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I don't follow your post, sorry.
The msd btm retards timing under boost, that's usually a good thing, you'll probably end up doing the same thing with the megasquirt - but what does that have to do with psi?
Please also remember that 10psi on a CT26 is not comparable to 10psi on a T3/T4.
Yes, with a T3/T4 you could easily overwork the 315cc injectors. The 7M turbo injectors are low impedance and I think from 1990 on they were side feed. Why not use the drop in (top feed, high impedance) RX-7 denso's that come in the 460cc and 550cc flavors and save yourself some trouble? I don't know the part numbers off the top of my head, but I'm sure they're somewhere on this site.
The megasquirt can do A LOT for you, much more than just retarding timing and adjusting fuel curves. Their site is really pretty good, go check out the software and get an idea of all the features you'll be able to tune with.
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