ORIGINAL: Jim Thomerson
What is the theoretical argument for running more nitro in colder weather? When the air is cold it is both denser and dryer than in hot weather and therefore your engine sucks in more oxygen with each revolution. Thus you need to go a click or two richer so that the alcohol
xygen ratio remains as you like it. So I would expect the usual fuel to run better in cold weather than in hot weather.
Jim
Either way works well. It is well known that more nitro content increases engine heat, hence when it's cold, the engine is still running warmer than with a lower nitro content.