[Ice88]

The situation posed on facebook is around Fuel + Compression.

Compression ratio is simply an indication of how much smaller the compressed area is at TDC as opposed to BDC. I.e. the area for an 9:1 is 9 times smaller then BDC.

As you increase compression you either need to increase the octane rating of the fuel you are using or increase the amount of fuel (as a semi work around). This is due the increase in temperature. In a turbo engine this is a two fold problem as compressed air is hotter (hence intercoolers). Higher temperatures = more likely to ping.

The more air you cram in the higher your AFR will be. The higher the AFR the more likely you are to ping.

There's alot more to it and im simplifying a bit but am trying to answer the question without losing people. I can expand the above if peeps are interested...

EDIT: ok so didn't quite answer the question. A bpt ecu will inject alot more fuel then a BP ecu to compensate for boost. In theory a BPT compression + BPT ecu will make more power then a BP compression + BPT ecu. I'd argue that the latter is a better combination however.