Originally posted by neon_duke
Nigma, did you actually see your horsepower number rise after washing the car? I don't believe that washing the car affects the HP number. However, 'wearing in', as the car gets a few miles on it, does actually increase the HP for a while.
Originally posted by Dolbytone
Oops, wrong thread... here, I'll be useful:
F090/S
880.7 miles (well broken in)
Last oil change was just before the R11 Endurance I just ran.
Last car wash was just before the R11 Endurance I just ran.
HP: 702
HP after carwash: 702
HP after oil change: 711
Supports the theory that car wash does not affect HP directly.