The conversion I'm using has been in circulation/use for 15+ years (not just by me). They are also the same on 1993-1996 ECU of which I have mapped around 400, and all variants UK, WRX, RA, STI. All figures quoted online for these ECU types are based on this conversion.
Your method gives low values. If you applied this to a stock ECU the values would be too low. I'll do the math later.
What gear are you logging in, as it need to be a good 3rd/4th gear pull to get close to target boost. 2nd will under achieve.
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