Welcome to our remap calculator!
Find your vehicle performance gains here!
our remap calculator!
Find your vehicle performance gains here!
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.
Try Our Remap Calculator & Unlock Your Car’s Potential
Find out how much extra horsepower and torque your vehicle could gain with our Remap Calculator. Simply enter your car details to see the results instantly – then book a slot at our Slough workshop for a custom ECU remap. Stage 1, Stage 2, and advanced tuning options available for cars, vans, and performance vehicles.
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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
How accurate is the remap calculator?
The calculator provides a reliable guide based on manufacturer data and our tuning expertise. Actual results may vary depending on your car’s mileage, condition, and modifications.
Do I need to bring my car in to confirm the gains?
Yes – while the calculator gives you an estimate, a workshop inspection ensures the engine and components are in good health before tuning.
Can I see both Stage 1 and Stage 2 results?
Yes – the calculator can display expected Stage 1 (safe for stock hardware) and Stage 2 (with supporting mods) gains where available.
Does using the calculator mean I have to book a remap?
No – it’s a free tool to give you an idea of what’s possible. You can book a remap only if you’re happy with the expected gains.
Is this suitable for petrol and diesel vehicles?
Absolutely – our remap calculator covers most petrol, diesel, and performance models, including turbocharged and naturally aspirated engines.
Can you provide custom remap figures beyond the calculator?
Yes – if you have upgrades like a bigger turbo, intercooler, or exhaust, we can provide bespoke tuning figures tailored to your build.
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