Quote:
Originally Posted by EZWood
So i went down to my local napa, bought five gallons of 110 octane put it in on E. more power, better response. filled it up the rest of the way with 91, lost some of the power and response. what im wondering is what is the limit where its a waste for octane level? Anyone have an opinion on this?
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You dont seem to understand what octane does in a fuel. Higher octane prevents detonation. It burns slower and more controlled. That allows you to run more ignition advance and/or boost in an FI car. That's what makes more power, running more agressive profiles - profiles that would damage the engine otherwise with detonation.
You dont benefit any from running 110 octane over premium as that is what the factory tune is done on. The ECU isn't going to run a more aggressive map than the one meant for premium because there ISNT one programmed.
Even if you went to the dyno and extracted as much power as possible from that fuel you're not going to net much of anything over premium without rebuilding the engine with much higher compression pistons for a higher static CR or boosting the hell out of it.
