RM Engineering GT4+ Hood Vent For TOYOTA A90 SUPRA

CFD-Developed. Track-Proven. Engineered Beyond the GT4 Rulebook. The Ridgeline Motorsport GT4+ Time Attack Aero Kit is our most comprehensive aerodynamic package for the Toyota GR Supra A90/A91 platform. Inspired by the aerodynamic architecture of the Toyota GR Supra GT4 race car, the GT4+ system applies the same competition-focused philosophy without being restricted by the original GT4 rulebook. Each component has been developed through CFD analysis, real-world track testing, and competition experience to increase usable aerodynamic load and improve high-speed vehicle stability. The complete package integrates the reinforced GT4+ Front Lip, Tunneled Front Splitter, Canards, Rear Wing, Hood Vent, and Roof Fin into a unified aerodynamic system for serious track-day drivers and time attack competitors. Vehicle Fitment Designed for: Toyota GR Supra A90/A91 Please confirm your vehicle year, front-bumper configuration, hood configuration, and competition-class requirements before ordering. GT4+ Hood Vent The Ridgeline Motorsport GT4+ Hood Vent is inspired by the functional vent geometry used on the Toyota GR Supra GT4 race car, while featuring a larger extraction area developed for more demanding track and time attack applications. Unlike conventional flat hood vents, the GT4+ Hood Vent uses a pronounced recessed outlet positioned within a localized low-pressure region identified through CFD analysis. The resulting pressure differential helps draw hot, high-pressure air from the engine bay into the external airflow above the hood. Aerodynamic Design Advantages Upstream Gurney Flap Initiates localized airflow separation ahead of the recessed outlet, helping establish a favorable pressure condition over the vent. Recessed Extraction Zone Positions the opening below the external shear layer and protects it from direct airflow stagnation. Organized External Flow Path External streamlines remain established above and downstream of the recessed outlet, creating an organized flow path that supports entrainment and carries extracted engine-bay air rearwar CFD Flow Analysis The surface-relative-velocity field shows a pronounced velocity gradient across the recessed Hood Vent opening. Faster external airflow remains established above and around the outlet, while the recessed cavity contains lower-speed separated flow. This pattern is consistent with a shear layer forming across the opening, supporting the extraction of hot, high-pressure engine-bay air into the external flow. Near-surface streamlines further illustrate how airflow is organized across and downstream of the recessed vent region. Rather than creating a large stagnation zone ahead of the opening, the external airflow continues downstream over the outlet, supporting the intended extraction mechanism. Together, the recessed outlet and upstream Gurney flap position the GT4+ Hood Vent within a favorable external flow field, supporting more effective extraction of engine-bay heat and pressure during sustained track use. The external-flow visualizations support the intended extraction mechanism but do not independently quantify engine-bay mass flow or the resulting change in front-end lift. Hood Vent Features High-gloss pre-preg dry carbon-fiber construction Larger extraction area than the OEM GT4 configuration GT4-inspired recessed outlet geometry Positioned within a localized low-pressure region identified through CFD Integrated upstream Gurney flap Designed to improve engine-bay heat evacuation Helps relieve pressure beneath the hood Supports improved thermal management during sustained track use May help reduce pressure-induced front-end lift at speed Track-tested for practical heat-extraction performance Designed to complement the complete GT4+ front aero system