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- MP5T / 944
See, you really need to do your homework on the MS6 before posting stuff like this. I am not saying that it didn't run lean, but, for every single big turbo MS6, they are running leaner than 11.5:1 AFR at stock boost. This is a VERY conservative number, most MS6's take out fuel in order to make power at stock boost.
So lets say you are correct and I don't know what I'm talking about.
You say that the car was running on "Conservative Boost", Unless you are a Mazda Teck, you have no real baseline to decide that it is conservative.
Everyone thought that Ten PSI was conservative for the MSP in 2004 where actually, Stock boost was almost the total limit of the motor.
I'm not pretending to know the MS6 inside and out, Neither should you IMHO.
You installed a much larger turbo without compensating the tune for it and it failed the motor. I think it's a real shame, I wish it just worked for you but this is the reality of tuning. You are not the first and will not be the last. I stand by my original post that it was likely lean compounded by the mismatched Turbo/Tune.
The stock ECU pulls fuel to make power is what you are saying, that makes perfect sense, and it kinna works to my advantage here in this discussion. If Mazda leans out the car to make power, then what you basically did was lean it out a bit more for it. I think that you might have gotten a bad engine that was going to eventually fail, perhaps it was weak to begin with, but now your stuck with a rebuild, I can't wait to see the final product.