[PrematureApex]

Originally Posted by zenmaster

Basing it on the published BHP for M235i, M2, and M4. And the JB4 results from M235i and M4. The published BHP for M2 is right between the two. Common sense says the turbo cfm (and fueling) should scale to target hp.

That's common sense? Random, unsupported linear interpolation comparing completely different engines? Not all of BMW's turbo motors have the same headroom for gains from a tune. See, for example, the N54 vs. N55, or the S55 vs. the N55, etc. You just can't blindly scale up like that.

How about we look at what we know, from a technical standpoint?

If you know anything about these engines, you know the turbo size is the limiting factor on the N55 from the M235i.

If the M2 is using the same small turbo, you're going to be similarly limited in output without swapping it out. AKA, a tuned M235 N55 and a tuned M2 N55 may very well be very similar, and nowhere near the numbers you're throwing around. Again, that turbo just doesn't have much headroom left in it.

The M3/4s twin turbo setup has MUCH more headroom as far as aftermarket gains go. It's huge aftermarket potential is completely irrelevant to the discussion.

If you're assuming the M2 will see 400-450 whp on a tune-only, you're assuming that it has a larger turbo vs. the 235. That may very well be true and I'm sure we're all hoping for it...but we have no evidence of that at this point.

One would think BMW would have mentioned a larger turbo, since they took the time to list all the other engine improvements vs. the regular N55. But alas, they didn't...

Couldn't that be telling of a carry-over snail?