Is the official 405 posted horsepower on 87 octane?

[jprime84]

Its covenient that the truck can take 87 octane, but do we know if the quoted power figures are made with that fuel? Would the truck perform better on higher octane just by the ECU compensating, or would it actually need a tune to alter performance figures meaningfully?

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[GManGeno]

Its covenient that the truck can take 87 octane, but do we know if the quoted power figures are made with that fuel? Would the truck perform better on higher octane just by the ECU compensating, or would it actually need a tune to alter performance figures meaningfully?

Interesting question, since I saw a video that showed 'min 87 octane' posted on the fuel door. But, we all know that the truck will perform better with higher octane, and if it is anything like MPGs, I would say that Ford will put their best foot forward, meaning the numbers are based on higher octane (best case scenario)

That is of course just my conjecture. Interested to see if anyone has the actual data.

 

[mperezkr]

definentaly not.

 

[Slyder]

The Ranger Raptor is a premium unleaded fuel only vehicle, just like the Bronco Raptor.

 

[RacerX]

looks like figures are from 91 octane

hmm, I read the 3.0 was DI only like the 2.3, but this chart says different.

 

[G L Rockwell]

The Ranger Raptor is a premium unleaded fuel only vehicle, just like the Bronco Raptor.

It actually will run on 87 as designated on the fuel door, the higher the octane the better obviously.

 

[RacerX]

The Ranger Raptor is a premium unleaded fuel only vehicle, just like the Bronco Raptor.

People are probably referring to videos where 87 octane is written on the fuel door.
I didn't really look into this as I will run 93 for best performance, but I just checked the owners manual and it mentions 87 as min octane with no caveat or call-out for Raptor (or 3.0) requiring a higher min octane.
There are plenty of other sections in the manual where Raptor or 3.0 are listed with different specs.
Kinda cool.

 

[Slyder]

I was also taking for granted that it was listed the same as the Bronco Raptor, which is (or was if they revised the manual) listed as Premium fuel only.

 

[81stfacp]

What's the compression ratio on 3.0L RR engine?

 

[MAV]

9.5:1

 

[jprime84]

It actually will run on 87 as designated on the fuel door, the higher the octane the better obviously.

Exactly, but I guess that's the root of my question. Will the ECU just work out the adjustments on the fly based on the fuel you have in there?

 

[G L Rockwell]

Exactly, but I guess that's the root of my question. Will the ECU just work out the adjustments on the fly based on the fuel you have in there?

As I understand it learns and adjusts after a tankful.

 

[mperezkr]

Exactly, but I guess that's the root of my question. Will the ECU just work out the adjustments on the fly based on the fuel you have in there?

"From the factory, Ford typically designs the base calibration to allow use of 87+ octane fuel and recommends using 91+ octane fuel for optimal power. They can do this by means of a dynamic multiplier that allows for adjustment of each of these targeting and limiting strategies which we call the “OAR” (Octane Adjust Ratio). The OAR starts life at a value of 0.0 and is allowed to learn in two directions. When fuel quality and knock sensor feedback are optimal, the OAR will adjust towards -1.0. When these are sub-optimal, the OAR will adjust towards +1.0. I bet you’re wondering why -1.0 is better?
Well for one, since this value is a multiplier and not an offset the ECU code can be optimized to use a single table comprised of negative values to handle the spectrum of operating conditions. Take ignition timing corrections for example; with an OAR at -1.0, multiplying against a negative becomes positive which is then added as positive correction to ignition timing. However, when conditions are sub-par a +1.0 OAR will result in negative correction to ignition timing."


Ford Ecoboost and the Octane Adjust Ratio Monitor - COBB Tuning

 

[Bt_okst]

Its covenient that the truck can take 87 octane, but do we know if the quoted power figures are made with that fuel? Would the truck perform better on higher octane just by the ECU compensating, or would it actually need a tune to alter performance figures meaningfully?

No. The hp and torque quoted is always achieved with premium fuel. It will state this in the owners manual too.

 

[Sportshot2]

Holy Crap, I thought when I read the technical description that Moses posted that maybe my long passed older brother had been reincarnated. With a name like Moses and an engineers description of what happens maybe reincarnation is real. After all that information I would say you mean “Just run 91 or better octane?” There was never a short answer with Tom. Thank you for the pleasant memory!

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