【完全解析】なぜ250馬力のGR86が420馬力のFDに食らいつけるのか？現代のNAが旧世代ターボに肉薄する峠アタックの裏側【VIDEO OPTION切り抜き】

Summary

The video explains why a modern 250-horsepower Toyota GR86 can post nearly the same lap time as a much more powerful 420-horsepower Mazda RX-7 FD (FD3S) on the technical Arashiyama mountain pass road in Kyoto.

Key comparison (lap time on Arashiyama)

• FD (Fujita Engineering): 1:13.033
• SARD GR86 (Third/third damper setup): 1:13.090
• Difference: 0.057 seconds

Why the GR86 stays competitive despite less power

• The course is not a long high-speed straight-track; it’s a low-to-medium speed, corner-heavy route where maintaining momentum matters more than peak horsepower.
• The GR86’s naturally aspirated engine provides linear, immediate throttle response, helping the driver accelerate precisely after turning.
• The GR86 also emphasizes handling, including a “Third Damper” suspension feel and carefully tuned components to stay stable through corners.

What limits the FD on this type of road

• Even with 420 hp, there are few long full-throttle sections where the turbo’s advantage fully dominates.
• Turbocharged setups can introduce lag between throttle changes, making fine control harder on a technical mountain pass where small corrections determine lap time.

Ride / Setup and Driving Evaluation

GR86 side

The GR86 is described as largely stock, but with targeted tuning:

• Air cleaner/exhaust changes, including a prototype catalytic converter
• ECU adjustments
• Front lip spoiler and a Rila GT wing
• Adjustable coilovers
• Testing and discussion of the “Third Damper”, including how it performs with different stiffness/ride characteristics

Drivers describe the car as feeling grippy, sharp, and stable, with strong traction and predictable behavior—“like a racing car.”

FD side

The FD3S is presented as a heavily tuned customer/shop car by Fujita Engineering (“Demon King of the Mountain Pass”).

Custom parts and focus include:

• A new turbocharger (GBC35700) to promote stronger response from lower RPMs
• F09Pro suspension
• Feed calipers with FD rotors

The core tuning idea is that boost/torque arrives at the right time to maximize traction exiting corners without overwhelming rear grip (i.e., too much boost too early would cause slip).

Overall conclusion

On Arashiyama, the video argues that the GR86’s lightweight balance, immediate throttle behavior, and responsive suspension let it effectively neutralize the FD’s horsepower advantage. Both cars are framed as capable “mountain pass masters,” with the FD still excellent—but less dominant specifically in a corner-and-momentum-focused environment.

Presenters / Sources (from the subtitles)

• Quintilian (quoted concept about describing rather than simply stating)
• Channel V (video option/clipping channel)
• Third (referenced for GR86 customization / “Third Damper”)
• Fujita Engineering (FD3S preparation)
• SARD (referenced with the GR86 naming)