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      12-11-2013, 10:34 PM   #92
JoeFromPA
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Drives: '15 AW M3 6MT Stripper
Join Date: Aug 2013
Location: SE PA

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On the tuning discussion:

James, BMW's FI motors have been modestly under-rated. By your own points, they are making usually ~5% less that their rated crank hp according to most dyno's. Let's not sit here and expect the f80 to be making 400whp just yet. That'd be 50whp better than the typical s65.

I also think the tuning paradigm has changed. The n54 was a special motor with a lot of potential that was easily accessible. The n55 is less so. The n20 taps out at ~270whp without hefty mods or e85, etc.

I think BMW is now getting more comfortable pushing their turbo motors from the factory a bit further. And this new f80 application is going to be using two small turbos to eliminate lag - that is not a recipe for adding 100whp with headers and a tune.

...

On the flip side, let's remember that the market for m5/m6 tuning is not that big and thus there may simply not be the urgency to break their ECUs open just yet.
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