93-octane necessary?

[EricM]

I wouldnt be suprised if the increased fuel economy of higher octane negates the savings of lower octane/lower economy.

If the engine is producing less power, it will have to work harder and use more fuel.

obviously I have no hard numbers to back it up!

The engine uses the same amount of fuel to hit the lambda value the EEC is calling for. Timing is the only real difference between 87 and 92, and that's only going to be at WOT. The engine produces the same power on both octanes during non-WOT usage.

People have tried to show that 92 gets better MPGs than 87 in EcoBoost engines, and its always the same mileage.


I know you know all of that though.

 

[goblues38]

Premium fuel is a total waste of money if the engine can run on 87. IMO, there's NO WAY you'd ever be able to tell your Raptor is running on 87 vs 92, and if that's the case, it's a total waste of money. Maybe, on the hottest days, if you are flogging the hell out of it- maybe you might be able to tell.

We can officially agree to disagree. America is awesome that way.

With the exception of my 2015 NA Mustang GT, I have driven nothing but forced induction cars since 2000. Including a "stage 2" 2013 SHO.

I most certainly can tell when cheap gas is being used.

 

[EricM]

I most certainly can tell when cheap gas is being used.

At WOT, and above 5000 RPMs- OK, sure maybe you can feel an extra 7 to 8% in power (assuming you WOT the thing on a regular basis and drive it all the time). For every other operating condition (ie 99.9% of the time), premium is a complete waste of money.

 

[Daweism]

Engineering Explained just did a test on this.

3.5 ecoboost f150 is one of the test vehicles. It sees 12% if i remember, difference in power between 87 and 93 octane.

Only you can decide. Are you good with a 400 hp ratptor instead of 45 hp to save .50¢ a gallon?

It is a $70k truck. Dont cheap out to save on $15 a tank of gas.

Hell no, gimme that POWER!

 

[SoxFan]

Use it every time I fill her up! This reminds me.....

 

[Daweism]

Use it every time I fill her up! This reminds me.....

"OR HIGHER ONLY"

 

[conflict]

I don't believe there is any type of fuel sensor. As a matter of fact, I've never heard of any Ford engine with anything like that. Some had the ethanol sensors- but that's it. 99.99% sure it just listens for knock and pulls timing accordingly.

As for the charts- both are correct. 87 is minimum octane. The published numbers were on 93. You won't get the published numbers on 87 octane, but the truck will run just fine.

don't waste your time trying to teach these mush heads about knock sensors, detonation, and timing. This is the dumbest forum on the internet. Let them put their 87 in.

 

[tmanker]

Conflict, is your age and # of likes mixed up?

The fact is that 93 isn't available in many locations. Some don't have access to 91. I have access to 93 locally so I use it. When traveling, I will use the highest available. I'm not particularly worried about this. 2019 Raptor supplement shows 87 minimum. The horse is dead folks.

http://www.fordservicecontent.com/F...tor-Supplement-version-1_su_EN-US_10_2018.pdf

 

[TwizzleStix]

...This is the dumbest forum on the internet...

There will always exist the debate amongst the ignorant about the different results in 87 vs 93 octane number. However, the above quoted statement is irrefutable fact. Enjoy the ignorance as I've heard it is pure bliss. I believe it too, as people really "don't know what they don't know".

 

[Higgs Boson]

The engine uses the same amount of fuel to hit the lambda value the EEC is calling for. Timing is the only real difference between 87 and 92, and that's only going to be at WOT. The engine produces the same power on both octanes during non-WOT usage.

People have tried to show that 92 gets better MPGs than 87 in EcoBoost engines, and its always the same mileage.


I know you know all of that though.

this is incorrect. the modern ford ecm will also reduce boost levels according to knock amounts.

the ecm develops a "learned octane" value based on how much spark lead it can add or has to remove and uses that value to limit boost. this is not your grandpa's ford anymore. they are way more sophisticated than you realize.

and as far as "producing the same power during non wot usage" that is also incorrect. LOTS of spark can get pulled at part throttle and the raptor engine also goes into boost with very little pedal input/load as the turbos are pretty small. this boost is limited on lower octane.

the bottom line is while it may not be noticeable to you if your butt is numb, there's a huge difference in power under the curve and part throttle boost production and spark lead with 93 vs 87.