Gallery of Dyno Power Runs

Gallery of Dyno Power Runs – Before & After Results

Gallery of Dyno Power Runs

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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

Book Your Dyno Power Run in Slough

Our dyno testing shows the real difference in horsepower and torque before and after remapping, tuning, or performance upgrades. Join hundreds of customers who use our 2WD and 4WD rolling road to validate gains and track improvements.

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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

Why are before-and-after dyno runs important?

They show the true power and torque gains from remaps, exhaust upgrades, intake modifications, or turbo enhancements.

Do I get a printout of both runs?

Yes — we provide a detailed graph showing horsepower, torque, and AFR readings before and after tuning.

Can I book a dyno run just for before-and-after testing?

Yes — many customers book dyno sessions specifically to compare stock vs tuned results.

Are the results 100% accurate?

Our state-of-the-art rolling road dyno is calibrated for precise and repeatable measurements, ensuring reliable data.

Do you offer dyno runs for both 2WD and 4WD cars?

Yes — our facility supports 2WD and 4WD vehicles, including sports cars, supercars, and SUVs.

Do you host dyno days for car clubs to compare results?

Yes — we regularly run group dyno days where clubs and groups can see each other’s before-and-after results.

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