[PrematureApex]

Originally Posted by zenmaster

Take a look at historical precedent. 10% whp gain for each platform is the norm. A different turbo for each hp target is the norm. If an M235i turbo was used for this application, it'd be near the top of its operating range.

10% is the norm? Do tell!

Let's see...N54 and N55 (let's use the normal version) are both rated at 300 bhp.

The N54 has MUCH MORE headroom in the stock turbos. On a tune only, the N54 is good for 80+ whp. Much more on full bolt ons (stock snails are good for 500ish bhp). The N55 is good for about 60 whp, and maxes out quickly after that. Nowhere near one another in potential. And both of them are more than 10% whp gain. More like 20-50%, depending on N54 vs. N55.

Let's look at the S55...shall we?

Stock, dynos around what, 410-420 whp? And the stock turbos max out at about what, 525 whp?

10% huh?

Again, I've already said I don't think BMW would be maxing out the stock N55 snail, for the very reason that the B58 is so underrated. So we both think it will have a bigger turbo.

That doesn't mean you should continue to post made-up, factually incorrect information to allegedly support that position.