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There is no scientific report nor evidence but based on my tuner advice, I become to believe the intake air temperature of around 40 degrees C is the optimal temperature. He has done a lot to turbo tuning on various cars and he has concluded based on his experience, around 40 degrees C will produce the maximum power.
Too cold intake temperature will end up in too rich fuel/air ratio thus black muffler end.
I am not sure how our direct injection management is handling it but I am experiencing power drop in the current cold weather.
My previous cars were NA cars. They produce more power in the cold weather. I had no confidence of the tuner advice until I had experienced the power drop in the recent cold weather.
May be something else is the cause of the power drop. I am in quest of the cause.
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