Forza Horizon 6: Best Upgrades for the GR GT Prototype

Core Performance Upgrades

1. Race Weight Reduction – Cutting weight is your first priority. Less mass improves acceleration, braking, and cornering all at once.
2. Race Anti-Roll Bars (Front & Rear) – These are essential for tuning out understeer and giving the car a sharper turn-in at high speeds.
3. Race Differential – Fine-tune power delivery to manage the 850+ Nm of torque from the hybrid V8. Crucial for both cornering and traction out of bends.
4. Race Suspension – Gives full control over camber, ride height, and stiffness. Perfect for tailoring the GR GT to any track layout.

S1 Class Circuit Build (Handling Focused)

If you want the car to dominate S1 class races (PI ~900), focus on precision and handling:

• Tires: Keep stock semi-slicks but increase rear width for extra grip.
• Aero: Race rear wing adds downforce. You lose a bit of top speed, but cornering stability improves massively.
• Engine: Upgrade intake and exhaust first—adds power while shaving off weight.

This build is ideal for twisty tracks where the GR GT can shine without hitting top-end speed limits.

S2 Class Speed Build (Power Focused)

To push past 200 mph (320 km/h) and move into S2 class sprints:

• Engine Swap: Consider a 5.7L V8 or high-output V12 for a better power-to-PI ratio.
• Aspiration: Upgrade the twin-turbos to Race spec to maximize high-end speed; the hybrid still handles low-end torque.
• Transmission: Race 7-speed lets you tune gear ratios to avoid bogging down in long straights.

This setup is all about raw speed, perfect for open circuits and drag-heavy challenges.

Quick Tuning Tips for the GR GT

These starting points give you a stable baseline. From there, adjust according to track type, driving style, or S1/S2 goals.

With the right upgrades, the GR GT Prototype can be a corner-carving monster in S1 or a top-speed rocket in S2. Focus on weight, handling, and smart power delivery—and you’ll see lap times drop across the board.