Previous Thread
Next Thread
New Reply
Print Thread
Joined: Nov 2002
Posts: 489
CRBN BLU
Senior Member
CRBN BLU Mar 20, 12:32am - #420984 

Senior Member
2002 Toyota Celica GT

Joined: Nov 2002
Posts: 489
Hampton, VA
Is my CAI lowering my gas mileage?

Ok, so when I got my GT brand new, my mileage was averaging in the low 30's per gallon. Granted, 75% of my driving is done on the highway. The only true power adders I have installed are my AEM CAI and my TRD exhaust. Lately I have noticed that my mileage has been significantly lower. I'm talking in the mid-low 20's!! So then I went into troubleshooting mode. I cleaned my Air Filter, cleaned the MAF, changed the spark plugs, cleaned the throttle body, and changed the oil. I have kept up with all the maintenance. Yet, my mileage doesn't improve. I do have roughly 62,xxx miles on my 2002 car.

I just got back from Atlanta cruising down I-95. I got 300 miles with 3/4 tank of gas. That's high twenties, maybe even 30 mpg. It should be better.

So now I'm thinking it's the CAI. My hypothesis is that since the AEM unit is a quarter inch larger in diameter than the stock air Intake, more air is getting into the engine. With more air means the MAF is telling my car to add more fuel to go with the air. I've read up on the Blue Bomber hybrid Intake setup, and I'm wondering if that improves gas mileage. Because technically, the only amount of air that is getting into the engine is the amount of air the throttle body is letting in, which is sized to math the 2.5" Intake pipe of the stock unit. So I'm thinking if I hybridize my Intake so that the MAF is mouted on a piece of 2.5" pipe after the 2.75" AEM pipe, the MAF will start to act correctly by adding the right amount of fuel for the right amount of air.

Does this make sense? Has anyone solved this problem?

[Linked Image]
"Everything that has a beginning, has an end."
-The Oracle
Joined: Oct 2003
Posts: 1,154
Larry_GTS
Specialist
Larry_GTS Mar 20, 2:38am - #420985 
2003 Yellow/Red Toyota Celica
Specialist
2003 Toyota Celica

Joined: Oct 2003
Posts: 1,154
Texas
I was thinking the same thing when I had my CAI on my other Celica . oh well i'm working on a new project 98 Towncar smile
Joined: Jun 2004
Posts: 1,696
Polykarb
Metal Storm 2040
Polykarb Mar 20, 4:22am - #420986 

Metal Storm 2040
2000 Toyota Celica

Joined: Jun 2004
Posts: 1,696
Tampa, Florida
I don't know, why worry about it? We drive INLINE-4's, i don't think it matters. I get gas basically everyother week during a normal week in my 6sp GTS, and it doesn't bother me.

FF TWINCAM BEAUTY: CELICA
Joined: Aug 2002
Posts: 1,096
Eman
Black Sheep
Eman Mar 20, 4:48am - #420987 

Black Sheep
2000 Toyota Celica GT

Joined: Aug 2002
Posts: 1,096
818, CA
more fuel or air = more hp, so ill let you thinka bout it, and plus our cars get almost 30 miles/gallon why do you care...

Ima TuRD fa life
Joined: Mar 2005
Posts: 31
Jughead
Member
Jughead Mar 20, 9:38am - #420988 

Member
2001 Toyota Celica

Joined: Mar 2005
Posts: 31
Pa
Only had my GTS a short time and got 33MPG city the first week. Granted not inner-city but still it's share of stop & go. I'm ecstatic. My Excursion gets 12! cry Don't even want to know what my BB Vette gets. grin
Joined: Nov 2004
Posts: 81
veilside_gt
Member
veilside_gt Mar 20, 10:08am - #420989 
2002 Spectra Blue Toyota Celica GT
Member
2002 Toyota Celica GT

Joined: Nov 2004
Posts: 81
Hudson Bay, Sask.
im gettin 40mpg in my GT
Joined: Nov 2002
Posts: 489
CRBN BLU
Senior Member
CRBN BLU Mar 20, 6:52pm - #420990 

Senior Member
2002 Toyota Celica GT

Joined: Nov 2002
Posts: 489
Hampton, VA
Originally Posted by Eman
more fuel or air = more hp, so ill let you thinka bout it, and plus our cars get almost 30 miles/gallon why do you care...


I care because my car was once making 30mpg, but now is around 20mpg. Do the math. That means I'm using 33% more fuel at a faster rate. So instead of filling up once a week, now I'm filling up twice a week. At $20 per fill up, that means in a year I am spending $1040 more on gas than I use to. That's money that could be used for more mods.

And though you may be right with your little equation, how much more horsepower am I really getting, 2? 3? 4? The Celica's computer is robbing the car from producing better horsepower than what people get from adding Intakes and exhausts.

[Linked Image]
"Everything that has a beginning, has an end."
-The Oracle
Joined: Apr 2004
Posts: 124
AznClubRSX
Member
AznClubRSX Mar 20, 8:27pm - #420991 

Member
2000 Toyota Celica

Joined: Apr 2004
Posts: 124
Maryland
mine gone down from 28 to 25mpg...and it's a 2000 gts...i don't think i drive that hard...dunno y
Joined: Nov 2004
Posts: 638
mrluilou
Senior Member
mrluilou Mar 20, 9:01pm - #420992 

Senior Member
2001 Toyota Celica GT

Joined: Nov 2004
Posts: 638
Palmdale, California
in that case crbn blue dont do any engine mods so you wont waist more gas then and take of the CAI so you could get your 30 mpg again oh yeah your exhaust too & sell them

[Linked Image]
Joined: Feb 2005
Posts: 164
WhiteCeli
Member
WhiteCeli Mar 20, 9:29pm - #420993 
Member

Joined: Feb 2005
Posts: 164
HI
Originally Posted by Eman
more fuel or air = more hp, so ill let you thinka bout it, and plus our cars get almost 30 miles/gallon why do you care...


was gonna say the same about for the reason of the gas loss. Maybe now you have a CAI you push the gas harder because it response better too?
Joined: Aug 2004
Posts: 169
hs2g
Member
hs2g Mar 20, 9:35pm - #420994 
1997 Red Toyota Celica GT
Member
1997 Toyota Celica GT

Joined: Aug 2004
Posts: 169
St. Cloud, Minnesota
why are you guys telling him to do this and that and trying to be a smart "alex". If you don't know the answer to the question then don't post.

CRBN BLU, I don't know the answer to your question but maybe try and do a full fuel system tune up.
Joined: Sep 2004
Posts: 349
ForceFed
Member
ForceFed Mar 20, 11:03pm - #420995 

Member
2002 Toyota Celica

Joined: Sep 2004
Posts: 349
Southern Utah
when my CAI is on I get like 22 - 24 mpg, when my stock box is on I get like 25 - 28 mpg. More air = more fuel = more power = more gas = more fill ups = more money spent.

cant say ive done that before... ahh crap
Joined: Dec 2003
Posts: 50
gtsbill01
Member
gtsbill01 Mar 20, 11:12pm - #420996 
2001 Absolutely Red Toyota Celica
Member
2001 Toyota Celica

Joined: Dec 2003
Posts: 50
A-Town, New York
I get 30-34 mpg highway with my gts and i have an exhaust and SRI.
Joined: Mar 2005
Posts: 21
EastCoastRollaS
Member
EastCoastRollaS Mar 20, 11:38pm - #420997 

Member
2003 Toyota Corolla S

Joined: Mar 2005
Posts: 21
i have a CAI on my corolla and i cant tell a diff in the gas milage...its pretty much the same. in your case though, if your really worried about it, just get an Safc2, but if your that worried about gas, why do you even have an Intake?
Joined: Jan 2004
Posts: 311
GTSbyTRD
Member
GTSbyTRD Mar 21, 12:58am - #420998 

Member
2000 Toyota Celica

Joined: Jan 2004
Posts: 311
Ft. Wayne, Indiana
Run some fuel injector cleaner and clean for MAF sensor.

I noticed a difference! thumbsup

"I didnt realize girls had that much plumbing down there. I saw a diagram of it and it looked like a map for six flags."
Joined: Nov 2002
Posts: 489
CRBN BLU
Senior Member
CRBN BLU Mar 21, 2:37am - #420999 

Senior Member
2002 Toyota Celica GT

Joined: Nov 2002
Posts: 489
Hampton, VA
Originally Posted by mrluilou
in that case crbn blue dont do any engine mods so you wont waist more gas then and take of the CAI so you could get your 30 mpg again oh yeah your exhaust too & sell them


That has to be the stupidest fucking thing I've read in a long time. Believe me, I know the deal: cause and effect. Cause: I add performace mods to the car. Effect: power goes up and fuel efficiency goes down. Next time, keep your $.02 to your self.

Again, the only reason I'm so concerned is not that there IS a difference, but at how LARGE the difference is. I'm concerned about a larger problem.

[Linked Image]
"Everything that has a beginning, has an end."
-The Oracle
Joined: Feb 2004
Posts: 1,716
celicafourotwo
Specialist
celicafourotwo Mar 21, 3:05am - #421000 

Specialist
2000 Toyota Celica

Joined: Feb 2004
Posts: 1,716
Nebraska
i dunno about ur gas problem but i do know that gas prices is f*cking ridiculous @ 2.26/gal here..i'm sure you guys are paying atleast 3/gal..man that sux..i fill the tank every single week..

Originally Posted by pesho01
Question:
Whenever my car is at a full stop or even in park the RPM never sits on 0. what does this mean?
Joined: Nov 2002
Posts: 489
CRBN BLU
Senior Member
CRBN BLU Mar 21, 6:49pm - #421001 

Senior Member
2002 Toyota Celica GT

Joined: Nov 2002
Posts: 489
Hampton, VA
For regular (87 octane) here in Tidewater, VA it's averaging about 1.99/gal. For premium (93 octance) it's about 2.19/gal. And it's on the way up. I'm fortunate enough to have a GT and only need regular thumbsup

[Linked Image]
"Everything that has a beginning, has an end."
-The Oracle
Joined: Nov 2004
Posts: 160
spectraGTS
Member
spectraGTS Mar 21, 7:42pm - #421002 

Member
2001 Toyota Celica

Joined: Nov 2004
Posts: 160
LC, New Mexico
Gas milage changes with the seasons. Gas in the winter is not the same gas in the summer. There are different additives for different temperatures outside. I know that this affects the MPG of cars, but I don't think that it would be a 10 MPG drop. Maybe like 3 MPG, but not 10. I put my Injen CAI on, and my 28 MPG never changed.
Joined: May 2004
Posts: 528
renfield90
Senior Member
renfield90 Mar 21, 8:10pm - #421003 

Senior Member
2001 Toyota Celica GT

Joined: May 2004
Posts: 528
Tempe, AZ
There are many things affecting fuel mileage besides your Intake. I don't know all the dynamics about how air pressure, temperature, and humidity affect an engine, but I'm pretty sure it does. Driving style can also make big differences (my first tank ever on my car was 23 MPG, because I floored it at every light, but now I'm getting around 30 with slightly more than half of my driving on the highway); it's possible that some weird quirk in everyone else's driving habits is forcing you to spend more time with your foot down, without you necessarily realizing it. Any traffic jams, different city driving conditions, unusual traffic light timings, or even pump problems (not filling all the way) can cause problems with your gas mileage. I'm sure there are other factors I don't even know of.

Going from 30 to 20 MPG is a pretty big drop though.

No offense, but maybe you're not calculating it properly? Always good to rule out the easy stuff...

I agree with whoever recommended a fuel injector cleaner, but otherwise keep an eye on it. If it gets worse than maybe you do have a problem.

How many weeks have you gotten this mileage? When did you last change your spark plugs?
Joined: Feb 2004
Posts: 430
e_degala
Senior Member
e_degala Mar 21, 8:43pm - #421004 

Senior Member
2000 Toyota Celica

Joined: Feb 2004
Posts: 430
northeast
i'd assume with the addition of the CAI that you'd be driving more aggressively (higher rpms & more acceleration) rather than shifting at 3000 rpms for better fuel economy.

if you're so concerned 'bout "miles per gallon" then changing your driving habits will drastically alter your consumption (however reducing you to turtle's pace).

the cost of gasoline isn't that expensive (more than recent times but still just nickels & dimes) and if your budget is extremely limited you have to either increase your revenue or reduce driving time.

Import Wars: 5/21, 6/18, 8/06, 10/08
Plymouth Meet: 5/28
HIN Boston: 4/30
Joined: Nov 2002
Posts: 489
CRBN BLU
Senior Member
CRBN BLU Mar 21, 10:21pm - #421005 

Senior Member
2002 Toyota Celica GT

Joined: Nov 2002
Posts: 489
Hampton, VA
First, I have an automatic, which should provide better gas mileage for the Celica. Second, when I determined I was getting 30+ mpg, I was driving the same way I am now. As far as seasons are concerned, I would think that winter driving would be better for the car since the cold air helps keep the engine cool and provides a denser charge for the incoming Intake air.

I just got gas today. Took 10.702 gallons of gas for roughly 250 miles of traveling. Using higher math, that's 23.36 mpg. Granted, I did drive a bit rougher than usual these past couple days. It was a race weekend, so I spent some time with OverDrive off.

I'm going to try the fuel injector cleaner and go from there. Any reccomendations on brand, product, etc?

[Linked Image]
"Everything that has a beginning, has an end."
-The Oracle
Joined: May 2003
Posts: 1,296
bmw52786
Specialist
bmw52786 Mar 22, 12:04am - #421006 

Specialist
2001 Toyota Celica GT

Joined: May 2003
Posts: 1,296
Orlando/Gainesville, FL
crbn blu, it sounds like you are startin to pms, we are only tryin to help you!
we dont need all these sarcastic comments like "the stupidest fucking thing i've read" and "using higher math", you want to hear about higher math be a engineering major like me and take the highest maths there are!

i say again, we are only tryin to help you solve this problem, if you dont like some of the answers or dont agree with them, you dont need to trash them!

have you taken it to the dealer and asked them yet since we cant seem to find whats wrong and worst comes to worst go back to stock and get your 30mpg back!

IF YOU POST IT -- THEY WILL COME
Joined: Nov 2002
Posts: 489
CRBN BLU
Senior Member
CRBN BLU Mar 22, 5:23am - #421007 

Senior Member
2002 Toyota Celica GT

Joined: Nov 2002
Posts: 489
Hampton, VA
Originally Posted by bmw52786
crbn blu, it sounds like you are startin to pms, we are only tryin to help you!
we dont need all these sarcastic comments like "the stupidest fucking thing i've read" and "using higher math", you want to hear about higher math be a engineering major like me and take the highest maths there are!

i say again, we are only tryin to help you solve this problem, if you dont like some of the answers or dont agree with them, you dont need to trash them!

have you taken it to the dealer and asked them yet since we cant seem to find whats wrong and worst comes to worst go back to stock and get your 30mpg back!


Woah, son. The reason I got mad is because rather than try to help, some people post stupid comments that are of no help. That's why I get mad. It's an all too common problem on the boards. Do I need to read, "If you care so much about your gas mileage why bother with performance mods," and much of the contents of your post. And for future reference, I am an Applied Mathematics major with a double minor in Biology and Political Science, so I can confidently say that I've taken all your math classes, and then some. So cut back on the ego trip!

[Linked Image]
"Everything that has a beginning, has an end."
-The Oracle
Joined: May 2004
Posts: 528
renfield90
Senior Member
renfield90 Mar 22, 7:03pm - #421008 

Senior Member
2001 Toyota Celica GT

Joined: May 2004
Posts: 528
Tempe, AZ
I hate to say it, but do a search to find a good brand of fuel injector cleaner. My mechanic (whom I would trust my life and my car to) used BG 44K or something like that.

Have you changed your spark plugs at 60K miles? I read up on this and bad spark plugs can cause a drop in gas mileage.
Joined: Aug 2003
Posts: 399
SCOTT03
Member
SCOTT03 Mar 31, 1:49am - #421009 
2000 Black Toyota Celica
Member
2000 Toyota Celica

Joined: Aug 2003
Posts: 399
Buies Creek/Sanford, NC
haha, i read this like last week and was contemplating it the other day while i was driving. A few things people said are wrong i believe, 1) CAI does not increase airflow to engine, a N/A engine is only gonna take in the amount of air of the displacement each revolution, and the air is not going to be forced into the engine like turbo application, so the same amount of air will enter the engine. Yes, colder air is slightly denser but not to the effect it will manipulate gas milage. 2) the typical problem with CAI is running lean and that is what the "blue bomber mod" helps to correct by providing an accurate reading, if your getting poor gas milage it is from running rich not lean.

[Linked Image]
Joined: Nov 2002
Posts: 489
CRBN BLU
Senior Member
CRBN BLU Mar 31, 1:55am - #421010 

Senior Member
2002 Toyota Celica GT

Joined: Nov 2002
Posts: 489
Hampton, VA
I figured out what my problem is. Turns out, I need a new O2 sensor. Since it's on the outs, it probably is affecting my gas mileage. This is what I was worried about in one of my earlier posts: that something more was wrong. The reason I know I need a new oxygen sensor is that my car threw a CEL and it lead back to the sensor. So now I need to replace the sensor and hopefully that will return my mileage.

[Linked Image]
"Everything that has a beginning, has an end."
-The Oracle
Joined: Aug 2003
Posts: 222
trdcelica13
Member
trdcelica13 Mar 31, 2:02am - #421011 
2000 Black Toyota Celica GT
Member
2000 Toyota Celica GT

Joined: Aug 2003
Posts: 222
NJ
the colder the weather, the more gas you will use. air becomes more dense in the winter and therefore, requires more fuel for a proper combustion to suite the computer. the opposite goes for summer, which is why you will get a slightly faster time in the winter than the summer, and also a little more hp in the winter. depending on when you did the mods, this could be a reason why, and also, a manual will get better gas mileage.

http://www.xpozedprojex.net
No amount of therapy will ever make this ok.<img src="/ubbthreads/images/graemlins/poke.gif" alt="" />
Joined: Nov 2002
Posts: 489
CRBN BLU
Senior Member
CRBN BLU Mar 31, 2:09am - #421012 

Senior Member
2002 Toyota Celica GT

Joined: Nov 2002
Posts: 489
Hampton, VA
Originally Posted by trdcelica13
the colder the weather, the more gas you will use. air becomes more dense in the winter and therefore, requires more fuel for a proper combustion to suite the computer. the opposite goes for summer, which is why you will get a slightly faster time in the winter than the summer, and also a little more hp in the winter. depending on when you did the mods, this could be a reason why, and also, a manual will get better gas mileage.


Not on our car, for my GT:
MILEAGE ESTIMATES GT (VVT-i) GTS (VVTL-i)
Manual (city/highway) 28 / 33 23 / 32

Automatic (city/highway) 29 / 36 23 / 30

[Linked Image]
"Everything that has a beginning, has an end."
-The Oracle
Join the conversation - Register now or Sign in to add your comment


Moderated by  isaac 

Customize Your Toyota CelicaPrivacy Policy · About · Contact
CelicaHobby.com is an independent Toyota Celica enthusiast website. CelicaHobby.com is not sponsored by or affiliated with Toyota Motor Sales, USA, Inc. in any way. The Toyota and Celica names and logos are trademarks owned by Toyota Motor Sales, USA, Inc.
© CelicaHobby.com, 2001-2016