Stage 1 & 2 Remaps
Expert ECU remapping for more power and torque, sharper throttle and better economy — fuel-optimised or performance maps to suit how you drive.
- More power & torque
- Better fuel economy
- Enhanced throttle response
Bespoke ECU & TCU Tuning · Chesham, Bucks
ECU Remapping & Vehicle Tuning in Chesham
Custom-mapped power, sharper response and better economy — every map built around your vehicle, not pulled off a shelf. Workshop or mobile, within 15 miles.
★ 5.0 on Google
📍 Mobile within 15 miles
🕖 7 days a week
BMW 335d — FUEL-OPTIMISED REMAP
REAL CUSTOMER JOB · DYNO
Stock
Blue Optimize
+25
bhp · 313 → 338
+35
Nm · 630 → 665
UP TO 10%
fuel saved
Real customer result — BMW 335d Blue Optimize fuel-optimised remap, completed in Chesham. Gains vary by vehicle & spec; every map is dyno-tested and safety-validated by our master tuner before installation.
What we do
Our Bespoke Services
Every job starts with reading your vehicle and finishes with a map written for it. Tell us what you're after and we'll quote it.
DPF Solutions
Diagnose and resolve diesel particulate filter faults, blockages and limp mode. Delete solutions are available strictly for off-road and track vehicles, with full diagnostics first.
- Full diagnostics before any work
- Properly coded, fault-free finish
- Off-road & track vehicles only
AdBlue / SCR Solutions
Diagnostics and resolution for recurring SCR/AdBlue faults, warning lights and countdown errors. System removal is carried out strictly on off-road and track vehicles.
- Fault-code led diagnostics
- Recurring SCR faults resolved
- Off-road & track vehicles only
Pops & Bangs
Popcorn / sportier note
Gearbox TCU
Faster, sharper shifts
EGR Delete
Off-road vehicles
DTC Deletes
Clear fault codes
Speed Limiter
Removal / adjustment
Stop / Start Delete
Disable auto stop/start
Aircon Regas
Cool air restored
Servicing
Oil, filters & health checks
Gains Calculator
Check your reg — see typical gains
Explore services
Car Tuning Services in Chesham
Detailed pages for the most searched tuning, diesel, gearbox and maintenance services around Chesham.
ECU Remapping CheshamBespoke ECU tuning for performance, torque and fuel efficiency.
Stage 1 & 2 RemapsSoftware-only and hardware-supported remap options.
DPF, AdBlue & EGRDiagnostics and off-road/track-use diesel solutions.
Gearbox / TCU RemapSharper shifts and improved transmission behaviour.
Aircon & ServicingAircon regas, servicing, diagnostics and health checks.
Contact & QuoteSend your reg, postcode and selected services.Remap Gains CalculatorEnter your reg to see typical power and torque gains for your engine.
How it works
From Quote to Tuned
A straightforward four-step process, whether you come to us or we come to you.
01
Tell us about your car
Send your reg, postcode and the service you're after. We’ll confirm what’s possible, provide a quote and guide you towards the right option for your vehicle.
02
Read & back up
We read the original file from your ECU/TCU and keep a safe backup before any changes.
03
Dyno-tested file
Your map is built and dyno-tested for safety by our master tuner, matched to your exact vehicle and spec.
04
Flash & verify
We write the map, check it's running clean and hand the car back fully tested.
Why Merlin
Built around your vehicle
5+
Years tuning experience
15mi
Mobile service radius
7
Days a week, early till late
100%
Bespoke, backed-up maps
- IMI certified · Viezu master tuner network. Remapping work comes with Viezu's insurance-backed guarantee, 30-day money-back promise and lifetime software guarantee.
- Dyno-tested, safety-validated maps. Every file is checked on the dyno by a master tuner before it goes anywhere near your vehicle.
- Original file always backed up. Your stock map is saved so the car can be returned to standard.
- We come to you. Mobile tuning across Chesham and within 15 miles of Buckinghamshire.
★★★★★
Excellent job on our Sprinter van. Raheem gave great advice and finished to an exceptional standard, on time and at a competitive price.
— MAGS Transport Ltd · Google
★★★★★
Sorted my AdBlue issue quickly and was super easy to deal with. Really happy with the service.
— Abdulrahman I. · Google
★★★★★
Other tuning companies couldn't map my Volvo C30 — Merlin did. Really happy with how the car performs now. Would recommend all day long.
— Volvo C30 owner · Trustpilot
★★★★★
Competitive pricing and great results to match. Best customer service around — would highly recommend.
— James · Google
⭐ Reviews from Google and Trustpilot.
About
About Merlin Performance
At Merlin Performance we specialise in bespoke ECU and TCU tuning to unlock your vehicle's full potential — enhancing power, improving efficiency and delivering a smoother, more responsive drive.
We are IMI certified and tune as part of the Viezu master tuner network. Every remap file is custom-developed and dyno-tested under Viezu's ISO 9001:2015 quality system, and our ECU remapping work is backed by Viezu's insurance-backed guarantee, 30-day money-back promise and lifetime software guarantee — if a tuning file ever needs reinstalling, you're covered. Your original file is always backed up before we begin, so your vehicle can be returned to standard at any time.
We offer a wide range of custom solutions: Stage 1 & 2 ECU and fuel remaps to optimise power and efficiency, Pops & Bangs maps for a sportier note, gearbox (TCU) remaps for faster shifts, diagnostics-led DPF, AdBlue & EGR work, plus DTC deletes, Stop / Start Delete and speed-limiter adjustment. Alongside tuning we also offer aircon regas and general servicing to keep your vehicle running right.
Based in Chesham, Buckinghamshire, we also offer a mobile tuning service within a 15-mile radius — bringing expert performance work straight to your door.
Recent work
Real vehicles. Real results.
Selected customer vehicles and recent tuning work completed in Chesham by Merlin Performance Tuning.
Audi Stage 1 ECU RemapAudi Stage 1 ECU remap completed in Chesham by Merlin Performance Tuning.
Audi Stage 1 RemapAudi Stage 1 remap completed in Chesham by Merlin Performance Tuning.
BMW 335d Optimisation TuneFuel optimisation remap, stop/start delete and sports display update completed in Chesham by Merlin Performance Tuning.
Ford Van AdBlue SolutionFord van AdBlue solution completed in Chesham by Merlin Performance Tuning.
Ford Van DPF SolutionFord van DPF solution completed in Chesham by Merlin Performance Tuning.
Mazda DPF SolutionMazda DPF solution completed in Chesham by Merlin Performance Tuning.
VW Blue Optimize TuneVolkswagen Blue Optimize fuel efficiency tune completed in Chesham by Merlin Performance Tuning.
Ford Ranger DPF JobFord Ranger DPF solution completed in Chesham by Merlin Performance Tuning.
See Google reviews
Photos are real job examples; reviews are linked separately so each image is not implied to be a specific review.
Local mobile coverage
ECU Remapping Service Areas
Based in Chesham, we provide workshop and mobile tuning support across nearby towns within our local 15-mile service area.
CheshamAmershamBerkhamstedTringHemel HempsteadHigh WycombeGreat MissendenLittle ChalfontChalfont St GilesChalfont St PeterChorleywoodRickmansworthBovingdonKings LangleyBeaconsfieldWendoverHolmer GreenAylesburyWatfordSt Albans
Check your postcode
Send your registration, postcode and services needed. We will confirm whether workshop or mobile service is suitable for your area.
Questions
ECU Remapping FAQs
Quick answers about file backup, mobile service, economy tuning, diesel solutions and quote requests.
Do you back up the original ECU file?
Yes. The original file is safely backed up before tuning work is carried out, so the vehicle can be returned to standard if required.
Do you offer mobile tuning?
Yes. Merlin Performance Tuning offers workshop and mobile service within 15 miles of Chesham where suitable.
What areas do you cover?
We are based in Chesham and cover nearby areas within a 15-mile radius, including Amersham, Berkhamsted, Tring, Hemel Hempstead, High Wycombe and other surrounding towns. See our service areas page for the full list.
Can I select more than one service?
Yes. The quote form lets you select multiple services in one enquiry, such as remapping, diagnostics, aircon regas and servicing.
Will a remap improve fuel economy?
It can, depending on the vehicle and driving style. A fuel-optimise remap is designed to improve drivability and efficiency, while performance maps focus more on power and response.
Are DPF, AdBlue and EGR services for road use?
DPF, AdBlue/SCR and EGR delete services are intended only for off-road or track-use vehicles and not for vehicles used on public roads.
How do I get a quote?
Send your registration, postcode, contact details and the services you need using the quote form. We will confirm what is suitable and come back with a price.
Guides & advice
Thinking about a remap? Start here
Honest answers to the questions we get asked most — no jargon, no sales spin.
How much does a remap cost?
A straight breakdown of UK remap pricing and what actually changes the figure.
Is a remap worth it?
The real benefits, the trade-offs, and who gets the most from it.
Warranty & insurance
The honest position on warranty and why you must declare a remap to your insurer.
Stage 1 vs Stage 2
What the stages mean and which one actually suits your car.
Get in touch
Get a Free Quote
Call, WhatsApp or send the form. Tell us your reg and the service you want and we'll come back with a price.
Find us
HP5 2NN · Chesham, Buckinghamshire, United Kingdom
Mobile service within 15 miles.
Opening Hours
| Mon | 07:00 – 21:00 |
| Tue | 07:00 – 21:00 |
| Wed | 07:00 – 21:00 |
| Thu | 07:00 – 21:00 |
| Fri | 07:00 – 21:00 |
| Sat | 07:00 – 18:00 |
| Sun | 07:00 – 14:00 |
Open every day except Christmas Day & New Year's Day.