Kremer,
We usualy have a fly-in tuner frm hks japan once a year where evrybody would literaly line-up. When I got the rex, oem ecu was non-existant. As such, currently im just driving it safe'ish w/out being too spirited, albeit the rex only showing less than half its potential. . But more than twice fuel-guggling ability!
:-S

Oh btw, is it possible this fuelling problem caused by incorrect plumbing? I always notice smell of fuel coming frm the engine . . .this aggravating the tuning prob as well. . .compounding it.