Why is it that if you are playing in career mode, if you buy a car and upgrade it in any way, you can’t race it. It says that the car is illegal in that race multiple times. I Remember in previous Forza games, if you upgraded a car, it would allow you to be in certain races.
From the FAQ pinned at the top of the forum:
FM6 FAQ: Stories of Motorsport
Forums: Events List thread - with list of eligible and non-eligible cars for each Volume
Restrictions for each series are not shown but you can determine them by opening one, selecting Buy Cars, and seeing where each car PI is, or buy entering with a low PI stock car which will prompt you to upgrade, and selecting Manual Upgrade will show the PI limit. If you see an “Illegal Car” message you will have to remove upgrades on your car to reduce the PI to make it legal. Buying cars from this menu includes automatically selected upgrade parts to bring the car to the top of the restriction limit; alternately you can back out of the event and go to the main menu Buy Cars list, buy a car stock, and then upgrade it to your preference. Note that some series have a PI restriction lower than the maximum for that class, so some downloaded tuning setups won’t be eligible. Opponent Drivatars in Stories of Motorsport are upgraded to the top of the event restriction and do not adjust down based on the player’s chosen car, so using a stock car will be less competitive.
Class maximum PI thresholds: E300 | D400 | C500 | B600 | A700 | S800 | R900 | P998 | X999
Stories of Motorsport Volumes and Series restrictions
Click links or scroll down to see eligible cars for each Volume.
Volume 1 - Super Street
Japanese Street Kings, class: C500
Compact Sport Coupe, class: D400
Hot Hatchbacks, class: D400
Ultimate SpoCom, class: B600
Rally Day Heroes, class: C500
Classic Compact, class: E300Volume 2 - Sports Icons
Ultimate Sport Machines, class: A660
Modern Sport Legends, class: B600
Executive Heavyweights, class: A650
Track Toys, class: A700
Sport Utility Juggernauts, class: C500
Historic American Muscle, class: D400Volume 3 - Grand Touring
Modern Hypercar, class: R880
Sport GT, class: S750
Exotic GT, class: S800
Birth of the Supercar, class: S800
Ultimate Grand Tourer, class: S750
Vintage Touring, class: D400Volume 4 - Professional Racing
Modern GT Racing, class: R865
V8 Supercars, class: S800
Early GT Racing, class: R850
Global Touring Cars, class: S800
Formula E, class: S750
Historic Sportscar Racing, class: A675 Volume 5 - Ultimate Motorsport
Endurance Prototypes, class: P998
Legends of Grand Prix, class: S775
Can-Am, class: R855
IndyCar, class: X999
1970s Grand Prix, class: R900
Modern Grand Prix, class: X999
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