Originally Posted by epiphone3
dude... read the other posts. There is more to the equation than compression... there is also IGNITION TIMING!
Dude, I read all the posts. Of course there is ignition timing (among many other variables). What do you think I mean by the ECU stepping in? But the timing can be advanced only so much. If it was that simple, we'd keep on pouring higher octane fuel and mess with the timing (manually or automatically) and hp would go up and up!? I'm saying BMW has probably already pushed things to the limit. Yes, I guess you could pick an hp or two by supplying 95 octaine fuel, but there are theoretical limits to that, and my main point has been, from the very start, that you need to increase the compression ratio to take full advantage of the higher octane fuel.