ABOUT US
At JM Performance, we’re passionate about precision tuning and performance enhancement. Based in the heart of Wiltshire, we specialise in ECU remapping, engine tuning, and vehicle optimisation for all makes and models. With years of hands-on experience and a reputation built on results, we deliver tailored remaps that unlock power, improve efficiency, and transform the driving experience.
Our workshop combines the latest diagnostic technology with expert calibration knowledge — ensuring every tune meets the highest standards of performance, reliability, and safety. Whether you’re looking for more torque, better fuel economy, or a smoother throttle response, JM Performance is Wiltshire’s trusted name in professional vehicle remapping.
Our
Story
Get to Know Us
JM Performance was founded with a simple goal: to bring engineering integrity and genuine expertise back into the world of vehicle tuning. What started as a passion for performance quickly evolved into a trusted local business, helping drivers across Wiltshire and beyond get the most out of their vehicles — safely, efficiently, and professionally.
Our journey began in a small workshop, where attention to detail and honest workmanship set us apart from day one. Word spread quickly, and so did our commitment to doing things properly. Today, JM Performance continues to grow — but our values remain the same:
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Quality over quantity
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Knowledge over shortcuts
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Performance without compromise
We believe tuning should be done by people who understand engines, not just those who plug in a laptop. That’s why every member of our team is IMI Certified and trained to the highest standards, ensuring every customer leaves with a car that performs better, drives smoother, and runs safely.
Unlike many tuning companies that simply flash generic files, our IMI-Certified technicians have a deep understanding of how engines and control systems truly work. This expertise allows us to carry out every remap with precision, ensuring that performance gains are achieved safely and reliably — without compromising engine health or drivability.
6 Reasons Drivers Trust JM Performance
✅ Expertise You Can Trust
Our IMI-Certified team combines years of technical experience with a genuine understanding of modern engine management systems — ensuring every remap is engineered, not guessed.
✅ Transparent, Fair Pricing
You’ll always get honest pricing and realistic performance expectations. No gimmicks, no shortcuts — just quality work carried out to professional standards.
✅ Real Results, Not Empty Claims
We use industry-proven methods and advanced tools to deliver genuine performance and efficiency gains, never exaggerated figures or false promises.
✅ Customer-Focused and Confidential
Your satisfaction and privacy matter to us. All appointments are handled professionally and confidentially, and we never share or sell your data.
✅ Custom-Calibrated for Your Vehicle
We don’t rely on off-the-shelf tuning files. Every remap is individually calibrated to your vehicle’s specific software version, hardware setup, and condition — guaranteeing safe, consistent, and optimised results every time.
Choose JM Performance for specialist ECU remapping, performance tuning, and fuel-saving solutions backed by expertise, integrity, and precision.
Because your vehicle deserves more than just a file upload — it deserves a professional tune built by engineers who care.
Why Choose JM Performance?
At JM Performance, we do things differently. Our focus isn’t on quick fixes or generic tuning files — it’s on engineering precision, customer trust, and proven performance results. As one of Wiltshire’s leading ECU remapping and vehicle tuning specialists, we take pride in offering genuine, data-driven improvements that enhance power, driveability, and efficiency — all without compromising engine longevity.
When you choose JM Performance, you’re choosing IMI-Certified technicians who truly understand how engines and control systems work. Every vehicle we tune is treated as unique — carefully assessed, calibrated, and tested to achieve the perfect balance between performance, reliability, and safety.
Where Knowledge Meets Performance
When it comes to ECU remapping and performance tuning, true expertise matters. While low-cost “file flash” services might promise quick results, they often come at the expense of engine health, reliability, and real-world performance.
At JM Performance, every remap is carried out by IMI-Certified technicians who understand the science behind engine calibration — not just how to upload a file. We use a methodical, data-driven approach to deliver precision tuning that’s safe, reliable, and perfectly suited to each vehicle.
What sets JM Performance apart?
✅ Engineered, Not Just Tuned
Each remap is developed using real calibration data and in-depth understanding of engine management systems — ensuring power delivery that’s smooth, safe, and consistent.
✅ Dyno-Developed and Road-Tested
We rely on dyno-verified data and real-world testing to fine-tune every map, achieving optimal power, torque, and throttle response for your exact setup.
✅ Power You Can Feel — Safely
Experience up to 35% power gains and noticeably sharper acceleration without compromising reliability or emissions compliance.
✅ Improved Fuel Efficiency
Through intelligent recalibration, most customers see up to 15% better fuel economy, especially on diesel and turbocharged petrol engines — saving you money at the pump.
✅ Custom-Calibrated for Every Vehicle
We don’t use generic files. Every tune is individually adjusted to suit your vehicle’s software version, condition, and driver preferences — because no two cars are the same.
Book today!
At JM Performance, we believe tuning should enhance your car’s performance, efficiency, and reliability — not compromise them.
Our reputation across Wiltshire and the South West is built on trust, precision, and proven results — helping drivers unlock their vehicle’s true potential with confidence.
Our Vision
Engineering the Future of Performance
At JM Performance, tuning isn’t just our trade — it’s our craft. We blend engineering precision, modern calibration science, and a genuine passion for performance to create results that go beyond expectation. Every project we take on is an opportunity to push boundaries, refine technique, and raise the standard of what professional tuning should be.
We’re continually investing in cutting-edge tools, software, and training, ensuring our methods evolve alongside the technology inside today’s vehicles. This dedication to progress means every JM Performance tune isn’t just powerful — it’s intelligent, efficient, and future-ready.
What drives us isn’t just horsepower — it’s the pursuit of perfection. From the first diagnostic check to the final calibration, every adjustment is made with purpose, accuracy, and respect for the engineering behind your vehicle.
Our vision is simple: to keep redefining what’s possible in safe, smart, and sustainable performance tuning, setting a benchmark that others aim to follow.
JM Performance Services
Tailoring Your Software Upgrade
At JM Performance, every remap is uniquely tailored to your vehicle — no generic files, no shortcuts. We create custom ECU and TCU calibrations that deliver the exact driving experience you’re looking for, whether that’s maximum performance, refined efficiency, or enhanced drivability.
⚙️ Tuning Levels
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Stage 1 Remap – Optimised for standard hardware. Safe, reliable power and torque gains designed for everyday driving.
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Stage 2 Remap – Enhanced mapping for vehicles with performance upgrades such as intake, exhaust, or intercooler modifications.
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Stage 3 Remap – Fully custom calibration for heavily modified setups, including upgraded turbos, injectors, or fueling systems.
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Eco-Tuning – Designed to maximise fuel economy and torque efficiency, ideal for high-mileage drivers or fleets.
🔧 Additional Software Options
Take your tune further with our range of advanced software features and delete services, all carried out safely and professionally using verified data and certified tools:
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DPF Delete / DPF Off (for off-road & motorsport use only)
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EGR Delete / EGR Off
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AdBlue / SCR System Removal
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Swirl Flap & Intake Flap Delete
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Speed Limiter Removal
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Rev Limiter Adjustment
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Popcorn Limiter & Pop & Bang Maps
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Launch Control Activation
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Start/Stop Disable
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Hardcut Limiter (Diesel)
All of our software modifications are developed in-house using authentic tuning tools, with careful attention to engine safety, diagnostics, and drivability.
🔩 Custom Solutions for Every Driver
Whether you’re chasing more power, sharper throttle response, or better fuel economy, JM Performance will design a bespoke tuning package matched precisely to your engine, software version, and driving goals.
Our expertise ensures you get maximum results with complete reliability — every time.
🔧 ECU Remapping
Our specialist ECU remapping service is more than a simple file upload — it’s a full recalibration of your vehicle’s engine management system. Using advanced tuning software and factory-level diagnostic tools, we fine-tune parameters such as boost pressure, ignition timing, torque limits, and fuel delivery to safely unlock hidden performance while maintaining full engine integrity.
Custom & Stage 1–3 Tuning
From Stage 1 performance upgrades to advanced Stage 3 calibrations for modified builds, we deliver smooth, safe, and consistent power gains tailored to your setup.
Prefer economy over outright performance? Our Eco and Stage 1+ calibrations improve torque delivery, throttle response, and can offer up to 15% better fuel economy — perfect for both daily drivers and fleet vehicles.
DPF, EGR & AdBlue Solutions (for Off-Road Use Only)
For motorsport and off-road applications, we provide safe, legal, and reliable DPF, EGR, and AdBlue system modifications where applicable.
Specialist Services
Advanced data logging and performance testing, Intake and exhaust optimisation
Turbo and injector calibration support, Bespoke tuning consultation for modified builds
📍 ECU Remapping & Vehicle Tuning in Wiltshire | JM Performance
At JM Performance, we deliver precision ECU remapping, performance tuning, and engine calibration for petrol, diesel, hybrid, and turbocharged vehicles across Wiltshire, Swindon, Chippenham, Trowbridge, Melksham, Calne, Devizes, Marlborough, Bath, Bristol, Frome, Warminster, Amesbury, and the wider South West of England.
Our IMI-Certified engineers provide Stage 1, Stage 2, and Stage 3 remaps, eco remapping for improved MPG, and TCU gearbox tuning for both manual and automatic transmissions, including DSG, ZF, S-Tronic, Tiptronic, and Powershift systems. Every tune is custom-built using verified data, professional equipment, and safe calibration methods — giving you measurable power gains, improved torque, and refined drivability without compromising reliability.
🚗 Brands We Tune
We offer specialist ECU and gearbox tuning for nearly every manufacturer, including:
Audi, BMW, Volkswagen (VW), Mercedes-Benz, Ford, Vauxhall, SEAT, Skoda, Land Rover, Range Rover, Jaguar, Mini, Volvo, Peugeot, Citroën, Renault, Fiat, Alfa Romeo, Abarth, Nissan, Toyota, Honda, Lexus, Mazda, Mitsubishi, Subaru, Suzuki, Hyundai, Kia, Porsche, Tesla, Bentley, Maserati, Jeep, Chrysler, Dodge, Chevrolet, Isuzu, Iveco, Dacia, MG, SsangYong, and many more.
Whether it’s a BMW 320d remap, Audi A3 TDI Stage 1 tune, VW Golf GTI Stage 2 upgrade, Ford Transit Custom Eco remap, or Range Rover Sport power tune, our team has the experience, software access, and technical knowledge to deliver flawless results.
⚙️ Software Upgrades & Additional Options
Our software solutions go far beyond standard tuning. JM Performance provides:
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DPF Delete / DPF Off (motorsport & off-road use only)
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EGR Delete / EGR Off
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AdBlue / SCR System Removal
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Swirl Flap Delete & Intake Flap Solutions
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Speed Limiter Removal & Rev Limiter Adjustment
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Launch Control & Flat-Shift Activation
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Popcorn Limiter & Pop and Bang Maps
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Hardcut Limiter (Diesel)
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Start/Stop Disable
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Cold Start Noise Reduction
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Cat Monitoring & O2 Sensor Solutions
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Immobiliser Delete (IMMO Off)
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Throttle Response Enhancement & Pedal Tuning
Every modification is developed in-house using authentic tuning tools and verified files to maintain engine safety, correct diagnostics, and reliability under all conditions.
🧠 Specialist Services
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Dyno-verified tested software & data logging
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Advanced diagnostic and fault-code analysis
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Turbo and injector optimisation
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Performance consultation for modified builds
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Fleet and commercial vehicle economy tuning
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Hybrid & plug-in vehicle remap compatibility checks
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Software restoration for vehicles previously tuned elsewhere
🔩 Precision. Power. Reliability.
JM Performance is trusted throughout Wiltshire, Swindon, Bristol, Bath, Chippenham, Salisbury, Trowbridge, Devizes, and the South West for providing honest, safe, and professional ECU tuning that transforms how vehicles perform.
If you’re searching for:
“ECU remapping Wiltshire”
“car tuning Swindon”
“diesel remap Chippenham”
“Stage 1 remap Bath”
“performance tuning Bristol”
“VW remap Trowbridge”
“BMW remap Salisbury”
“Audi remap Wiltshire”
“gearbox tuning near me”
You’ve already found the specialists who do it properly — engineers who combine knowledge, precision, and passion to deliver results you can trust.
JM Performance — Wiltshire’s leading name in ECU remapping, engine tuning, and performance calibration. Visit our workshop in Royal Wooton Bassett, Swindon
📍Unit 2B, Hope Well House, Royal Wootton Bassett, Swindon SN4 7DB
PROS THAT CARE
Our goal is to deliver the best quality remap for the most reasonable price.
We believe in providing the highest level of service in all areas of our expertise. We will literally go the extra mile to provide you with satisfaction at the brink of the accelerator.
We believe that if a job's worth doing, then it's worth doing well.
That means we may take a little longer to get the job done, but when you get it back it will be right. We do not cut corners and treat every vehicle as if it were our own. We call a spade a spade and will advise you as best we can with any car-related queries.
Looking to give your car a new lease of life? Look no further than JM Performance Automotive! Our team of IMI qualified technicians are passionate about unlocking the full potential of your vehicle, no matter what make or model you drive. From Porsches to Fords, we can provide custom-written software to enhance your car's power, torque, and fuel efficiency, as well as offer a range of other adjustments such as DPF, EGR, and swirl.
We use only genuine tools such as Autel, Auto-tuner, Kess, and Snap-On to ensure the highest quality results for your vehicle. With four workshops located across Wiltshire and the option of a mobile service for an additional travel charge, we make it easy for you to get the performance upgrades you need.
But that's not all – we're a fully licensed and insured LTD company, and we offer interest-free finance options to help you spread the cost of your upgrade. Plus, with live data logging and on-road live mapping, you can be confident that your vehicle is in good hands with us.
So why wait? Contact us today for a quote with your registration for more information. Y learn more about our range of services. Join our list of satisfied customers and experience the thrill of a fully optimized car with JM Performance Automotive!
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