Welcome to the North American Subaru Impreza Owners Club Saturday September 20, 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 2.0L 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 02-23-2006, 04:55 PM   #1
yellowmustang94
Scooby Newbie
 
Member#: 92189
Join Date: Jul 2005
Default How to modify the wastegate spring?

Anyone know the best way to modify the wastegate spring to LOWER the boost? I am putting a turbo off of my friend's WRX that we parted out onto another friend's S10 4-cylinder, but we only want to run around 5-6 psi if we can. I might just let it run the way it is at 7-8 psi, but I don't wanna screw up his truck! Is there anybody who makes a replacement spring for these turbos that would bring the boost down? Thanks!
* Registered users of the site do not see these ads.
yellowmustang94 is offline   Reply With Quote
Old 02-23-2006, 05:03 PM   #2
hondaeater69
Scooby Guru
 
Member#: 60324
Join Date: Apr 2004
Location: a pillow.
Default

what's WG boost on a stock td04? If that's low enough you can just loosen the C clip or run a hose stright from the compressor to the WG.

If it's not low enough just get a cheap MBC and turn it down.
hondaeater69 is offline   Reply With Quote
Old 02-23-2006, 05:08 PM   #3
yellowmustang94
Scooby Newbie
 
Member#: 92189
Join Date: Jul 2005
Default

From what I've read on other posts the stock TD04 WG runs 7-8 psi, which MAY be okay.....So when you say to get a MBC, how can that turn it down? I thought those can only raise the boost over what the WG allows? I'm still learning but that is what I've gathered from what I've read so far. I'm getting a cheapo MBC anyway just in case we want to tune around with the boost!
yellowmustang94 is offline   Reply With Quote
Old 02-23-2006, 05:45 PM   #4
hondaeater69
Scooby Guru
 
Member#: 60324
Join Date: Apr 2004
Location: a pillow.
Default

yea you're right about the mbc. on the stock turbo you can play around with the length of the WG arm, it's adjustable.
hondaeater69 is offline   Reply With Quote
Old 02-23-2006, 05:50 PM   #5
yellowmustang94
Scooby Newbie
 
Member#: 92189
Join Date: Jul 2005
Default

Quote:
Originally Posted by hondaeater69
yea you're right about the mbc. on the stock turbo you can play around with the length of the WG arm, it's adjustable.
I had read about that, but won't that cause problems if I mess with that? Which way do I need to turn it to lower boost? I know if you are adjusting it to raise boost you have a chance of getting boost spike, but are there any problems with adjusting it down? Seems to me like it could cause a problem, but I dunno.....Thanks!
yellowmustang94 is offline   Reply With Quote
Old 02-23-2006, 06:11 PM   #6
hondaeater69
Scooby Guru
 
Member#: 60324
Join Date: Apr 2004
Location: a pillow.
Default

i don't know if it's clockwise or counter, but you'll know which is which when you start to turn it. honestly i'm not entirely sure what kind of results it would produce.

Regarding your original question, there are companies that make aftermarket WG assembelies, but i don't see them having WG tensions of less than 8psi. your only shot at that may be finding a smaller turbo with a weaker WG and swapping it's WG assembely (if that's even possible).
hondaeater69 is offline   Reply With Quote
Old 02-24-2006, 08:32 AM   #7
ride5000
Scooby Guru
 
Member#: 32792
Join Date: Feb 2003
Chapter/Region: NESIC
Location: lincoln, ri
Vehicle:
2003 GGA MBP
12.9 / 105+

Default

simple way to do it:

take a look at the many "helper spring" threads on this website.

just like all those threads, hook the spring on the wastegate flapper arm.

instead of pulling it towards the wastegate actuator, keeping the gate closed tighter, you pull it in the opposite direction (netting the opposite effect).

instant lower wastegate tension.

i would not try extending the wastegate actuator arm length, since this may prevent the wastegate from ever closing completely (ie rattling around).
ride5000 is offline   Reply With Quote
Old 02-24-2006, 04:24 PM   #8
yellowmustang94
Scooby Newbie
 
Member#: 92189
Join Date: Jul 2005
Default

Quote:
Originally Posted by ride5000
simple way to do it:

take a look at the many "helper spring" threads on this website.

just like all those threads, hook the spring on the wastegate flapper arm.

instead of pulling it towards the wastegate actuator, keeping the gate closed tighter, you pull it in the opposite direction (netting the opposite effect).

instant lower wastegate tension.

i would not try extending the wastegate actuator arm length, since this may prevent the wastegate from ever closing completely (ie rattling around).
That was my point about the wastegate not closing....is there a certain limit on how many turns to take the arm down before it starts to not close? I suppose I could just mess with it now since it's off the car and see how far I can go until the wastegate opens, right? I like the helper spring idea, but what do I clamp the spring onto? Thanks!
yellowmustang94 is offline   Reply With Quote
Old 02-24-2006, 05:32 PM   #9
JRsleeper
Scooby Newbie
 
Member#: 94791
Join Date: Aug 2005
Chapter/Region: NESIC
Location: North Branford, CT
Vehicle:
2002 WRX wagon WRB
Ver 8 EJ207 4.44's

Default

One of my buddy just picked up a used late 90's Volvo tdo4-13 turbo for his toyota. He has Alldata at work, so he look up the factory wastegate actuator for Volvo. Alldata stated that his tdo4 volvo turbo has a 1.5 lbs wastegate actuator spring.
JRsleeper 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
How to modify the stock dummy water temp gauge to real water temp gauge? SuperTurbo Normally Aspirated Powertrain 14 02-01-2008 06:38 PM
How to choose your own spring rates (and get the spring frequencies correct) stretchsje Brakes, Steering & Suspension 2 05-16-2007 01:55 PM
how to adjust the turbo wastegate shaneconaway Factory 2.0L Turbo Powertrain 4 06-10-2006 03:12 PM
how to modify 55w fog wiring to handle 100w? subyguy25rs Electrical & Lighting 8 09-20-2004 12:03 PM
('93-'01) How should I begin to modify the RS with $500? jImp Impreza Forum 22 08-08-2001 09:31 AM


All times are GMT -4. The time now is 02:59 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.