Finally got on a dyno today. There were issues with the electrical signal hookup so torque would not properly display on an RPM graph, though I saw 540ftlbs before it disappeared once (which seems in the right ballpark). I'll find another dyno at some point. A Whipple Stage 2 on this same dyno made 666/539 (Whipple Tune). The shop owner said its the highest pump gas S550 he has had. He had another Procharger car he brought up that made 644/539 @ 13psi so I'm pretty happy with the results at 11psi.
Pulls are to 7300rpm with 7500rpm soft limiter.
https://www.youtube.com/watch?v=uwhkAGvNDRQ&feature=youtu.be
Pulls are to 7300rpm with 7500rpm soft limiter.
https://www.youtube.com/watch?v=uwhkAGvNDRQ&feature=youtu.be