McLaren GTS Remap & Tuning
Upgrade your McLaren GTS 635HP with professional Stage 1 and Stage 2 ECU tuning from Onyx Performance in Slough, Berkshire. Our tuning solutions for the 4.0 V8 Twin Turbo petrol engine are designed to deliver impressive power and torque gains, sharper throttle response and enhanced overall drivability.
The McLaren GTS combines everyday usability with the performance of a twin-turbocharged V8. Professional ECU calibration can enhance its performance, delivering stronger acceleration and a more responsive driving experience while retaining the character of this high-performance McLaren.
McLaren GTS Performance Figures
| Performance | Power (HP) | Torque (Nm) |
|---|---|---|
| Standard Performance | 635 | 630 |
| Stage 1 Remap | 700 | 760 |
| Stage 2 Remap | 740 | 800 |
Stage 1 Remap Price: £1,499.00
Original Price: £1,798.80
Stage 2 Remap: Call for a Stage 2 quote
Performance figures are indicative and may vary depending on vehicle condition, fuel quality, modifications and individual engine specifications.
Gearbox Tuning
A gearbox remap can complement your engine tune by optimising gear changes, shift response and transmission behaviour. Available options include:
- Stage 1 Gearbox Remap: Contact for Price
- Stage 2 Gearbox Remap: Contact for Price
- Stage 3 Gearbox Remap: Contact for Price
BEFORE TUNING
Before carrying out any ECU remapping, we recommend ensuring your McLaren GTS is in good mechanical condition. We check for existing fault codes and assess the vehicle to help ensure it is suitable for tuning.
SERVICING AND MAINTENANCE
Regular servicing is essential for maintaining performance and reliability. We recommend keeping up with engine oil, filters, spark plugs and other manufacturer-recommended maintenance, particularly on a high-performance twin-turbocharged engine.
EXHAUST UPGRADES
Enhance the sound and character of your McLaren with performance exhaust upgrades. We can help you explore exhaust options to complement your engine tuning and achieve the sound you want.
PERFORMANCE UPGRADES
For owners looking to go further, additional performance modifications can complement ECU tuning. We can discuss suitable upgrades for your GTS, taking into account your performance goals and vehicle specification.
STYLING AND BODY UPGRADES
Give your McLaren a more individual appearance with styling enhancements and body upgrades. Our team can help you explore options that complement the distinctive design of the GTS.
VEHICLE SECURITY
Protect your McLaren with vehicle security solutions designed to provide additional peace of mind. Contact our team to discuss the available options for your vehicle.
WHY CHOOSE ONYX PERFORMANCE?
At Onyx Performance, we provide professional vehicle tuning and performance solutions tailored to your car. Based in Slough, Berkshire, our services include ECU remapping, gearbox tuning, exhaust upgrades, styling enhancements and vehicle security.
REMAPPING IN SLOUGH
Onyx Performance provides professional ECU remapping in Slough, Berkshire. Whether you want to enhance your McLaren GTS with a Stage 1 or Stage 2 remap, our team can help you explore the right tuning option for your vehicle.
Frequently Asked Questions
How much power can a Stage 1 remap add to my McLaren GTS?
The Stage 1 remap can increase power from the standard 635HP to approximately 700HP, with torque increasing from 630Nm to 760Nm.
How much power can a Stage 2 remap produce?
The indicative Stage 2 figures are up to 740HP and 800Nm. Contact us for a Stage 2 quote and to discuss any supporting modifications required.
Do I need hardware upgrades for Stage 1 or Stage 2?
Stage 1 is generally designed for vehicles with standard hardware in good mechanical condition. Stage 2 may require supporting hardware upgrades, depending on the vehicle and tuning specification.
Can I have a gearbox remap with my engine remap?
Yes. Gearbox tuning can complement an engine remap by improving shift response and transmission behaviour. Contact us to discuss the options available for your McLaren GTS.
Can I have a dyno session?
Yes. We offer dyno sessions for £120.00 to help assess your vehicle’s performance.
Do you offer Stage 3 tuning?
Contact Onyx Performance to discuss Stage 3 tuning options and the hardware requirements for your McLaren GTS.
Does my McLaren need an ECU unlock?
Your McLaren GTS uses a Bosch ME17.8.33 ECU. ECU access requirements depend on the exact hardware and software version fitted to your vehicle. Contact us so we can advise on the correct tuning process.
BOOK YOUR REMAP
Contact Onyx Performance to discuss your McLaren GTS remap. Whether you are interested in Stage 1, Stage 2 or gearbox tuning, our team can help you choose the right solution.
Contact Onyx Performance
Transform your McLaren GTS 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.



