Cold weather=more horsepower
 

Is it my imagination, or does weather seem to affect the rotary more than other engines? When it's hot (over 85) my car runs like a total dog. If I drive that night when it's around 65, it seems like the car has about 10 - 15 more hp. I know the general rule is something like a 1% gain in hp for every 10 degrees cooler it is. It seems to me like there would have to be an 80 - 100 degree change in temp to affect hp that much. Is my car just weird, or do you guys experience similar phenomena? Oh, by the way, my car is completely stock, so you can eleminate the open-air-element-in-a-hot-rotary-engine-bay theory.

thas how it is with Tii's, dont kno y its like that with n/a's

funny u should post this, i was thinking the same thing today. It was blazing outside where i live, at least it seemed like it. I think it was the hottest day of the year here, and anyways my car just wasnt performing like it does at night, or cold weather. Granted i had a full tank of gas, and A/C blasting, but still, it shouldnt have been lagging that bad, should it? *Sighs* Maybe i need a graveyard shift job so i can drive at night...hmm...less traffic, more people wanting to race, not a bad idea *note to self, drive more at night*

it should be the same with all engines! its something to with the mositure in the air cold days it will run better than hot and it should the best when its raining!

Hey guys, its basic physics. When the temperature is lower, the density of air or rather of the various gases that constitute "air" is bigger, which means more molecules of each gas per cubic measurement unit (whichever you like). Which in turns means more oxygen for your engine...

And yes, this applies to all internal combustion engines.

Yep... definate difference.
Especially if you don't have a cold air box. Thats really exaggerates it. I posted a few days ago about how much of a diference mine made when I took it out for a few hot days....
And of course the A/C makes a difference.... we don't have torquey V8's!

Do you know how much the ECU corrects for temperatue extremes?? (via input form the thermosensor) around 60%!!!!
That's a LOT of correction! Up to 60% more fuel going in at very low temps...

It is the same with all cars. The colder the air the better the combustion... Drag cars can actually go lean on cold weather...

nope nope like The Ace said its the same with all internal combustion engines
His explination is the best,when it comes to engines and understanding how and why they get fast it all goes back to basic physics.