Build featured: Tim's Toyota A90 Supra GT4+ Development Car
Written by: Ridgeline Motorsport Team
Every product we develop begins the same way. Not on a computer screen or in a showroom — but on track.
So what does a properly developed Toyota A90 Supra track aero package look like when it's validated on real race tracks rather than developed for appearance alone? For Ridgeline Motorsport, the answer starts with Tim's Toyota A90 Supra — the primary development platform for the Ridgeline Motorsport A90 Supra GT4+ Aero Kit. Every component — from the front splitter and canards to the 1600 mm rear wing, hood vent, and RS roof fin — has been shaped through real-world testing, lap after lap.
Rather than building an A90 Supra around individual cosmetic upgrades, the goal was a balanced aerodynamic system for track driving and Time Attack — refined through repeated track testing rather than a single test session or photoshoot.
GT4+ Aero Kit at a Glance
- Development car: Tim's Toyota A90 Supra, running stock turbo & factory transmission
- Platform: Toyota GR Supra A90/A91
- Track tires: 275-width 200TW tires
- Lap times: 1:33.962 at WeatherTech Raceway Laguna Seca · 1:49.132 at Buttonwillow Raceway CW13
- Core aero: GT4+ Front Lip, Tunneled Front Splitter, Canards, 1600 mm Rear Wing, Hood Vent, RS Roof Fin
- Engineered as: One integrated aero system — not standalone parts
Why Tim's A90 Supra Is the Development Car
Aero is hard to validate from a computer model or a static install alone. The real test starts when a car is driven repeatedly at speed — where driver feedback, vehicle behavior, and lap-time performance tell you what a spec sheet can't.
A front splitter, rear wing, canards, hood vent, and roof fin don't operate independently. Change one end of the car and you shift balance at the other, especially as speed climbs. That's why the GT4+ Aero Kit was developed as a complete system, not a parts list — and why Tim's Supra has carried the whole program from the beginning.
The Complete GT4+ Aero Package
The featured Toyota GR Supra A90 runs the complete Ridgeline Motorsport GT4+ aerodynamic package, combining front-end aero, splitter-based airflow management, rear downforce, and airflow control over the roofline. The Toyota Supra aero collection brings together the components developed for the A90/A91 platform, with this car representing the full configuration.
The objective was never to add more hardware. It was to build a predictable, balanced A90 Supra track setup that works as speed increases and holds up across different corners and track layouts. The goal is simple: make the car faster without compromising the balance that makes the aero package usable on track.
A90 Supra GT4+ Aero Components
GT4+ Front Lip
The reinforced GT4+ Front Lip forms the foundation of the front aero package, integrating with the Tunneled Splitter below it to create a cleaner airflow transition while keeping an OEM-inspired look rather than functioning as a standalone styling piece.
GT4+ Tunneled Front Splitter
The one-piece molded tunnel manages airflow beneath the vehicle while providing a rigid platform for the front aero package. Paired with the front lip, it's designed to generate additional front-end aerodynamic load during medium- and high-speed driving while holding up to repeated track use. The GT4+ Splitter Kit for Toyota A90 Supra is the corresponding front splitter package.
GT4+ Canards
The canards extend the front package by managing airflow around the front corners. They're not there just to look aggressive — they're developed to complement the splitter and lip, helping refine front-end response and stability during high-speed track driving. The GT4+ Canards for Toyota A90 Supra are designed as part of the same aero package.
GT4+ 1600 mm Rear Wing
The redesigned mounting system was built specifically for the Toyota A90/A91 platform, designed to generate greater rear aerodynamic load than the factory GR Supra GT4 wing while also addressing the water-intrusion concerns associated with traditional GT4-style wing installations.
Rear aero matters most in how it works with the front: added rear load needs to complement the front package, not overpower it. That balance is why the wing was developed alongside every other component rather than on its own. The GT4+ 1600 mm Rear Wing for Toyota A90/A91 Supra is the rear aero solution on the development car.
GT4+ Hood Vent
The enlarged vent gives hot air a dedicated exit and reduces high-pressure air trapped under the hood — supporting engine-bay heat extraction while also contributing to the front-end aerodynamic strategy. On a track car, cooling and aero aren't separate problems; airflow through the front of the car affects both. The GT4+ Hood Vent for Toyota A90 Supra is another piece of the complete system.
GT4+ RS Roof Fin
Inspired by the Porsche 992 GT3 RS, the roof fin helps manage airflow from the roof toward the rear wing, promoting cleaner, more consistent airflow toward the rear of the vehicle at speed. The GT4+ RS Roof Fin for Toyota A90 Supra completes the upper portion of the system.
Proven at Laguna Seca and Buttonwillow
Performance claims mean very little without real-world results — and the most important part of this program has always happened away from the workshop.
Tim's A90 Supra has been tested at WeatherTech Raceway Laguna Seca in Monterey, California and Buttonwillow Raceway Park in California, two very different environments for evaluating a track car. Laguna Seca is an 11-turn, 2.238-mile road course known for the Corkscrew and significant elevation change; Buttonwillow's CW13 configuration mixes low-, medium-, and high-speed corners. Testing across both gives a more useful picture than relying on one track or one type of corner.
On 275-width 200TW tires, running a stock turbocharger and factory transmission, the development car has recorded:
- 1:33.962 — WeatherTech Raceway Laguna Seca
- 1:49.132 — Buttonwillow Raceway CW13
Aero alone didn't produce these numbers — the development car is a complete chassis package, including suspension, brakes, tires, and setup work alongside the aerodynamics. These are development-car lap times, not isolated aero-test results. What they show is what the complete package can do before the next powertrain phase begins. For us, this is only the beginning.
Built Around Performance: Suspension, Brakes, and Driver Interface
Aero only works when the rest of the car can support it.
The development car runs Pit Garage Spec Nitron R3 coilovers, giving the chassis adjustability needed to tune for different circuits and aero loads, and the Paragon Track Performance Big Brake Kit (PA035 6-Piston), providing the consistency required for repeated high-performance sessions.
Inside the cockpit, the car uses a JQ Werks GEN 2 Racing Steering Wheel System, giving the driver a purpose-built motorsport interface suited to the car's track-focused setup.
Together, these systems let the car make full use of the aero package — predictable under braking, stable through high-speed corners, and responsive enough to exploit the added front and rear load.
Why Build an Aero System Around a Track Car?
The A90 Supra has become a popular platform for track days, road racing, and Time Attack builds, but aero upgrades are usually bought as individual parts. The GT4+ program takes a different approach: instead of asking whether a splitter, wing, or canard looks aggressive enough on its own, development asks how the whole car behaves when they're all used together — testing the relationship between:
- Front splitter: front-end load and airflow management
- Canards: front-corner airflow and response
- Hood vent: engine-bay airflow and pressure management
- Rear wing: rear load and high-speed stability
- Roof fin: airflow delivery to the rear wing
- Suspension: chassis control under increased aero load
That's the difference between installing aero parts on an A90 Supra and developing an aerodynamic system for one.
The Next Chapter
Development never truly ends. During this testing phase, Tim's Supra has run a stock turbocharger and factory transmission — the next stage introduces a larger turbocharger and built transmission. More power changes what the chassis, tires, brakes, and aero package all have to handle, and with the GT4+ system already validated on track, this next phase lets us see how the car responds when real power enters the equation.
The goal was never just horsepower. It's to build a faster, more complete A90 Supra Time Attack car — and products our customers can trust on the street and the track.
We're excited to see what comes next. Because every lap teaches us something new, and the GT4+ program is just getting started.
Frequently Asked Questions
What is the Toyota A90 Supra GT4+ Aero Kit?
The Ridgeline Motorsport A90 Supra GT4+ Aero Kit is a track-focused aerodynamic system developed for the Toyota GR Supra A90/A91 platform. The featured development car uses the GT4+ Front Lip, Tunneled Front Splitter, Canards, 1600 mm Rear Wing, Hood Vent, and RS Roof Fin as an integrated package.
Is the A90 Supra GT4+ Aero Kit designed for Time Attack?
Yes. The GT4+ platform was developed around track driving and Time Attack applications. Tim's Toyota A90 Supra serves as the primary development car, with components evaluated through real-world testing at tracks including WeatherTech Raceway Laguna Seca and Buttonwillow Raceway Park.
What makes the A90 Supra GT4+ Aero Kit different from a typical A90 Supra aero kit?
The GT4+ Aero Kit was developed as an integrated aerodynamic system rather than a collection of standalone exterior parts. The front splitter, canards, hood vent, rear wing, and RS roof fin were developed around the same A90 Supra development car and evaluated through real-world track testing.
What front splitter does the A90 Supra GT4+ development car use?
The development car uses the Ridgeline Motorsport GT4+ Tunneled Front Splitter, paired with the GT4+ Front Lip as the complete front aerodynamic package.
How large is the A90 Supra GT4+ rear wing, and what does it improve?
The GT4+ Rear Wing uses a 1600 mm wing profile with a mounting system developed specifically for the A90/A91 platform. It is designed to provide increased rear aerodynamic load while addressing the water-intrusion concerns associated with traditional GT4-style installations.
What tires were used for the A90 Supra GT4+ lap times?
The reported lap times were recorded on 275-width 200TW tires, an important part of the testing context when evaluating track performance.
What lap time did the development car run at Laguna Seca?
The A90 Supra GT4+ development car recorded a 1:33.962 at WeatherTech Raceway Laguna Seca on 275-width 200TW tires, with a stock turbocharger and factory transmission.
What lap time did the development car run at Buttonwillow?
The development car recorded a 1:49.132 at Buttonwillow Raceway CW13 on 275-width 200TW tires with the stock turbocharger and factory transmission. The car also finished second place at the Global Time Attack Finals at Buttonwillow CW13.
What suspension and brakes does the development car use?
The car runs Pit Garage Spec Nitron R3 coilovers for chassis tuning and the Paragon Track Performance Big Brake Kit (PA035 6-Piston) for repeated high-performance braking.
Is the A90 Supra GT4+ development car running a built engine or transmission?
Not yet. During the featured testing phase it ran a stock turbocharger and factory transmission. The next development phase adds a larger turbocharger and built transmission.
Is the GT4+ Aero Kit suitable for a street-driven A90 Supra?
It was developed primarily for track-focused driving and Time Attack applications. Individual components can work on street-driven A90/A91 Supras, but the complete system is built for drivers wanting a more performance-oriented setup.