Jimmie Johnson doesn't need a car to go fast -- the NASCAR driver is running the Boston Marathon ... and he's CRUSHING IT SO FAR ... on pace to finish right around the 3 hour mark!!
43-year-old Johnson's been training for months with the goal of breaking the 3 hour mark ... and at the time of this post, he's almost at the halfway point -- on pace for a 3:03 final time based on his splits.
What's even more amazing ... Jimmie''s never completed a marathon before!
Oh, and on Saturday, he was RACING CARS -- he competed in the Toyota Owners 400, a 300-mile race at the Richmond Raceway in Virginia.