Toyota GR Yaris Tuning Guide

Toyota GR Yaris Tuning Guide

The Toyota GR Yaris has taken the motoring world by storm. Its potent 1.6-litre three-cylinder engine and rally-bred chassis make it a thrilling car straight from the factory. However, for many, the desire for more power is irresistible. This guide will explore the key considerations when tuning your GR Yaris.

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Tuning Stages:

GR Yaris tuning generally progresses through stages, each requiring different levels of modification.

• Stage 1: This typically involves an ECU remap. The GR Yaris ECU is now programmable, making this a much simpler process than in the early days when aftermarket ECUs (like Syvecs or Motec) were the only option. A Stage 1 remap optimizes the existing engine parameters for increased power and improved throttle response. Expect gains in both horsepower and torque without needing any hardware changes.
• Stage 2: At this point, supporting modifications become necessary to maximize the benefits of the remap. A free-flowing exhaust system (cat-back or turbo-back) and an uprated air intake are common upgrades. These modifications help the engine breathe more efficiently.
• Stage 3 and Beyond: Beyond Stage 2, further hardware upgrades are required to achieve significant power increases. This can include a larger turbocharger, upgraded intercooler, fuel injectors, and a high-pressure fuel pump. At these higher stages, a custom tune is essential to ensure everything works in harmony.

Please note - Stage tuning is only used in these guides, as exactly that, a guide. Stage tuning has often been referred to as an easy way to describe certain "levels" of tuning, and the hardware/software required to reach that stage.

Power Limits and Engine Internals:

A sensible limit for the stock engine internals is around 340bhp. Pushing beyond this figure significantly increases the risk of engine damage. If your power goals exceed this, forging the engine internals (pistons, connecting rods) is a must. This strengthens the engine to handle the increased stresses of higher power outputs.

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Valve Float and Upgraded Valvetrain:

One issue that has emerged with tuned GR Yarises is "valve float" at higher RPMs. This occurs when the valve springs can no longer control the valves effectively, leading to power loss and potential engine damage. Replacing the valve springs resolves this issue. When doing so, it's highly recommended to replace the camshafts as well. Kelford camshafts are a popular choice for GR Yaris tuning. Upgrading the valvetrain is a crucial step when aiming for higher RPMs and increased power.

Check out all available GR Yaris Kelford Camshafts products here

ECU Tuning:

As mentioned, the GR Yaris ECU is now programmable. This simplifies the tuning process significantly. A professional tuner can adjust parameters like fuel delivery, ignition timing, and boost pressure to optimize performance. Choosing a reputable tuner with experience in GR Yaris tuning is crucial for safe and reliable results.

Conclusion:

Tuning a GR Yaris can unlock its true potential. By understanding the different tuning stages, respecting the limits of the stock engine components, and addressing potential issues like valve float, you can enjoy a significantly enhanced driving experience. Remember to prioritize reliability and work with experienced tuners to ensure your GR Yaris remains a thrilling and dependable machine.