91 vs 93 octane, stock motor

[SVO MkII]

Does anyone know if 93 octane makes any more power in a stock motor than 91 octane?

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[Dirty-EB-Chicago]

Does anyone know if 93 octane makes any more power in a stock motor than 91 octane?

The short answer. Yeah, higher octane = more power

 

[SVO MkII]

The short answer. Yeah, higher octane = more power

Yes, that is certainly true when you are talking 87 vs 91. But I believe there is a limit for the stock tune. For example, If I put in 98, or even 104 octane, I doubt the stock tune will do anything differently to take advantage of that.

So, does anyone know for certain if the stock tune will continue to modify timing/boost beyond 91 octane, up to 93? I doubt it, but I'm up in WI now where all they have is 91. I can get 98 or 104 at Road America if need be, to blend it up to 93, but I doubt it matters for stock.

 

[Grafanton]

No No No.

Octane is a rating for resistance to knock. It will not create more power.

Yes, if there is less knock the engine will make more power than when it's knocking, but it will not exceed the stock rating of the engine. You could run a blend of Acetone, Toluene and Nitro Glycerin and it wouldn't make anymore power.

 

[H@mmer]

No No No.

Octane is a rating for resistance to knock. It will not create more power.

Yes, if there is less knock the engine will make more power than when it's knocking, but it will not exceed the stock rating of the engine. You could run a blend of Acetone, Toluene and Nitro Glycerin and it wouldn't make anymore power.

What? You're so wrong.
These cars run the timing up if there's no knock. That's why they make more power on 93 vs 87.
Now, as mentioned before, there's a hard limit in the stock tuning. So race gas, for instance, isn't going to do anything for you on a stock tune. But going above 87 will for sure result in more power for you.

 

[Dirty-EB-Chicago]

Yes, that is certainly true when you are talking 87 vs 91. But I believe there is a limit for the stock tune. For example, If I put in 98, or even 104 octane, I doubt the stock tune will do anything differently to take advantage of that.

So, does anyone know for certain if the stock tune will continue to modify timing/boost beyond 91 octane, up to 93? I doubt it, but I'm up in WI now where all they have is 91. I can get 98 or 104 at Road America if need be, to blend it up to 93, but I doubt it matters for stock.

Ok well it does generate more power because the engine was designed to run on the stock tune between 87 and 93, 93 being the higher end of the spectrum. running 93 it will have more knock resistance and have a wider margin before pulling timing. what makes you think that 91 would be the same as 93 that's where I'm confused. why would a high octane rating not yield more benefits on a turbo motor? also I'll be doing road america in june maybe ill see ya up there. I'm running with MVP midwest on the 14th and 15th I believe.

 

[TorqueMan]

What? You're so wrong.

I think you two are talking past each other. There is no more power (typically measured by BTUs per gallon) in premium fuel as compared to regular. The engine's computer, however, will allow the engine to produce more power when it senses the higher octane of premium.

So you're both right. There is no more power in premium fuel, but the engine produces more power when you use it.

 

[HISSMAN]

No No No.

Octane is a rating for resistance to knock. It will not create more power.

Yes, if there is less knock the engine will make more power than when it's knocking, but it will not exceed the stock rating of the engine. You could run a blend of Acetone, Toluene and Nitro Glycerin and it wouldn't make anymore power.

Maybe back in the early 2000's...

Please never tune a modern car.. LOL

 

[Elgyn]

anyone compare 87+meth to just 93?

 

[ctandc72]

I highly doubt the stock Ford tuning tables account for anything higher than 91 - since 93 isn't available in every state. I very well could be wrong, and I hope someone who has experience with the stock Ford tuning tables / formulas would chime in.

Modern engine controls are highly advanced, even compared to say 10 years ago. A higher octane fuel (93 vs 87 octane for example) will produce different readings on the sensors and controls monitoring the engine. In other words, the computer will give the engine more total timing advance on higher octane fuel - thus making more power.

I do know from looking at two other manufacturer's tuning tables, they do in fact dyno / test with the full range of fuels (octane ratings) available to the market that tune / model is being released in.

 

[HISSMAN]

Yes they do. It is actually in the owner's manual.

 

[ctandc72]

Yes they do. It is actually in the owner's manual.

Not quite clear, were you referring to my post? I've never checked the manual out for the EB - does it specifically mention fuel octane and performance?

 

[HISSMAN]

I believe so. In know that the V8 does.

 

[Cardude99]

https://www.ford.com/cars/mustang/models/ecoboost-fastback/

Look under specifications it clearly lists power and tq are on 93 octane fuel.

 

[Marvinmadman]

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