Before & After ECU Remap Dyno Results
Before & After ECU Remap Dyno Results – Proven Power 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.
Proven Dyno Power Gains with ECU Remapping in Slough
Don’t just feel the difference — see it on the dyno graph. Book your Slough-based ECU remap today and receive before-and-after rolling road results that prove the gains.
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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 result?
It’s a comparison of your car’s power and torque on our rolling road before the remap and after tuning.
Why should I have dyno-tested ECU remapping?
Dyno testing ensures your car is tuned under real-world load conditions, giving accurate, safe, and proven results.
Can I see exactly how much power my car has gained?
Yes — you’ll receive a dyno printout showing horsepower, torque, and power curves before and after remapping.
Is dyno tuning safe for my car?
Absolutely — our rolling road simulates real driving conditions in a controlled environment, making it safe and precise.
Do modified cars benefit from before-and-after dyno runs?
Yes — if your car has upgrades like a turbo, exhaust, or intake, dyno runs show exactly how much performance has improved.
Do you provide dyno-tested ECU remapping outside Slough?
Yes — while our rolling road is based in Slough, we welcome customers from across Berkshire and nationwide.
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