In a vehicle particularly a honda what air intake temp. Leads to better fuel economy?
I have looked and looked through the web and found that for sure that cold air leads to more power but i have also found that cold air intakes increase mpg's. Yet i have read that warm air makes the engine use less fuel so that it would lead to more mpg's also. I also have looked at engine designs to where the air box intakes are located and some vehicle locate the intake close to the radiator AKA warm air. And some behind the headlight AKA cold air. I'm just wondering which air temp helps the most for fuel effieciency.
Don't get Honda many mechanical problems, I had to learn the hard way. Sell it quickly
The change in fuel economy between cold air & warm air will be so slight that I doubt you would notice the difference.
How much did you actually look at the setups? Just because the box is close to something, does not mean it is ingesting hot air… Remember, the front end of the car is a high pressure area, hot air will not be moving forward or even sideways.
No matter how cold you get it, the colder the better. The more air a cylinder can ingest, the more efficient it will be. Cold air is denser, thus makes more power. The general rule of thumb is that every 10 degrees of intake temp lost, is 1HP. As you can see, in any feasible application, that isn't going to be very significant. Say underhood is 150, and outside air is 50 (not likely anyway) theoretically you are talking 10HP gained. The underhood vs ambient temps are normally around 50* different, so 5HP, give or take.
Increasing airflow can't really increase economy. All modern vehicles shoot for a 14.7:1 air/fuel ratio during cruise/idle conditions, which is optimium for emissions. If you are able to get more air in there, the PCM will add fuel to keep that ratio. You can't run rich or lean without adverse affects. Note that if you increase efficiency, through the IAC the PCM will simply reduce the amount of air coming into the engine to keep RPM's consistent with throttle pedal (without modifying the fueling), since the IAC can easily handle the minimal change an air intake swap makes.
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