Current dyno offer

£150 off Stage 1, Stage 1+ and Stage 2

Register to save your vehicle, or browse to find your vehicle and see more information.

Register Find my vehicle →
power / torque

Your privacy choices

Choose how this site uses cookies

Essential cookies keep the website secure and working. With your permission, we’ll also use optional cookies for analytics, chat and advertising. Read our cookie policy.

Choose cookies

Cookie settings

Choose your optional cookies

Switch optional categories on or off. Saving replaces your current choice, and you can change it later.

Essential

Keeps core features secure and working.

Always on

  • Contact Us
  • Why Us
  • FAQs & Questions
  • ECU Tuning Wales
  • Remapping
  • Articles
  • Resources for Tuners
  • Custom vs OTS
  • Find My Car
  • Login
Llandow Tuning Center Logo Llandow Tuning Center Logo
  • Home
  • Why Us?
  • Performance

    BMW Engine Tuning

    View tuning options and performance figures for your selected vehicle.

    BMW Transmission

    Explore transmission care and supported calibration for your selected vehicle.

    BMW Upgrade Parts

    See supporting hardware and upgrade options for your selected vehicle.

    BMW Rolling Road Dyno

    View vehicle-specific dyno testing, validation and booking information.

    Custom vs Off-the-Shelf

    Compare generic maps with calibration measured and refined for the individual car.

    Tuning Stages Explained

    Understand Stage 1, Stage 1+, Stage 2 and how hardware changes what is suitable.

    Before You Tune

    Check servicing, faults, fuel and modifications before booking a tuning session.

    Dyno Sessions

    Book power runs, datalogging and controlled testing on our braked rolling road.

    View All Performance Information
  • Engine diagnostics & fault finding
    • Engine diagnostics & fault finding
    • Free code scan & assessment
    • Misfire diagnostics
    • Turbo & boost diagnostics
    • Injector fault diagnosis
    • Non-start diagnostics
    • Injector bench testing
    • Engines and engine rebuilds
    Transmission & drivetrain
    • Transmission diagnostics
    • Gearbox servicing & rebuilds
    • Gearbox tuning
    • Haldex servicing
    • xDrive servicing
    Vehicle care & inspections
    • Vehicle inspection & condition report
    • Vehicle servicing
    • MOT
    • Oil changes
    • Air conditioning
    • Disc skimming
    • Carburettor servicing
    SRS, ECU & coding
    • SRS & airbag diagnostics
    • ECU testing
    • Coding & programming
    • BMW & MINI coding
    • Mercedes-Benz coding
    • Ford coding
    • Volkswagen Group coding
    • Immobiliser diagnostics
    Emissions
    • DPF, EGR & AdBlue diagnostics
    • DPF diagnostics
    • AdBlue diagnostics
    • EGR repairs
    • DPF removal
    • AdBlue delete
    • EGR delete: common issues
    • AdBlue & SCR: common issues
    • Catalyst removal
    Engine cleaning & repairs
    • Carbon cleaning
    • Walnut blasting
    • Swirl flap repair & removal
    • Inlet manifolds
    • Ultrasonic cleaning
    • Engine & underbody steam cleaning
    • Carb repairs
    Performance & tuning
    • ECU tuning / remapping
    • Vintage tuning
    • Dyno sessions
    • Engine check-over
    • Fit to Map
    • Tuning inspection
    • Upgrade fitting
    • Turbo upgrades
    • Diesel fuelling upgrades
    • Exhaust
    • Motorsport services
    • Van & motorhome mapping
    View all services
  • FAQ
  • Tools
  • Contact
  • Login
  • BMW iX3 Selected vehicle BMW iX3 iX3 2021 iX3 286HP Electric
    BMW iX3 Selected vehicle BMW iX3 iX3 2021 iX3 286HP Electric
    Tuning options

    Performance

    Dyno testing Transmission Upgrade parts

    Care & Support

    Diagnostics Servicing Other services
    My Garage Add vehicle
  1. Find My Car
  2. Makes
  3. BMW
  4. 4 Series GC
  5. G26

BMW 4 Series GC G26

Choose a powertrain

Petrol powertrains

5 options
  • Petrol 420i (1.6T) 170HP Petrol 170 hp 250 Nm View tuning options >
  • Petrol 420i (2.0T) 184HP Petrol 184 hp 270 Nm View tuning options >
  • Petrol 430i (2.0T 245HP Petrol 245 hp 400 Nm View tuning options >
  • Petrol M440i (3.0T) 374HP Petrol 374 hp 500 Nm Engine B58B30TU1 View tuning options >
  • Petrol M440i (3.0T) 382HP Petrol 382 hp 500 Nm Engine B58B30TU1 View tuning options >

Diesel powertrains

3 options
  • Diesel 420D (2.0D) 188HP Diesel 188 hp 400 Nm Engine B47D20 View tuning options >
  • Diesel 430D (3.0D) 282HP Diesel 282 hp 650 Nm Engine B57D30 View tuning options >
  • Diesel M440d xDrive M440d xDrive B57D30 335HP Diesel 335 hp 700 Nm Engine B57D30T2 View tuning options >

Social

  • Facebook
  • Instagram
  • Twitter

Llandow Tuning

  • Home
  • Why Llandow Tuning?
  • Tuning FAQ
  • Articles
  • Local Facilities
  • Our Tools & Facilities
  • Contact

Performance

  • ECU Tuning Wales
  • Remapping Wales
  • Gearbox Tuning
  • Vintage and Classic Tuning
  • Motorsport Tuning
  • Dyno Sessions

Popular engines

  • BMW M57 tuning
  • BMW S63 tuning
  • All engines

Motorsport Partnerships

  • Motorsport Partnerships
  • Swansea University Race Engineering
  • Rocketdog Racing

Tuning Near You

  • Bridgend
  • Caerphilly
  • Cardiff
  • Carmarthenshire
  • Monmouthshire
  • Neath Port Talbot
  • Newport
  • Pembrokeshire
  • Powys
  • Rhondda
  • Swansea
  • Torfaen
  • Vale of Glamorgan
  • Our Competitors

Nearby Towns

Penarth, Cowbridge, Barry, Llantwit Major, Bridgend, Pontyclun, Llantrisant, Pencoed, Rhoose, St Athan, Porthcawl and Cardiff.

Services

  • All Our Services
  • DPF Diagnostics
  • DPF Delete Wales
  • Free Code Scan & Assessment
  • AdBlue Diagnostics
  • AdBlue Delete Wales
  • AdBlue & SCR: Common Issues
  • EGR Diagnostics
  • EGR Delete: Common Issues
  • O2 Sensor Deletes
  • Walnut Blasting
  • ECU Testing and Repairs

Latest News

  • Audi TT: 177HP to 254HP. The power change followed a custom calibratio...
  • BMW transmission control module update. The owner requested the latest...
  • Free initial scan for engine, AdBlue, DPF and EGR concerns. Bring the...
  • Mini Cooper JCW: 81HP gain with our custom Stage 1 dyno tune. The resu...
  • Citroen Relay: recurring limp mode after previous tuning. Diagnostics...
  • VW Caddy custom Stage 1 dyno session. A £100 discount was advertised a...
  • Just for fun, whom can tell me what make and model of car this engine...
  • Mini R56 Cooper S race setup: 305HP. We spent two days working through...
  • Mercedes C43 AMG: 419HP. We developed the custom calibration on the ca...
  • Porsche Stage 1 calibration and AdBlue/SCR software work. For an exist...
View all news

Technical Resources

  • Technical Resources for Tuners
  • DTC Error Codes
  • VAG DSG & S tronic Guide
  • SRS ECU Lookup
  • Battery & BMS Module Lookup
  • HP Calculators
  • Pressure Calculators
  • MAF Tester
  • FRF and SGO to BIN Converter
  • BMW 0DA to BIN Converter
  • CAT FLS / FL2 to BIN Converter
  • BMW FRM3 D-Flash to EEPROM Repair
  • BMW-ISN Exctractor
  • VBF to BIN Converter
  • Map definitions to WinOLS CSV
  • WinOLS NOREAD Remover
  • Bosch ECU Part Number Lookup
  • File Service

Common Issues

  • BMW N55 Issues
  • VAG 2.0 TFSI Issues
  • AdBlue & SCR Issues
  • EGR Delete Issues

Latest Articles

  • New automatic tuning tools are everywhere. The quality has not kept up
  • Why does my engine lose power or enter limp mode under load?
  • Underboost and P0299: does the turbo need replacing?
  • Why does my engine still misfire after replacing plugs or coils?
  • The 2027 emissions proposals, and what they mean for a remap
  • Post-2020 Ford Transit Custom Tuning Is Now Available
  • Who Actually Writes Your OTS Remap?
  • Do BM3 OTS Maps Really Outperform Custom Tunes?
  • Bosch MD1CS003 tuning protection: locked and unlocked ECU numbers explained
  • The Benefits of Upgrading an Intercooler on a Diesel Engine
View all articles
Llandow Tuning, Llandow Dyno Centre, Unit 11 Sambucus Avenue, Llandow Trading Estate, Llandow, Cowbridge, Vale of Glamorgan, CF71 7PB · 01446 355001
© 2026 Llandow Tuning. Vehicle names, badges and trademarks belong to their respective owners and are used to assist owners in identifying their vehicle. No manufacturer endorsement or affiliation is implied.
Llandow Tuning specialises in vehicle modifications. Our work often involves altering a vehicle from its factory specifications, typically for motorsport or fast road use.
All modifications and tuning are carried out at the owner's risk. Customers should fully understand and accept these risks before work begins.
Dyno and rolling road use is at the owner's risk. Any damage caused to the dyno, dyno cell, or due to fluid spills must be paid for before the vehicle is released.
It is the customer's responsibility to ensure the vehicle is ready for tuning/dyno time and free from fluid leaks unless otherwise agreed in writing beforehand.
GDPR Policy - All work is conducted under the assumption that the customer has read and agreed to our Terms and Conditions and reviewed our FAQ section, which addresses the most common queries.
Cookie settings and policy