Welcome to the North American Subaru Impreza Owners Club Friday July 25, 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 > 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 01-29-2013, 02:02 PM   #1
coupe-a-loop
Scooby Newbie
 
Member#: 336028
Join Date: Oct 2012
Chapter/Region: VIC
Location: Scuurrvey BC
Vehicle:
1995 v2 sti type ra
Glacier White

Default EJ20G detonation

Hey guys, so I have a 95 sti ra ej20g closed deck. It's running robs 550 tune with 16 psi boost. At peak boost I am having pretty consistent detonation. I am running yellow injectors and a walbro 255 fuel pump. This motor was built around 8000 km ago, runs well and pulls hard just at this higher boost getting detonation. I don't believe this is a fuel deliver or fuel issue as I only use 94 Octane from chevron in Canada. The catch can is brand new as well....I'm out of ideas here guys not an expert by any means but trying to learn. Should I run a colder plug perhaps? I might just turn my boost down in the meantime as I have a grimmspeed manual boost controller, and see if that helps any. Thanks in advance for any advice.
* Registered users of the site do not see these ads.
coupe-a-loop is offline   Reply With Quote
Old 01-29-2013, 02:07 PM   #2
eg33GC
Scooby Specialist
 
Member#: 206851
Join Date: Mar 2009
Chapter/Region: MWSOC
Vehicle:
99 V4
EJ20K RS

Default

stock coil packs i assume?

is your CEL blinking?
eg33GC is offline   Reply With Quote
Old 01-29-2013, 02:11 PM   #3
coupe-a-loop
Scooby Newbie
 
Member#: 336028
Join Date: Oct 2012
Chapter/Region: VIC
Location: Scuurrvey BC
Vehicle:
1995 v2 sti type ra
Glacier White

Default

No actually 2002 coilpacks. CEL blinks yes but only at high boost. I can't even distinguishably hear the knock...although my ear isn't well trained, and the exhaust drowns every other sound out with ease.
coupe-a-loop is offline   Reply With Quote
Old 01-29-2013, 02:36 PM   #4
coupe-a-loop
Scooby Newbie
 
Member#: 336028
Join Date: Oct 2012
Chapter/Region: VIC
Location: Scuurrvey BC
Vehicle:
1995 v2 sti type ra
Glacier White

Default

Hm, after reading the sticky on coil conversion it sounds alot like what rob experienced before he converted. I know for a fact these are converted to 2002, I did not build the motor however I know who did and know the care that was taken on this build. I suppose its possible these new 2002 are now shot?
coupe-a-loop is offline   Reply With Quote
Old 01-29-2013, 05:03 PM   #5
AgentJ17
Scooby Newbie
 
Member#: 306411
Join Date: Jan 2012
Chapter/Region: VIC
Location: Duncan, BC
Vehicle:
1995 STi RA
3-cyl conversion...

Default

Misfire and knock are two entirely different things. Failed coilpacks will cause a misfire. Rob's tune will trigger the CEL when the car detects knock.

You should be able to run a full 18psi with Rob's tune. Maybe get a wideband kit on your car to verify it's getting enough fuel? I think the wrong heat range and gap in spark plugs can cause knock.
AgentJ17 is offline   Reply With Quote
Old 01-30-2013, 03:08 AM   #6
coupe-a-loop
Scooby Newbie
 
Member#: 336028
Join Date: Oct 2012
Chapter/Region: VIC
Location: Scuurrvey BC
Vehicle:
1995 v2 sti type ra
Glacier White

Default

any recommended plugs? I guess it would help to know what I'm currently running. I'll try and pull one in the next couple days I'll be quite busy though. I tried to contact rob, but alas, hes a busy man.
coupe-a-loop is offline   Reply With Quote
Old 01-30-2013, 07:57 AM   #7
Poppie
Scooby Newbie
 
Member#: 262422
Join Date: Oct 2010
Chapter/Region: International
Location: Dorset,England
Vehicle:
1998 V4 Type R
Feather White

Default

NGK PRF7B is normally used here in the UK.

Perhaps the knock sensor may need checking/replacing?
Poppie is offline   Reply With Quote
Old 01-30-2013, 04:24 PM   #8
AgentJ17
Scooby Newbie
 
Member#: 306411
Join Date: Jan 2012
Chapter/Region: VIC
Location: Duncan, BC
Vehicle:
1995 STi RA
3-cyl conversion...

Default

I'm pretty sure I'm running NGK BKR6E's (one step hotter than 7's) with about a .027" gap on each. Was running about 15.5psi on Rob's 550 tune until I threw a rod... But up until then, I didn't see the CEL blink once.
AgentJ17 is offline   Reply With Quote
Old 01-30-2013, 05:15 PM   #9
coupe-a-loop
Scooby Newbie
 
Member#: 336028
Join Date: Oct 2012
Chapter/Region: VIC
Location: Scuurrvey BC
Vehicle:
1995 v2 sti type ra
Glacier White

Default

Well for what it costs I will try replacing plugs. How likely is it that the knock sensor is malfunctioning? I really don't wann assume that until all other possibilities are explored.
coupe-a-loop is offline   Reply With Quote
Old 01-30-2013, 05:46 PM   #10
Poppie
Scooby Newbie
 
Member#: 262422
Join Date: Oct 2010
Chapter/Region: International
Location: Dorset,England
Vehicle:
1998 V4 Type R
Feather White

Default

You could always remove the knock sensor and give it a clean as they can suffer corrosion but I can't say how likely it is to be failing sorry.
Poppie is offline   Reply With Quote
Old 02-14-2013, 04:12 PM   #11
JFImport
Scooby Newbie
 
Member#: 284597
Join Date: Jun 2011
Default

Check to make sure nothing is rattling. I had this Same issue until i found out That an exhaust hanger was bust off and was vibrating at higher rpms.
JFImport is offline   Reply With Quote
Old 02-14-2013, 07:03 PM   #12
coupe-a-loop
Scooby Newbie
 
Member#: 336028
Join Date: Oct 2012
Chapter/Region: VIC
Location: Scuurrvey BC
Vehicle:
1995 v2 sti type ra
Glacier White

Default

And that was tripping the knock sensor? Worth looking into for sure.
coupe-a-loop is offline   Reply With Quote
Old 02-15-2013, 01:15 PM   #13
JDMFLCL
Scooby Specialist
 
Member#: 180513
Join Date: May 2008
Chapter/Region: RMIC
Location: Super Eurobeat Vol 193..Denver
Vehicle:
Baby Baby C'mon!
Looka Bomba! 99 JDM GM8

Default

Also check for a rattling uppipe heatshield. Caused false knock readings on my car.
JDMFLCL is offline   Reply With Quote
Old 02-21-2013, 04:26 PM   #14
Smoke
Scooby Guru
 
Member#: 172486
Join Date: Feb 2008
Chapter/Region: NWIC
Location: Cheney, WA
Vehicle:
95 V4 STi-RA swap
Stage 49.8

Default

What could cause the CEL blinking? Is that knock? Mine was doing that the other day. I don't think I heard any detonation because my exhaust is pretty loud and my friend's EWG was going off next to me.
Smoke is offline   Reply With Quote
Old 02-21-2013, 08:25 PM   #15
jaxscuby
Sammo Hung
Moderator
 
Member#: 10613
Join Date: Sep 2001
Chapter/Region: South East
Location: F L O R I D A
Vehicle:
2002 USDM WRX
WRB

Default

mis-fire can cause blinking cel..

please check your plugs..color and gap
jaxscuby is offline   Reply With Quote
Old 02-21-2013, 11:13 PM   #16
coupe-a-loop
Scooby Newbie
 
Member#: 336028
Join Date: Oct 2012
Chapter/Region: VIC
Location: Scuurrvey BC
Vehicle:
1995 v2 sti type ra
Glacier White

Default

Ya I think plugs is where I will start. Is it more common to have misfires under high boost? Because thats really the only time I get it. I did howver notice the other day I had no time to warm the car up properly like I always do and I did get a couple quick bleeps within the first 15 seconds of driving. Saw none after it warmed up.
coupe-a-loop 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 09:44 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.