Toyota GR Yaris Power Upgrades

We can’t think of a more anticipated car and when our two Toyota GR Yaris development cars arrived at the end of 2020 we were thrilled that the hype was real. The goal was to make the GR Yaris more useable and fun to drive. We now have a range of products that will enhance your enjoyment of this outstanding performance car.

When the Yaris was first released the standard ECU could not be tuned so our customers only had the choice of our popular tuning box and a high end Syvecs replacement ECU. We are now able to tune the standard ECU and we have worked hard to put together all that we have learnt with our own Yaris’s and the high power development we have already completed.  Remote tuning is now available using the Ecutek PhoneFlash software which allows quick and simple programming via the OBD port and your Smart phone.

We will have more information on the development of these and many more new GR Yaris products on our blog and Social Media channels, but below are our initial performance upgrades.

Litchfield Stage 1 Remap – 320 BHP - with 12 month engine warranty

Our custom tuning allows power and torque to be increased from Toyota’s claimed 257bhp/265lbft to over 320bhp and 300lbft on Shell Vpower.

Our fully re-calibrated engine management system, provides significant increases to both power and torque. This customised ECU mapping uses the latest Ecutek software which we have helped develop and it releases considerably more power than standard or ‘off the shelf tunes’ and the process is straight forward and involves us installing our bespoke connect straight onto the ECU which offers fast programming or the option to revert back to standard.  

After hours of careful testing and revisions on both the road and our Maha 4WD dyno with our own GR Yaris we are able to lift power and torque figures substantially to 320 bhp (+63bhp) and 300lbft/406Nm (+35lbft/47Nm). However, these are not just peak value increases. More power is produced throughout the rev range improving drivability and offering a broader power band to enjoy.

The process takes around 1 hour and we can offer before and after power runs for an additional cost. Having worked with our own GR Yaris development cars since their launch and having spent considerable time working on the engine calibration development both the standard and aftermarket ECU we are confident in providing our Stage 1 Yaris tune with an additional 12 month engine warranty. For more information on our GR Yaris warranty package click here.

Litchfield Stage 1

Includes fitting & 12 month warranty

£795.00 exc VAT

£954.00 inc VAT

Litchfield GR Yaris 12 Month Engine Warranty

With our extensive experience with these cars since their launch we are happy to provide a comprehensive 12 month engine warranty program. Our Warranty package is aimed at road use and looks to remove the fear of expensive bills should a mechanical failure occur.

All engine components are covered so whether you have a seal, turbo or a piston failure we will be there to repair the car. We have tried to make the warranty as straight forward and comprehensive as possible.

Increase Performance with Confidence

Having owned our own GR Yaris development models since their launch we have a huge amount of experience of tuning these amazing cars and our commitment to testing and developing proven products on our own vehicles has given us an amazing reliability record even on the most highly tuned engines. We are therefore planning to extend our warranty program to cover some of our additional levels of tune (subject to our terms and conditions).

Buy & Sell with Confidence

The warranty package is also transferable (subject to our T&Cs) to the next owner so it means the car can be bought and sold with full confidence with the knowledge that Litchfield are there to support the car in the unlikely event a problem arises.

Total Peace of Mind

  • 12 month Comprehensive Engine Warranty covering all major engine components
  • Supports our popular performance upgrade packages
  • The balance of the warranty is transferable to the next owner

What isn’t covered

Full terms and conditions are provided with all GR Yaris Engine Warranty packages but in brief:

  • As the name suggests this 12 month cover starts from the time the upgrade is installed and covers the engine components only. We do not cover the clutch assembly.
  • Service parts for the engine are not covered
  • The Litchfield engine warranty is aimed at road car support and is not designed for Motorsport, trails, competition or sprint engine cover. Circuit use put additional strain on all mechanical parts and the chances of driver error are also increased. Circuit use is not covered.
  • Over revving or miss shifting is not covered. If the driver makes an error changing gear by dropping into too low a gear while down changing this will cause the engine to over rev and this can lead to engine damage. This is not covered.
  • Wear and tear items are not included
  • The vehicle must follow the Toyota service plan or have servicing completed by official Toyota dealers or at Litchfield. Litchfield will not cover engines serviced at other garages or at home.
  • The vehicle must be returned to Litchfield for the warranty inspection work to be started. The vehicle must not be worked on by another garage or the owner prior to Litchfield inspecting the car for a warranty claim.
  • In order to transfer the warranty Litchfield require an inspection of the vehicle and contact details of the new owner
  • Vehicles sold within the Motor trade will require the selling dealer to support their customers statutory rights, Litchfield do not provide trade warranties.
  • Litchfield reserve the right to decline a warranty claim

Phoneflash by Ecutek

Ecutek Phone Flash Remote Tuning

Remote Tuning now available with Ecutek Phone Flash!

We are excited to announce that we are able to offering a simple and convenient remote tuning solution for the GR Yaris using the Ecutek PhoneFlash system.

The PhoneFlash smart phone App uses Ecutek’s ECU Connect Bluetooth interface to allow you to quickly program our tuning files into the GR Yaris / GR Corolla via the OBD port anywhere in the world. The ECU Connect software will also allow the recording of Datalogs of the engine performance which can be emailed over to us for further revisions. Ideal for adjusting for your local fuel and individual upgrades.

Litchfield Black ECU Connect Bluetooth Interface

£200.00 exc VAT

£240.00 inc VAT

Litchfield Remote GR Yaris / GR Corolla Tuning

Includes Ecutek PhoneFlash License
VAT not payable for sales outside the UK

£650.00 exc VAT

£780.00 inc VAT

Syvecs Toyota GR Yaris PNP ECU Kit

A full direct fit ECU Kit without compromise.

The Syvecs Toyota GR Yaris kit brings a new level of engine management control to the GR Yaris. Designed to work from a factory car to the highest level of motorsport. We have been helping Syvecs with the development and have this powerful ECU installed in our demonstrator. With the standard ECU not able to be tuned in the short term the Syvecs offers the complete solution to owners looking to maximise the performance with an ECU which can easily be reprogrammed as additional modifications are made. The Syvecs ECU also comes with detailed data logging which allows the tuner and driver to quickly download and review how the engine is performing. The Syvecs ECU also does not bring on additional warning lights on the dash and displays the different map settings on the OE dashboard. For those cars fitted with a Flex fuel sensor to allow Ethanol to be used it even displays the Ethanol content Percentage on the instrument gauge. Litchfield are very experienced in Syvecs tuning and its GR Yaris application so we can provide a full installation and mapping service.

Read more about our GR Yaris testing with the Syvecs ECU on our website blog post.

The Syvecs plug in ECU provides the following features:

  • Live tuning of every aspect of the engine’s calibration
  • Live tuning of torque control for adjusting torque limiters and AWD operation
  • Adjustable launch control strategy based on speed, GPS or time
  • Flex fuel control with ethanol content shown on the dash
  • AWD duty / AWD temperature monitoring - Additional standalone AWD Controller also available
  • Direct injection and port Injection control
  • Electronic wastegate support
  • IMT functional
  • No cutting of factory wires or routing of cables into cabin needed.
  • Additional I/O available via 26 way header - 1 x K-Type input, 1 x GDI injector output, 1 x NTK/LSU input, 2 x CAN bus, 3 x spare outputs, RS232 connection
  • Flat foot shifting
  • Configurable engine safety trips on all important parameters: oil temperature, oil pressure, Lambda, fuel pressure and crankcase pressure
  • 64mb Built in data logging capacity using a market leading analysis software of over 8 hours worth of data, with logging sampling rates at up to 1kHz
  • Factory turbo support and aftermarket larger turbos
  • 6 Injector control with support to use any aftermarket injector
  • Rolling antilag
  • EVAP Control
  • Ability to select desired engine map, boost level, traction and launch control levels through either an external calibration switch or via OEM Cruise control buttons
  • Cruise control
  • Full VVT control
  • Closed loop lambda Control using supplied NTK Sensor
  • Pre collision and Lane Assist are NOT Supported, though DSC/Low speed collision warning system dashboard error lights are not illuminated.
  • Fully adjustable closed loop boost control with launch level adjustments and trims for turbo speed, air charge, engine coolant temp, exhaust gas temperatures etc
  • Monitor and trimming of exhaust gas temperatures
  • Anti-theft and valet modes available
  • Super fast connection via RJ45 Ethernet port for live tuning anywhere in the world or even remotely if on track if connected to a wireless unit.
  • Adjustable traction control strategies based on lateral G, GPS speed and/or individual wheel speed monitoring.
  • 4 programmable and selectable target slip maps. An immediate torque reduction can be applied by the ECU via ignition retard or a fuel cut.
  • Fuel pump control of both intake and DI pump, as well as relative fuel pressure monitoring and limiting in the event of fuel pressure dropping on boost.
  • 4 different pedal to throttle angle maps with multipliers for different parameters e.g. speed, also adjustable via steering wheel buttons
  • Configurable individual cylinder closed loop knock control, to suit any cylinder modification with adjustments to frequency, windows for listening and gains for each cylinder. Ability to trigger full cylinder shutdown in severe knock conditions.
  • Run up to 10bar map sensors
  • Change injector dead times based on voltage levels for proper control
  • Change injector end angle to ensure injection point is properly calibrated
  • Ability to fit any type of external sensor to monitor and trigger safety trips from anything from crank case pressure to damper position
  • Ability to use any size DBW throttle body e.g. Chevrolet LS7
  • Wet and dry nitrous control with ability to drive solenoids directly and control N20 heaters via pressure monitoring
  • Ability to control any external vehicle features based on sensor inputs e.g. Adjustable rear wing linked to G force or exhaust control valves
  • Connect any race series dash via spare CAN bus
  • View any input live with built in scope up to 1kHz
  • Plus much more

Syvecs Toyota GR Yaris PNP ECU Kit

Includes NTK sensor, Lead and Can bridge

£4,200.00 exc VAT

£5,040.00 inc VAT

Installation and mapping on our Maha dyno

£795.00 exc VAT

£954.00 inc VAT


Introducing the new Syvecs Toyota Yaris GR AWD module which is a standalone AWD/4WD/Centre Diff controller designed to control any AWD/4WD Solenoid/Motor to a maximum of 30 Amps via pin sharing logic.

OEM designed controllers are locked down and not adjustable, but by fitting a Syvecs AWD Controller a whole new level of control is available. The unit allows users to optimise control and provide the best stability, acceleration performance and custom control. With the use of our Scal Software, users can connect to the Device and adjust over 40 maps to adjust the control of the solenoids/motors used in the AWD systems.

The Yaris GR version of the controller replicates all the OEM CAN information as well as pick up lots of variable from the OEM Can to link into the control strategies like Steering Angle, Brake Pressure, Rpm, Tps, Lateral G, Yaw, Long G, Speeds, Temperatures and mode switches The Sport Mode Button on the Yaris is used for Map switching so allows users to be able to change between Awd Select 1, 2 and 3 which means all the maps below can be adjusted. You can also enable the burnout mode to be active when Hazards, Handbrake or external switch is active.

Key Features:

  • Over 40 maps available
  • Improved stability
  • Improved acceleration performance
  • Utilises the Yaris’ Sport Mode Button

Some of the Maps available:

  • 4 x Base Duty Tables
  • 4 x Adders with enable maps:
  • Left Foot Braking
  • Front Slip
  • Rear Slip
  • Centre Slip
  • 4 x Multipliers with enable maps
  • Steering Angle
  • AWD Temp
  • AWD Pressure
  • AWD Potentiometer
  • Tyre Diameter adjustment under sensors
  • 2WD/ Burnout Mode
  • Via Dedication Switched input
  • Via Can bus Message
  • Via OEM Functions
  • Limiters
  • Maximum Duty
  • Launch Control Limit
  • Duty Rate of Change
  • Decay/Hold Functions
  • Limp Mode
  • Over Current Protection
  • Over Slip Protection
  • Over Temp Protection
  • Cooling Pump control
  • AWD Cooling pump control logic



ITG Performance Air Filter

The ITG performance air filter is a direct replacement for the original paper air filter. The high quality foam design can be found on motorsport filters from WRC to F1 and allows the engine to breath more easily.

Compared to a brand new paper filter the ITG design allows for an additional flow at the top of the rev range with a 2-3bhp improvement but the main gain was in the area at the bottom of the rev range where the turbos is able to spool up faster. This gave a useful 10lbft improvement between 2,000rpm – 3,000rpm.

Simple to fit this washable foam filter makes future service maintence straight forward and more cost effective.

ITG Performance Air Filter

£37.50 exc VAT

£45.00 inc VAT

Turbosmart - Kompact EM Series Blow-Off Valves

The award-winning Kompact EM series Blow-Off Valves, are the world’s first truly plug and play Blow-Off Valves. Simply unplug and unbolt your OEM Blow-Off Valve, and install ours in its place. No adapters, hoses or extra assembly required. All this while retaining complete OE control of the BOV’s operation. Turbocharger performance is increased due to minimising leakage, rapid response, coupled with superior thermal performance thanks to our world-leading engineering and simulation abilities. Dual Port vents both to the atmosphere and back into the air intake.

Key Features Include:

  • Patent pending integrated pressure control
  • True plug and play upgrade
  • Integrated proprietary high-temperature solenoid valve
  • Billet construction with high-temperature o-rings
  • Available in plumb back or dual port options

Dual Port vents both to the atmosphere and back into the air intake. Suitable for the XP210 Gazoo Racing (GR) Yaris and other Toyota and Lexus vehicles.

Turbosmart EM BOV VR17 Dual Port (TS-0223-1077)

£174.90 exc VAT

£209.88 inc VAT

Turbosmart EM BOV VR17 Plumb Back (TS-0223-1277)

£164.90 exc VAT

£197.88 inc VAT

Kelford Toyota GR Yaris Upgraded Valve Springs & Retainers

The GR Yaris makes fantastic power for a standard 3 cylinder 1.6 engine but like most Japanese cars they have become increasingly popular to tune and push hard on track. This more extreme use has exposed a weakness of the standard valvetrain which can cause the failures especially at high revs. Significantly increased boost levels can also cause valve float.

We strongly recommend all customers using a tuned car on track have upgraded valve springs installed to help safeguard against these problems. Kelford’s proven solution provides a stronger valve spring and lighter Titanium retainers.


  • 100lb @ 35.0mm on intake, 198lb @ 12.0mm lift
  • 87lb @ 36.7mm on Exhaust, 178lb @ 11.5mm lift
  • Coil bind @ 22.0mm

Kelford Toyota GR Yaris Upgraded Valve Springs & Retainers

£385.00 exc VAT

£462.00 inc VAT

Installation of Kelford Upgraded Valve Springs & Retainers with oil change

£1,265.00 exc VAT

£1,518.00 inc VAT