Toyota GR Yaris (G16E-GTS) Hydrogen Carbon Cleaning in Miyagi

孝一田﨑
4 days ago
5 min read

We recently had the pleasure of performing a Hydrogen Carbon Cleaning service on a customer's beautiful Toyota GR Yaris!

This high-performance hot hatch came in with approximately 74,300 kilometers on the odometer. Under the hood is Toyota’s pride: the G16E-GTS型, a 1,618cc in-line 3-cylinder intercooled turbo engine.

As you may know, this newly developed, compact, lightweight, and high-spec powerplant puts out an impressive 272 ps (200 kW) at 6,500 rpm and 37.7 kg・m (370 N・m) of torque between 3,000 and 4,600 rpm. It utilizes Toyota's advanced D-4ST (Direct & Port Fuel Injection System). The GR Yaris is already legendary for its dominance in the WRC (World Rally Championship) and the All Japan Rally Championship!

Event Update: This specific engine refresh service was performed at the 2026 GR Yaris Owners Meeting in Jibusaka Kogen Ski Resort in Miyagi. The owner chose this service as proactive maintenance to ensure the longevity and peak performance of their high-power engine.

The Hydrogen Carbon Cleaning Process

Before starting the injection, we conducted a thorough pre-check of the engine sound, vibration levels, and exhaust output. Once everything was verified, we began the hydrogen gas input.

We initiated the process at a safe flow rate of 100 L/h, carefully monitoring the engine's real-time condition. As the engine responded positively, we gradually increased the hydrogen volume to optimize the carbon removal process.

Scroll down to see the live results! ↓↓↓ [In-Progress Impressions & Results]

宮城県トヨタ GRヤリス・G16E-GTS型水素ガスカーボンクリーニング施工実施 — 宮城県・水素ガスカーボンクリーニングを受けたトヨタGRヤリス。

[In-Progress Impressions] ↓↓↓

Here is a detailed, minute-by-minute breakdown of how the G16E-GTS engine responded to the hydrogen carbon cleaning treatment:

5 Minutes In: Placing a hand near the exhaust tailpipe, we noticed a slight hint of moisture beginning to form. While the exhaust pressure itself felt solid, there was a minor, irregular fluctuation in the exhaust flow. We gave the throttle a quick rev to check responsiveness—as the revs dropped back down, the RPM gauge needle showed a very slight, temporary flutter before settling. We proceeded carefully, keeping a close eye on these initial symptoms.
10 Minutes In: Water vapor visibly started drifting out of the exhaust tip—a clear sign that the hydrogen was binding with the carbon deposits and burning them off cleanly. We gradually adjusted the hydrogen flow rate based on the engine's real-time feedback.
25 Minutes In: A noticeable change occurred. The mechanical engine noise and cabin vibrations began to quiet down significantly. With the engine responding beautifully, we locked in the optimal hydrogen injection volume to maintain this sweet spot.
45 Minutes In: Checking the exhaust flow again, the minor fluctuation we noticed earlier was completely gone. The airflow felt remarkably smooth and consistent. We revved the engine once more to check the RPM gauge: the slight needle flutter upon returning to idle had completely disappeared. The idle was now rock-solid.
55 Minutes In: The moisture at the exhaust tip began to dry up, signaling that the heavy carbon breakdown phase was wrapping up. We made final micro-adjustments to the hydrogen delivery.
60 Minutes (Completion): At the 1-hour mark, the engine idle, sound, vibration, and exhaust flow were all perfectly stable and smooth. The engine felt completely refreshed, and the service was successfully completed!

[Post-Service Review & Customer Feedback] ↓↓↓

💬 [Post-Service Review & Customer Feedback] ↓↓↓

A few days after the event, we received this amazing feedback from the GR Yaris owner:

"On my drive home, my average fuel economy reached numbers I have never seen since I started driving this car!"
"The engine feels like it revs much smoother than before."
"I can swear the exhaust note sounds deeper and better now."

We are absolutely thrilled that the owner could feel the immediate benefits of the treatment!

💡 Why Hydrogen Carbon Cleaning Works: The Mechanics Behind the Power

Carbon buildup harms engine performance and condition far more than most people realize.

By removing stubborn carbon deposits from the intake valves, pistons, and especially the exhaust valves, we also clean out a significant amount of grime inside the exhaust system. This drastically improves exhaust efficiency.

When exhaust efficiency goes up, it creates a stronger scavenging effect, drawing in more fresh air. This leads to:

Enhanced Combustion Efficiency: The fuel burns cleaner and more completely.
Improved Power & Torque: The engine produces power effortlessly.

The incredible boost in fuel economy the customer experienced is a direct result of this improved combustion efficiency. Because the engine now produces more power and torque with less effort, you don't have to step on the gas pedal as hard as before (reduced throttle opening).

Thank You!

When you refresh your engine, your car truly rewards you on the road. In many cases, the effects become even more noticeable after driving a few more miles, so we hope the owner continues to enjoy the evolving performance!

It was an honor meeting you, and we look forward to seeing you again at future events. Thank you so much for choosing our service. If you ever need anything, please feel free to reach out.

Keep on enjoying your refreshed GR Yaris!