Indy car
Indianapolis
Indiana is home to the indy 500 races in speedway indiana
IRL for Indy Racing
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Rahal-Letterman
Auto-regulation
Rahal-Letterman
Yes
The Indy 500
No, it is not. Indy is a colloquial proper noun, an abbreviation for the city of Indianapolis, Indiana. An "Indy car" is a type of racing car for auto races as nominally held at Indianapolis Motor Speedway (who hold the trademark). *NOTE: the spelling "indie" is the slang term used for independent filmmaking.
technically, the race is held in Speedway, Indiana...
The most commonly used for the word car in Hebrew is "Mechonit" (מכונית). Another word you can use is "Oto"/"Auto" (אוטו).