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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
93-octane necessary?
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<blockquote data-quote="FordTechOne" data-source="post: 1402160" data-attributes="member: 35543"><p>This is not a matter of a preference...it's a difference between design intent and engineered tolerance for those that choose not to follow the OEM recommendation.</p><p></p><p>The 3.5 H.O. is designed to run on 93 octane. Period.</p><p></p><p>If you choose to run lower octane, the PCM will compensate by pulling ignition timing and boost. Which means that the engine is not operating within the performance or efficiency parameters it was designed for. The engine control software is incredibly sensitive and can detect spark knock within miliseconds, but the software still requires spark knock to occur before timing and boost are retarded. Not something that I want occurring in my engine if I can prevent it.</p><p></p><p>The other thing that needs to be considered is fuel quality. If you buy 87 octane from a fuel station (especially non-top tier fuel station), there is no guarantee that it meets the 87 Octane MON/RON requirements. If the PCM is designed to compensate for the spark knock caused by 87 octane and the octane in your tank is actually 85, what do you suppose will happen? Will the PCM be able to react and compensate quickly enough, of will you crack a ringland? I'm not playing that game.</p><p></p><p>I would understandably expect this thread on a regular F-150 non Raptor/Limited forum, but I'm honestly surprised to see this discussion here.</p></blockquote><p></p>
[QUOTE="FordTechOne, post: 1402160, member: 35543"] This is not a matter of a preference...it's a difference between design intent and engineered tolerance for those that choose not to follow the OEM recommendation. The 3.5 H.O. is designed to run on 93 octane. Period. If you choose to run lower octane, the PCM will compensate by pulling ignition timing and boost. Which means that the engine is not operating within the performance or efficiency parameters it was designed for. The engine control software is incredibly sensitive and can detect spark knock within miliseconds, but the software still requires spark knock to occur before timing and boost are retarded. Not something that I want occurring in my engine if I can prevent it. The other thing that needs to be considered is fuel quality. If you buy 87 octane from a fuel station (especially non-top tier fuel station), there is no guarantee that it meets the 87 Octane MON/RON requirements. If the PCM is designed to compensate for the spark knock caused by 87 octane and the octane in your tank is actually 85, what do you suppose will happen? Will the PCM be able to react and compensate quickly enough, of will you crack a ringland? I'm not playing that game. I would understandably expect this thread on a regular F-150 non Raptor/Limited forum, but I'm honestly surprised to see this discussion here. [/QUOTE]
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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
93-octane necessary?
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