Will 93 octane offer any additional benefits?

 

Maybe, you know on the 2010 4.6 you can get 10 extra ft.lbs.

 

10 ft-lbs difference between 91 and 93?

I would guess it'd be more like 3 ft-lbs..

 

Well, 2010 is a 87 octane car, and putting super unleaded in it is good for and extra 10 ft.lbs. between 1000 and 3500 because the knock sensors don't intervene and retard the timing.

I was only sighting that example, I don't know that there will be any difference in the 2011 5.0 by going to higher octane.

 

Cool.. just pointing out that there's only a 2 octane point difference between 91 and 93. Original poster was asking about the difference between 91 (to get stock 412hp) - and 93 octane.

 

This is from Ford's 11.6.07 Press Release for the 08 Bullitt where Adaptave Spark Ignition was first used:

Engine performance is further enhanced through the use of an innovative adaptive spark ignition system, new for the 2008 [Bullitt] Mustang.
The system can sense, within a few seconds, what type of fuel is being injected into the motor and adjusts the spark to provide maximum torque at any given speed – and as much as
10 pounds-feet more between 1,000 and 4,000 rpm.
Bullitt can run on either premium or regular fuel. Ford recommends premium fuel for optimum performance, but the adaptive spark ignition will adjust the spark to burn regular fuel without damaging the engine.

This is from the 08 Bullitt Mustang Owners Manual:


So Ford says 'regular' is 87 and 'premium' is 91 because that is what is widely available across the entire US. It is only recently that 92 is available in my area and I believe that's only because of the 10% ethanol content. 93 is only available in select locations in the US.

The only way to eek out a little more performance if 93 is available is to adjust your timing. Otherwise your just wasting your money. And it would only be the slightest more low end torque beyond the 10 pound-feet.

 

I don't know if its linear but going from 87 to 91 octane was 400/377 to 412/390. If you get half of the benefit, 418/396? The old software could adjust for 94 octane so I have to imagine the Copperhead software can do the same thing.

 

yeah.. 6hp/6torque.. seems a little high, but i think it's within the range of reason..

 

there has already been testing done and running 93 octane on the new 5.0. The result/rumors were 30hp increase..this was mentioned over on the BMW forums...I dont have the post handy either..sorry.

 

Wait.... just for clarification... the 2011 GT requires 91 octane?

 

No, but you get 412 hp, 390 lb/ft with 91 and only 400 hp, 377 lb/ft with 87.

 

Hard to believe that. +2 in octane will give you an extra 18 hp when a +4 octane only gives you 12?

 

Sounds like wishfull thinking to me.

If that were actually the case you know Ford would be talking about it.

 

413 horsepower

 

i thought it was 413.6.....

 

30hp JUST from moving from 91 to 93 = BS.

 

 

Believe what you all will, this guy actually has some inside info on the motor. He has posted this on a couple of different forums as he has a high performance shop up north. Guess we will wait and see what happens, huh?

Let me be clear..this is 93octane with tune.

 

Then that changes the dynamic now, doesn't it?

To compare, you'd need a 91 tuned beyond factory.

 

Well a "Tune" and 93 octane, it's probably possible to get 30 HP out of that.

But who already has their hands on a new 5.0L ??