
The fastest car in Forza Horizon 5, in terms of pure top speed, is the 2019 Rimac C_Two (now known as the Rimac Nevera). On the game's long highway stretch, a fully upgraded Rimac C_Two can reliably hit speeds exceeding 270 mph (435 km/h). Its Immediate power delivery and all-wheel-drive system provide incredible acceleration off the line, making it not just a top-speed king but also brutally quick. However, "fastest" can be interpreted differently. If you mean the quickest car around a circuit, the 2018 Senna is often the top choice for its superior cornering and braking.
Achieving these extreme speeds requires more than just owning the car. It involves significant tuning. You'll need to install all available engine and platform upgrades to maximize horsepower and minimize drag. The final drive ratio in the transmission must be adjusted for top speed, which often sacrifices acceleration. For the Rimac, this means a tuning setup focused on high gears and minimal downforce.
| Vehicle | Approximate Max Tuned Top Speed | Key Strengths | Weaknesses |
|---|---|---|---|
| 2019 Rimac C_Two | 270+ mph (435+ km/h) | Instant electric torque, AWD grip | Heavy, poor cornering at high speed |
| 2010 Mosler MT900S | 265+ mph (426+ km/h) | Excellent power-to-weight ratio, stable | Difficult to obtain (Barn Find) |
| 2018 Lamborghini Aventador SVJ | 260+ mph (418+ km/h) | Powerful V12 engine, exotic appeal | Rear-wheel drive can be twitchy |
| 2012 Hennessey Venom GT | 260+ mph (418+ km/h) | Extremely lightweight, high-revving engine | Very difficult to control at limit |
| 2016 Lamborghini Centenario LP 770-4 | 258+ mph (415+ km/h) | Great all-around performance, good grip | Expensive in the Autoshow |
Remember, top speed is just one measure of performance. For most races, a balanced car like the Koenigsegg Jesko or the McLaren Senna, which excels in acceleration, braking, and cornering, will actually be "faster" and more effective.

For straight-line speed, you want the Rimac C_Two. That electric hypercar is just insane. I've tuned mine for the highway and it pulls like a rocket past 260 mph without breaking a sweat. It's almost too easy. But if you're talking about a car that's fast everywhere—on a track, through the jungle, you name it—the Senna is the real deal. It sticks to the road like glue. The Rimac is a one-trick pony for speed traps; the Senna wins you races.

The fastest cars in FH5 are typically the ones with the highest Horsepower (HP) and a tuning setup optimized for low drag. Based on community time trials and speed trap records, the top contenders are the Rimac C_Two for all-out top speed and the Jesko for incredible acceleration that also leads to a very high terminal velocity. The Jesko can be a handful to control, but its power is undeniable. Success depends heavily on a proper tune; downloading a popular "speed" tune from the community creations is a great first step.

As a player who loves pushing the limits on the main highway, I've tested all the so-called "fastest" cars. The Rimac is the definitive answer for a top speed run. The process is key: you need a long run-up from the southern interchange. I found a specific gear ratio tune online that made the difference between hitting 268 mph and breaking the 270 mph barrier. It’s not just about the car; it’s about the set-up and the execution of the run itself. The feeling of seeing the speedometer go that high is unreal.

It's a fascinating battle, really. The Rimac C_Two represents the electric future, using instant torque and complex software to achieve its speed with relative stability. In contrast, cars like the Hennessey Venom GT rely on a monstrous gasoline engine in an ultra-lightweight chassis, a more traditional but wildly powerful approach. The Rimac's all-wheel-drive system gives it a massive advantage off the line, while the lighter gasoline cars might have a higher potential top speed if you can manage their raw, mechanical nature. The "fastest" car depends on which engineering philosophy you find more compelling.


