Welcome to the North American Subaru Impreza Owners Club Wednesday September 30, 2020
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L 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.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 03-16-2016, 07:46 PM   #26
PrinceVegeta
Scooby Newbie
 
Member#: 428946
Join Date: Aug 2015
Vehicle:
2008 JDM WRX

Default

Quote:
Originally Posted by sleepymaniac12 View Post
Perform a proper leak down test and let us know the results. That will tell you for sure.

https://mobiloil.com/en/article/car-...-leakdown-test

How many miles are on the car? How many miles at turbo swap? Also, who tuned it, and how long after build?

I bet it was the turbo swap on a car that has too many miles... subaru's don't like more boost unless it has a built bottom end. Part of that is because of new gaskets and seals :-P
Thanks!

I'll see if I can get my mechanic to do a leakdown test.

I did my timing belt at around 85000km mileage, about 53,000miles.

My car now is about 86,000km mileage.

Along with the timing belt change, I did the other stuff, turbo change.. etc as mentioned above.

My tuner uses open source and right after the build, during the road tuning, after 3 or 4 pulls, the coolant started to overflow and explode from the overflow tank..

I am using Koyorad Aluminium Radiator..

http://i.imgur.com/qQtVuNv.jpg

Halp
* Registered users of the site do not see these ads.
PrinceVegeta is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 03-16-2016, 08:19 PM   #27
No Go
Scooby Newbie
 
Member#: 38928
Join Date: Jun 2003
Location: Florida
Vehicle:
2004 153 MPH STI
Silver

Default

"during the road tuning, after 3 or 4 pulls, the coolant started to overflow and explode from the overflow tank.."

Hmmm.

Certainly do a leakdown before pulling the engine...
No Go is offline   Reply With Quote
Old 03-17-2016, 02:50 PM   #28
sleepymaniac12
Scooby Newbie
 
Member#: 420043
Join Date: Apr 2015
Location: Rhode Island
Vehicle:
2013 STi

Default

yea, shouldn't be much of a surprise then... the good news is that gaskets are a cheap fix :-P
sleepymaniac12 is offline   Reply With Quote
Old 06-24-2020, 07:15 PM   #29
TurboQueef
NASIOC Supporter
 
Member#: 86700
Join Date: May 2005
Location: Otsego, MI
Vehicle:
2005 STI
Silver/Black,[email protected]

Default

Roll into 2020...

I am having same issue... under very high load pull (35psi at hit to 28 at redline) it pushes coolant a little coolant out of overflow and bubbles a lot. It seem the higher the timing at the hit to more it pushes. On the other hand, the more timing I give it the more power it makes.

Engine never overheats, during a pull with full on bubbles, temp actually lowers to 185F and stays there full pull.

I have performed several "block tests" which can detect combustion gasses in the coolant.. all came back negative (test performed (sucked) at the overflow tank when heavy bubbling was occurring)

Leak down is within spec and zero bubbles during the test

Boost leak holds 20psi for an hour with no bubbles showing up in coolant

I have clamped all coolant overflow/return lines

I have burped the system several times, after a pull with bubbles, the thing burps a lot..

Oil sample shows zero coolant inside

Making 556/529 at the wheels at 35psi ~ 28psi
E80 fuel, timing curve 17 at hit, 26 at redline
Outfront closed deck, 1/2" head studs, JE head gaskets.
Koyo radiator, new rad caps.
Gates water pump
APS DR725 FMIC with the overflow container that came with it

Fewer bubbles when I run timing of 14 ~ 26 but WHP/TQ drops to 430/443

Any ideas?

Thanks

Jeff
TurboQueef is offline   Reply With Quote
Old 06-24-2020, 10:43 PM   #30
08SpecB_DE
Scooby Newbie
 
Member#: 470981
Join Date: Jul 2017
Chapter/Region: Tri-State
Location: Delaware
Vehicle:
2008 Legacy GT spec
DGM

Default

Have you tried the headgasket test from the turbo coolant tank? Definitely has the symptoms of a blown headgasket.
08SpecB_DE is offline   Reply With Quote
Old 06-25-2020, 07:38 AM   #31
TurboQueef
NASIOC Supporter
 
Member#: 86700
Join Date: May 2005
Location: Otsego, MI
Vehicle:
2005 STI
Silver/Black,[email protected]

Default

Quote:
Originally Posted by 08SpecB_DE View Post
Have you tried the headgasket test from the turbo coolant tank? Definitely has the symptoms of a blown headgasket.

No I have not, thought if overflow is bubbling as I test that would catch the gas if it is present ! Maybe next time will check from that point!
TurboQueef is offline   Reply With Quote
Old 07-19-2020, 02:21 AM   #32
Philramsey00
Scooby Newbie
 
Member#: 507549
Join Date: Oct 2019
Default

Just get a block tester kit , very cheap, basically blue fluid in a suction tube .. you put it on the radiator while running and suck in air from radiator , if there’s and combustion gasses aka carbon dioxide , the fluid turns yellow meaning you have a head gasket issue
Philramsey00 is offline   Reply With Quote
Old 07-27-2020, 08:24 AM   #33
defiant_supra
Scooby Newbie
 
Member#: 377543
Join Date: Jan 2014
Chapter/Region: South East
Location: Columbia
Vehicle:
2014 sti
Grey

Default

@turboqueef I'm having similar issues, I have used a block tester with the blue dye on the upper reservoir and the overflow tank(while it was bubbling) neither have made the fluid change colors. I've used the test strips also and that is not showing any failures either. We have burped the system multiple times, changed the thermostat and both of the radiator caps. The only thing I can think of is hg failure where it is sucking outside air into one of the coolant passages under deceleration but not letting coolant actually leak out. Unless anybody here has some other ideas.
defiant_supra is offline   Reply With Quote
Old 07-27-2020, 08:26 AM   #34
defiant_supra
Scooby Newbie
 
Member#: 377543
Join Date: Jan 2014
Chapter/Region: South East
Location: Columbia
Vehicle:
2014 sti
Grey

Default

Quote:
Originally Posted by Philramsey00 View Post
Just get a block tester kit , very cheap, basically blue fluid in a suction tube .. you put it on the radiator while running and suck in air from radiator , if there’s and combustion gasses aka carbon dioxide , the fluid turns yellow meaning you have a head gasket issue
I have tried this on the radiator and it literally pushes coolant into the tube with the dye.
defiant_supra is offline   Reply With Quote
Old 09-13-2020, 04:20 PM   #35
TurboQueef
NASIOC Supporter
 
Member#: 86700
Join Date: May 2005
Location: Otsego, MI
Vehicle:
2005 STI
Silver/Black,[email protected]

Default

Quote:
Originally Posted by TurboQueef View Post
Roll into 2020...

I am having same issue... under very high load pull (35psi at hit to 28 at redline) it pushes coolant a little coolant out of overflow and bubbles a lot. It seem the higher the timing at the hit to more it pushes. On the other hand, the more timing I give it the more power it makes.

Engine never overheats, during a pull with full on bubbles, temp actually lowers to 185F and stays there full pull.

I have performed several "block tests" which can detect combustion gasses in the coolant.. all came back negative (test performed (sucked) at the overflow tank when heavy bubbling was occurring)

Leak down is within spec and zero bubbles during the test

Boost leak holds 20psi for an hour with no bubbles showing up in coolant

I have clamped all coolant overflow/return lines

I have burped the system several times, after a pull with bubbles, the thing burps a lot..

Oil sample shows zero coolant inside

Making 556/529 at the wheels at 35psi ~ 28psi
E80 fuel, timing curve 17 at hit, 26 at redline
Outfront closed deck, 1/2" head studs, JE head gaskets.
Koyo radiator, new rad caps.
Gates water pump
APS DR725 FMIC with the overflow container that came with it

Fewer bubbles when I run timing of 14 ~ 26 but WHP/TQ drops to 430/443

Any ideas?

Thanks

Jeff

FYI.. My issue was a blowing head gasket... it finally let loose on the way to work last month... the combustion gasses that made their way into the coolant system created two big caverns in the Outfront closed deck case.. My cause was a too agressive timing curve (my fault)... FYI
TurboQueef is offline   Reply With Quote
Old 09-13-2020, 04:46 PM   #36
subaru_gc8
Scooby Specialist
 
Member#: 29292
Join Date: Nov 2002
Chapter/Region: SCIC
Location: Orange County CA
Vehicle:
2004 WRX wagon
silver

Default

Quote:
Originally Posted by PrinceVegeta View Post
Thanks!

I'll see if I can get my mechanic to do a leakdown test.

I did my timing belt at around 85000km mileage, about 53,000miles.

My car now is about 86,000km mileage.

Along with the timing belt change, I did the other stuff, turbo change.. etc as mentioned above.

My tuner uses open source and right after the build, during the road tuning, after 3 or 4 pulls, the coolant started to overflow and explode from the overflow tank..

I am using Koyorad Aluminium Radiator..

http://i.imgur.com/qQtVuNv.jpg

Halp
uhh chances are if it is explioding out of the overflow its a headgasket. I would skip the leakdown and do a block test
subaru_gc8 is offline   Reply With Quote
Old 09-13-2020, 05:22 PM   #37
TurboQueef
NASIOC Supporter
 
Member#: 86700
Join Date: May 2005
Location: Otsego, MI
Vehicle:
2005 STI
Silver/Black,[email protected]

Default

Quote:
Originally Posted by subaru_gc8 View Post
uhh chances are if it is explioding out of the overflow its a headgasket. I would skip the leakdown and do a block test

When mine went from bubbles to full tilt failure.. it ripped a slit down the upper radiator hose, vomited all coolant out within seconds. As it happened, I suddenly thought ... how did I dip the bow into water like that.... it was like a small tsunami erupting from the slit between hood and left fender.

Upon tow-age to my home and landing the STi in it's garage space I tried to perform a leak down test .. could not get any compression in the violated cylinder... here is why:







TurboQueef 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
Fs Va: Oem Washer Tank, Oem Coolant Overflow Tank Bugeyeballa Engine/Power/Exhaust 2 10-25-2009 08:33 PM
Rough idle and oily residue in coolant overflow tank Kansai Subaru Service & Maintenance 15 05-25-2008 12:12 AM
If you saw this in your coolant overflow tank... WRXedUSA Off-Topic 39 11-21-2005 10:10 AM
What is this goo in my coolant overflow tank? yobtah Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 1 05-28-2005 03:27 PM
Coolant Overflow Tanks Roo Service & Maintenance 4 05-07-2002 12:06 PM

All times are GMT -4. The time now is 04:55 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2020 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.