As we know, the revolutionary 1969 Dodge Daytona was the first NASCAR to crack the 200 mph barrier. Not long after that, NASCAR imposed restrictor plates to reduce the top speed of these cars. However, in June 2004, Rusty Wallace was given the unique chance to sample how fast an unrestricted stock car could really go. In a private test for NASCAR sponsor Nextel at Talladega, Wallace was asked to help evaluate radio communications at higher speeds. At first, his Penske Racing Dodge ran at 199 mph, but there was an issue- the team had brought the wrong restrictor plates. Wallace, clearly not shy of an adventure, urged the crew to pull the plate completely. On his next run, the car screamed past the start/finish line at what Wallace recalled in Speed Sport as a staggering 241 mph, averaging 238 mph around the 2.66-mile oval before vibrations shredded his right-side tires. Others cited the car's top speed at 228 mph, but either way, while unofficial, it was a number that obliterated Elliott's 1987 record and also offered a glimpse into what was possible had restrictor plates never been implemented. This run raises a tantalizing question in 2025: What could a modern NASCAR car, armed with today's technology, achieve without restrictions? According to Earnhardt Childress Racing's technical director Andrew Randolph, via Engine Builder, improvements in materials, tolerances, and design mean today's naturally aspirated motors can generate more than 850 horsepower unrestricted. Compare that to Elliott's 625-hp Thunderbird, and it's clear the potential leap is enormous. Looking back on his derestricted run, Wallace mused, "Can you imagine what they could do now?" It's a rhetorical question that leaves NASCAR officials quietly relieved that we'll never find out.
LOL at the stated output of 625hp. NASCAR teams are as honest about how much actual power they produce as are modern women when talking of their "body counts." From Google: 2004: Cup engines were producing nearly 1,000 horsepower and revving over 10,000 RPM in unrestricted form. One engine tested from this era made 733 hp on a dyno, two decades later. 900hp has been around where they have been for decades. They have also been failing to accurately report actual power levels for decades.
