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      12-16-2013, 01:28 PM   #130
basscadet
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Drives: 991.2 GT3
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Quote:
Originally Posted by Boss330 View Post

Please explain what make the above engines less "humble" than the S55 and why we should be concerned with the capabilities of the S55 and not the 991, GT-R, RS6 or A45 AMG?

Please at least try to do some fact checking before claiming things... It improves credibility


Your response does not apply to my question. Yes, we know the 2 liter in the new AMG makes a lot of power, it is the character of the power and the ability to extract more power from the engine that we're discussing here. We all know that a RB26DETT is capable of immense power (>1000whp), but this isn't a discussion about hp per liter.


Quote:
Originally Posted by Savory View Post
Again, you have yet to provide any proof that the S55 is under engineered and over stressed.
I have no doubt the S55 engine itself is capable of developing LOTS of power provided there is a turbo mated to it that can make that kind of power. I do not question the engine, I question the turbos. The turbos on the N54 are capable of putting down over 400whp before they run out of their efficiency range. That is a SIGNIFICANT, high ceiling over the factory "300"hp which found the turbos loafing by at under 9psi.

The M3/M4 turbo stock boost will probably be anywhere between 14-18.9psi depending on humidity and altitude. If we just start at the low end in ideal conditions, a factory 14psi map can go as high as...what....20psi? 21? We don't know the flow characteristics of these turbos but my guess is that they're small and are going to have to work as hard if not harder than the N54 turbos (this is based on BMW's claims of lag-free operation and low RPM spool-up)

So no I have no hard evidence. But I have owned turbo cars for 15+ years and have modified most of them and maybe I am not providing the correct science to satisfy your inquiry but I just think it seems highly unlikely that people are going to see 50+whp from this car with a tune-only like they're seeing in the N54 world.

It is just not hard to conceive that this engine is coming from BMW "pre-optimized" and therefore it is really hard to expect significant, inexpensive power gains. For many of you, the stock power levels are PLENTY. But for guys like me who want 4-door sports cars that can run with AMG C63s and CTS-V's, this just isn't enough.
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