Forza Horizon 6 Hidden Engine Guide: Why Audi R8 LMS 5.2L V10 Is Secretly Overpowered?

Forza Horizon 6 boasts a vast vehicle customization system, and among the components crucial for tuning and modification is the engine.

Sometimes, an engine can deliver unimaginable performance. In the game, there's an engine many players are unaware of that can achieve this - 5.2L V10 from Audi R8 LMS (2009), often simply referred to as Audi R8 LMS.

Next, I will detail this remarkable engine.

Performance Underestimated by PI System

PI system in Forza Horizon 6 is the core mechanism for vehicle classification. All vehicles are categorized into different levels, such as D, C, B, A, S1, and S2, based on their PI values.

PI value is determined by the game's built-in AI driver after track testing. This value determines the race category a vehicle can compete in and limits the player's available modification options.

However, this seemingly rigorous system has a fatal blind spot - it cannot accurately assess the true performance of certain engines under extreme conditions.

Specifically, PI score is calculated based on "performance statistics", rather than directly on power-to-weight ratio or lateral G-force.

This means that when an engine exhibits performance exceeding its "paper statistics," PI system cannot capture this information, resulting in a "low score" rating for a vehicle equipped with that engine that does not reflect its true performance.

For example, Audi R8 LMS has a listed horsepower of only 643 in the game, and the in-game performance chart only shows up to 9,000 rpm.

On paper, this engine seems unremarkable. However, when players rev the engine to 9,400 to 9,500 rpm, in-game telemetry data reveals that its actual output exceeds 700 horsepower - far surpassing many engines with higher PI scores in the game.

Reason for its Obscurity

You might wonder, if this 5.2L V10 engine is so powerful, why has it been so rarely discovered by players?

Firstly, and as mentioned above, FH 6 engine swapping system has a flaw in its performance index (PI) detection, causing many enthusiasts to completely underestimate this engine and exclude it from their vehicle modification or tuning options.

However, this isn't the fundamental reason. The fundamental reason is that the engine swapping option is limited to Audi models.

Within FH 6 engine swapping system, not all engines can be installed in every vehicle; the swap options depend on factors such as the model, body type, and drivetrain layout.

In fact, this 5.2-liter V10 engine can be swapped into several Audi R8 models, including 2016 Audi R8 V10 Plus.

For example, some enthusiasts have tested this car and found that after swapping in 5.2L V10 engine, PI value actually decreased, while the car's weight decreased by 80 kg and horsepower increased by 41. Therefore, this enthusiast traded a lower PI value for greater performance, which is precisely the value of this engine.

In comparison, while the most common Racing V12 engine in the game is also a transplant option that can efficiently utilize PI range, it still falls short of this special V10 in terms of weight reduction and power curve characteristics.

However, the problem is that Audi cars aren't exactly "popular" in FH 6's vast vehicle roster. Aside from R8 series, most Audi models perform only moderately well in their class of racing.

This means that even if a player stumbles upon this engine, they might not find it particularly useful, let alone consider further tuning it.

Modification and Driving Strategies

Now that we know the power of this engine, how do we utilize it to win races?

Modification

First, you need an Audi car that supports this engine, then acquire and use the engine using Forza Horizon 6 Credits. If you don't have an Audi car, you can also obtain it with Credits.

Next comes the modification. As is generally acknowledged in the gaming community: in FH 6, the essence of modification is maximizing PWR and lateral G-forces within PI constraints, while simultaneously optimizing aerodynamic and mechanical balance through tuning.

The Audi R8 LMS's weakness lies in its low-end torque and relatively mediocre acceleration response. To address this, a enthusiast has shared a modification solution: installing a 10-speed Race Transmission.

In FH 6 physics, the number of gears directly affects the vehicle's utilization of the engine's power range during acceleration. More gears mean closer gear ratios, allowing the engine to enter its peak power window above 9,400 rpm more frequently.

While some enthusiasts might see 10-speed Race Transmission increasing shift time, for this particular V10 engine, the benefits far outweigh the costs - each shift allows the engine to return to its optimal operating range with its "hidden horsepower".

Besides Transmission, you can also use Rally Tires to increase lateral G-force, install Forza Aero to adjust downforce, and use a softer front and stiffer rear spring setup with specific anti-roll bars to optimize cornering dynamics.

Operation

It's worth noting that this modification requires a high level of driving skill.

Because the game's Automatic Transmission logic shifts gears based on 9,000 rpm "redline", it doesn't reach the actual power delivery point of 9,500 rpm. Therefore, the engine's full potential can only be realized through manual control.

In other words, if you rely on automatic operation, the automatic transmission, and the in-game power curve, you'll find it difficult to unleash the engine's true power. However, manual control is the essence of racing games, so it's time to return to manual!

This concludes the detailed introduction to 5.2L V10 engine in Audi R8 LMS (2009) in Forza Horizon 6. If you're interested in this engine, why not try it out in the game yourself?