Has anyone installed a cold air intake on their fit? How much of a boost in efficiency did it yield for you?

 

I installed the K&N intake on my GE8 M/T. I will say that my car is definitely more responsive, takes hills better, and sounds better than stock, but as far as a boost in efficiency I would say it was fairly small, maybe 1-2mpg. But it is hard to say because I also installed the HKS exhaust at the same time and the car breaking in could have played a part in it as well. Right now I average just above q3440 mpg, that is about 50/50 highway/city driving, 50 miles round trip every day. Don't know if I was any help or if I really answered your question, but I am sure there are others on here that can provide you with better results/numbers to go with their installs.

And just to make clear, the K&N intake is a short ram intake not a true cold air intake.

 

Ok I will bite, what does this mean?

 

Well, to be completely honest with you, I have no idea. It was supposed to be just 40. I don't even remember that being there when I posted the reply. Getting old is a bummer.

 

I've had my K&N Typhoon on for over 19k and the only difference is in the winter time where the car has added fuel, I'm told by a VERY reliable source, but the mileage isn't enough for me to worry about it. I've counteracted this by running BP Ultimate fuel and haven't looked back.

Now I'm just waiting for the weather to completely turn the corner and see what mileage will be once its over 60 everyday. Right now though, I'm getting 35 mpg with my car and its got mods, other mods too

 

Shouldn't a cold air intake REDUCE fuel efficiency? It forces cooler air through which makes the fuel/oxygen denser, causing you to burn more. CAI's are for power, not efficiency. I think people get WARM air intakes to boost fuel economy.

 

Yes and no. If you drive the car like you stoled it and enjoy the power yes more air needs more fuel. The mpg comes from getting to speed faster using less rpm and as long as knock isn't present mpg should go up a little. Warm air can cause knock and more losses from evaporated fuel. The idea is that the fuel is cool and when sprayed in to a dense cool air stream and the heat of the pistons evaporate the fuel in the chamber cooling the pistons and more power is produced using less rpm and fuel.

 

Just want to add that in open loop it will run leaner with a cold air intake and thats where the extra power comes. More air in needs exhaust for more air out.

 

All the other vehicles i have had them on it reduced city mpg and gained on highway mpg. Also usually loose TQ down low but gain a bit up high. This is referring to stock motors of course.

 

The whole idea really is the fact that to lower your fuel consumption your engine needs to be making more torque at a given rpm for you to back off the gas pedal. If that is happening by installing a cold air intake, then you get the increases. Given that most engines aren't seeing enough of a temperature delta, they probably aren't doing anything other than making noise and draining your wallet.

Now, at WOT.....different story, but that has nothing to do with fuel economy.

You want gains, look at reducing the leak paths in your frontal area.