well i know the arx MUST be tune differently as from factory it runs a few psi extra.. and who knows if nissan advanced abit of timing to compensate for the extra ass...
seeing as i've got a wideband in maybe me n scott will also figure this one out. but im starting to think it may have something to do with the fuel map as Cihan cant tune the car under 3000rpm when in third, as if he floors it it will kick down to first and jump off the dyno..
so it could also be a possbility that the low end fuel map is muck, as mine does strange things according to the wideband, but once it gets to 3000rpm, ratio sits at about 12v and everything hammers