Actually it was 638 HP at the crank built and dynoed by Keith Craft Racing. After we did they chassis dyno pulls we found out the single stage clutch was slipping. The best we finally got that day was 463 HP but Keith agreed a dual stage clutch should take it over 500 hp. I sold the car a couple years ago but thought the dyno pull sounded pretty good anyway.
crazy as balls
Devil46209 4 years ago
That's not 638 at the crank. My SPF had 550 at the crank and made 440 at the wheels. Pretty consistant for parasitic loss on a SPF
SteveHandlebar 5 years ago
Actually it was 638 HP at the crank built and dynoed by Keith Craft Racing. After we did they chassis dyno pulls we found out the single stage clutch was slipping. The best we finally got that day was 463 HP but Keith agreed a dual stage clutch should take it over 500 hp. I sold the car a couple years ago but thought the dyno pull sounded pretty good anyway.
gsharapa 5 years ago
It did sound very good. I also have a black SPF, with a Roush 427R that dynos 465 to the wheels. Naturally I am trying to find another 50 hp... :-)
jtarwalker 4 years ago