Before and After Dyno Runs
Before and After Dyno Runs – Proven Performance Gains
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.
Before & After Dyno Runs in Slough
Book your car in for a dyno session at our Slough tuning centre and receive a before-and-after printout of your results. Don’t just feel the performance — see it proven on the dyno.
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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
What is a before-and-after dyno run?
It’s a comparison test that shows your car’s power and torque figures before tuning and after modifications or ECU remapping.
Why are dyno runs important?
They provide accurate, measurable proof of the improvements made by tuning, ensuring safe and reliable results.
Can I get a printout of my dyno results?
Yes — you’ll receive a dyno graph showing your car’s performance before and after tuning.
Do you test both 2WD and 4WD cars?
Yes — our rolling road supports front-wheel drive, rear-wheel drive, and all-wheel drive cars.
Are dyno runs safe for my car?
Absolutely — our dyno replicates real-world driving conditions in a controlled environment, making the process safe and precise.
Do you offer dyno runs outside Slough?
While our rolling road is based in Slough, we provide services to customers across Berkshire and nationwide.
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