Lion77
Well-Known Member
- Joined
- Feb 27, 2025
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- 2024 Ranger Raptor
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- Electrical Engineer
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- #16
I actually talked to one of the FP development engineers back when I had my Mustang GT and he did say that you could run lower octane in an emergency, but you would need to avoid heavy throttle otherwise you would get into heavy knock and even possibly LSPI that would cause catastrophic failure.
So basically low speeds cruising at light load and downshifting. I think the safer thing to do would be to keep the programmer in the glove box or somewhere in the truck, if you absolutely can't find 91, flash back to stock, fill up 87 and get to somewhere that has 91 then flash back.
I've never personally run into that situation, and I've seen literally only one person this forum mention they have and only one time in their lifetime. If I do end up going the Pro Cal route, that's what I'll do.
I didn't have that option at all with the GT because it has an entirely different throttle body, intake, MAF etc. that the factory cal wouldn't work with. The truck at least is PCM cal only. No hardware changes, giving you an emergency backup option.
So basically low speeds cruising at light load and downshifting. I think the safer thing to do would be to keep the programmer in the glove box or somewhere in the truck, if you absolutely can't find 91, flash back to stock, fill up 87 and get to somewhere that has 91 then flash back.
I've never personally run into that situation, and I've seen literally only one person this forum mention they have and only one time in their lifetime. If I do end up going the Pro Cal route, that's what I'll do.
I didn't have that option at all with the GT because it has an entirely different throttle body, intake, MAF etc. that the factory cal wouldn't work with. The truck at least is PCM cal only. No hardware changes, giving you an emergency backup option.
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