CLASS RACER FORUM - View Single Post - IHRA coming to my local track PBIR, Can I run in any of the classes?

Bob Don · 09-25-2009, 08:54 AM

Tweaker - You need a crash course in class racing. Classes are determined by horsepower to weight ratios. Each engine has a horsepower rating assigned by NHRA or IHRA. Each car would get a hp/weight factor depending on the listed shipping weight of each vehicle. This is what determines your class. (170 lbs driver weight is added to shipping weight to determine minimum racing weight. It doesn't matter how much you weigh.) You are then allowed to do certain modifications depending on your category. Stock can do so much, Super Stock even more. You then must be able to run on or below the ET index for your class. The problem is that you would probably not be able to run your index without building your car to the limit of the rules. (acceptable cam and valvetrain, blueprinting, gear ratio etc.). If they run a bracket program with the IHRA race, you'd be far better off there.

09-25-2009, 08:54 AM	#5
Bob Don VIP Member Join Date: Oct 2002 Location: Greater Boston Posts: 1,497 Likes: 1,135 Liked 903 Times in 192 Posts	Re: IHRA coming to my local track PBIR, Can I run in any of the classes? Tweaker - You need a crash course in class racing. Classes are determined by horsepower to weight ratios. Each engine has a horsepower rating assigned by NHRA or IHRA. Each car would get a hp/weight factor depending on the listed shipping weight of each vehicle. This is what determines your class. (170 lbs driver weight is added to shipping weight to determine minimum racing weight. It doesn't matter how much you weigh.) You are then allowed to do certain modifications depending on your category. Stock can do so much, Super Stock even more. You then must be able to run on or below the ET index for your class. The problem is that you would probably not be able to run your index without building your car to the limit of the rules. (acceptable cam and valvetrain, blueprinting, gear ratio etc.). If they run a bracket program with the IHRA race, you'd be far better off there.