Dustin just finished up testing for today.. Hope you guys like what you see! :-D
Ok, here's some numbers and notes, remember this is a stock truck, stock exhaust, no headers, stock throttle body, stock MAF, etc. Also using stock lower pulley.
4.0" SC pulley, 20deg's timing, 12:1 AF, 517rwhp/564rwtrq. Dyno cell is hot, 98deg F. Peak boost, 18.9 @ 5500. 14.5 @ 3000rpm.
3.75" SC pulley, 20deg timing, 12:1 AF, 558rwhp/609rwtrq. Dyno cell, 102deg F. I'm out of MAF, need to install MAFia. Peak boost, 21.1 @ 5500rpm. 16.5 @ 3000rpm.
Some notes, 4.0" pegs the meter right at 5300rpm. 3.75 pegs at approx. 4700rpm. Were running 104 octane gas to eliminate possibility of detonation. Timing is set to 20 from 4500-5500. 3000rpm has 14.
There's so much left on it right now, SC is got so much more. Forgot to mention, this is the standard pressure ratio SC, tomorrow is the HPR which is better at teh 19+psi.