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1. B4001 (injector flow rate) I re-scaled this table for the Radix injectors with return-less rails, although the 2006 Radix Superchips tune that I found has this table set at 5.250 in all cells. Which way should this tabled be set?
I would recommend a return fuel system with a manifold referenced FPR, otherwise you don't have enough axis on B4001 to cover boost (axis does not go negative).
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3. I'm nervous about turning with the LS2 knock sensors. I copied B6226 and B6227 from a 4.3L tune, set B1402 to Flat response, modified B6244. Without repining the ECM to the flat response pin locations I register knock. I am going to re-pin to pin 9 and 10 and see what happens.
I don't know the answer here... you may have to do some experiments.