Welcome to the North American Subaru Impreza Owners Club Thursday October 23, 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 > Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo)

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 06-09-2004, 12:17 PM   #1
doster82
Scooby Specialist
 
Member#: 61845
Join Date: May 2004
Chapter/Region: RMIC
Location: Salt Lake City
Vehicle:
MY06 Legacy GT 5MT
Regal Blue Pearl

Default Manual Boost Proplems

I just added a K&N HIgh Flow filter and Go Fast Bits atomic manual boost controller to my '04 WRX. It's running just unter one bar (14.5 pounds) and not only is my check engine light on, but the idle is running like it's really rich too. I was thinking of getting the MIL Check Engine Eliminator, but didn't know if this would correct the problem with the idle. Any suggestions? Thanks.
* Registered users of the site do not see these ads.
doster82 is offline   Reply With Quote
Old 06-09-2004, 12:52 PM   #2
overdose
Scooby Specialist
 
Member#: 46399
Join Date: Oct 2003
Chapter/Region: MWSOC
Location: Grand Rapids, MI
Vehicle:
0000 Knows nothing,
about nothing.

Default

CEL is prolly on cause you spiked in 5th, don't run a MBC on a car without engine management... ESPECIALLY not an 04 are you nuts?
overdose is offline   Reply With Quote
Old 06-09-2004, 01:19 PM   #3
doster82
Scooby Specialist
 
Member#: 61845
Join Date: May 2004
Chapter/Region: RMIC
Location: Salt Lake City
Vehicle:
MY06 Legacy GT 5MT
Regal Blue Pearl

Default

Hadn't heard of problems with others systems w/o EM. Think I should remove it?
doster82 is offline   Reply With Quote
Old 06-09-2004, 01:23 PM   #4
RussB
Guest
 
Member#: 43667
Join Date: Sep 2003
Default

yes. the mbc will allow you to hit full boost at partial throttle, in a range where the ECU things you are building much less boost and not providing enough fuel to support what it actually is boosting. that causes lean conditions and very high exhaust gas temps. also, as for MIL eliminators... only run those if you purposefully did something to your car that can cause a CEL like going catless. the light is there for a reason. if you installed an MBC, and the light comes on and the car runs like ass, something is wrong and you should get it checked out instead of deactivating the light.
RussB is offline   Reply With Quote
Old 06-09-2004, 01:25 PM   #5
mrbigisbudgood
Scooby Specialist
 
Member#: 54378
Join Date: Feb 2004
Chapter/Region: South East
Location: Charlotte, NC
Vehicle:
2013 Mazdaspeed 3
Black

Default

You are getting a check engine light and you want to eliminate it? Do you know what code is in the ECU?

Take off the MBC, get your CEL code read (and NOT under warranty), fix your problem, get an Accessport.
mrbigisbudgood is offline   Reply With Quote
Old 06-09-2004, 01:31 PM   #6
doster82
Scooby Specialist
 
Member#: 61845
Join Date: May 2004
Chapter/Region: RMIC
Location: Salt Lake City
Vehicle:
MY06 Legacy GT 5MT
Regal Blue Pearl

Default

Where can I get the Accessport? Est. $?
doster82 is offline   Reply With Quote
Old 06-09-2004, 01:39 PM   #7
Calsoldier
Scooby Newbie
 
Member#: 56538
Join Date: Mar 2004
Chapter/Region: SCIC
Location: San Diego, CA
Vehicle:
2004 WRX
WRB

Default

Can you change boost levels with the accessport?

Oleg
Calsoldier is offline   Reply With Quote
Old 06-09-2004, 01:39 PM   #8
GDR
Scooby Specialist
 
Member#: 34924
Join Date: Apr 2003
Chapter/Region: SCIC
Location: Corona,Ca
Vehicle:
03 WRX Wagon
81 Scirocco S

Default

Quote:
Originally posted by doster82
Where can I get the Accessport? Est. $?
$600, Just drive over to Cobb's. They are right in your town.

oops. Call first and order then drive over a few months later to pick up.
GDR is offline   Reply With Quote
Old 06-09-2004, 01:49 PM   #9
doster82
Scooby Specialist
 
Member#: 61845
Join Date: May 2004
Chapter/Region: RMIC
Location: Salt Lake City
Vehicle:
MY06 Legacy GT 5MT
Regal Blue Pearl

Default

Until then, just take out the MBC, get the ECL checked, and stick it out stock? Can anybody check it w/o it going on my warranty?
doster82 is offline   Reply With Quote
Old 06-09-2004, 02:18 PM   #10
overdose
Scooby Specialist
 
Member#: 46399
Join Date: Oct 2003
Chapter/Region: MWSOC
Location: Grand Rapids, MI
Vehicle:
0000 Knows nothing,
about nothing.

Default

spend a lot of time reading on this forum, i bought mine in october 03 and i've learned quite a bit since then.... bottom line with these cars is engine management first and foremost, then focus on the bolt ons like uppipe/downpipe/exhaust
overdose is offline   Reply With Quote
Old 06-09-2004, 02:38 PM   #11
gr8-wrx
Scooby Newbie
 
Member#: 38411
Join Date: Jun 2003
Location: Antioch, CA
Vehicle:
2003 WRX Sedan
2001 Honda CR-V SE

Default

Quote:
Originally posted by GDR
oops. Call first and order then drive over a few months later to pick up.
gr8-wrx is offline   Reply With Quote
Old 06-09-2004, 03:02 PM   #12
doster82
Scooby Specialist
 
Member#: 61845
Join Date: May 2004
Chapter/Region: RMIC
Location: Salt Lake City
Vehicle:
MY06 Legacy GT 5MT
Regal Blue Pearl

Default

So, although factory boost is way under what the engines can handle, MBC's aren't a good idea until you've got the ECU under control?
doster82 is offline   Reply With Quote
Old 06-09-2004, 03:07 PM   #13
subindiego
Scooby Newbie
 
Member#: 48825
Join Date: Nov 2003
Location: San Diego
Vehicle:
2004 WRX sedan
silver

Default

You should talk with the people at modern garage and Cobb tuning, they are at 4673 s. cherry st. in your home town. They will stear you in the right direction for increasing your HP reliably.
Go to www.cobbtuning.com for more info.

Get engine management, the accessport from cobb is a great first step. Waiting on the AccessPORT sucks but is well worth it. Since you live in SLC you could just have them reflash your ECU with a stage 1 map.
Yes it does raise boost slightly, it also changes the timing and the a/f ratios. It is the combination of these changes together that allows HP to be increased without detriment to reliability.

Raising boost alone can be a risky venture if you are not careful.
subindiego is offline   Reply With Quote
Old 06-09-2004, 03:10 PM   #14
mrbigisbudgood
Scooby Specialist
 
Member#: 54378
Join Date: Feb 2004
Chapter/Region: South East
Location: Charlotte, NC
Vehicle:
2013 Mazdaspeed 3
Black

Default

Quote:
Originally posted by doster82
MBC's aren't a good idea
There ya go.
mrbigisbudgood is offline   Reply With Quote
Old 06-09-2004, 03:22 PM   #15
doster82
Scooby Specialist
 
Member#: 61845
Join Date: May 2004
Chapter/Region: RMIC
Location: Salt Lake City
Vehicle:
MY06 Legacy GT 5MT
Regal Blue Pearl

Default

"you could just have them reflash your ECU with a stage 1 map"

Would I still be able to keep the MBC without it having a detrimental affect on my engine?
doster82 is offline   Reply With Quote
Old 06-09-2004, 03:26 PM   #16
RussB
Guest
 
Member#: 43667
Join Date: Sep 2003
Default

you won't need an MBC with a reflash.
RussB is offline   Reply With Quote
Old 06-09-2004, 03:31 PM   #17
ride5000
Scooby Guru
 
Member#: 32792
Join Date: Feb 2003
Chapter/Region: NESIC
Location: lincoln, ri
Vehicle:
2003 GGA MBP
12.9 / 105+

Default

pull your maf sensor. it is probably liberally coated in the oil that k+n overapplies to the filters as they ship them. clean it.

edit: clean it with non chlorinated brake cleaner. get a ziploc bag, spray cleaner inside, put sensor inside, close bag, shake it around. the brake cleaner comes out with a lot of force and can damage the very thin wire of the maf sensor.

i love my mbc, but putting one on an 04 is not suggested due to the slow transition from closed to open loop fueling. the mbc's very quick response will make detonation almost certain.

jm2c
ride5000 is offline   Reply With Quote
Old 06-09-2004, 03:34 PM   #18
h8ual
Scooby Newbie
 
Member#: 22437
Join Date: Aug 2002
Location: Tennessee
Vehicle:
03 WRX
Black

Default

hey doster...

I have run a MBC for over 40k and it has been no worries. what you probably did was push over 17lbs of boost and then threw the CEL. that is bad but should not cause any real damage to the car. the first thing you should do is crank the boost down to 15lbs. 15.5 max. in 3rd gear! (what are you measuring?) anything more can't be utilized due to the size of the turbo so you will get diminished returns on anything more.

engine mgmnt is not something you have to have to go a little faster. you definitley need it to go a lot faster though.

i run 8.7 in the 1/8 mile with just a boost controller set to 15lbs. and some BFG tires too...

here is how you fix the check engine light.

disconnect battery---with the key turned so the radio and lights will run--then stomp on the brake pedal and purge the last electrons from the system by lighting the brake lights and the CEL should go away. this won't fix your idle problem. don't know what that is.

good luck...
h8ual is offline   Reply With Quote
Old 06-09-2004, 03:45 PM   #19
doster82
Scooby Specialist
 
Member#: 61845
Join Date: May 2004
Chapter/Region: RMIC
Location: Salt Lake City
Vehicle:
MY06 Legacy GT 5MT
Regal Blue Pearl

Default

Thanks h8. I'm gonna run to Autozone to get the CEL checked, but I'll do that. And I checked out the accessport, think I'll head over to Cobb tomorrow. Any more suggestions? I'm actually running 15 pounds at 3rd gear, but do think I spiked it when driving it last night.
doster82 is offline   Reply With Quote
Old 06-09-2004, 03:46 PM   #20
mixup52
Scooby Specialist
 
Member#: 39691
Join Date: Jul 2003
Location: Ogden Utah
Vehicle:
2002 WRX Wagon
White

Default

You really don't need to go to cobb, you could get a UTec and we could help you tune it. We have all the proper equipment to do the tune. Cobb is not the only option. I prefer the Utec myself. The reason is that everytime you upgrade, you need to get it retuned and at 214.00 an hour @ MG - Cobb that gets really expensive.

You can go to Autozone and get the code pulled. Then come back and let the board know what it was, that will help us to determine what the problem might be.

IF you need any other help you can PM me since I am kinda local.

Chris
mixup52 is offline   Reply With Quote
Old 06-09-2004, 04:08 PM   #21
doster82
Scooby Specialist
 
Member#: 61845
Join Date: May 2004
Chapter/Region: RMIC
Location: Salt Lake City
Vehicle:
MY06 Legacy GT 5MT
Regal Blue Pearl

Default

I was actually planning on going with the UTEC initially, I like the idea of the Piggyback, but also like the Cobb just because of ease of use. I've also been working with Scott, Matt, and Vesco over at TDC Motorsport (aka Scoobytuner), and they've been pretty helpful. I could always use your input on these situations, though. So, the general thought is I should remove the MBC, though? Yes/no?
doster82 is offline   Reply With Quote
Old 06-09-2004, 04:48 PM   #22
mixup52
Scooby Specialist
 
Member#: 39691
Join Date: Jul 2003
Location: Ogden Utah
Vehicle:
2002 WRX Wagon
White

Default

Yes.
mixup52 is offline   Reply With Quote
Old 06-14-2004, 08:04 PM   #23
Magman
Scooby Newbie
 
Member#: 40038
Join Date: Jul 2003
Chapter/Region: RMIC
Location: Orem Utah
Vehicle:
2002 Impreza WRX
Blue

Default got ecu?

yes yes.
cobb or utec, thats up to you. i had my ecu reflashed by cobb, and i absolutely loved it. very good for daily drivers, and no worries tuning. later i bought the accessport (150) and i love that too. especially the live boost function. now i have an uppipe and that caused boost fluctuations, so my friends and i jigga rigged a MBC so that my boost is constant. no cel codes. runs fine. in conclusion, get engine managment so the ecu will work for you, and not against... then put on your bolt ons. (plus EM makes all your bolt ons even more effective because you can tune for them)
Magman 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
boosting proplems blackout801 Rocky Mountains Impreza Club Forum -- RMIC 10 03-19-2008 09:43 AM
Is a manual boost controller the best way to add a bit of boost? rsilvers Engine Management & Tuning 3 09-23-2004 09:24 AM
TN: OEM Boost Gauge and manual boost controller - $85 Dracon Private 'For Sale' Classifieds 10 02-20-2004 04:21 PM
Manual boost controller vs Digital boost controler ScoobieSnacks Bay Area Impreza Club Forum -- BAIC 27 02-17-2002 05:28 PM


All times are GMT -4. The time now is 06:15 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.