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  1. #1
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    temp drop = elevated fuel trims?

    Or is there something else going on?

    First log is from a couple days ago in 55F, second log is from the summer in 95F. Both using a similar mixture of fuel
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    Loe P.
    B8.5 Audi S5 3.0"T" - GIAC stage II ECU / GIAC DSG TCU / AWE-tuning Pulley / AFe filter / 034 TBB / mod airbox / X-pipe
    - 09' E90 M3 7-DCT Interlagos Blue / Novillo Silver - gone Click here to enlarge
    [K&N filter|MS pullies|test pipes|Evolve Stg II tune/Servotronic/GTS-DCT Tune|Euro MDM]


  2. #2
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    As temperature decreases, air density increases. Higher density equals more O2 molecules per unit volume. That is my guess.

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    It's normal. Cooler air needs more fuel.
    E90 335i 6MT
    JB4 G5
    FBO + Meth

  4. #4
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    this
    Click here to enlarge Originally Posted by piele_bps Click here to enlarge
    It's normal. Cooler air needs more fuel.
    and this
    Click here to enlarge Originally Posted by ajm8127 Click here to enlarge
    As temperature decreases, air density increases. Higher density equals more O2 molecules per unit volume. That is my guess.

  5. #5
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    Absolutely. As others have said we use an absolute boost target system and colder air is denser so you get more oxygen squeezed in for a given PSI. Which needs more fuel, all else being equal.
    Burger Motorsports
    Home of the Worlds fastest N20s, N54s, N55s, N63s, S55s, and S63s!

    It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please see http://www.burgertuning.com/emissions_info.html for more information on legal requirements related to use of BMS parts.

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    This is exactly what I've said a couple times on other forums, but everyone likes to jump on the "COOL TEMPS, MORE BOOST" train pretty fast lol. Generally speaking I down the boost a bit when winter kicks around, but most people seem to want to run more boost because of cooler temps. I guess it depends on how far you were pushing the threshold before winter kicks around.
    jb4+fbo+meth

  7. #7
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    That is where auto tuning works out nicely. It will adjust boost, wastegate duty cycles, and open loop, as you go.
    Burger Motorsports
    Home of the Worlds fastest N20s, N54s, N55s, N63s, S55s, and S63s!

    It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please see http://www.burgertuning.com/emissions_info.html for more information on legal requirements related to use of BMS parts.

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    thanks for the responses. My fuel trims remain the similar w/o methanol too when I logged last night. I would normally run w/ meth, but my Coolmist solenoid is "stuck" and won't flow w/ the in/out direction, only reverse. First methanol kit ever, and it's not been reliable.

    sorry in advance for the short log. Summer fuel trims w/ E50 normally peaks at 30 in fuel trims w/o methanol.
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    Loe P.
    B8.5 Audi S5 3.0"T" - GIAC stage II ECU / GIAC DSG TCU / AWE-tuning Pulley / AFe filter / 034 TBB / mod airbox / X-pipe
    - 09' E90 M3 7-DCT Interlagos Blue / Novillo Silver - gone Click here to enlarge
    [K&N filter|MS pullies|test pipes|Evolve Stg II tune/Servotronic/GTS-DCT Tune|Euro MDM]


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