Tom, thanks, hopefully it is clear.
TB
Certainly, larger displacement and compression ratios change this equation, I can work out the compression impact by translating it into boost equivalent, it will just take sometime (and energy
).
The larger displacement will proportionally increase these numbers i.e. 3.746/3.6 ltrs= about 5.5% more. Compression has a direct impact on the numbers, this is the main reason N/A engines have better BMEP, other than the rest of the hardware, and finally twin plug also impacts these numbers, how much I cannot tell, but certainly does. All in all I would think that a 10-12% improvement is easily very likely in your engine, with all the above, a higher compression and GT2 EVO heads and cams.
The air measurement and its relation to torque has been discussed before, it is the BSAC that I sometimes refer to, for our engines, about 8.5 hp/lb/min of air..