Xfitter
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Thought this would make for a good separate thread. The owners manual says you can run regular gas (87 octane) in the 2.3L ecoboost Ranger, so that leads to the natural question if higher octane gas would yield more power. The easy answer is yes, but how much power difference?
Tuners have performed comparison dynos on Ecoboost Mustangs to test this. Here's one that led to a 22 whp / 4 wtq difference between 87 octane and 92 octane, with peak difference above 4500 rpm.
Tuners have performed comparison dynos on Ecoboost Mustangs to test this. Here's one that led to a 22 whp / 4 wtq difference between 87 octane and 92 octane, with peak difference above 4500 rpm.
Initial Testing - 87 vs. 92 Octane
Our 2016 EcoBoost Mustang is a base 6AT model with a 3.15 rear gear. To start off our testing, we wanted to see the power difference on the as-delivered from the dealer 87 vs. 92 octane pump gas. Due to the factory 120mph speed limiter interrupting 4th gear pulls, these runs were done in 3rd gear.
When switching fuel octane, it takes some time for the PCM to adjust ignition timing to take advantage of the higher octane. This value is known as OAR - Octane Adjust Ratio and is a multiplier. It starts at 0 and learns from there based on knock feedback towards +1 for less than optimal fuel and towards -1 for high quality fuel. Our car was driven for 2 weeks after the change from 87 to 92 octane to ensure it was at -1 OAR and then the comparison pulls were made.
NOTE: The majority of EcoBoost Dynojet charts we’ve found online are in STD correction factor, so we will be posting our charts in STD for ease of comparison.
We saw large gains above 4,500rpm as a result of added timing with the better quality fuel, with peak to peak increases of +22whp/+4wtq. The sharp drop in power that occurs at high rpm (5500-6000rpm) is largely the result of extremely rich AFR's (air-fuel ratio) as the catalyst protection strategy comes into play and the factory PCM mapping starts commanding additional fuel to keep things cool.
https://www.speedfactoryracing.net/mustang-ecoboost-dyno-data
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