Octane booster vs Ethanol MIX

WernerM340IX · 05-03-2024, 01:14 PM

Does anyone have experience with adding an octane booster to the JB4 / JB+? Can this be compared with the
ethanol mix.

tylers1027 · 05-03-2024, 02:41 PM

I don't have any experience personally but from what I've read online, octane booster does provide nice HP gains but can clog up your 02 sensors, catalytic converter etc. I don't think the same applies to ethanol mix but can't say for certain.

rostrata · 05-08-2024, 10:10 PM

Octane boosters only true function is to mitigate knock to advance timing. And it’s questionable if that even works. I’ve tried some very expensive octane boosters when I was pushing into higher power territories to make sure I would get any knock just to test the tune out. The logs were often equal on timing between straight 91 to 91 with booster and a final octane rating of 100-101. Sometime a little better. But never by and more than 2-3 degrees, max.

That said, for basic stuff, there’s nothing like a good old fashioned e85 mix.

05-03-2024, 01:14 PM	#1
WernerM340IX New Member 8 Rep 27 Posts Drives: G21 M340IX 2023 LCI Join Date: Aug 2023 Location: Belgium iTrader: (0)	Octane booster vs Ethanol MIX Does anyone have experience with adding an octane booster to the JB4 / JB+? Can this be compared with the ethanol mix.
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05-03-2024, 02:41 PM	#2
tylers1027 Second Lieutenant 131 Rep 210 Posts Drives: 2022 330I Join Date: Jan 2022 Location: Willoughby, Ohio iTrader: (1)	I don't have any experience personally but from what I've read online, octane booster does provide nice HP gains but can clog up your 02 sensors, catalytic converter etc. I don't think the same applies to ethanol mix but can't say for certain.
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05-08-2024, 10:10 PM	#3
rostrata Second Lieutenant 126 Rep 222 Posts Drives: '20 M340iX Join Date: Mar 2021 Location: Las Cruces, NM iTrader: (0) Garage List 2020 BMW M340i X Drive [0.00]	Octane boosters only true function is to mitigate knock to advance timing. And it’s questionable if that even works. I’ve tried some very expensive octane boosters when I was pushing into higher power territories to make sure I would get any knock just to test the tune out. The logs were often equal on timing between straight 91 to 91 with booster and a final octane rating of 100-101. Sometime a little better. But never by and more than 2-3 degrees, max. That said, for basic stuff, there’s nothing like a good old fashioned e85 mix.
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