque, depending on vehicle condition and setup.
Stage 1 Remapping Benefits:
- Increased horsepower: Improve engine output from the factory 340 BHP to approximately 430 BHP.
- Increased torque: Raise torque from 500 Nm to approximately 620 Nm for stronger pulling power.
- Improved throttle response: Enjoy sharper and more immediate acceleration response.
- Stronger acceleration: Experience improved performance throughout the rev range.
- Improved in-gear performance: Benefit from stronger mid-range power when overtaking.
- Smoother power delivery: Enjoy a more responsive and refined driving experience.
Our Stage 1 remap is developed around the original engine hardware, making it a suitable option for drivers looking for additional performance without requiring supporting hardware modifications.
BMW 840i G14/G15/G16 Stage 2 Tuning
For owners looking for further performance, Stage 2 tuning can provide additional power when combined with suitable supporting modifications.
With the right hardware and a correctly configured ECU calibration, the BMW 840i G14/G15/G16 can achieve outputs of up to approximately 470 BHP and 680 Nm of torque.
Stage 2 supporting modifications may include:
- Performance downpipe: Improve exhaust gas flow with a suitable performance exhaust component.
- Performance intake system: Support improved airflow into the engine.
- Upgraded intercooler: Help manage intake temperatures under increased performance demands.
- Performance exhaust system: Improve exhaust flow and tailor the vehicle’s sound.
- Custom ECU calibration: Optimise engine management software around the installed hardware.
The exact modifications required depend on the vehicle’s existing specification, condition and performance targets. All exhaust and emissions-related modifications must comply with applicable road-use and emissions requirements.
Call for a Stage 2 quote. Final performance figures depend on supporting modifications, vehicle condition and setup.
BMW 840i G14/G15/G16 Gearbox Tuning
Gearbox tuning can complement an engine remap by optimising transmission behaviour and shift characteristics where supported.
Our gearbox tuning options may help deliver:
- Improved gearshift response
- Faster gear changes where supported
- Optimised shift behaviour
- Improved transmission response under acceleration
- Better coordination between engine and gearbox performance
The exact gearbox and control unit compatibility must be confirmed against your BMW 840i’s specification before any gearbox calibration is carried out.
Before Tuning
Before carrying out a remap on your BMW 840i G14/G15/G16, we recommend checking the vehicle’s mechanical condition to ensure it is suitable for increased performance.
Our pre-tuning checks may include:
- Engine diagnostics: Check for stored fault codes and existing engine issues.
- Spark plugs and ignition system: Check ignition components are in suitable condition.
- Turbocharger and boost system: Inspect boost performance and check for leaks.
- Air intake system: Check airflow and intake components.
- Fuel system: Check fuel delivery and relevant components.
- Cooling system: Check coolant condition and engine temperature management.
- Engine condition: Assess the general mechanical condition of the engine.
- ECU identification: Confirm the ECU specification before tuning.
Carrying out these checks helps identify existing issues that could affect the tuning process or the vehicle’s reliability.
Servicing and Maintenance for BMW 840i G14/G15/G16
Regular servicing is important for maintaining the performance and reliability of your BMW 840i, particularly when the vehicle is being used with increased engine output.
We can help with maintenance and servicing requirements, including:
- Engine oil and filter: Regular oil and filter changes using suitable specifications.
- Spark plugs: Inspection and replacement when required.
- Ignition components: Checks to help maintain consistent engine performance.
- Air filters: Inspection and replacement where necessary.
- Cooling system: Checks of coolant condition and cooling performance.
- Engine diagnostics: Identify potential faults and warning lights.
- General vehicle inspection: Assess relevant components before performance work.
Maintaining your BMW correctly helps support reliable performance and allows potential issues to be identified before they become more serious.
BMW 840i G14/G15/G16 Exhaust Upgrades
An upgraded exhaust system can complement your BMW 840i’s B58 engine while changing its sound and exhaust flow.
Available exhaust upgrade options may include:
- Performance exhaust systems: Enhance the vehicle’s exhaust note.
- Sports exhaust components: Give the 840i a more distinctive sound.
- Performance downpipes: Support increased exhaust flow as part of a suitable Stage 2 setup.
- Exhaust system upgrades: Choose components that suit your performance and sound preferences.
We can discuss suitable exhaust options based on your vehicle’s specification and intended use. All exhaust modifications must meet applicable road-use, emissions and noise requirements.
BMW 840i G14/G15/G16 Performance Upgrades
Alongside ECU remapping, we can help you explore supporting performance upgrades for your BMW 840i.
Available options may include:
- Performance air intake systems: Support improved engine airflow.
- Upgraded intercoolers: Help manage intake temperatures.
- Performance exhaust systems: Improve exhaust flow and sound.
- Turbocharger upgrades: Support higher performance targets where suitable.
- Brake upgrades: Improve braking capability to complement increased performance.
- Suspension upgrades: Enhance handling and driving characteristics.
Combining suitable performance hardware with professional ECU tuning can help your BMW 840i achieve a stronger and more complete performance setup.
BMW 840i G14/G15/G16 Styling and Body Upgrades
Give your BMW 840i a more individual appearance with styling enhancements designed to complement its elegant and sporty grand touring design.
Styling options may include:
- Front splitters: Add a more aggressive look to the front end.
- Rear spoilers: Enhance the rear styling.
- Side skirts: Create a more distinctive side profile.
- Diffusers: Give the rear of the vehicle a sportier appearance.
- Exterior styling upgrades: Personalise the overall appearance of your 840i.
We can help you explore suitable styling options to match your preferred look.
BMW 840i G14/G15/G16 Vehicle Security
Protect your BMW 840i with additional vehicle security solutions from Onyx Performance.
We offer security options designed to help protect your vehicle, including:
- Ghost immobilisers: An additional layer of immobilisation security.
- Advanced immobilisers: Help prevent unauthorised vehicle use.
- Vehicle tracking systems: Support vehicle location and recovery.
- Security upgrades: Solutions selected around your vehicle and requirements.
Our team can discuss suitable security options for your BMW 840i and help you choose a setup that meets your needs.
Why Choose Onyx Performance?
At Onyx Performance, we provide professional vehicle tuning and upgrade services designed around your vehicle and performance requirements.
Our services include:
- Stage 1 ECU remapping: Software optimisation for improved power and torque.
- Stage 2 tuning: Performance tuning with suitable supporting modifications.
- Gearbox tuning: Transmission calibration where supported.
- Diagnostics: Vehicle checks and fault identification.
- Servicing and maintenance: Support to help maintain your vehicle.
- Performance exhausts: Exhaust upgrades to complement your setup.
- Performance parts: Supporting hardware and performance enhancements.
- Styling upgrades: Exterior modifications to personalise your vehicle.
- Vehicle security: Immobilisers, tracking and additional security solutions.
Whether you are looking for a Stage 1 remap, a complete Stage 2 setup or additional performance and styling upgrades, Onyx Performance can help you get more from your BMW 840i.
BMW 840i G14/G15/G16 Remapping in Slough
Onyx Performance provides BMW remapping and tuning services in Slough, Berkshire, helping drivers improve their vehicle’s performance with professional ECU calibration and supporting upgrades.
Our BMW 840i G14/G15/G16 Stage 1 remap is designed to increase power from the standard 340 BHP to approximately 430 BHP, with torque increasing from 500 Nm to approximately 620 Nm.
We can also discuss Stage 2 tuning, gearbox calibration, exhaust upgrades, intake systems, intercoolers, performance parts and vehicle security.
Contact Onyx Performance to discuss your BMW 840i G14/G15/G16 remapping and performance upgrades.
Frequently Asked Questions
How much power can a BMW 840i G14/G15/G16 gain from a Stage 1 remap?
The BMW 840i G14/G15/G16 produces 340 BHP and 500 Nm as standard. Our Stage 1 remap targets approximately 430 BHP and 620 Nm, depending on vehicle condition and setup.
Can my BMW 840i G14/G15/G16 have Stage 2 tuning?
Yes. Stage 2 tuning is available with suitable supporting hardware and can achieve outputs of up to approximately 470 BHP and 680 Nm, depending on the modifications and vehicle setup.
Does a Stage 1 remap require additional modifications?
No. Stage 1 tuning is designed around the original engine hardware and does not normally require additional performance modifications.
Can the gearbox also be tuned?
Gearbox tuning may be available where the fitted transmission and control unit are supported. Compatibility must be confirmed against your vehicle’s exact specification.
Will my vehicle be checked before remapping?
Yes. We recommend diagnostic and mechanical checks before tuning to identify existing faults and assess the vehicle’s condition.
Can I upgrade the exhaust system?
Yes. We can discuss suitable performance exhaust systems and supporting components for your BMW 840i, subject to road-use, emissions and noise requirements.
Can Onyx Performance supply performance and styling upgrades?
Yes. We can help with suitable intakes, intercoolers, exhausts, brakes, suspension components, exterior styling and vehicle security solutions.
What is Stage 3 tuning?
Stage 3 tuning generally involves more extensive hardware modifications, such as upgraded turbochargers and supporting components, alongside a suitable custom ECU calibration. The exact requirements depend on the vehicle and performance target.
Will my ECU or TCU need unlocking?
Your BMW 840i G14/G15/G16 is listed with a Bosch MG1CS003 ECU. The exact ECU software and access requirements must be checked against the vehicle before tuning. Any gearbox control unit requirements will also need to be confirmed separately.
Book Your BMW 840i Remap
Ready to upgrade your BMW 840i?
Book your BMW 840i G14/G15/G16 Stage 1 remap with Onyx Performance in Slough, or contact us to discuss Stage 2 tuning and supporting upgrades.
We can also help with gearbox tuning, servicing, diagnostics, exhausts, intakes, intercoolers, performance parts, styling, brakes, suspension and vehicle security.
Call: 01753 439321
Monday-Friday: 10AM-6PM
Saturday: 10AM-3PM
Onyx Performance – BMW 840i G14/G15/G16 Remapping and Performance Tuning in Slough, Berkshire.
Contact Onyx Performance
Transform your BMW 840i 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!
