FAQ — Welsh Coast Tuning

Yes — when it's done properly. Every file we install is written specifically for your vehicle's exact engine, gearbox and ECU revision, then calibrated within the manufacturer's safe tolerances for cylinder pressure, EGT (exhaust gas temperature), turbo boost and injection duration. We never push hardware beyond what it was engineered to handle. Our maps are dyno-developed and road-tested by professional calibrators before being released, and we hold a copy of your original (stock) file as a safety net. If you'd like, we can show you the live data logs taken during your tune so you can see exactly what's been changed and why it's safe.

It depends on your engine. Modern turbocharged diesels typically see +25–35% power and +30–40% torque from a Stage 1 remap because the manufacturer has left a lot of headroom for global emissions and fuel-quality variation. Naturally aspirated petrols see smaller gains (5–12%) since there's less untapped potential without forced induction. Turbocharged petrols sit in between (+15–25%). On the lookup page you can enter your exact make, model and engine to see realistic before/after BHP and torque figures for your vehicle.

Stage 1 is a software-only remap on a completely standard vehicle — no hardware changes required. It safely extracts the performance the factory left on the table. Stage 2 is for vehicles that have supporting hardware modifications fitted, such as a higher-flowing intercooler, downpipe, induction kit or upgraded turbo. The map is then calibrated specifically to those modifications, allowing significantly higher power and torque safely. We'll always advise honestly which stage suits your goals, your budget and your vehicle's mechanical condition.

Usually yes — especially on diesels and on motorway/steady-cruise driving. The torque gain means you can stay in higher gears for longer and use less throttle to maintain speed, which directly reduces fuel consumption. Customers commonly report +3–8 mpg on long runs. The catch: if you spend all your new-found power exploring the rev range, you'll obviously use more fuel. Driven sensibly, a Stage 1 economy tune typically pays for itself within 12–18 months on a daily-driven car.

Any modification — including a remap — should be declared to your insurer. The good news is that most mainstream insurers will cover a remap, sometimes with a small premium adjustment, and several specialist performance insurers actively welcome remapped vehicles at no extra cost. We can supply written documentation of the work carried out, which is what insurers typically ask for. If you'd like, we can recommend insurance providers who are known to be remap-friendly.

If your car is still within the manufacturer's warranty period, a remap can affect the powertrain portion of that warranty if the manufacturer detects it during a service. Non-powertrain items (electrics, trim, brakes etc.) are unaffected. Because we keep your original file on record, we can flash your ECU back to fully stock before any dealer visit and reinstall the tune afterwards — many of our customers do exactly this. We'll always have an honest conversation about warranty risk before booking.

Most remaps take 45–90 minutes from arrival to drive-away. The process: we connect to your vehicle's OBD port, read the original ECU file, send it to our calibration team (or load a pre-developed file specific to your vehicle), write the new file back to the ECU, then carry out a short road-test or live-data check. Nothing is physically removed from the engine bay. More complex jobs (Stage 2, DPF/EGR solutions, ECU-out tuning on older vehicles) can take 2–3 hours.

Yes — that's the entire point of the service. Our mobile setup is fully self-contained, so all we need is your car parked somewhere reasonably accessible (driveway, car park, depot yard) and the keys. We've tuned cars on residential driveways, in supermarket car parks during a lunch break, on industrial estates and at customers' workplaces. There's no need for a power supply or any prep on your end — we bring everything.

We've never had it happen, but if you genuinely aren't satisfied with how the car drives after the tune, we'll either re-calibrate it to better suit your preferences (e.g. softer low-end, more aggressive throttle, smoother power delivery) or revert your ECU to the original stock file at no charge. Your satisfaction is the only metric that matters — we'd rather adjust the map than have an unhappy customer drive away.

Yes, completely. We always read and securely store your original ECU file before installing any tune. At any point — for selling the car, a dealer service, an MOT concern or simply changing your mind — we can flash the original file back, and your ECU will be byte-for-byte identical to how it left the factory. There's no permanent change to the hardware.

Yes. A remap doesn't introduce any visible modification, doesn't change emissions enough to fail an MOT (Stage 1 maps are calibrated to remain within emissions tolerances), and doesn't trigger any dashboard warning lights. DPF/EGR delete solutions are a different matter and we'll discuss MOT and legal implications with you fully before carrying out any emissions-related work.

Both — and pretty much anything with an ECU. Diesel cars and vans, petrol cars (turbo and naturally aspirated), hybrids, motorhomes, light commercials, agricultural tractors, plant machinery and even some marine engines. If you can give us the make, model, year and engine code, we can almost certainly tell you within minutes whether we have a tune available for it.

These are software solutions for known emissions-system problems on diesel vehicles. DPF (Diesel Particulate Filter) solutions help vehicles where the filter is failing or blocking repeatedly. EGR (Exhaust Gas Recirculation) solutions address valves that stick or carbon up. AdBlue solutions help when the SCR/AdBlue system is faulty. We'll always advise on the legal and MOT implications before carrying out any emissions-related work, and recommend mechanical repair where appropriate.

Three options: (1) call or WhatsApp us with your vehicle details for an instant quote and booking slot, (2) use the contact form to send your details and we'll come back within a few hours, or (3) start with the vehicle lookup page to see your potential gains, then book directly from there. We typically have appointments available within 3–7 days, and same-week or even same-day slots are sometimes available.

Bank transfer, debit/credit card on the day (we have a mobile card reader), or cash. Payment is only taken once the remap is complete, you've test-driven the car and you're happy with the result. No deposits required for standard bookings; longer/specialist jobs may require a small deposit to secure parts or specialist file development.

All of it. From Cardiff, Newport and the south coast through Swansea, Llanelli and Pembrokeshire, up through mid-Wales (Brecon, Aberystwyth, Newtown), into north Wales (Wrexham, Bangor, Llandudno, Anglesey) and everywhere in between. There's no travel charge within standard coverage. If you're outside Wales (border areas of England especially), get in touch — we can often still come to you.

Frequently asked questions

Ready to unlock your car's performance?