Right now, per computer, car has 36 mpg +/-.2. I was thinking about changing the air intake. My car is usually between 2500 and 3000 rpms. My question is, for those of you with aftermarket intakes, what is the ecomomy change, generally, good or bad?

Thanks

 

neither...youll need less throttle(hardly noticeable), but the same amount of air is getting in as before on that slightly decreased throttle...and theres still going to be the same AFR....really the only way an intake will help/hurt performance is that you'lll wanna hit the gas more to hear it

 

I agree. I thought it would help me, but now I gas it more so I can hear the sound....sounds great! But yeah, the idea backfired on me. I get worse gas mileage now.

 

I totally disagree.

IF you can drive exactly the same you will see economy gains with an intake. anything you can do to help the engine breathe better will result in more effeciency. and it will be significant gains, 3 mpg or so is a reasonable estimate. a restrictive intake makes the engine work harder to inhale, that extra work is wasted fuel. sure the air to fuel RATIO is unchanged, and you could (unsucessfully) argue that with less air you will use less fuel,but the reality is that you will see an increase in fuel economy.

same is true on the exhaust side. stock I couldn't get above 37mpg. now I'm consistently seeing 39mpg.

but if you start driving the car harder, which you will be tempted to i'm sure, you can forget about any gains at all.

 

where are you guys getting 39mpg from? i'm seeing 28.9 combined and high thirtys on the e-way. injen cai and corsa sport installed.

 

I'm getting about 22.5, so I'm not one to talk.

 

Ha yea when i was still a delivery driver with pizza hut i was getting like 25 at best in town...and like 38 was the best when i drove to Penn last summer

 

silver, i installed the ebay short shifter last night. It's wicked cool, for alot less money. I like it!

 

Wohoho. 39 MPG? And here I was happy with my 25... But are you guys mostly on the highway or city? We have stopsigns and lights here every 1/4 mile though.

 

lol how is it possible to get below 28?? lol i beat on mine and i get about 30mpg all day long

 

..x2

 

i was getting low 26's before i layed off the super-spirited driving, damn opec and their gas prices.

 

if you drive the same, you will get better mileage. end of story. the only people that don' get more better mileage are the ones that step on the gas more. i went up an average of 2 mpg when i put my custom intake on. doesn't sound like much, but that's equal to one free gallon every fillup. pays for itself in about a month or 2.

 

I had my car at under 8 mpg You just have to go full throttle from 0-105 and watch the mileage meter go down really fast

 

i cant imagine buying an intake and having it pay for itself in gas haha

 

He said he put on a custom intake, prob like $50.

So if you get a aftermarket intake it will probably take a year or more to pay for itself.

 

i average 2 mpg better with my custom intake. that equals 1 free gallon every fill up. so my 40 dollar mod will pay for itself after about 13 fill ups.

 

Thank you all, I will most likely be installing a new intake in the near future and hope to see gains. 95.5% of my driving is highway with speeds from 55 in the city and 75 up here where I live, and the times in the morning that I go I usually dont get too much traffic, in the afternoon, it takes me 20 mins to get 6 miles.

 

When I put my Injen intake on the other night, I got 94.6 MPG!....... when I reset my fuel mileage and put it in neutral down a hill.... right now I'm at around 37, and I was at 35 before putting it on.

 

i had a GMPP i went from 36 to 41.6

 

Conventional Gasoline Engines are Air Throttled.

If you reduce the intake tract restriction by modification the engine makes more power and more speed. The only way to slow the vehicle to the previous speed is to reintroduce the same amount of intake restriction. We usually do this by closing the throttle blade until we have exactly the same intake restriction as before. This results in the same pumping loss and fuel mileage as before (assuming the same AFR). If you are gaining mpg from intake side modifications alone (at less than full throttle) its from changes in AFR not restriction.

Now a fuel throttled Diesel or DFI Stratified Charge Gasoline Engine is a whole different ballgame. As a matter of fact the reason that a Diesel gives better fuel efficiency is primarily due to the reduced pumping losses from the lack of an air throttle.

 

alright ihave 2 questioons i dont really know much about cars buthow hard is it to install a cold air intake and also without voidin the factory warrenty in doing so and second part what would be a good quality cai to buy for a reasonable amount