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TIPS & SOLUTIONS
There are a couple ways that I am aware of to SOLVE the PROBLEM.
1. Run in open loop like me
Unplug the first O2 sensor on the exhaust manifold/downpipe. The car will run like CRAP and your air fuel ratios will be way off. A lot of tuning will get it working again and boosting happily. This method works because the ECU just runs a preprogrammed map because there is NO O2 signal.
2. Run an O2 faker
Miata's need to do this. I havn't done this but know it can be done.
How it works is the O2 sensor is still plugged in but when boost is detected the O2 sensor give out a stable voltage. This stable voltage will force the ecu to give out just enough fuel for that voltage. You can tune this because the a/f ratio isn't dynamic anymore. Tuning like this will go MUCH faster and you won't toss check engine lights if you care about that at all.
3. Only Tune WOT
Give up and only tune the WOT part of the map. From what I can assume GReddy's turbo kits are tuned like this. NO partial throttle boost tuning! BEWARE! This is risky but is the simplest of the 3 solutions. I would never do this personally.
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