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  1. #1
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    OE Tune on 100 Octane

    Hey All – I have an EZ Flash from OE tuning. One of my maps is optimized for 100 octane fuel. A couple of questions for the forum: is it OK to mix 93 octane with 100 octane or should I empty my tank first and then add 100 Octane? What type of performance gains can I expect from using 100 octane fuel? Lastly, is there any long-term engine damage from using 100 octane fuel?

    Also, I wanted to thank Jeremy for getting my tune back after a BMW dealership here in Houston put me back to stock and added a “tuner lock” to my ECU. After removing the tuner lock and putting my tune back, my car feels very different; especially at low RPMs. After getting my tune back, I had a nice race with a CLK 55 AMG that had a hard time keeping up with my bolt-on M3, which I attribute to the tune Click here to enlarge

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    Click here to enlarge Originally Posted by tinpot Click here to enlarge
    Hey All – I have an EZ Flash from OE tuning. One of my maps is optimized for 100 octane fuel. A couple of questions for the forum: is it OK to mix 93 octane with 100 octane or should I empty my tank first and then add 100 Octane? What type of performance gains can I expect from using 100 octane fuel? Lastly, is there any long-term engine damage from using 100 octane fuel?
    This depends on how much fuel you have in the tank. If you have 10 gallons of 93 octane and then put in some 100 do not run the 100 map. The map is for 100 octane so you want as much 100 octane as possible. Basically, run the tank as low as possible then fill up with 100.

    No long term damage from using 100 octane, it is just higher octane unleaded fuel, that is all. It is better for your high compression motor, not worse.
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    Thanks Sticky. What type of performance gains can I expect from the 100 map?

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    Click here to enlarge Originally Posted by tinpot Click here to enlarge
    Thanks Sticky. What type of performance gains can I expect from the 100 map?
    You are already on 93? I wouldn't expect anything huge but definitely a difference for a tune optimized for it, 10 whp should be within reason, maybe more.
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    Even on a 93 map the 100 oct will allow a bit more dynamic timing targetting after some adaptation and continuous runs with zero KR events.

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    Well, I'm almost out of gas so I'm gonna give the 100 octane a try.

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    Click here to enlarge Originally Posted by tinpot Click here to enlarge
    Well, I'm almost out of gas so I'm gonna give the 100 octane a try.
    Awesome, let us know your impressions.
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    As sticky said the car should run even better with straight 100 in the car. Even my friends GT2 benefits from running 100 with everything else left unchanged (boost timing etc), he says it runs very smooth and feels more powerful.

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    I'm having a hard time finding 100 octane fuel. I was hoping to find a pump in the Houston area but my options seem to be limited to buying 100 octane fuel in a 5 gallon drum or driving to Baytown where the 1/4 mile track is located Click here to enlarge
    Last edited by tinpot; 02-04-2011 at 11:25 PM. Reason: typo

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    isn't buyracegas.com from houston?

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    I used to run low lead 100 octane...killed a few o2 sensors here an there =D but car felt so much better.
    BMW Master Certified Tech - ///M Specialist & Diesel Specialist
    - '02 BMW 530i/5 speed - 596WHP/558FT-LBS @ 22 PSI, E85 PTE6262
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    Click here to enlarge Originally Posted by DLV-Engineering Click here to enlarge
    I used to run low lead 100 octane...killed a few o2 sensors here an there =D but car felt so much better.
    Leaded fuel is nice if you don't have to worry about cats and such but on the S65 I don't recommend. MS109 should cover everyone...
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Leaded fuel is nice if you don't have to worry about cats and such but on the S65 I don't recommend. MS109 should cover everyone...
    Heck no, nothing leaded near cat'ed products. Asking for issues there. I just mentioned it as a just. I know down here at the race track we have 98 octance unleaded at the pumps, but it's $7.XX A gallon.
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    Does a car need to be tuned for race fuel or does the ECU adapt to the higher octane.

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    you can go to sunoco's site and find dealers for the race fuel, some gas stations. speed shops should carry it as well,

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    Thai. Read my post

    BG

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    Click here to enlarge Originally Posted by BrenM3 Click here to enlarge
    Even on a 93 map the 100 oct will allow a bit more dynamic timing targetting after some adaptation and continuous runs with zero KR events.
    Bren, can you translate this for me. When you say "after some adaptation and continuous runs" how long does it take? Let's say I fill up my tank with race fuel, will I notice the difference immediately?

    What does "zero KR" mean?

    Sorry for all the newbie questions.

  18. #18
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    Read it again lol. Continuous runs with no knock result due to higher octane adaptation will allow the dme to reach higher timing targets and achieve higher power if the tune is mapped for it.

    BG

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    1 out of 1 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by gixxer_kidd Click here to enlarge
    Does a car need to be tuned for race fuel or does the ECU adapt to the higher octane.
    The stock DME will adapt up to a limit, so running 100% 105 octane probably won't make more power than 100 octane (but both will make more than 93). I read somewhere on m3post that the S65 didn't make any more power once you were running at least ~95/96octane... A high-octane tune will move the timing windows to take advantage of the available octane

    Click here to enlarge Originally Posted by gixxer_kidd Click here to enlarge
    Bren, can you translate this for me. When you say "after some adaptation and continuous runs" how long does it take? Let's say I fill up my tank with race fuel, will I notice the difference immediately?
    Not immediately, but you should start noticing after a few pulls. If the DME doesn't see any knock events in a while, it'll advance timing (again up to a point). This takes time -- the DME won't know the moment you start the engine that you just finished pumping race gas

    What does "zero KR" mean?
    knock retard/results
    Last edited by spdu4ea; 02-17-2011 at 05:47 PM.

  20. #20
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    Click here to enlarge Originally Posted by spdu4ea Click here to enlarge
    The stock DME will adapt up to a limit, so running 100% 105 octane probably won't make more power than 100 octane (but both will make more than 93). I read somewhere on m3post that the S65 didn't make any more power once you were running at least ~95/96octane... A high-octane tune will move the timing windows to take advantage of the available octane
    Exactly correct.
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