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08-01-2011, 10:25 PM | #1 |
Scooby Newbie
Member#: 185525
Join Date: Jul 2008
Chapter/Region:
SCIC
Location: Fresno California
Vehicle:1993 Impreza wagon White |
EJ20G target boost 12.8 only hitting 10. Problem?
Here is my problem:
On my 99% stock EJ20G ( K&N drop in, 05 sti DP) im only hitting 10 psi at WOT. So i thought it might have been the factory boost control. I can hear it clicking when i rev the motor up. And if i unplug it it only hits spring pressure ( 7 PSI on stock TD05H) So then i thought maybe the ECU was screwed up somehow or mixed up with a wagon 10 psi ecu. So i just recived a Z4 ecu (12.6 target boost) and it too only hits 10 PSI Now im stumped. Any ideas? Thanks in advance -mikey b
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08-01-2011, 10:44 PM | #2 |
Scooby Guru
Member#: 159682
Join Date: Sep 2007
Chapter/Region:
NESIC
Location: Maine
Vehicle:1995 WRX 2015 F150 |
You added a second cat to the downpipe. Could be the restriction.
Clean the boost control solenoid, plug in the green connnectors under the dash so it clicks and spray brake cleaner through it. Be sure all the hoses are in good shape, properly routed and the restrictor is in place. Or just put on a mbc and be done with it like everyone else does. You can turn it up to 14-15 psi then. |
08-01-2011, 10:50 PM | #3 |
Scooby Newbie
Member#: 185525
Join Date: Jul 2008
Chapter/Region:
SCIC
Location: Fresno California
Vehicle:1993 Impreza wagon White |
yeah i just pulled the line off the wastegate and it pulls to 15 easy, i lifted at around 5k right as it touched 15 and my warning light went off
so gotta be the boost control so just clean it up and try again? |
08-01-2011, 10:50 PM | #4 |
Scooby Newbie
Member#: 185525
Join Date: Jul 2008
Chapter/Region:
SCIC
Location: Fresno California
Vehicle:1993 Impreza wagon White |
and the downpipe only has the primary cat, the second cat is gutted and missing
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08-01-2011, 10:53 PM | #5 |
Scooby Guru
Member#: 159682
Join Date: Sep 2007
Chapter/Region:
NESIC
Location: Maine
Vehicle:1995 WRX 2015 F150 |
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08-01-2011, 10:57 PM | #6 |
Scooby Newbie
Member#: 185525
Join Date: Jul 2008
Chapter/Region:
SCIC
Location: Fresno California
Vehicle:1993 Impreza wagon White |
ive got one. So 14 is safe? Im on 91 in CA and ambient temps of 100 degrees
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08-01-2011, 11:06 PM | #7 |
Scooby Guru
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Join Date: Sep 2007
Chapter/Region:
NESIC
Location: Maine
Vehicle:1995 WRX 2015 F150 |
The fuel cut is 15.5 or so.
If you are worried about set it to stock boost levels. The Z4 is a tame ecu compared to most of the other jdm ecus. You'd probably be ok. |
08-02-2011, 12:24 AM | #8 |
Scooby Specialist
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MWSOC
Vehicle:56 Belair Pro Street |
im going full noob here, but does anyone have a comprehensive vacuum routing diagram?
i recieved an engine in shambles |
08-06-2011, 12:19 AM | #9 |
Scooby Newbie
Member#: 184543
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Chapter/Region:
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Vehicle:JDM RHD GM8 Type R 02 6 Speed Bugeye |
Hey Mikey... Something is definitely going on with your boost control solenoid. My car NEVER saw below 12 psi with that ecu. I actually would go to 14 or so and then taper down a couple of psi. It could actually also be bad gas OR knock sensor because these ecu's are very smart and will pull timing and lower boost if you are knocking badly.
This is directly from Enduring Solutions website in the UK regarding the OEM JECS ecu: "Closed Loop Knock Control is arguably the most important feature on a road car ECU. Given the variability of pump fuel in the UK, the amount of detonation an engine will experience on different tanks can vary considerably. An ECU equipped with knock control will listen to the output of the knock sensor and retard ignition timing until no more detonation is sensed. The OEM JECS ECU will also richen the mixture and reduce boost pressure if significant detonation is heard. An aftermarket ECU without this facility relies on every tank of fuel being exactly the same as the one it was mapped on or has to be mapped with a safety margin, costing power. Owners of knocklinks will know that activity between tanks of the same type of fuel can vary significantly, which is why knock control is one of the most important features of an ECU. It is very rare for aftermarket ECUs to offer it, even as a cost option. " Enduring Solutions offers a tuneable daughterboard and software combo which turns our ecu's basically into standalones while keeping all the factory safety features of the ecu intact. http://www.enduringsolutions.com/faqs.html Last edited by blkgm8; 08-06-2011 at 12:33 AM. |
08-07-2011, 11:11 AM | #10 | |
Scooby Newbie
Member#: 257043
Join Date: Sep 2010
Chapter/Region:
VIC
Location: Vancouver BC
Vehicle:1993 JDM WRX Wagon Black |
Rather roundabout way to say it sounds like a knock issue.
Quote:
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08-07-2011, 05:46 PM | #11 |
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without the mbc my z4 would run between 10 and 13 psi depending on temp
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08-08-2011, 02:14 AM | #12 |
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Yea... I guess I could have just said it sounds like a knock issue without giving the reasons why to back it up. LOL.
Actually I meant literally when I said had that ecu in my car. He just picked it up from me. I just thought I would chime in with some information that may actually help with his problem. |
08-15-2011, 10:59 PM | #13 | |
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I also need it
Quote:
I can't seem to reach more than .5bar the car feels sluggish I have a new uncracked sti uppipe pretty much a 3" turbo back no known leaks thanks to anyone who can help out Also compression of all 4 cyl is between 170 and 173 PSI |
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08-16-2011, 02:52 AM | #14 |
n00b Moderator
Moderator Member#: 811
Join Date: Jan 2000
Location: WA
Vehicle:2000 RS-Ej20G It tastes like burning |
This is the best I have. It is for a '92 libertyRS EJ20G. It is close to the WRX. One difference that I know of for the vacuum side of things is that there are no purge valves on the JDM WRX.
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08-16-2011, 07:29 AM | #15 |
Scooby Newbie
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Chapter/Region:
E. Canada
Location: Waterloo
Vehicle:1993 Impreza WRX JDM Silver |
libertyRS had a water-to-air intercooler?
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08-16-2011, 12:17 PM | #16 |
Scooby Specialist
Member#: 51480
Join Date: Dec 2003
Chapter/Region:
International
Location: The Netherlands
Vehicle:1984 AM5, 1984 AF1, 1994 BC4, 2015 Outback |
Yes.
Mikey what is your boost gauge reading when the engine is off? Is it exactly 0 or a bit below? That could also explain why you think you're only running 10 whil ein fact you might be running almost 13 above atmospheric pressure. |
08-16-2011, 12:18 PM | #17 |
n00b Moderator
Moderator Member#: 811
Join Date: Jan 2000
Location: WA
Vehicle:2000 RS-Ej20G It tastes like burning |
indeed it did.
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08-17-2011, 12:03 AM | #18 | |
Scooby Newbie
Member#: 225974
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Chapter/Region:
E. Canada
Location: Terrebonne, Qc
Vehicle:2017 WRX World Rally Blue |
Quote:
I'm guessing if you turn the drawing 90 counter clock wise it should be OK? Oh and is there really an O2 sensor cause I have the original dump pipe and it looks like a temps sensor... I now have a brand new greddy downpipe without any holes except for a wideband around where the 2nd cat used to be. thanks. |
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08-17-2011, 12:05 AM | #19 |
Scooby Newbie
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Location: Terrebonne, Qc
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08-17-2011, 06:43 PM | #20 | |
Scooby Newbie
Member#: 257043
Join Date: Sep 2010
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VIC
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Vehicle:1993 JDM WRX Wagon Black |
Quote:
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08-18-2011, 08:41 AM | #21 |
Scooby Specialist
Member#: 51480
Join Date: Dec 2003
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International
Location: The Netherlands
Vehicle:1984 AM5, 1984 AF1, 1994 BC4, 2015 Outback |
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08-18-2011, 11:18 AM | #22 |
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W. Canada
Location: Alberta.
Vehicle:MY98 WRX |
I am having the exact same issue with my 95 WRX STi.
Hitting 10 PSI consistently through every gear. Reset the ecu. All is fantastic. Car runs smooth and pulls very hard, but will not hit its "target" boost. I have been told the stock PSI on these cars is approx. 14 with the ecu in the V2 STi's. I unplugged the line going to the wastegate as well. Boom 15 PSI with ease. Does this mean there is something wrong with the factory boost solenoid? This has been asked but no one has given a straight up answer. Solution: Grab a MBC, set it and forget it at 15 PSI since the factory boost solenoid is clearly on its way out/not working correctly? |
08-18-2011, 02:54 PM | #23 |
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Vehicle:2004 Forester STI White |
By unplugging the line going to the wastegate, you theoretically get infinite boost right?
It is possible that your wastegate actuator is opening too soon but I would tend to say boost controller more (the wastegates rarely fail right?). And even if your wastegate is opening too soon, if you put in the MBC, the wastegate won't see any pressure until the MBC hits its point (unless it's one of those bypass ones). |
08-18-2011, 10:20 PM | #24 | |
Scooby Newbie
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Location: Terrebonne, Qc
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Quote:
I did a boost leak test and I found that the gasket between my plastic turbo outlet pipe to intercooler was squeezed wrong. I fixed it and now I'm getting close to .7 .8 kg/cm2 but car is still VERY slugish much like my 2000 Brighton when the check engine light is on due to a sporadic knock sensor fault (happens when it rains hard). seems like the timing is being pulled. can an ABS light put the ECU in limp mode as mine is on? Last edited by klys; 08-18-2011 at 11:17 PM. |
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08-19-2011, 01:33 AM | #25 |
Scooby Specialist
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Join Date: Dec 2003
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Vehicle:1984 AM5, 1984 AF1, 1994 BC4, 2015 Outback |
Is the speedo working?
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