WannaBFast

iTrader: (16)

did this happen to anyone else?

the only thing i notice was after my car was warmed up nicely... the tone was the same but it was not as loud... can anyone explain this?... i think its because the air is colder.... if that is the case does that mean thats what my car will sound with a CAI.... my engine is totally stock... except for my exhaust

mwwhonda

iTrader: (3)

cold air = dense air = more hp = less noise because the car strains less...winter is the best

Tiki

as long as there's no black ice[IMG]i/expressions/beer_yum.gif[/IMG][IMG]i/expressions/laugh2.gif[/IMG]

JoeyOKC

iTrader: (7)

dense air equals horsepower[IMG]i/expressions/face-icon-small-confused.gif[/IMG] Maybe I'm wrong, but I thought less dense air equals horsepower. and I thought cold air was less dense. Maybe it's different from N/A to F/I as far as dense or less dense air equalling horsepower. It just seems to me that less dense air would flow better resulting in more power.

Explain how dense air equals horsepower.

doublins

dense air = more oxygen per unit volume = more power
the goal of any one trying to increase power is to increase the amount of oxygen in the combustion chamber.
Nitrous does this chemically.
F/I does it mechanically by compressing air.

And yes, colder air is denser, by the laws of thermodynamics. Maybe you were thinking of ice, which is actually LESS dense than water, but only due to special properties of the water molecule that make it so. In general, for gasses- colder = denser.

See boyles law.

doublins

oh, and this does not change between F/I and N/A.... once again, I think you are getting confused. perhaps you meant COMPRESSION. For power in a N/A car, it is common to raise compression. However, for a F/I car, to prevent unsafe detonation, it is common to lower compression at higher boost levels.

However, the overall goal as far as adding power is to flow as much oxygen through the engine as is possible and practical, without damaging the car.

Note- some will attest, however, to a F/I car running a little smoother in places like denver, where the air is colder and thinner.

For all practical purposes, though, just accept that dense air contains more oxygen per unit volume and is desireable to have.

-C

WannaBFast

iTrader: (16)

so if i add a CAI my car will sound like that all the time?

CoupeStylz

iTrader: (4)

Yeah I can attest to the fact that colder air provides more power, after the oil is warm that is. Last night when I was out driving it was -16 degrees celcius.

WannaBFast

iTrader: (16)

but i asked if colder air changes teh sound of the engine....

Bartkat

It's the snow, man. The sound isn't bouncing off the pavement. The snow is absorbing the sound. Notice how much quieter all the other cars are too.

As for cold air, yes it is denser, and cold moist air is even denser, but it don't make that much difference to the sound of your exhaust.

Try and rev it up on bare ground and then try it on 4 inches of snow with no load. That will tell you something.