A "restrictor plate" is a device used in motorsports that limits the amount of air and fuel that can enter an engine. It helps keep the vehicles slower and safer by reducing their power output. Full definition
But with new rear spoiler rails, a higher rear spoiler and smaller carburetor restrictor plates for today's race - the green flag drops at 11 a.m. - it's going to be tougher for drivers to lose control. (articles.orlandosentinel.com)
While the unpredictable nature of the racing and the inability for anyone to hold the top spot for any more than a handful of laps, the 2013 500 felt like a NASCAR restrictor plate race. (sbnation.com)
«NASCAR requires restrictor plates on superspeedways to limit performance, and the restrictors used in ALMS are similar in principle,» Rice continued. (corvetteracing.com)