05 sti CEL? - Subaru Enthusiasts Car Club of the Sierras

murphy · 2007-04-14, 02:38 PM

Ok I need a pretty fast answer on this STI owners...05 sti..with 3 inch HKS Turbo back (no cat)..throwing a cel...(I know its because of the no cat) what I want to know is are the 05 sti's prone to over boost with that set up? and what does the ecu do? IE send car into limp mode. also what is a fix for the over boosting problem..If I remember right stock boost is 14.2 psi...but what does it taper down to?
ONE more...where would be the best place to tap into for a boost gage?..off the manifold on the left, back side next to Throt. body or "T" off the fitting on the turbo?

Kevin M · 2007-04-14, 04:30 PM

Flashing CEL/cruise is overboost. Simple CEL on is probably P0420 Cat Inefficiency.

murphy · 2007-04-14, 04:48 PM

thanks kevin...I just found out that his cel is flashing...nothing was done to his cruise...now next question is whats the fix for the over boost? ecu reflash, ported wg?

Kevin M · 2007-04-14, 05:08 PM

Port the wastegate, get flashed, add a cat back in. Or get a GT30.

murphy · 2007-04-14, 05:21 PM

thanks again

Double Phister · 2007-04-14, 05:37 PM

1. Before you do anything get the code read.
2. Please tell me the car has some form of engine management upgrade.

murphy · 2007-04-14, 05:43 PM

kid has not brought the car back yet..cel is flashing...and no the damn fool does not have any management...I told him when he ordered the stuff that sti's like to over boost when you change out the downpipe. But hay you know how young kids are now..."I want it now"
his mods are hks ssq bov (not recirculated WTF) HKS turbo back. still has stock air box so he isnt leaning the hell out of his car YET...says he plans on getting a flash soon.

2007-04-14, 02:38 PM	#1
murphy EJ22 Join Date: Jun 2004 Location: RENO Posts: 484 Car: 03 evo, 06 R6	05 sti CEL? Ok I need a pretty fast answer on this STI owners...05 sti..with 3 inch HKS Turbo back (no cat)..throwing a cel...(I know its because of the no cat) what I want to know is are the 05 sti's prone to over boost with that set up? and what does the ecu do? IE send car into limp mode. also what is a fix for the over boosting problem..If I remember right stock boost is 14.2 psi...but what does it taper down to? ONE more...where would be the best place to tap into for a boost gage?..off the manifold on the left, back side next to Throt. body or "T" off the fitting on the turbo?

2007-04-14, 04:30 PM	#2
Kevin M EJ22T Join Date: Sep 2003 Location: Reno Posts: 9,445 Car: '93/'01 GF6, mostly red Class: 19 FP	Flashing CEL/cruise is overboost. Simple CEL on is probably P0420 Cat Inefficiency. __________________ FWD is the new AWD

2007-04-14, 05:08 PM	#4
Kevin M EJ22T Join Date: Sep 2003 Location: Reno Posts: 9,445 Car: '93/'01 GF6, mostly red Class: 19 FP	Port the wastegate, get flashed, add a cat back in. Or get a GT30. __________________ FWD is the new AWD

2007-04-14, 05:37 PM	#6
Double Phister EJ22 Join Date: Mar 2005 Location: Elk Grove, CA Posts: 450 Car: 2005 WRX STi "I'm sideways and in control... I look good."	1. Before you do anything get the code read. 2. Please tell me the car has some form of engine management upgrade. __________________ Dan - '05 Black WRX STi. My Mods

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2007-04-14, 04:48 PM	#3
murphy EJ22 Join Date: Jun 2004 Location: RENO Posts: 484 Car: 03 evo, 06 R6	thanks kevin...I just found out that his cel is flashing...nothing was done to his cruise...now next question is whats the fix for the over boost? ecu reflash, ported wg?

2007-04-14, 05:21 PM	#5
murphy EJ22 Join Date: Jun 2004 Location: RENO Posts: 484 Car: 03 evo, 06 R6	thanks again

2007-04-14, 05:43 PM	#7
murphy EJ22 Join Date: Jun 2004 Location: RENO Posts: 484 Car: 03 evo, 06 R6	kid has not brought the car back yet..cel is flashing...and no the damn fool does not have any management...I told him when he ordered the stuff that sti's like to over boost when you change out the downpipe. But hay you know how young kids are now..."I want it now" his mods are hks ssq bov (not recirculated WTF) HKS turbo back. still has stock air box so he isnt leaning the hell out of his car YET...says he plans on getting a flash soon.