Speaking as a m2 owner, I am irritated looking at the graph.
1) N55 and B58 put down identical top end. You will think N55’s maxed out small turbo should spool faster as a tradeoff and make better low end torque. Well, it didn’t happen - B58 has longer stroke and higher compression ratio, which significantly helps down low when pressure isn’t built up.
2) Higher compression ratio means greater timing pull at high PSI and thus less efficient power and less tuneability. Well, it didn’t happen - B58 works just as fine at 15psi as N55.
3) Longer stroke means less free revving. Well, it didn’t happen, B58 rev all the way up to 7K rpm, nothing less than N55.
I would like to thank you for using RON99 so the N55 torque didn’t fall on your graph as much as we saw it does elsewhere.
Now you better tell me the 2 dyno weren't performed the same day please
