Will CAI increase or decrease gas mileage? - Toyota Nation Forum : Toyota Car and Truck Forums


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3rd & 4th Generation (1992–1996 & 1997–2001) Toyota Camry Discussion for years: 1992-1996 & 1997-2001 Topics of discussion range from fuel economy, safety, modifications, performance all involving America's favorite family car, the Toyota Camry.

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Old 06-17-2011, 02:16 PM   #1 (permalink)
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Will CAI increase or decrease gas mileage?

I have searched this forum and the net and have seen alot of opinions but not facts from people who have actually installed CAI's. I have a 1998 Camry with a 5S-FE and am considering purchasing and installing one. Never mind my reasons, I just want to hear from people who have done it. What problems have you had? What brand did you install? Did you take it back out because of MPG? Thanks all!
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Old 06-17-2011, 04:45 PM   #2 (permalink)
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I don't think you have any change in fuel economy. If anything a little more gas mileage because there Isnt as much air restriction?
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Old 06-17-2011, 04:54 PM   #3 (permalink)
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i'm pretty sure a good CAI is a win-win. you get better airflow, less restriction and a cooler air charge with no added fuel intake.
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Old 06-17-2011, 08:09 PM   #4 (permalink)
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you will absolutly loose MPG after a CAI install. but NOT for any technical reason. your gonna love teh sound it provides and find yourself going into higher RPMs and heavier throttle then before. I promise!

just FYI...youll have to build one for a 5sfe, they dont make one, at least not that I've seen in the past years.
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Old 06-18-2011, 06:49 AM   #5 (permalink)
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Quote:
Originally Posted by csharp100 View Post
I have a 1998 Camry with a 5S-FE
You already have a factory installed CAI with ample air flow for your engine.
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Old 06-18-2011, 02:43 PM   #6 (permalink)
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3rd Generation

I agree with Bigbird, you will lose mpg on a CAI, because you will step on the gas more to hear "cool" engine sounds while your driving around, even just normally. That is assuming you are kind of a perfomance enthusiast.
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Old 06-18-2011, 02:54 PM   #7 (permalink)
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I have a cai on my 95 and get 32 mpg hwy
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Old 06-18-2011, 08:38 PM   #8 (permalink)
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Quote:
Originally Posted by Mister_Perkins View Post
I have a cai on my 95 and get 32 mpg hwy
Damn, 32?

My 95 V6 is lucky to get 24-25 highway....ive been averaging 20-21 lately

Maybe there is something else going on with mine tho....I just hit 340,000 miles
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Old 06-18-2011, 08:41 PM   #9 (permalink)
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Dang 340k ! Nice mang!

I get about 26 mpg 50/50 normally.

On the open highway is where I get 32

I just went to Dallas a few weeks ago and that's how I know lol.
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Old 06-18-2011, 08:49 PM   #10 (permalink)
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Quote:
Originally Posted by sk8ersublime View Post
Damn, 32?

My 95 V6 is lucky to get 24-25 highway....ive been averaging 20-21 lately

Maybe there is something else going on with mine tho....I just hit 340,000 miles
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Originally Posted by Mister_Perkins View Post
Dang 340k ! Nice mang!

I get about 26 mpg 50/50 normally.

On the open highway is where I get 32

I just went to Dallas a few weeks ago and that's how I know lol.
Yeah Brandon you should see Sk8ersublime's car, I have.

It's absolutely Cherry!
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Old 06-18-2011, 10:31 PM   #11 (permalink)
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Quote:
Originally Posted by sk8ersublime View Post
Damn, 32?

My 95 V6 is lucky to get 24-25 highway....ive been averaging 20-21 lately

Maybe there is something else going on with mine tho....I just hit 340,000 miles
Chad, you are the reason why I have no problem moding my car at 235k miles
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Old 06-18-2011, 11:17 PM   #12 (permalink)
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Quote:
Originally Posted by Stillrunning View Post
You already have a factory installed CAI with ample air flow for your engine.
this is true, but that motor sounds so good, its a crime toyota didnt let it sing a little.

Quote:
Originally Posted by sk8ersublime View Post
Damn, 32?

My 95 V6 is lucky to get 24-25 highway....ive been averaging 20-21 lately

Maybe there is something else going on with mine tho....I just hit 340,000 miles
damn, where the hell have you been? awesome to hear ya still got the cam.
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Old 06-19-2011, 10:41 AM   #13 (permalink)
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Originally Posted by eyeball96 View Post
Yeah Brandon you should see Sk8ersublime's car, I have.

It's absolutely Cherry!
yea.....ive let it go to hell a bit...I havent washed it in like a year....and a tiny piece of plastic broke off the center console now when ever I bump it, the ring around the shifter pops up.....My rear door sensors do not work, and I have no trunk light anymore as my hockey gear ripped the Cathodes down one day :\...oh and i hate my stereo.

I was gonna detail it yesterday, but after doing the wife's gen4, which took like 5 hours, I didnt want to think about cleaning again. I bought all of the stuff tho, so perhaps next weekend, especially if I can make it to the meet in 2/3 weeks.
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Old 06-19-2011, 12:56 PM   #14 (permalink)
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Quote:
Originally Posted by Mister_Perkins View Post
I don't think you have any change in fuel economy. If anything a little more gas mileage because there Isnt as much air restriction?
You're right about not being able to see any change but the valves are still gonna be the greatest restriction when not at WOT so that won't matter either. Technically there might be a imperceptible decrease because cool air has less energy by definition, so the difference between the pressure of the crankcase and the expanding piston would be imperceptibly greater, but either way it's nothing.

On a side note, that's one advantage of EGR. Letting something besides air into the cylinder reduces the difference in pressure between it after the valve has closed and the crankcase, so the engine doesn't have to do as much work against the rotating as the pressure in the cylinder drops when moving down after the valve has closed. A big disadvantage is knock, so that's why manufacturers are moving towards cooled EGR. It allows more gas into the cylinder w/o a risk of knocking and that reduces part throttle pumping losses.
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Old 06-19-2011, 01:15 PM   #15 (permalink)
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unless u get a tune afterwards :p
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