Quote:
Originally Posted by ajvdh
FTOM (page 165) "If you use gasoline with this minimum AKI Rating, the engine may produce knocking sounds when starting at high outside temperatures."
When an engine detects knocking, it's going to do something to compensate. Generally pull boost or timing.
This might provide useful information:
https://en.wikipedia.org/wiki/Octane_rating#Effects
and
https://en.wikipedia.org/wiki/Octane...nal_variations
Scroll down to the bullet item about the US, and pay particular attention to the sentence about turbo cars being forced to run 91 instead of 93. |
That's a pretty roundabout way of saying "I'm not sure."
We're already very familiar with octane and how it impacts knocking, timing, and horsepower. This is the M2 forum, after all. I asked if you had any specifics about this particular BMW engine. Seems like aside from a generic "most turbocharged vehicles are unable to produce full power, even when using the "premium" 91 AKI fuel" Wikipedia answer, we don't yet.
As a practical example, I'd like to know if a bone stock M2 in California running 91 is going to be measurably slower than the same car in Washington State running 93.
I somehow doubt it.