Day Two: NASCAR Preseason Thunder At Daytona International Speedway
Second Day Features Adjustments To Rules Package
DAYTONA BEACH, Fla. (Jan. 13, 2012) — As with any test, especially one as important as 2012 Preseason Thunder at Daytona, getting it right and being open to make adjustments is key.
After the late afternoon practice session on Thursday, NASCAR announced changes for today’s test session with an increase in the diameter of restrictor-plate openings from 1/32nd of an inch to 15/16ths inches, adding an estimated 26 horsepower to the engines.
In addition, they lowered the pressure relief valve settings from 30 pounds per square inch to 25 psi and narrowed the grille openings of the cars, thereby decreasing airflow to the engine. Both measures were designed to decrease the number of laps one car can push another without overheating.

