Welcome to the North American Subaru Impreza Owners Club Friday December 19, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
Mid Atlantic Impreza Club
Mid Atlantic Impreza Club Forum sponsored by Annapolis Subaru
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 Chapters > Mid Atlantic Impreza Club -- MAIC

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 09-03-2011, 12:09 AM   #1
apache
Scooby Newbie
 
Member#: 160799
Join Date: Oct 2007
Chapter/Region: MAIC
Location: Virgina Beach, VA
Vehicle:
O2 WRX
WRB

Thumbs down Late-Spool Issue. Advice? Assistance?

My car is a 100% stock '02 wrx sedan.

I'm hitting target boost, but it's not coming on until around 4K rpm.
This issue has come up within the last week and a half or so. Prior to that, I was getting full boost at just over 3k in third, and whatever the target boost is in 1st and 2nd. In short, it was running great and making proper boost at all times.
The issues seemed to pop up out of the blue. I drove home from work, parked the car for about two hours, and when I took it back out it felt boggy.

The only thing I've done to the car in the last few months is change the gear oil to Redline Heavyweight Shockproof.

I smoke tested it today and found a pretty decent post-MAF air leak, which I fixed. This had no effect on the boost problem. I have not checked it for a boost leak yet.
I tried removing the vac line from the wastegate actuator to eliminate the boost control system as a possible cause. With that hose removed, the boost would spike to well above target if I let it, but still would not get there before 4k rpm.

I haven't thoroughly checked it for exhaust leaks, but I got a good look at the exhaust manifold tonight and didn't see any signs of a leak.
I've had the car for a few months and have never removed the turbo, uppipe or manifold myself. Whether or not they were moved before I got the car I have no idea. The exhaust sound hasn't changed at all.

Anyone have any experience with this problem, or wanna help me figure it out??
* Registered users of the site do not see these ads.
apache is offline   Reply With Quote
Old 09-03-2011, 12:52 AM   #2
Tut4u2
Scooby Specialist
 
Member#: 40424
Join Date: Jul 2003
Chapter/Region: MAIC
Location: Syracuse, NY
Vehicle:
05 STi

Default

Tired turbo? wastegate?
Tut4u2 is online now   Reply With Quote
Old 09-03-2011, 01:35 AM   #3
apache
Scooby Newbie
 
Member#: 160799
Join Date: Oct 2007
Chapter/Region: MAIC
Location: Virgina Beach, VA
Vehicle:
O2 WRX
WRB

Default

Quote:
Originally Posted by Tut4u2 View Post
Tired turbo? wastegate?
Both of those came to mind.
I'm not getting any smoke from the turbo at all. How would I verify that, other than by checking for shaft play? Spin the wheel and see if it drags?

The wastegate actuator I can test with a vacuum pump...
apache is offline   Reply With Quote
Old 09-04-2011, 01:42 AM   #4
apache
Scooby Newbie
 
Member#: 160799
Join Date: Oct 2007
Chapter/Region: MAIC
Location: Virgina Beach, VA
Vehicle:
O2 WRX
WRB

Default

anyone?
apache is offline   Reply With Quote
Old 09-04-2011, 08:40 AM   #5
Abnormal
Douchebag Moderator
Moderator
 
Member#: 149626
Join Date: May 2007
Chapter/Region: MAIC
Location: zip22182
Vehicle:
2005 CGM FXT
Rocket Box! :D

Default

Check the actuator (and if you bypassed the BCS and got spiking... you did not bypass correctly).

Pre-turbo exhaust leak would be my guess - or a HUGE block in your post-turbo exhaust.


There are assuming your post-MAF leak is fixed now.
Abnormal is offline   Reply With Quote
Old 09-05-2011, 12:41 AM   #6
apache
Scooby Newbie
 
Member#: 160799
Join Date: Oct 2007
Chapter/Region: MAIC
Location: Virgina Beach, VA
Vehicle:
O2 WRX
WRB

Default

Quote:
Originally Posted by Abnormal View Post
Check the actuator (and if you bypassed the BCS and got spiking... you did not bypass correctly).

Pre-turbo exhaust leak would be my guess - or a HUGE block in your post-turbo exhaust.


There are assuming your post-MAF leak is fixed now.
How do I check the actuator? I disconnected the arm from the wastegate and moved it around to make sure it wasn't sticking. It seemed to move freely enough. I haven't checked the diaphram for a leak yet.

I bypassed the BCS by removing the hose from the actuator. This does in fact bypass the BCS, does it not, since it would then have no affect on boost control? I still don't fully understand this clusterf**k boost control system...

I don't hear any major exhaust leaks, but I haven't checked it all that carefully. I still have both of the stock cats, so I wouldn't be surprised if one or both of them were clogged.
apache is offline   Reply With Quote
Old 09-05-2011, 04:31 PM   #7
Unabomber
Big Ron
Moderator
 
Member#: 18062
Join Date: Apr 2002
Chapter/Region: MAIC
Location: I can save you a ton of cash
Vehicle:
on car parts so PM
me b4 j00 buy

Default

If you don't find a pre-turbo vacuum leak in the vacuum lines, the thought that comes to my mind is your stock uppipe is clogged. I would REALLY recommend you take it to Kienan at All Aspects on Tilden St in Chesapeake.
Unabomber is offline   Reply With Quote
Old 09-05-2011, 04:44 PM   #8
Steve.804
Scooby Specialist
 
Member#: 68647
Join Date: Aug 2004
Chapter/Region: MAIC
Location: Richmond, VA
Vehicle:
07 STI
Rotated 35R Jorge Tuned

Default

How many miles on the turbo and car? How are you monitoring boost? Does it hold any less to redline? Any abnormal noises heard? You can be looking at anything from a (upipe) gasket issue to a blown turbo. Tough one to diag over the internet!
Steve.804 is offline   Reply With Quote
Old 09-05-2011, 06:25 PM   #9
kuntryquest
Scooby Newbie
 
Member#: 278027
Join Date: Mar 2011
Vehicle:
2005 Legacy GT
Pearl

Default

Is it fading off at all once you hit peak boost? Heck I would check all your vac hoses. Also check your post turbo exhaust. Other than that I would point to the turbo.
kuntryquest is offline   Reply With Quote
Old 09-05-2011, 06:43 PM   #10
Abnormal
Douchebag Moderator
Moderator
 
Member#: 149626
Join Date: May 2007
Chapter/Region: MAIC
Location: zip22182
Vehicle:
2005 CGM FXT
Rocket Box! :D

Default

Quote:
Originally Posted by apache View Post
How do I check the actuator? I disconnected the arm from the wastegate and moved it around to make sure it wasn't sticking. It seemed to move freely enough. I haven't checked the diaphram for a leak yet.

I bypassed the BCS by removing the hose from the actuator. This does in fact bypass the BCS, does it not, since it would then have no affect on boost control? I still don't fully understand this clusterf**k boost control system...

I don't hear any major exhaust leaks, but I haven't checked it all that carefully. I still have both of the stock cats, so I wouldn't be surprised if one or both of them were clogged.
That would be exactly how not to bypass it Just disabling it...

Put a hose on the compressor nipple, then attach the other end to the actuator. That's it. Direct vacuum connection. EBCS is now bypassed.
Abnormal is offline   Reply With Quote
Old 09-05-2011, 09:15 PM   #11
Louie
Scooby Guru
 
Member#: 43393
Join Date: Sep 2003
Chapter/Region: MAIC
Location: Middle River
Vehicle:
2014 Audi a6
Daytona Gray

Default

Question for the gurus...

Would the pre-turbo cat breaking down or oem egt probe cause said problem?
Louie is offline   Reply With Quote
Old 09-05-2011, 10:53 PM   #12
Abnormal
Douchebag Moderator
Moderator
 
Member#: 149626
Join Date: May 2007
Chapter/Region: MAIC
Location: zip22182
Vehicle:
2005 CGM FXT
Rocket Box! :D

Default

The cat busting and clogging the flow of exhaust would certainly cause an issue for a turbo - which is spooled by the flow of exhaust gases through said pipe.

The EGT, unlikely. Cat's a much more likely candidate.

psirst (Elmer) had a similar issue - Glowing red uppipe is a good sign it's clogged


EDIT:

This is why I usually recommend an uppipe be the first mod for anyone with a catted uppipe!
Abnormal is offline   Reply With Quote
Old 09-06-2011, 08:57 PM   #13
apache
Scooby Newbie
 
Member#: 160799
Join Date: Oct 2007
Chapter/Region: MAIC
Location: Virgina Beach, VA
Vehicle:
O2 WRX
WRB

Default

UPDATE:

My uppipe is leaking. I smoke-checked the exhaust and found a leak in the uppipe, somewhere behind the heatshield where I can't see it. I can see that it's not the gasket but the uppipe itself, somehow. I think maybe my blown-to-s**t engine mounts may have had something to do with it...possibly a crack in the weld. Either way, the uppipe has to go. I noticed the other day that the lag is substantially worse when the car is cold, and not nearly as bad when warm. This could have meant a lot of things, but the easiest to check was the exhaust.
I'll update this when I know for sure that it's fixed. Thanks for the advice.


edit:
To answer some of your questions...
-The car has 84,xxx miles on it.
-I'm monitoring boost with the factory boost gauge.
-Once it finally reaches target boost, it holds until it gets close to redline and then tapers off. Seems normal, minus the late spool.
-No abnormal noises or smoke.

Last edited by apache; 09-06-2011 at 09:04 PM.
apache is offline   Reply With Quote
Old 09-21-2011, 08:25 PM   #14
apache
Scooby Newbie
 
Member#: 160799
Join Date: Oct 2007
Chapter/Region: MAIC
Location: Virgina Beach, VA
Vehicle:
O2 WRX
WRB

Default

Update:
I replaced the stock uppipe with a new catless one, problem is fixed.
With the catless uppipe and stock exhaust I got full boost by ~3400 in 3rd, 4th & 5th. After gutting the stock downpipe, I get full boost by ~3100 in 3rd, 4th & 5th.
apache 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
Need some possible Legal Advice/assistance SwiftShifter87 North West Impreza Club Forum -- NWIC 8 09-22-2009 12:08 AM
Ticking noise / Starting issue... advice please. 93 Impreza SubyZ Normally Aspirated Powertrain 0 06-26-2007 09:17 PM
Major paypal issues. Advice please? Overlord2kx Off-Topic 13 02-28-2007 11:09 PM
Possible Wheel Bearing issue...advice / recommendations needed GonzoWRX Mid Atlantic Impreza Club -- MAIC 12 10-26-2006 12:45 PM


All times are GMT -4. The time now is 12:45 AM.


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.