Are most of these tables load based? (off the MAFv readings?) If there is no table to raise the g/s limit, then you'll have to "half maf" all the loads. This is common in the Subaru realm when we exceed 300 g/s. I'm getting up to about 290 g/s in my WRX, so I'm close.
I'd be curious to know if that is how (half MAFing) the uprev folks work around it. Those with supercharges and turbos are definitely exceeding that 268#.
There is probably an Open loop/closed loop logic to the ECU. In closed loop there is a constant correction being added/subtracted to maintain stoich, but when you pass a certain threshold the ECU no longer attempts to control the AFR beyond what its programmed to run. This is why you still see some people with intakes running lean up top. The ECU cannot compensate up there.
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