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.
Tim's Toyota A90 Supra serves as the primary development platform for the Ridgeline Motorsport GT4+ Aero Kit, playing a critical role in refining the aerodynamic package through real-world testing and continuous iteration. Every lap, setup change, and data point has helped shape the GT4+ package into what it is today.
GT4+ Aero Kit at a Glance
- Development platform: Tim's Toyota A90 Supra, running stock turbo & factory transmission
- Lap times (275-width 200TW tires): 1:33 at Laguna Seca · 1:50 at Buttonwillow CW13
- Core components: Front Lip, Tunneled Splitter, Canards, 1600 mm Rear Wing, Hood Vent, RS Roof Fin
- Engineered as: One integrated aero system — not standalone parts
The Complete A90 Supra GT4+ Aero Package
The car is equipped with the complete Ridgeline Motorsport A90 Supra GT4+ Kit, developed as a complete aerodynamic system for track-focused and Time Attack applications. The Toyota Supra aero collection brings together the aerodynamic components developed for the A90/A91 platform, including the GT4+ front and rear aero components featured on this development car.
Rather than designing individual components in isolation, the GT4+ system was engineered as a complete aerodynamic package. The front lip, tunneled splitter, canards, rear wing, hood vent, and roof fin are developed to work together as a balanced aerodynamic system for braking, high-speed corners, and corner exit.
Every component exists for one reason—to make the car faster.
A90 Supra GT4+ Aero Components
The GT4+ program was developed as a complete aerodynamic system, with each component engineered to complement the next. The result is a cohesive Toyota GR Supra A90 GT4+ aero setup rather than a collection of unrelated components.
GT4+ Front Lip
The reinforced GT4+ Front Lip serves as the foundation of the front aero package. Designed to integrate with the Tunneled Splitter, it creates a cleaner aerodynamic transition while maintaining an aggressive OEM-inspired appearance.
GT4+ Tunneled Front Splitter
The GT4+ Tunneled Splitter features a one-piece molded tunnel that improves airflow management beneath the vehicle. Working together with the front lip, it increases chassis rigidity and generates meaningful front-end downforce during medium- and high-speed driving. The Ridgeline Motorsport GT4+ Splitter Kit for Toyota A90 Supra is the corresponding front splitter package developed for this platform.
GT4+ Canards
Developed specifically for the GT4+ platform, the canards complement the complete front aero system by improving front-end aerodynamic response, stability, and turn-in confidence during track driving. The Ridgeline Motorsport GT4+ Canards for Toyota A90 Supra are designed as part of the same GT4+ aerodynamic package.
GT4+ Rear Wing
The GT4+ Rear Wing utilizes a redesigned mounting system and a larger 1600 mm wing profile, producing significantly more rear downforce than the factory GR Supra GT4 wing while reducing the water intrusion concerns associated with traditional GT4 wing installations. The Ridgeline Motorsport GT4+ Wing for Toyota A90/A91 Supra was developed specifically around the A90/A91 platform.
GT4+ Hood Vent
The enlarged hood vent improves engine bay heat extraction while reducing high-pressure air beneath the hood, helping both cooling efficiency and front-end aerodynamic performance. The Ridgeline Motorsport GT4+ Hood Vent for Toyota A90 Supra forms another part of the development car's integrated aero system.
GT4+ RS Roof Fin
Inspired by the Porsche 992 GT3 RS, the GT4+ RS Roof Fin helps guide airflow from the roof toward the rear wing, promoting cleaner airflow and more consistent rear-wing efficiency at speed. The Ridgeline Motorsport GT4+ RS Roof Fin for Toyota A90 Supra extends the GT4+ aerodynamic system onto the roofline.
Proven at Laguna Seca and Buttonwillow
Performance claims mean very little without real-world results.
Running a stock turbocharger and factory transmission, the GT4+ development car has already demonstrated what a properly engineered aerodynamic package can achieve through track testing.
On 275-width 200TW tires, the car has recorded:
- WeatherTech Raceway Laguna Seca — 1:33
- Buttonwillow Raceway CW13 — 1:50
These lap times were achieved without upgraded engine internals or transmission modifications, highlighting the effectiveness of the complete chassis, suspension, brake, and aerodynamic package.
For us, this is only the beginning.
Built Around Performance
Supporting the GT4+ aero system is a carefully selected collection of motorsport hardware designed to complement the aerodynamic package and track-focused setup.
Braking duties are handled by Paragon Brakes, providing the consistency and confidence required for repeated high-speed sessions.
The suspension is built around Pit Garage Spec Nitron R3 coilovers, allowing precise chassis tuning for different circuits while maintaining excellent mechanical grip and stability.
Inside the cockpit, the car is equipped with a JQ Werks GEN 2 Racing Steering Wheel System, giving the driver direct access to essential vehicle controls through a purpose-built motorsport interface. The system complements the development car's track-focused setup while creating a more connected and intuitive driving environment.
Every component has been chosen to complement the aerodynamic package, creating a balanced car that is predictable, confidence-inspiring, and capable of extracting maximum performance from relatively modest power.
The Next Chapter
Development never truly ends.
The next phase for Tim's Supra is already underway. With the aerodynamic package now thoroughly validated through track testing, attention turns toward increasing power.
The car will soon receive a larger turbocharger along with a built transmission, unlocking the next level of performance and allowing us to explore the full potential of the GT4+ platform.
The goal isn't simply to make more horsepower.
It's to build a faster, more complete Time Attack car while continuing to develop products that our customers can trust on both the street and the racetrack.
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 A90 Supra GT4+ Aero Kit?
The Ridgeline Motorsport A90 Supra GT4+ Aero Kit is a complete aerodynamic system developed for the Toyota A90 Supra platform. The featured development setup includes a GT4+ Front Lip, Tunneled Front Splitter, Canards, Rear Wing, Hood Vent, and RS Roof Fin.
Is the A90 Supra GT4+ kit designed for Time Attack?
Yes. The GT4+ platform was developed and tested around track-focused driving and Time Attack applications. Tim's A90 Supra serves as the primary development car, allowing the aerodynamic package to be refined through real-world track testing.
What front splitter is used on the A90 Supra GT4+ development car?
The car uses the Ridgeline Motorsport GT4+ Tunneled Front Splitter, paired with the GT4+ Front Lip as part of the complete front aerodynamic package.
How large is the A90 Supra GT4+ rear wing?
The GT4+ Rear Wing uses a 1600 mm wing profile and a redesigned mounting system developed for the Toyota A90/A91 Supra platform.
What suspension does the A90 Supra GT4+ development car use?
The development car runs Pit Garage Spec Nitron R3 coilovers, allowing precise chassis tuning for different circuits while maintaining mechanical grip and stability.
What brakes are used on this A90 Supra track build?
The car uses the Paragon Track Performance Big Brake Kit (PA035 6-Piston) for the Toyota GR Supra A90/A91, providing the braking consistency required for repeated high-performance track sessions.
What lap times has the A90 Supra GT4+ development car recorded?
On 275-width 200TW tires, the development car has recorded a 1:33 at WeatherTech Raceway Laguna Seca and a 1:50 at Buttonwillow Raceway CW13, while running a stock turbocharger and factory transmission.
Is the A90 Supra GT4+ development car running a built engine or transmission?
At the time of the featured testing, the car was running a stock turbocharger and factory transmission. The next development phase will add a larger turbocharger and built transmission.