Quote:
Originally Posted by Choopa Phil
Heat + high compression motor = ping...all of my infiniti's have pinged with anything less than 91 in them. Once the ECU realizes this it pulls the timing reducing or eliminating ping. Youre basically losing performance without knowing it...cars are smart these days. Hell even my 97' maxima had a knock sensor back in the day.
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I would bet there are only a handful of production vehicles with =>12.5:1 compression(high compression). that's ~where 93 octane starts to make sense.