The Performance Index - abbreviated as P.I. or PI - is a car performance measuring system featured in Forza Motorsport 2 and all subsequent titles.
Factors[]
The Performance Index evaluates five performance factors scored from 3.0 to 10.0 and assigns a car an alphanumeric performance class starting from 0 and capping at 999 or 1000. Classes group similar cars together, allowing race events to permit entry to certain cars to enable a competitive environment.
- Speed evaluates top speed determined by engine performance and transmission gearing.
- Handling evaluates maximum cornering speeds determined by lateral G force values at 60 mph (97 km/h) and 120 mph (193 km/h).
- Acceleration evaluates acceleration to top speed determined by 0 to 60 mph (97 km/h) and 100 mph (161 km/h) times.
- Launch evaluates acceleration from a standstill determined by 0 to 60 mph (97 km/h) and 100 mph (161 km/h) times.
- Braking evaluates braking distances determined by braking distances required for 60 mph (97 km/h) and 100 mph (161 km/h) to 0.
- Class evaluates overall performance determined by a car's lap time on a simulated test track.[1]
Classes[]
Xbox 360[]
| Class | Forza Motorsport 2 | Forza Motorsport 3 | Forza Motorsport 4 | Forza Horizon |
|---|---|---|---|---|
| F | 100-200 | 100-200 | ||
| E | 201-275 | 201-275 | 100-200 | |
| D | 0-400 | 276-350 | 276-350 | 201-300 |
| C | 401-550 | 351-425 | 351-425 | 301-400 |
| B | 551-700 | 426-500 | 426-500 | 401-500 |
| A | 701-850 | 501-600 | 501-600 | 501-600 |
| S | 851-998 | 601-700 | 601-700 | 601-700 |
| R3 | 701-800 | 701-800 | 701-800 | |
| R2 | 801-900 | 801-875 | 801-900 | |
| R1 | 901-999 | 876-998 | 901-999 | |
| U/X | 999 | 1000 | 999 |
Xbox One & Windows 10[]
| Class | Forza Motorsport 5 | Motorsport Series | Horizon Series |
|---|---|---|---|
| E | 100-300 | ||
| D | 100-400 | 301-400 | 100-500 |
| C | 401-500 | 401-500 | 501-600 |
| B | 501-600 | 501-600 | 601-700 |
| A | 601-700 | 601-700 | 701-800 |
| S | 701-800 | 701-800 | |
| S1 | 801-900 | ||
| S2 | 901-998 | ||
| R | 801-900 | 801-900 | |
| P | 901-998 | 901-998 | |
| X | 999 | 999 | 999 |
Notes[]
- Performance Index values can be altered by applying Upgrades to cars but cannot be changed by custom tunes.
- Forza Motorsport 6, Forza Motorsport 7 and Forza Motorsport (2023) do not have Launch ratings.
- In the Horizon series, there are no cars ranked X 999 by default.
References[]
- ↑ "Performance Index and Classes" . forzamotorsport.net . Retrieved 12-01-2018.