Just got off the phone with Dave Buschur in Ohio and he stopped @ 38.6psi.... The car just put down 685WHP and 571FTQ!!! I still have 2-3 psi to go but plan on keeping that in my front pocket for a rainy day in Mexico...That is the highest amount of WHP put on that dyno other than a 42R. These guys know what they are doing!
FWIW - Dave's car put down 650?WHP and 500?FTQ on the same dyno and went 9.65 @ 151.41
It just broke the straight pump gas record for an Evo. On 93 octane alone (no meth) it made 600WHP and 443FTQ! The TQ curve is insane, it was making 425FTQ@ 4800RPM's and and 432FTQ @ 7500! It should go 140MPH on pump alone in the 1/4.
This was all done on Buschur's Mustang Dyno.