If the RX-8 engine is running really rich, what are the drawbacks to having it eventually leaned out? Shouldn't we have more HP and better fuel economy? Sounds a bit contradictory, is it possible?

yes, this is precisely what we're waiting for with an ECU reflash/ chip replacement.

it's been there from square one.

Now are we hoping this reflash / replacement will be Mazda provided or is it most likely going to be aftermarket. I am hoping Mazda recognizes and does it, so that our warranty's are intact.

Also how much can we hope to gain from leaning out the mixture?

Originally posted by tminus3
Also how much can we hope to gain from leaning out the mixture?

completely speculatory. at most?? 12-15 is probably the best you could do (bumping it back up to the 240 flywheel hp range).