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The Performance Index of an upgraded Koenigsegg One:1 in Forza Horizon 3

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 401-500 501-600 601-700
A 501-600 601-700 701-800
S 601-700 701-800
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 and Forza Motorsport 7 do not have Launch ratings.
  • In the Horizon series, there are no cars ranked X 999 by default.

References

  1. "Performance Index and Classes" . forzamotorsport.net . Retrieved 12-01-2018.