General Requirements

Below you will find several excerpts from the real American Iron racing handbook, along with further explanation or clarification to their implementation in Forza Motorsports:



No artificial aspiration is allowed in AI-class races unless you are racing with a 4-cylinder or 6-cylinder engine. (Examples: The 1987 Buick GNX may keep its turbocharger, but the 2010 Mustang GT500 is illegal for AI competition. It but may compete in AIX, though.) If there is a process to remove a supercharger or a turbo charger, and the power to weight ratio is met, a normally artificially-asperated car may compete in AI-class events.

As Forza Motorsports does not allow you to chose a brand of tire, the set tire for AI will be the "Sport" selection to mimic the real series' use of the Toyo Proxes RA-1. This tire, in the real world is grooved and is in fact D.O.T. legal to drive on public roads. The RA-1 may be grooved though it has a lot of grip considering what it is, giving the "Sport" tire compound (in grip and visual appearance in Forza Motorsports) many of the same characteristics.

In the case of modern vehicles (like the SRT-8 vehicles, or 2010 Camaro SS) with standard 18+" rims, an exception will be made to the maximum wheel size requirements, but no further plus-sizing is allowed. All other vehicles must abide by the 18" wheel diameter maximum.



To be clear, AI cars cannot use "Race" brakes, though AIX may.



Again, AI-class vehicles cannot use a "Race" transmission, though they may use "Race" clutches, drivelines, and differentials. AIX may use all "Race" powertrain upgrades.



Instead of the burden of proof (that TCS is disabled) being the competitor's responsibility, TCS and STM will be turned "off" in the race lobby. This is a series where traction control devices won't be used, so car control will play a large role in your sucess or failure.



As the "Race Oil and Cooling" upgrade in Forza Motorsports is described as a dry-sump oil system, it is not allowed for AI-Class racers. It is allowed on AIX-class cars.