ANSWERS: 4
  • Based on various web sites by the race teams themselves, the engines put out between 750 and 775 hp.
  • NASCAR engines produce about 775hp without a restrictor plate and 400hp with a restrictor plate
  • With unrestricted motors: Previous to the 9500 RPM rev limit rule, NASCAR Nextel Cup engines were producing close to 900 flywheel horsepower. This is when they were spinning up to 10,100 RPMs. Of course, the best teams were making this horsepower, and the independent/small teams were a bit behind. Here is an approximation of horsepower numbers produced over the years: 2004: 875 (or more) fwhp 2003: 840 fwhp / 750 rwhp 2002: 825 fwhp / 735 rwhp 1998: 750 rwhp / 680 rwhp All of this data is based on post-race dyno testing posted on jayski.com. All of the teams tend to underestimate and keep their real horsepower numbers a secret (which is why most sites tend to say no more than 800 horsepower). With restricted motors: 420-450 flywheel horsepower, depending on the size of the restrictor plate.
  • Nascar cars have well over 90000000000 horsepower

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