Performance Engine Tuning and ECU Software Upgrades

Performance Engine Tuning & ECU Upgrades

Unlock maximum performance and driving enjoyment with our engine tuning and ECU software upgrades at our Langley, Slough performance garage. Whether you own a high-performance sports car, luxury vehicle, or modified project build, our tuning specialists deliver precise software calibrations to optimise power, torque, throttle response, and fuel efficiency.

Every modern engine is controlled by an ECU (Engine Control Unit), which manages air-fuel ratios, ignition timing, boost pressure, and other key parameters. From the factory, these settings are often conservative to meet wide market conditions. With our custom ECU remapping, we tailor these parameters to suit your car’s hardware, fuel quality, and driving style – achieving sharper throttle response, stronger mid-range pull, and increased top-end power.

We offer Stage 1, Stage 2, and Stage 3 tuning packages, covering everything from stock engines to fully modified performance builds with upgraded turbos, exhausts, intercoolers, and fuelling systems. All tuning is carried out using dyno-tested maps for maximum reliability, with the option for road tuning to fine-tune driveability in real-world conditions.

Tuning Gain Calculator

Why Choose Onyx Performance?

As Seen on Carwow

We’ve been proudly featured on Carwow – a testament to the quality, professionalism, and performance-focused results that set us apart. Watch our feature here to see us in action.

Expertise You Can Trust

With years of experience and deep technical knowledge, our team understands performance vehicles inside and out – from custom remaps to high-end servicing.

Advanced Workshop & Tools

We operate from a state-of-the-art facility in Slough, equipped with cutting-edge diagnostics, dyno testing, and industry-leading tools for accurate, high-quality work.

Tailored Solutions for Every Vehicle

We don’t believe in one-size-fits-all. Every car gets a bespoke approach, ensuring the best results whether it’s a remap, upgrade, or routine service.

Trusted Nationwide

Performance enthusiasts from across the UK come to Onyx because they know they’ll receive premium-quality workmanship, careful attention to detail, and honest advice.

Complete Care, All in One Place

From tuning and servicing to tyres, trackers, and immobilisers – we offer a full suite of services under one roof, all with a strong focus on safety, reliability, and top-tier customer support.

Customer Reviews

    
 
 
       Posted on Google  
   
   Mark Wiltshire 
 
 
 
 Trustindex verifies that the original source of the review is Google. Professional yet friendly, very helpful would recommend 👍
  
 
      Posted on Google  
   
   Paul Forrester 
 
 
 
 Trustindex verifies that the original source of the review is Google. Nice refurbishment of my alloys
  
 
      Posted on Google  
   
   Noel Kerins 
 
 
 
 Trustindex verifies that the original source of the review is Google. Excellent service, great quality job on 2 of my black alloys. They also did my father & husbands cars too. Great value for money and a special thanks to Ben.
  
 
      Posted on Google  
   
   Jamie Taylor 
 
 
 
 Trustindex verifies that the original source of the review is Google. Had my golf R mapped and tuned to stage 2 very impressed with the work they done Ben and Sam great guys very friendly and very professional would recommend 👍🏻
  
 
      Posted on Google  
   
   DSK 
 
 
 
 Trustindex verifies that the original source of the review is Google. Brought my Audi S3 in for a Stage 3 tune with a bigger turbo and full supporting mods. Things didn’t start smoothly — the Falcon turbo I had fitted from eBay turned out to be faulty and smoked heavily on the dyno.Instead of rushing the job or giving me attitude, they helped me swap it out for a proper Garrett PowerMax and carried on professionally. Then I ran into fueling problems caused by another low‑quality eBay part, and again they took their time, diagnosed the issue properly, fixed it, and made sure everything was right before continuing.After all the setbacks, they still mapped the car, spent a lot of time on it, and didn’t charge me anywhere near what the work was worth.They showed patience, honesty, and real skill. Very happy with the service and the way they looked after me.
  
 
      Posted on Google  
   
   randip 
 
 
 
 Trustindex verifies that the original source of the review is Google. Highly recommended. Fitted my catless downpipe and full exhaust on my Audi RS7. The sound is amazing!

The staff were very friendly and kept me updated at every step of the process
  
 
      Posted on Google  
   
   Dan Simmonds 
 
 
 
 Trustindex verifies that the original source of the review is Google. This is the second time I have used Onyx Performance first time for wheel refurbishment and last time for remap and i would use their services again in the future without a doubt. They are very knowledgeable about what they specialise in, they are polite and you can see they care not only about what their customers want to do but also about what they can offer the customer. Thanks to the OP team.
  
 
      Posted on Google  
   
   Taranjit Lehal 
 
 
 
 Trustindex verifies that the original source of the review is Google. Took my Mercedes C200 to Onyx performance for a stage 1 remap, my car is much quicker and throttle response is much better than before the remap. They also advise you about power and gains and the maps are tailored for your specific car and model, no stress on engine or gearbox. Thank Onyx , Brilliant work.
  
 
      Posted on Google  
   
   Carlos fernandez 
 
 
 
 Trustindex verifies that the original source of the review is Google. Absolutely fantastic service friendly customer service will definitely be going back for further modifications 5 star service do not go anywhere else other than onyx😎🙏🏼
  
 
      Posted on Google  
   
   Aurimas Gercas 
 
 
 
 Trustindex verifies that the original source of the review is Google. Great service, recommend.

Book Your ECU Remap or Performance Tune in Slough

Experience the full potential of your engine with our expert ECU tuning and software upgrades. Based in Langley, Slough, we deliver safe, powerful, and responsive performance gains tailored to your car. Call today to discuss your tuning package.

5-Star Google Reviews

0 +

Years of Experience

0 +

Customer Satisfaction

0 %

Why Choose Onyx Performance for Servicing?

Experts in Performance Cars

We know how to properly care for performance, modified, and luxury vehicles. Our team has the skills and experience to handle specialist requirements confidently.

Correct Service Schedules

Every service follows the exact schedule recommended by your vehicle’s manufacturer, helping maintain performance and protect your warranty.

Quality or OEM Parts

We only use high-quality aftermarket or original manufacturer parts, ensuring long-lasting reliability and top-level performance.

Full Vehicle Inspection

Our service goes beyond just changing oil. We inspect all key systems to keep your car safe, smooth, and road-ready.

Honest Advice, No Surprises

With transparent pricing and expert recommendations, you’ll always know what your car needs – no upselling, no hidden fees.

Fast, Trusted & Tracked

We offer quick turnaround, maintain service records, and send reminders – that’s why customers travel to us from across the UK.

Frequently Asked Questions

What’s the difference between ECU remapping and chip tuning?

Modern cars are tuned via ECU remapping, which rewrites the software inside your existing ECU. Chip tuning refers to older methods where a physical chip was replaced or modified.

How much extra power will I gain?

Power gains vary depending on the vehicle and modifications – Stage 1 can add 10–40% more power, while Stage 3 builds can deliver huge performance increases when combined with hardware upgrades.

Is ECU tuning safe for my engine?

Yes – when carried out by professionals using reliable maps and correct fuelling, tuning is safe and can even improve efficiency in some driving conditions.

Do you offer dyno tuning?

Yes – we can carry out tuning on a rolling road dyno for accurate before-and-after results, ensuring your engine is performing at its best.

Will ECU tuning void my warranty?

In most cases, yes – modifying your ECU can affect the manufacturer’s warranty. We can advise on options for reversible tuning if required.

Can you tune cars with upgraded turbos and exhausts?

Absolutely – we specialise in custom software for modified cars, ensuring all hardware upgrades work in harmony for maximum performance.

Get a quick quote

Drop us a line! or Message us on WhatsApp

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.