My local Esso garage has just started selling 99 Octane petrol. This has made me think about how much of a “high performance” engine the X Wedge really is. S&S say it’s a high performance engine and it should be fuelled with minimum 96 RON but in the grand scheme of things 80ish HP from a 2 litre isn’t huge although the torque is impressive. I wonder how much benefit better pre ignition control through higher octane fuel will be for this engine given it has a knock sensor and presumably the programming to exploit it? Anyway assuming that the ECU would be doing less retarding I filled up with it anyway but discounted what I perceived to be a crisper performance as probably placebo effect.
My engine hasn’t been upgraded apart from a better intake filter, has anyone run a M3W on higher octane fuel say 99 vs 96 RON on a dynamometer and shared results? I imagine those that have done engine upgrades will know more about this than me.
