for some reason my car seems to be the quickest and most responsive at around 70 - 75F degrees, compared to 55F. now theoretically this doesnt make since since cooler air is more dense.... anyone else have anything to share or how does you ride do it different temps?

 

Was the car up to full operating temp both times?

 

for sure, i baby it like none other when the engine is cold or ALMOST warm, never use more than like 1/3 throttle and never go above 3000rpms

 

Seems quickest and more responsive based upon what? Just how it "feels?"

 

yeah, unfortunately i dont have any way to tell if this is just me or if it really is quicker

 

Humidity would also play a part in the seperate days.

 

ive noticed the same thing with my maxima. when its over 75degrees my car runs like a charm...below 50...ugh...

 

Gonna agree with Fr33way on this one, the humidity will make the air heavier and require more work on the cylinders and air filter to compress the air and squeeze the moisture out of it. Best conditions are about 40% humidity and 70-80 deg F. You will get the most power out of the engine.

 

As a general rule, you get more power out of your engine the colder out it is - not at 70-80F, unless there are other issues at work.

 

not possible...you will always get better performance at colder temps. Each gulp of air your engine takes will have more O2 molecules. THe MAF will sense this and more gas will be fed and youll get more power.

 

Definately true but how often do you get cold temps that are realitively non-humid. The moisture in the air is what screws it over in cold conditions. Normally in colder conditions during the winter, the humidity is standard at about 80%. Thats here in Ohio, but when you get a day that is about 40-50% then its a good day. Think physics here guys. The more moisture in the air the less nitrogen and oxygen that will be available to the engine. Now an ideal setup would be a supercooled pure oxygen tank that fed the engine directly. But since non of us have the thousands of dollars or the nerve to do that for a mere power gain of 1 hp for every 7 degrees cooler its not going to happen. Your thinking is correct but the meteorology of it just doesn't work out.

 

You said quote: "Best conditions are about 40% humidity and 70-80 deg F. You will get the most power out of the engine." That statement is simply untrue as you've just admitted.

It is more rare to have conditions of low humidity and low temperature as you eventually stated and which is completely true, but your earlier statement that 70-80F and 40% humidity is "best" for power is false. When the conditions exist - and they do exist occasionally - you will get more power out of an engine at lower temperature and lower humidity, and higher air pressure. Also known as a higher DA which I suspect you already know since you seem to know a bit about meteorology.

 

Everyone is saying engine performance at colder temps are better which is true but what about tranny oil and or motor oil? If it hasn't been changed in a while or if you are not running synthetic that could be the difference, once the temps warm the oil gets for lack of better words "thinner, less resistant". Like if you live in a colder temp you should be running a thinner oil kinda thing.

 

My car runs the best cold, when it get's up to operating temp it's kinda sluggish no matter what the temp outside is.

 

Yeah for the most part my car seems to pull hardest when it's cold and dry out... for obvious reasons, all previously stated.

 

well here in FL when it was winter (an hour or so) my car pulled the hardest it ever has ;]

 

Ambient pressure, humidity, temperature ...

AKA, Atmospheric conditions.