Octane specifically resists combustion. The higher the octane the more work that takes to combust. It makes less power but the trade off is higher octane resists detonation. Lower octane makes more power but once detonation occurs that power becomes destructive. Fords are not "hard to tune" they use torque demand. Pump gas is spark limited and e85 is limited by the amount of fuel delivery you can supply.
Simply, octane is a measurement of a fuel's ability to resist auto ignition. With higher octane fuels, you can create more cylinder pressure without the fuel auto igniting. Not all Fords use the same logic. The Ecoboost cars specifically use Ford's HDFx strategy, which is a giant algebraic conundrum. They are not easy to tune because the logic is extremely complicated.
@KarzKreated Octane resists combustion. Auto ignition is combustion. Higher pressures cause less resistant fuel to combust more easily. The higher the octane the more work it takes to combust. Meaning it makes less power overall. HDfx is a torque demand strategy. Pretty much all modern ecus are, tuning and engine is very straight forward. Using OEM protections and correction factors / tables. The good thing is that most of those corrections can be adjusted as they are temperature or pressure based among others. All that to provide an amount of timing advance or retard + fuel + air to make the engine run.
Engine masters made a video disproving this theory On an engine dyno with the only change in variable being fuel 87,93 100 and Ms109 all Made the exact same horsepower
93 octane is considered good in America? 95 is the least you can buy in Europe nowadays but sometimes you can still get 91 at the same price. Premium being 98 or 100
I think the rating system of our fuel's octane is different. 93 octane is the highest available octane of gasoline that is sold at a pump here. Some stations sell race gas of over 100 octane at the pump, but they are few and far between. 93 is king next to E85 here in the States when it comes to a performance fuel.
Octane specifically resists combustion. The higher the octane the more work that takes to combust. It makes less power but the trade off is higher octane resists detonation.
Lower octane makes more power but once detonation occurs that power becomes destructive.
Fords are not "hard to tune" they use torque demand. Pump gas is spark limited and e85 is limited by the amount of fuel delivery you can supply.
Simply, octane is a measurement of a fuel's ability to resist auto ignition. With higher octane fuels, you can create more cylinder pressure without the fuel auto igniting.
Not all Fords use the same logic. The Ecoboost cars specifically use Ford's HDFx strategy, which is a giant algebraic conundrum. They are not easy to tune because the logic is extremely complicated.
@KarzKreated Octane resists combustion. Auto ignition is combustion. Higher pressures cause less resistant fuel to combust more easily. The higher the octane the more work it takes to combust. Meaning it makes less power overall.
HDfx is a torque demand strategy. Pretty much all modern ecus are, tuning and engine is very straight forward. Using OEM protections and correction factors / tables. The good thing is that most of those corrections can be adjusted as they are temperature or pressure based among others. All that to provide an amount of timing advance or retard + fuel + air to make the engine run.
Engine masters made a video disproving this theory
On an engine dyno with the only change in variable being fuel 87,93 100 and Ms109 all Made the exact same horsepower
93 octane is considered good in America? 95 is the least you can buy in Europe nowadays but sometimes you can still get 91 at the same price. Premium being 98 or 100
I think the rating system of our fuel's octane is different. 93 octane is the highest available octane of gasoline that is sold at a pump here. Some stations sell race gas of over 100 octane at the pump, but they are few and far between. 93 is king next to E85 here in the States when it comes to a performance fuel.
@@KarzKreated You are right. I just looked it up in detail. Thank you for explaining.
But in turbo car the 93oct is better for detonating in the combustion chamber????
Yes, absolutely.