Is the official 405 posted horsepower on 87 octane?

[Critical Habitat]

Ford also warns that RR owners using regular unleaded in higher altitudes risk potential engine damage. From the online interactive owner's manual.

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[Ivan Baez]

the raptor is prone to pinging if low quality fuel is used.

 

[jrRaptor]

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.

That chart is wrong. DI only. There's another thread floating around with this topic from last year and it was a doozy lol. You can literally go out and look at the engines now since a lot of 24MY Ranger's have been delivered and see that it is DI.

 

[millertime496]

Well the elevation thing kind of sucks, the gas up in em colorado is trash. Wish I had the change for a bigger tank right now. Still havent heard back if its self calibrates its distance to e. I wouldnt think so, so could I live with not knowing that, would the guage still function????

 

[nikhsub1]

When you run LESS than 91 octane the truck is constantly relying on the knock sensor to retard timing and pull boost. In lamens terms, that means that your engine is detonating and once that is detected the computer pulls back timing and boost. Detonation is one of the absolute WORST things you can do to a motor.

Y'all are familiar with 'flat' in EQ settings? Well, think of 91 octane as flat for the computer. See, 93 isn't available everywhere, so most MFGRs calibrate things to 91 octane. 93 certainly won't hurt, but it really won't get you any more than 91.

Bottom line is, if you use anything less than 91 you are constantly relying on the knock sensor to dial back timing and boost when it detects detonation.

 

[Roverhound]

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

According to the chart posted above, 10.5:1.

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