absolutely first class!!!
Too bad you guys don't have an actual "lean burn indicator" like mine, but I run a JDM ecu - 37820-p2j-j62 it's amazing to know for sure you're in lean burn for real. check my "happy light" lean burn indicator:
that way you know for sure, even when your foot feels a little heavy:
on the p2j's, the lean burn indicator comes from pin a30 (which most pinouts call unused), and it's a switched ground. I bring ignition switched 12v+ to the other side of the bulb.
one downside to this setup is NO OBD ANYTHING! I have to use the jumper under the passenger kick-panel and look up codes when necessary, but I do have my dual vtec motor and lean burn ( best of both worlds )! I can lean burn in 12v and 16v mode ( I'm pretty sure your d15z1 will as well with correct ecu and conditions), but I also have the "wild cam" mode, almost B-series type vtec action but it starts at about 5000 rpm to redline (I've had it to 7800 without fuel cutoff) Which would have most ecomodders shaking their heads!!
If you want to go for a quick ride, I can show you:
Lean burn - YouTube