Welcome to the North American Subaru Impreza Owners Club Friday April 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 > Factory 2.5L 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 01-09-2013, 08:27 PM   #1
05_wRex
Scooby Specialist
 
Member#: 170097
Join Date: Jan 2008
Chapter/Region: South East
Location: Chattanooga, TN
Vehicle:
2007 WRX STi PTE6266
OBP

Default

Edit: found the problem. The hose barbs were on backwards. One has a tiny bleed hole. It was on the wrong port.

I bought a hallman pro rx boost controller and the boost curve was really ugly. 20 psi initial, dropping to 18 psi and coming back up to a target of 23 psi for the last 1500 rpm. really annoying. We couldnt get it to work right, so I ended up putting the 3-port back on the car and completely re-did the boost map and all comp tables. It works like it did before except I get a small spike and then rock solid boost to redline.

My setup is a pte 6266 with tial mvs 44mm wastegate dumped to atmosphere. (Intake manifold port - Hallman - bottom port on waste gate. Top port vented to atmosphere.) Would you suggest running the pressure line to the hallman from the nipple on the turbo compressor housing or from the intake manifold after the throttle body? I ask because all the diagrams for manual boost controllers show it connected to the nipple on the compressor housing. My 3-port was hooked up to the intake manifold nipple so I used the same place for the hallman.

The boost was identical with the light spring and the heavy spring. Its a simple MBC and shouldn't have any issues. Has anyone had a problem like this? Or have any suggestions?

Thanks
* Registered users of the site do not see these ads.

Last edited by 05_wRex; 01-11-2013 at 08:45 PM.
05_wRex is offline   Reply With Quote
Old 01-10-2013, 09:10 AM   #2
05_wRex
Scooby Specialist
 
Member#: 170097
Join Date: Jan 2008
Chapter/Region: South East
Location: Chattanooga, TN
Vehicle:
2007 WRX STi PTE6266
OBP

Default

Bump. I'd rather run the hallman over the 3-port. The 3-port is super touchy. If anyone wants to look at my logs while dialing in boost and can suggest a fix for the spike from the 3-port, I would use it instead. thanks for any help.
05_wRex is offline   Reply With Quote
Old 01-10-2013, 10:40 AM   #3
Joshz400_03
Scooby Specialist
 
Member#: 198844
Join Date: Dec 2008
Chapter/Region: MWSOC
Location: Green Bay, WI
Vehicle:
2004 WRB STi

Default

Are you setting it up as a hybrid setup or just a MBC?
Joshz400_03 is online now   Reply With Quote
Old 01-10-2013, 10:53 AM   #4
05_wRex
Scooby Specialist
 
Member#: 170097
Join Date: Jan 2008
Chapter/Region: South East
Location: Chattanooga, TN
Vehicle:
2007 WRX STi PTE6266
OBP

Default

Just one or the other. Haha. If I can get rid of the spike from the 3-port, I'll use it. Or if I can get the hallman to work correctly, I'll use it. I have the in cabin adjustment for the hallman.


For the 3-port, is there a derivative setting in the series 2 aem ems? If not, I'm guessing I need to get P and I set a little better.

Thanks
05_wRex is offline   Reply With Quote
Old 01-10-2013, 11:11 AM   #5
Leafy
Scooby Specialist
 
Member#: 330625
Join Date: Aug 2012
Chapter/Region: NESIC
Location: MA
Vehicle:
2006 WRX
WRB

Default

MBC MUST pick up from before the throttle body. But you want it to be after the intercooler so that you dont get boost sag. EBC should just pull signal from the compressor housing in the name of keeping the lines short, but it can pull from anywhere.
Leafy is offline   Reply With Quote
Old 01-10-2013, 11:35 AM   #6
xluben
Scooby Guru
 
Member#: 261612
Join Date: Oct 2010
Location: Minneapolis, MN
Vehicle:
2012 Forester 2.5X
2002 WRX Sedan

Default

As mentioned above, you need to use the nipple on the compressor or make one in your FMIC piping (pre-throttle body). Using the one on the compressor is easy and works just as well.
xluben is offline   Reply With Quote
Old 01-10-2013, 11:51 AM   #7
05_wRex
Scooby Specialist
 
Member#: 170097
Join Date: Jan 2008
Chapter/Region: South East
Location: Chattanooga, TN
Vehicle:
2007 WRX STi PTE6266
OBP

Default

Great! Thanks for the responses guys. I'll give all that a shot.

Can I tap off of the bov? It is right before the throttle body on my setup. The boost gauge is tapped there also.

This was all setup when I bought the car, so I figured it was right. Haha.
05_wRex is offline   Reply With Quote
Old 01-10-2013, 11:53 AM   #8
Leafy
Scooby Specialist
 
Member#: 330625
Join Date: Aug 2012
Chapter/Region: NESIC
Location: MA
Vehicle:
2006 WRX
WRB

Default

The bov signal source is supposed to be behind the throttle body.
Leafy is offline   Reply With Quote
Old 01-10-2013, 12:02 PM   #9
05_wRex
Scooby Specialist
 
Member#: 170097
Join Date: Jan 2008
Chapter/Region: South East
Location: Chattanooga, TN
Vehicle:
2007 WRX STi PTE6266
OBP

Default

Oh ya. Sorry. Brain fart. It is. I was only thinking its location, not signal location.
05_wRex is offline   Reply With Quote
Old 01-10-2013, 02:54 PM   #10
05_wRex
Scooby Specialist
 
Member#: 170097
Join Date: Jan 2008
Chapter/Region: South East
Location: Chattanooga, TN
Vehicle:
2007 WRX STi PTE6266
OBP

Default

OK. So, pre-throttle body pressure source didn't change the ebc much. It's still annoying. I can have 21 psi or I can have 20-25 psi fluctuating.

The hallman got a little better. Its hitting 21 then 20 then still climbing in the upper rpm to 24. This curve will still ruin the peak torque area.

Suggestions? Setting the hallman to less than 18-19 psi gives me rock solid boost from spool to redline. Its not until I adjust it to make more boost that it will look like @$$.
05_wRex is offline   Reply With Quote
Old 01-10-2013, 02:58 PM   #11
Leafy
Scooby Specialist
 
Member#: 330625
Join Date: Aug 2012
Chapter/Region: NESIC
Location: MA
Vehicle:
2006 WRX
WRB

Default

I would put the ebc in and tune it the way you want it. It sounds like you need to tune in the wgdc tables a bit more and make some adjustments to the turbo dynamics.
Leafy is offline   Reply With Quote
Old 01-10-2013, 03:21 PM   #12
05_wRex
Scooby Specialist
 
Member#: 170097
Join Date: Jan 2008
Chapter/Region: South East
Location: Chattanooga, TN
Vehicle:
2007 WRX STi PTE6266
OBP

Default

Quote:
Originally Posted by Leafy View Post
I would put the ebc in and tune it the way you want it. It sounds like you need to tune in the wgdc tables a bit more and make some adjustments to the turbo dynamics.
Ya. Seems the easiest...albeit the most frustrating. Haha.

So are my numbers typical for a hallman pro RX? I thought it was supposed to be the best and give you rock solid boost with no spikes and all that crap. Haha.
05_wRex is offline   Reply With Quote
Old 01-10-2013, 03:25 PM   #13
05_wRex
Scooby Specialist
 
Member#: 170097
Join Date: Jan 2008
Chapter/Region: South East
Location: Chattanooga, TN
Vehicle:
2007 WRX STi PTE6266
OBP

Default

How hard would it be to setup a hybrid system? Seeing as how I already have both installed. (Just changing vacuum lines to switch.)
05_wRex is offline   Reply With Quote
Old 01-10-2013, 04:12 PM   #14
xluben
Scooby Guru
 
Member#: 261612
Join Date: Oct 2010
Location: Minneapolis, MN
Vehicle:
2012 Forester 2.5X
2002 WRX Sedan

Default

A hybrid system will still use the MBC exclusively at WOT, so you'll see the same issues.

What spring do you have in the EWG? It may be too light.
xluben is offline   Reply With Quote
Old 01-10-2013, 04:22 PM   #15
05_wRex
Scooby Specialist
 
Member#: 170097
Join Date: Jan 2008
Chapter/Region: South East
Location: Chattanooga, TN
Vehicle:
2007 WRX STi PTE6266
OBP

Default

Quote:
Originally Posted by xluben View Post
A hybrid system will still use the MBC exclusively at WOT, so you'll see the same issues.

What spring do you have in the EWG? It may be too light.
1 bar.
05_wRex is offline   Reply With Quote
Old 01-10-2013, 05:17 PM   #16
05_wRex
Scooby Specialist
 
Member#: 170097
Join Date: Jan 2008
Chapter/Region: South East
Location: Chattanooga, TN
Vehicle:
2007 WRX STi PTE6266
OBP

Default

I may try to use the top port on the waste gate and use the hallman backwards. Not really backwards. Fully closed clockwise would shut off the signal to the top of the waste gate producing 14.7 psi or so. And then opening it up would turn the boost up. Let me know if this is stupid. It might help...or it will look exactly the same as before. Haha.
05_wRex is offline   Reply With Quote
Old 01-10-2013, 06:00 PM   #17
Quiksmith
Scooby Newbie
 
Member#: 266230
Join Date: Dec 2010
Chapter/Region: NWIC
Location: Pasco, WA
Vehicle:
2006 WRX STI
Aspen White

Default

Your MBC should be rock solid. Wonder what is happening, did you check all your hoses for leaks? Do you have an internal WG + EWG? Do you have any measures to keep the internal from opening? Just initial thoughts I had...I might try to think of some other issues as well.
Quiksmith is offline   Reply With Quote
Old 01-10-2013, 06:07 PM   #18
05_wRex
Scooby Specialist
 
Member#: 170097
Join Date: Jan 2008
Chapter/Region: South East
Location: Chattanooga, TN
Vehicle:
2007 WRX STi PTE6266
OBP

Default

Quote:
Originally Posted by Quiksmith View Post
Your MBC should be rock solid. Wonder what is happening, did you check all your hoses for leaks? Do you have an internal WG + EWG? Do you have any measures to keep the internal from opening? Just initial thoughts I had...I might try to think of some other issues as well.
No internal gate. Just the tial 44 mm dumped to atmosphere. No lines have some off or anything. I will pressure test the system in a little while.
05_wRex is offline   Reply With Quote
Old 01-10-2013, 06:57 PM   #19
05_wRex
Scooby Specialist
 
Member#: 170097
Join Date: Jan 2008
Chapter/Region: South East
Location: Chattanooga, TN
Vehicle:
2007 WRX STi PTE6266
OBP

Default

Also, I may have found the issue. Sadly I am an idiot if this fixes it. One of the hose barbs has a small hole in it that is supposed to stay on the output of the MBC. I apparently switched them around and the barb with the tiny hole was on the input side of the controller.
05_wRex is offline   Reply With Quote
Old 01-10-2013, 07:08 PM   #20
novacivic
Scooby Specialist
 
Member#: 117980
Join Date: Jun 2006
Chapter/Region: NESIC
Location: Rochester, NH
Vehicle:
2005 sti
wr blue

Default

What spring are you running in the wastegate?
novacivic is offline   Reply With Quote
Old 01-10-2013, 07:11 PM   #21
05_wRex
Scooby Specialist
 
Member#: 170097
Join Date: Jan 2008
Chapter/Region: South East
Location: Chattanooga, TN
Vehicle:
2007 WRX STi PTE6266
OBP

Default

Quote:
Originally Posted by novacivic View Post
What spring are you running in the wastegate?
1 bar.
05_wRex 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 01:55 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.