My car LOVES cool weather! Wish I could get 65 degree air all the time.

[dr-rjp]

The difference between how my car drives in 75 degree weather versus 65 degree weather is like night and day.

I know that the colder the air, the denser it is, but I never thought that a ten degree differential would make such a difference.

I know this sounds like a no-brainer, but I wonder if there is such a thing as a temperature "sweet spot" for the engine?

Does anyone have a graph that maps engine temperature or ambient air temperature against horsepower?

Also, how much of a drop in intake air temperature does a true CAI (cold air intake) produce, and does that value change depending on outside air temperature and engine operating temperature?

See, I was thinking that not only would a CAI not be of much help in cold weather, but it might actually interfere with proper engine operation at really low temperatures.

[audtatious]

Mine seems to like mid-30's the best.

[dr-rjp]

Mine seems to like mid-30's the best.

You could say that your car's engine "likes to be rich."

[Q45tech]

The software contains a coolant temperature vs ignition retard section to protect against overheats and reduce knock...............on some this starts at 195F and 200F on others. Turning the AC on signals ecu that it is summer. Gasoline composition shifts in October to winter blend which often has a high btu content and create more torque vs Summer blends.

Always make sure the cooling system is kept as new to avoid these excessive temperatures.

[dr-rjp]

The software contains a coolant temperature vs ignition retard section to protect against overheats and reduce knock...............on some this starts at 195F and 200F on others. Turning the AC on signals ecu that it is summer. Gasoline composition shifts in October to winter blend which often has a high btu content and create more torque vs Summer blends.

Always make sure the cooling system is kept as new to avoid these excessive temperatures.

Great post! Do they have a winter blend for Florida, too? I never thougth about that.

SPEAKING about keeping the cooling system clean, I tried to flush out mine today, but I COULD NOT FIND THE STOPCOCK ON MY RADIATOR!

I swear that I looked for it but no luck. The stock radiator has it on the driver's side, but I have a replacement radiator which means that it could be anywhere.

But, unless it is hidden below the under engine cover, I do not knw where it could be.

HELP?