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Thread: Help with engine options

  1. #31
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    So maybe I've been told wrong, but on an EFI that goes into a Closed Loop + Adapt, I've always been told that running a higher octane will net you a percentage gain eventually as wideband 02s will see how close you are to stoic then in conjunction with LTFT and STFT start burning that higher octane more efficiently by changing injector pulse time. Just has to be over time(like a couple tanks worth of fuel).
    Is there something wrong about this explanation??

  2. #32
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    Back in the good ol' days a 2006 22ve
    I've always been told that running a higher octane will net you a percentage gain
    Once ignited, they have about the same BTU. The difference is the higher octane needs more heat to ignite, which is why its best for higher compression and/or forced induction.
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  3. #33
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    Jun 2015
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    Southern OR
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    2015 Z3 with TAPS 3 / 2007 Calabria ProV
    Here is a link to the Indmar Raptor octane requirements plus some other service tips. https://www.shoptalkbyindmar.com/service-tips

  4. #34
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    Jul 2015
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    2018 Rzx3
    there ya go ^. Like I said, running 91 in the 575, never have had even remotely an issue.

  5. #35
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    Jun 2015
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    Southern OR
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    2015 Z3 with TAPS 3 / 2007 Calabria ProV
    Quote Originally Posted by freeheel4life View Post
    So maybe I've been told wrong, but on an EFI that goes into a Closed Loop + Adapt, I've always been told that running a higher octane will net you a percentage gain eventually as wideband 02s will see how close you are to stoic then in conjunction with LTFT and STFT start burning that higher octane more efficiently by changing injector pulse time. Just has to be over time(like a couple tanks worth of fuel).
    Is there something wrong about this explanation??
    That is an accurate description of how these modern engine control systems work, but the amount of gain would be limited by the software design. If the ecm is programmed by the manufacturer for regular gas, there would be very little difference by changing to premium gas. The ecm is only going to change fuel delivery and spark advance to what the programming allows. Where you could see a difference is if you have been running regular gas in an engine designed for premium gas, the ecm will relearn and retard timing to a point that you will notice some reduction in power. Switch back to premium and after a certain amount of operation the ecm will again relearn and normal power should resume.

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