Dave Walker, at a PPC in the park show, in Mallory Park near you this weekend, mapped mine, no closed loop, it's a waste of time, unless you have a cat that needs it.
DW's just bought a LS6 powered RX7, 7L and twin turbo's as a project, 1200bhp, hoping to get a drive, I offered yesterday, but cars no where near finished yet, time!!
Dave mapped mine to perfection, I have a low setting on the ecu for wet weather where boost comes in much slower/lower.
tabetha