Welcome to the North American Subaru Impreza Owners Club Wednesday December 17, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Built Motor Discussion

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 01-20-2013, 12:28 PM   #26
I WANT AN STI
Scooby Specialist
 
Member#: 79983
Join Date: Jan 2005
Chapter/Region: MAIC
Location: va beach
Vehicle:
2005 STI
Aspen White

Default

Well idle air fuel is normal than. Its hovering right around 14.5 to 14.9 at idle.
* Registered users of the site do not see these ads.
I WANT AN STI is offline   Reply With Quote
Old 01-20-2013, 12:47 PM   #27
marios03wrx
Scooby Specialist
 
Member#: 33593
Join Date: Mar 2003
Chapter/Region: MAIC
Location: Chesapeake, VA
Vehicle:
2002 WrX-ShAgNwAgOn
that is 05 WrX Power'd

Default

Cool.... Hopefully it was the charcoal canister that was affecting your fuel mileage. :-)
Then u can sell me your civic. :-)


Mario
marios03wrx is offline   Reply With Quote
Old 01-20-2013, 12:55 PM   #28
I WANT AN STI
Scooby Specialist
 
Member#: 79983
Join Date: Jan 2005
Chapter/Region: MAIC
Location: va beach
Vehicle:
2005 STI
Aspen White

Default

Haha. Yea im not so sure I will ever get rid of the civic. I went 33 days without filling it up and when i did it cost me 34 dollars. Thing is unbelievable on gas. If i really push it I can cross the 420 mile barrier to the tank. Its amazing.
I WANT AN STI is offline   Reply With Quote
Old 01-21-2013, 10:41 AM   #29
RemlapaN
Scooby Newbie
 
Member#: 58251
Join Date: Mar 2004
Chapter/Region: Tri-State
Location: Northeast PA
Vehicle:
2004 Sti
GT35R 530whp @ 27psi

Default

I definitely think it's something specific to your car or driving habits. I have a very similar mod list to you (built motor,278 cams, 52lb/min turbo, 850cc injectors, etc)...

And I get about 15-20mpg city, 25-28 mpg HWY. Of course, this means driving the car like a responsible person and doing like 70-75 on the highway. If you start hot dogging around and getting into boost, that will quickly change to 10mpg.

If you want fuel economy, drive it like you would a fuel efficient car. I typically average about 275 - 300 miles per tank in mine - and that includes abusing it multiple times per fillup.

For the most part, mods make a motor more efficient. But when you start getting into the throttle, you're making a lot more power and using more fuel to get there. If you dont use the power, you wont use the fuel (unless something is broken).
RemlapaN is offline   Reply With Quote
Old 01-21-2013, 02:06 PM   #30
I WANT AN STI
Scooby Specialist
 
Member#: 79983
Join Date: Jan 2005
Chapter/Region: MAIC
Location: va beach
Vehicle:
2005 STI
Aspen White

Default

If I was getting that kind of mileage I would certainly not have any concerns, I would be quite happy. Its definitely not my driving habits, I pretty much stay out of boost unless I need to pass someone. Im a firefighter/medic and have had a perfect driving record for nearly 16 years, I am not some idiot kid who boosty boosts beetween every stoplight and such. I never do more than 5 mph over the speed limit as I cannot get tickets in my line of work.

Im hoping its an 02 sensor or something that is throwing the mileage off, Im just gonna go ahead and suck it up and buy new front and rear ones and download the datalogging program so I can send in my results for someone to review.
I WANT AN STI is offline   Reply With Quote
Old 01-21-2013, 02:53 PM   #31
marios03wrx
Scooby Specialist
 
Member#: 33593
Join Date: Mar 2003
Chapter/Region: MAIC
Location: Chesapeake, VA
Vehicle:
2002 WrX-ShAgNwAgOn
that is 05 WrX Power'd

Default

Before you buy 2 new sensors, there is a way to check the sensors are in the appropriate voltage range. I've seen threads on it in the past. I think there are programs that also put out the voltage reading so no need to play w/ a multi-meter.

I understand your frustration, but since u r trying to save money, i think you shouldn't throw money at the problem. Investigate more and drive the civic till you figure it out.

Just my 0.02
marios03wrx is offline   Reply With Quote
Old 01-21-2013, 08:41 PM   #32
I WANT AN STI
Scooby Specialist
 
Member#: 79983
Join Date: Jan 2005
Chapter/Region: MAIC
Location: va beach
Vehicle:
2005 STI
Aspen White

Default

Do you have a specific link to a thread of you have seen in the past about it ?. That would be appreciated.
I WANT AN STI is offline   Reply With Quote
Old 01-22-2013, 03:04 AM   #33
marios03wrx
Scooby Specialist
 
Member#: 33593
Join Date: Mar 2003
Chapter/Region: MAIC
Location: Chesapeake, VA
Vehicle:
2002 WrX-ShAgNwAgOn
that is 05 WrX Power'd

Default

Let me see what i can dig up...
marios03wrx is offline   Reply With Quote
Old 01-23-2013, 05:52 PM   #34
marios03wrx
Scooby Specialist
 
Member#: 33593
Join Date: Mar 2003
Chapter/Region: MAIC
Location: Chesapeake, VA
Vehicle:
2002 WrX-ShAgNwAgOn
that is 05 WrX Power'd

Default

I couldn't find the exact thread i saw this done, but ran into some other possible solutions you could try. Here is a short thread http://forums.nasioc.com/forums/show....php?t=2281766
marios03wrx is offline   Reply With Quote
Old 01-25-2013, 04:13 PM   #35
I WANT AN STI
Scooby Specialist
 
Member#: 79983
Join Date: Jan 2005
Chapter/Region: MAIC
Location: va beach
Vehicle:
2005 STI
Aspen White

Default

Just a quick check as this may be related to the slightly discomfortable smell coming from the engine.




Is that a breather port ? Im assuming it should be covered cause its caked in grime all around that area.



Also talked with agile and they said the same thing you guys did. No need to detune the car or swap back to stock stuff,i should be getting better fuel mileage than stock. They just said something is severely wrong. Vaccum leak. Fuel leak. Faulty 02,fuel connection leak etc etc. I guess i just need to run it down and tear the car apart.
I WANT AN STI is offline   Reply With Quote
Old 01-25-2013, 05:08 PM   #36
marios03wrx
Scooby Specialist
 
Member#: 33593
Join Date: Mar 2003
Chapter/Region: MAIC
Location: Chesapeake, VA
Vehicle:
2002 WrX-ShAgNwAgOn
that is 05 WrX Power'd

Default

Lmk if want a second set of eyes. Or come to the meet Sat and i can show ya how the hoses should be hooked up.
I wonder if the breather to the PVC & the other one on the passenger side is connected.?

Can u take pics of the pvc location & passengers side breather?

Mario
marios03wrx is offline   Reply With Quote
Old 01-25-2013, 06:48 PM   #37
I WANT AN STI
Scooby Specialist
 
Member#: 79983
Join Date: Jan 2005
Chapter/Region: MAIC
Location: va beach
Vehicle:
2005 STI
Aspen White

Default

Once i put my son to bed ill try and find the other side. I would come to the meet but i have to leave for work at 5 and work till noon the next day. You guys meet at 4 right ?. But yes would love a second set of eyes. Think im gonna start taking stuff apart so i can take closer looks at the fuel connections.
I WANT AN STI is offline   Reply With Quote
Old 01-25-2013, 07:35 PM   #38
marios03wrx
Scooby Specialist
 
Member#: 33593
Join Date: Mar 2003
Chapter/Region: MAIC
Location: Chesapeake, VA
Vehicle:
2002 WrX-ShAgNwAgOn
that is 05 WrX Power'd

Default

Pm me your number... I dont have anything goin on til the meet then a fight.

Mario
marios03wrx is offline   Reply With Quote
Old 01-25-2013, 09:09 PM   #39
I WANT AN STI
Scooby Specialist
 
Member#: 79983
Join Date: Jan 2005
Chapter/Region: MAIC
Location: va beach
Vehicle:
2005 STI
Aspen White

Default

I have my kid all day until the wife gets home around 4. Wont be doing anything with the car till possibly sunday afternoon unfortunately.
I WANT AN STI is offline   Reply With Quote
Old 01-25-2013, 09:39 PM   #40
marios03wrx
Scooby Specialist
 
Member#: 33593
Join Date: Mar 2003
Chapter/Region: MAIC
Location: Chesapeake, VA
Vehicle:
2002 WrX-ShAgNwAgOn
that is 05 WrX Power'd

Default

Ok pm me sun if u want.
marios03wrx is offline   Reply With Quote
Old 01-26-2013, 02:23 AM   #41
ByeBye4g63t
Scooby Newbie
 
Member#: 290896
Join Date: Aug 2011
Location: Phoenix, Az
Vehicle:
2004 STi, FOR SALE
PSM

Default

I average 14-16mpg in the STi regularly (no longer the DD however) and that's with at least one pull each time I drive it. Make sure your air filter is clean, your plugs are fresh, quality gas, fresh oil, equal tire pressure and a GOOD alignment. When is the last time you had your fuel filter changed? Definatly check your alignment if you haven't done it recently, having even slighly too much toe-in or toe out can really screw with your fuel economy.
ByeBye4g63t is offline   Reply With Quote
Old 01-26-2013, 10:07 AM   #42
I WANT AN STI
Scooby Specialist
 
Member#: 79983
Join Date: Jan 2005
Chapter/Region: MAIC
Location: va beach
Vehicle:
2005 STI
Aspen White

Default

air filter is brand new with less than 100 miles on it, plugs may need to be changed. I use shell 93 since its supposedly really good fuel. Oil change has less than 500 miles, synthetic used after the initial break in of the motor. Alignment was done in march 2011 after the wheels were added and the suspension was installed. Camber kit added as well and car was lowered with a four wheel alignment, car drives straight as an arrow. I will replace the fuel filter and go over my vaccum connections, all my fuel lines and fix that breather port/pcv issue.
I WANT AN STI is offline   Reply With Quote
Old 01-26-2013, 12:12 PM   #43
kellygnsd
Scooby Guru
 
Member#: 32669
Join Date: Feb 2003
Chapter/Region: SCIC
Location: Rancho C
Vehicle:
2007 2.34LR, EFR7670
LINK G4 hybrid STi

Default

Quote:
Originally Posted by ByeBye4g63t View Post
I average 14-16mpg in the STi regularly (no longer the DD however) and that's with at least one pull each time I drive it. Make sure your air filter is clean, your plugs are fresh, quality gas, fresh oil, equal tire pressure and a GOOD alignment. When is the last time you had your fuel filter changed? Definatly check your alignment if you haven't done it recently, having even slighly too much toe-in or toe out can really screw with your fuel economy.
That's still not great mileage unless you're rocking a gt35 or bigger. I would average 20 mpg on a head/cam hybrid with 272s and a GT30R turbo. I hit my 7500 rpm redline at least once daily. No more than 75-80 mph on the freeway but I would get to 75 really quick.
kellygnsd is offline   Reply With Quote
Old 01-26-2013, 12:30 PM   #44
I WANT AN STI
Scooby Specialist
 
Member#: 79983
Join Date: Jan 2005
Chapter/Region: MAIC
Location: va beach
Vehicle:
2005 STI
Aspen White

Default

If I can average 20mpg I would be pretty ecstatic. I have the daily driver civic so when I have time I will be tearing the sti down and inspecting everything, than replacing stuff afterward.
I WANT AN STI is offline   Reply With Quote
Old 02-09-2013, 04:01 PM   #45
I WANT AN STI
Scooby Specialist
 
Member#: 79983
Join Date: Jan 2005
Chapter/Region: MAIC
Location: va beach
Vehicle:
2005 STI
Aspen White

Default

So after poking around a bit i found this.





I can't recall if that is for the stock egt probe or for an o2 sensor. Trying to nail this stuff down. And input would be appreciated. Thanks.
I WANT AN STI is offline   Reply With Quote
Old 02-09-2013, 04:43 PM   #46
SubieLuvin
Scooby Specialist
 
Member#: 248202
Join Date: May 2010
Chapter/Region: MWSOC
Location: Columbus, Ohio
Vehicle:
2013 WRX Sedan
SWP

Default

Is that a resistor jammed into it?
SubieLuvin is offline   Reply With Quote
Old 02-09-2013, 04:54 PM   #47
I WANT AN STI
Scooby Specialist
 
Member#: 79983
Join Date: Jan 2005
Chapter/Region: MAIC
Location: va beach
Vehicle:
2005 STI
Aspen White

Default

nope, it looks like it is the end of a male clip, solid piece of metal that just plugs in.

trying to figure out why its there and what it goes to.
I WANT AN STI is offline   Reply With Quote
Old 02-09-2013, 08:07 PM   #48
SubieLuvin
Scooby Specialist
 
Member#: 248202
Join Date: May 2010
Chapter/Region: MWSOC
Location: Columbus, Ohio
Vehicle:
2013 WRX Sedan
SWP

Default

Quote:
Originally Posted by I WANT AN STI View Post
nope, it looks like it is the end of a male clip, solid piece of metal that just plugs in.

trying to figure out why its there and what it goes to.
I'd contact the previous owner
SubieLuvin is offline   Reply With Quote
Old 02-09-2013, 08:50 PM   #49
dads_cruizzzer
Scooby Specialist
 
Member#: 61724
Join Date: May 2004
Location: Southern California
Vehicle:
04 FXT
silver

Default

Looks like the PCV bypass for a silicon turbo inlet mod or the DRL. I did both on mine.

See last page - http://www.perrinperformance.com/sha.../pspint400.pdf
dads_cruizzzer is offline   Reply With Quote
Old 02-09-2013, 11:48 PM   #50
I WANT AN STI
Scooby Specialist
 
Member#: 79983
Join Date: Jan 2005
Chapter/Region: MAIC
Location: va beach
Vehicle:
2005 STI
Aspen White

Default

Certainly looks like it after reading that.
I WANT AN STI is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 06:29 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.