Renntech Intermediate Tune Only 11.51 at 129.63mph
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Joined: Nov 2001
Posts: 12,263
Likes: 901
From: THE Orange County, California
2024 C8 Z06- 2025 BMW CS- 2022 Porsche 992 GTS
There's no way for a car to sense the octane of gas outside of watching for knock. Many manufacturers (including Ford with their new EcoBoost truck that advertises more torque if you use higher octane) have a soft series of timing advance maps that some algorithm moves up and down as it senses knock.
That said, you can vary the aggressiveness of the timing "yank" that occurs with the sensation of knock in one or more situations. I'd be slightly cautious about how aggressive tuners push the timing and boost if they dont have an equally aggressive removal.
That said, the ECMs are not going to just add boost and advance until they sense its too much and then back off a little. Each of the maps are specifically retuned, retested, and (I hope) carefully watched under a variety of environments before they advertise them.
Octane produced no gains by itself... in fact higher octane fuel has *less* energy density than lower octane. The car has to take advantage of the octane to make more power from the remaining fuel.
That said, you can vary the aggressiveness of the timing "yank" that occurs with the sensation of knock in one or more situations. I'd be slightly cautious about how aggressive tuners push the timing and boost if they dont have an equally aggressive removal.
That said, the ECMs are not going to just add boost and advance until they sense its too much and then back off a little. Each of the maps are specifically retuned, retested, and (I hope) carefully watched under a variety of environments before they advertise them.
Octane produced no gains by itself... in fact higher octane fuel has *less* energy density than lower octane. The car has to take advantage of the octane to make more power from the remaining fuel.
It can't.
That said, now-a-days direct injection has made fuel timing important. If the car can carefully adjust the timing of the fuel injection to optimize much higher-than-stock boost flame travel and whatnot, then maybe (maybe) the car can learn in a little extra power (but no way 83).
That said, now-a-days direct injection has made fuel timing important. If the car can carefully adjust the timing of the fuel injection to optimize much higher-than-stock boost flame travel and whatnot, then maybe (maybe) the car can learn in a little extra power (but no way 83).
Thanks for this--- makes all the sense with the technical input along with the mapping part that Eric originally brought up that alot of us forget about (including me). Its sad that we dont any thing better regulary available in CA.
