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  1. #1
    RC Enthusiast
    Join Date
    Oct 2013
    Location
    Grenada, MS.
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    20

    Question 33 cool weather tune

    The temps here have dipped below 50, and now I am having one heck of a time with my tune. At factory settings it will fall flat and die under heavy throttle. I have had to richen the high almost 5 turns out and the low needle 2 1/4 to get it to run half way decent. Is this normal for cooler weather? Any explanation would be helpful.

  2. #2
    RC Turnbuckle Jr. Snook Man's Avatar
    Join Date
    Jan 2008
    Location
    Sugar Hill Ga.
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    8,374
    Totally normal…

    Cold air is more dense (more O2 per volume) than warmer air.
    Since you will be getting more O2 into the engine you also have to increase the amount of fuel to balance out the air/fuel ratio.
    No slipper/tall gearing/power = broken parts.

  3. #3
    RC Competitor
    Join Date
    Dec 2010
    Location
    Longview, TX
    Posts
    74
    Cold air tuning and starting is a challenge.
    For initial starting, one recommendation is to keep the motor inside until just before starting. Another is to buy a warmer for the unit. Or you can run a hairdryer on warm for a while to heat up the head and block.
    For tuning, remember that cooler air is more dense and requires more fuel. Unfortunately richening the fuel leads to lower engine temps and can make warmup a challenge. When temps dip down into the 30s and low 40s it can make the little engines a pain to keep running, especially at idle. You can put a wrap on the head to aid in maintaining operating temps if you find it too difficult to get temp in it.

    Sent from my DROID BIONIC

  4. #4
    RC Qualifier
    Join Date
    Jun 2011
    Location
    Fredericksburg, VA
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    301
    Is it ok to also break in the motor during the winter. I want to get a Jato 3.3 for Christmas and I was wondering if it is okay to break in and tune in the 35-50F weather.
    Powered by Castle.....

  5. #5
    RC poster
    Join Date
    Nov 2013
    Location
    Lafayette
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    11
    Quote Originally Posted by PowerDemon View Post
    Is it ok to also break in the motor during the winter. I want to get a Jato 3.3 for Christmas and I was wondering if it is okay to break in and tune in the 35-50F weather.
    Same question I came on here to ask. I assume tuning will be more difficult due to the lower temps.
    Last edited by Never Satisfied; 11-21-2013 at 03:02 PM.
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  6. #6
    Marshal Double G's Avatar
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    May 2008
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    Putting the water on the hot stuff
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    9,697
    Quote Originally Posted by PowerDemon View Post
    Is it ok to also break in the motor during the winter. I want to get a Jato 3.3 for Christmas and I was wondering if it is okay to break in and tune in the 35-50F weather.

    Yes. Your question was answered in detail in the Jato forum.
    The Super Derecho

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