Even if that were true (which it isn't) you really don't want to be running your injectors at anywhere near 100% duty cycle if you can help it. Besides which, there's no point running stock Supra turbos at 1.5bar as they're way past their peak efficiency at that kind of pressure - they're just making lots of heat and not giving you any more power than they would at 1.2 - 1.25 bar, probably less.
Not unless you also want the lagtastic UK turbos too. Just BPU your j-car to 1.2 bar and forget it, enjoy the extra torque and faster spool, and be happy. You won't regret it.