Colder air flowing over a colder engine has very little to do with this, unless you are starting the car in single digit temperatures. While air temperature contributes, the reason for this is the engine is simulating an electronic choke by limiting air flow (using the drive by wire mechanism) while also increasing the amount of fuel concentration (using the maf sensor input), while also advance the engine timing (using the knock sensor) . This is done so that engine starts in 1 kick and also warms the internal core quickly to sustain a continual engine operation. This also helps get the fluids flowing quicker e.g. engine oil to the crank case. Every modern Nissan engine does this. Once a certain temperature is reached the above mentioned senors bring the engine back to normal operating levels.

For those of you, like myself, who live in sub zero climates, that "BEAST" sound can last a whole lot longer in winter.

-

 

I just noticed this morning that my car does, in fact, seem to sound deeper in the morning. I can't wait to here it when my JWT comes in.

 

That is what I was looking for! Thanks for the expanation. I just wish I could tune my car to run like that all the time.

 

This is also the point at which I would note...

Yes, it sounds neat. Yes, it feels faster. Yes, this feeling diminishes as the engine warms itself (and therefore the surrounding air). Come move to Nebraska, you'll experience that more mornings than you'd really like to.

Please do not beat the sh*t out of your car before it has reached operating temperature.

I repeat:
Don't be "that guy" who's at 7000 rpm with a cold engine.

Just a PSA

 

Thanks for the advice. Dont worry though I am not "that guy". I typically drive very mild untill the engine is warm. Even at 3k RPM I can tell the difference in the sound and the way the car is running.

 

so is it better to run when the engine is still cold...cause i always wait tilll i pass the forth line to actually run my car.