A restrictor plate limits engine airflow to reduce horsepower. Officials install plates between the carburetor and intake. Smaller openings restrict air entering the engine. Reduced airflow lowers overall engine power output. Cars rely more on drafting at high speed. Pack racing becomes common under restricted conditions. Drivers stay close to maintain momentum. For example cars formed tight packs on a superspeedway. That grouping resulted from reduced engine power. Teams adjust gearing for restricted performance levels. Smooth throttle control prevents momentum loss. Reduced horsepower increases strategic drafting importance.
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