Oh yes of course I have the boost valve--I think all 901/902's have it because SF's crappy priming system never works all that well. So you fire and engine and have to run and open the boost valve and then close it. I've only ever had it prime a handful of times with out assistance. Oh and yes I've replaced the mechanical seal now 4 times in it's 11 years of use. The boost valve only seems to make a difference on smaller less powerful engines at least that I can notice. Oh and thinking back to EMC testing days--When the contest RPM was 2500-6500 I would always choose a smallblock and this dyno always struggled with 430+ tq @ 2450-2500 rpm.

Would you mind looking through some of your past tests of large cube combos and sharing your data and thoughts especially about the lower RPM end of the scale. I really think this unit should be capable of performing a pull from 3800-6000 rpm without any issue. I could be wrong though. I do remember being very impressed my first time at EMC (2009) with how easily the DTS could pull down our 471 TR to 2300-2400--and remember thinking "Our brandnew 902 couldn't do that I don't think" Thanks for the help guys. Maybe I should change the thread title to SF-902 Dyno Saga--since the engine has been flawless and the dyno has not. LOL J.Rob