The Yaris GR – Stage Tuning

Nothing Beats This On Track!

Introduction
JF Automotive is a leading automotive ECU remapping and tuning company specialising in optimizing vehicle performance. In this case study, we explore the results of our ECU remapping efforts on the Toyota Yaris GR, a powerful 4WD sub-1,280KG hot hatch.

Yaris GR Stock findings

257HP out of the box is already very impressive for a 4WD sub-1,280KG hot hatch. That being said, we couldn’t resist pushing more out of this 1.6 3-pot! When we run the car stock on our dyno, we found Toyota were actually being conservative with their figures! We saw power peaking at 263 HP and 374 Nm Torque! Although another 6 HP over the quoted factory figures isn’t huge, nobody is complaining about getting more than expected!

Dyno Data Logs

At JF Automotive, we take pride in our meticulous approach to custom tuning. Our purpose-built dyno development center is where we painstakingly fine-tune and perfect every aspect of the tune. Our process involves the following steps:

1. Data Logging: During the initial dyno runs, we thoroughly data log various engine parameters. This data serves as a foundation for our subsequent tuning efforts.
2. Comparison and Analysis: With the data in hand, we meticulously compare the stock programming in the engine ECU with our data logs. This step allows us to identify areas for improvement and helps us to craft a tailored solution.
3. Base Tune Development: Using the insights gained from the data logs, we create a base tune and test it on the Yaris GR. This iterative process continues as we monitor and log the engine’s performance to ensure safety and reliability.
4. Fine-Tuning and Optimization: This stage involves countless hours of fine-tuning the ECU’s parameters until we achieve a healthy and efficient balance between performance and safety. Our ultimate goal is to deliver the power we aimed for without compromising the engine’s reliability

In conclusion, our work on the Toyota Yaris GR has demonstrated the significant potential for improving performance through ECU remapping. By leveraging our expertise, purpose-built dyno facility, and dedication to precision tuning, we were able to unleash additional power and torque, exceeding the manufacturer’s quoted figures. At JF Automotive, we are committed to helping our customers unlock the full potential of their vehicles while maintaining the utmost attention to safety and performance.

JFA310 Package – 300-310BHP / 400Nm

• JFA Engine Tune
• Intake Kit – Eventuri in this study.
• GPF Back Exhaust – Milltek in this study.

JFA330 Package – 325-335BHP / 430Nm

• JFA Engine Tune
• Intake Kit – Eventuri in this study.
• GPF and Cat Delete – Milltek in this study.
• GPF Back Exhaust – Milltek in this study.

JFA370 Package – 370-375BHP / 500-515Nm

• JFA Engine Tune
• Intake Kit – Eventuri in this study.
• GPF and Cat Delete – Milltek in this study.
• GPF Back Exhaust – Milltek in this study.
• Camshaft & Valve Spring Upgrade.

JFA400 Package – 500BHP / 530Nm

• COMING SOON

JFA Extras

Suspension

We are running Eibach springs on ours which lowers the front by 30mm and 25mm on the rear. This lowers the overall centre of gravity and removes some of the body roll for track use. The overall ride is still very disciplined for road use too.

Lower Seat

The drivers seat sits very high and we felt this was too high for anyone over 5ft 7. We now have fitted a lower seat rail that puts you right behind the wheel. The Toyota height and slide adjustment still work to get the perfect driving position.

Oil

We are running Liqui Moly Ceratec engine protection along with either Liqui Moly or Rowe engine oil. For the track day we was running Rowe Oil with a genuine oil filter. All work carried out in our workshops.