BenzWorld Senior Member
Date registered: Nov 2013
Vehicle: 1996 C220 2007 ML320 CDI
Mentioned: 0 Post(s)
Quoted: 71 Post(s)
Warning, science content.
The higher the octane rating of the fuel, the LESS it has available power per given quantity. This is due to the HIGHER activation energy of higher octane fuels. The higher activation energy means more resistance to knock, which means engine management software can advance the ignition timing more, making more efficient use of the available energy of the air/fuel charge (in layman's terms, you are using up more energy to start the reaction of combustion, instead of using that energy in pushing the piston downwards). In other words, if ignition timing were constant, lower octane fuels would give you more power (assuming they are not diluted with alcohol, and the additives package is identical). Now suppose your engine is already tuned to the point where the pressure front in the combustion chamber meets the piston at EXACTLY top dead center, advancing the timing further would give you no benefit, and would actually cause you to loose power AND knock, regardless of the knock resistance of the fuel (but now we are knocking for an entirely different reason, it's not knocking due to pre-igntion, but rather because your ignition trim is past fully advanced). No street engine could benefit from this.
Assuming no additives are used in this fuel, which I doubt VERY much, the only way to get 100 octane fuel is with pure 2,2,4-Trimethylpentane, which as far as I know is impossible with current fuel distillation methods (at least with those for mass production of fuel, which racing fuel falls under the category of). So I'd already be dubious of the effects those additives have on your car and on the environment. Keep in mind race cars basically run on premium, including but not limited to Formula 1. I doubt any race car uses fuel with an octane rating higher than 95. Formula one engines make their power by having MUCH tighter piston tolerances than street engines. Which is why Formula one cars are always plugged into machines that keep the oil and coolant hot and circulated through the engine, even during transport! Those kinds of engines wouldn't need higher octane ratings than what's available in the pump to make more power.
I would not put that in my car.