Welcome to the North American Subaru Impreza Owners Club Thursday February 23, 2017
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Pre-2002 Factory Turbo Powertrain

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 06-18-2010, 05:23 AM   #1
Cstmboxermotorsports
Scooby Specialist
 
Member#: 103340
Join Date: Dec 2005
Location: Canada
Vehicle:
1992 RHD WRX

Default EJ20G overboost/fuel cut after Apexi intake

I installed an apexi intake on my 1992 WRX

Now I hit like 1.1 bar and the car is falling on its face. The most I ever hit pre intake was .9 bar (creeped to that)

Not sure why its doing it, if anyone could help that would be awesome

PS:

Car is stock except for 3" turbo back and the intake.
* Registered users of the site do not see these ads.
Cstmboxermotorsports is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 06-18-2010, 07:07 AM   #2
ncarn8
Scooby Specialist
 
Member#: 71419
Join Date: Sep 2004
Default

Quote:
Originally Posted by Cstmboxermotorsports View Post
I installed an apexi intake on my 1992 WRX

Now I hit like 1.1 bar and the car is falling on its face. The most I ever hit pre intake was .9 bar (creeped to that)

Not sure why its doing it, if anyone could help that would be awesome

PS:

Car is stock except for 3" turbo back and the intake.
What turbo are you running? Have you douvle checked all your wastegate control lines are correct?
ncarn8 is offline   Reply With Quote
Old 06-18-2010, 10:28 AM   #3
Cstmboxermotorsports
Scooby Specialist
 
Member#: 103340
Join Date: Dec 2005
Location: Canada
Vehicle:
1992 RHD WRX

Default

Quote:
Originally Posted by ncarn8 View Post
What turbo are you running? Have you douvle checked all your wastegate control lines are correct?
16g, its stock. and yes
Cstmboxermotorsports is offline   Reply With Quote
Old 06-23-2010, 11:37 AM   #4
DuoMaxwell
Scooby Specialist
 
Member#: 24565
Join Date: Sep 2002
Location: Misawa Japan
Vehicle:
2000 V6 STi RA #856
Blue

Default

I cannot give you a technical reason behind your issues, but it happens a lot on the G with the Apexi intake.

I think the MAF cannot handle it, on my old ride I went back to stock box, reset the ECU, and things were fine!!
DuoMaxwell is offline   Reply With Quote
Old 06-23-2010, 01:08 PM   #5
sense of nature
Scooby Guru
 
Member#: 112759
Join Date: Apr 2006
Chapter/Region: MWSOC
Location: In the V hole!
Vehicle:
2002 STi Mikey Tuned
SexyRP

Default

^^ Agreed too much flow prolly
sense of nature is offline   Reply With Quote
Old 07-07-2011, 09:11 PM   #6
250R
Scooby Newbie
 
Member#: 118646
Join Date: Jun 2006
Vehicle:
2004 Dubyaroxorz!

Default

Would an AVCR solve something like this? Same issue here.
250R is offline   Reply With Quote
Old 07-08-2011, 02:44 AM   #7
pmugabi
Scooby Newbie
 
Member#: 280926
Join Date: Apr 2011
Default

Yes, a boost controller would fix this
pmugabi is offline   Reply With Quote
Old 07-14-2011, 10:01 AM   #8
luka
Scooby Newbie
 
Member#: 194742
Join Date: Nov 2008
Chapter/Region: E. Canada
Location: Waterloo
Vehicle:
1993 Impreza WRX JDM
Silver

Default

hey dude, you're hitting overboost fuel cut, you have a few options

1) use a resister (not sure what value(s) though)
2) use a silicon diode in-series with the signal wire. that will drop
the signal by 0.7V. any surplus store will have these
3) use a Zener diode around 4.7V along with the silicon diode and that
will prevent any fuel cut (dangerous in case you really do over boost)
4) Discount the MAP vac line entirely (won't throw codes)
5) get Rob's ECU Tune

I'd suggest 5) since you'll get a lot more than just no more fuel cut but if you're budget then 2). A diode is better than a resister since a resister's voltage drop will depend on the current while a silicon diode will always be 0.7V. I assume you want to install it with (+) side going towards the ECU and (-) going to the MAP sensor.
luka is offline   Reply With Quote
Old 07-15-2011, 10:01 AM   #9
watchthisspace
Scooby Newbie
 
Member#: 273336
Join Date: Feb 2011
Default

Firstly, reset your ECU, then go what everyone has suggested
watchthisspace is offline   Reply With Quote
Old 07-18-2011, 01:02 PM   #10
luka
Scooby Newbie
 
Member#: 194742
Join Date: Nov 2008
Chapter/Region: E. Canada
Location: Waterloo
Vehicle:
1993 Impreza WRX JDM
Silver

Default

Cstmboxermotorsports, any luck buddy?
luka is offline   Reply With Quote
Old 07-20-2011, 08:10 AM   #11
1995REX
Scooby Newbie
 
Member#: 201655
Join Date: Jan 2009
Chapter/Region: MWSOC
Location: Iwakuni Japan & South Bend,IN
Vehicle:
2001 TT Legacy GT-B
Blue

Default

You could use and HKS FCD (Fuel Cut Defender) they are out there and allow you to dial up how much you want to push past stock i had one before i went to Robs 550 Tune it did the trick for the few months i used it.
1995REX 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
Fuel Cut After Motor Swap mtskibum16 Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 4 05-27-2010 09:55 PM
Overboost + fuel cut after tune = Bad JdMS13 UTEC 8 05-06-2010 01:37 PM
ej20g hesitation/fuel cut problems grasshopper2.5rs Pre-2002 Factory Turbo Powertrain 33 12-23-2009 06:09 AM
Overboost fuel cut Zackbo Engine Management & Tuning 1 05-21-2004 12:45 PM
Fuel cut after right turns? WRXavier Warranty Issues & SOA Problems 5 04-16-2003 10:10 PM

All times are GMT -4. The time now is 02:44 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2017 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.