Welcome to the North American Subaru Impreza Owners Club Wednesday October 22, 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 (EJ Series Factory 2.0L 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.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 05-07-2005, 11:13 PM   #1
verc
Scooby Specialist
 
Member#: 41754
Join Date: Aug 2003
Location: san ramon
Vehicle:
03 wrx
gt35r, 2.5L, meth

Default How much is an external wastegate going to help?

So right now a vf30 is already on a borderline of how much lag I feel comfortable with, but I've heard that going to an external wastegate can decrease the rpm to reach full boost? I'm wondering, for people that have run a turbo on both internal and external wastegate, how much improvement you got since I was thinking I could go to an external wastegate and 1818F and not have much more lag than I have now. (I'm running the stock boost control w/ no restrictor pill for the vf30 so it's a laggier than a vf30 should be)
* Registered users of the site do not see these ads.
verc is offline   Reply With Quote
Old 05-07-2005, 11:41 PM   #2
Rallycarperson
Scooby Specialist
 
Member#: 53971
Join Date: Jan 2004
Chapter/Region: Tri-State
Location: NJ y0!
Vehicle:
#35 SP Rally Car
MAP-RALLY.com

Default

Never heard of decreased spool with an external wastegate.

However, they do help with boost creep.


-Mark
MAPmotors.com
Rallycarperson is offline   Reply With Quote
Old 05-08-2005, 12:15 AM   #3
311grassroots
Scooby Newbie
 
Member#: 81187
Join Date: Feb 2005
Chapter/Region: Tri-State
Location: IBwhatkindalocationisthat
Default

I too was wondering the benefits of an external wastegate on a smaller IHI turbo, like a VF-39 for instance.
311grassroots is offline   Reply With Quote
Old 05-08-2005, 01:51 AM   #4
InfamousDX
Scooby Guru
 
Member#: 25413
Join Date: Sep 2002
Chapter/Region: Tri-State
Location: North NJ
Default

Like Mark said, if you have boost creep which the 39 is notorious for having, it will help because it no longer uses the 39's internal wastegate to control boost.
InfamousDX is offline   Reply With Quote
Old 05-08-2005, 01:58 AM   #5
RexRexRex
Scooby Specialist
 
Member#: 37389
Join Date: May 2003
Chapter/Region: NWIC
Location: Renton Wa
Vehicle:
2003 gt35r wrx
Built not bought

Default

Hey at least you get a cool sound from the turbo!
RexRexRex is offline   Reply With Quote
Old 05-08-2005, 02:18 AM   #6
ebeck
Scooby Specialist
 
Member#: 35585
Join Date: Apr 2003
Location: Scottsdale AZ.
Vehicle:
RIP I'll always be
The Ver8 Magistrate

Default

On a smaller turbo probably not much. You really have to be pushing alot of air and the WRX heads are the big factor. The 2.0 just does not make power. Look at the reams of T67's and GT35's all suck below 320whp on pump gas. Those have external wastegates. Same stick point as with an Internal Green.

I'd skip it and put in brakes.
ebeck is offline   Reply With Quote
Old 05-08-2005, 02:55 AM   #7
verc
Scooby Specialist
 
Member#: 41754
Join Date: Aug 2003
Location: san ramon
Vehicle:
03 wrx
gt35r, 2.5L, meth

Default

ah, ok thanks. Guess I just misinterpreted some info.

well it would be really cheap to do since I would do my own fabbing, I don't think the actual wastegate is that much right?
verc is offline   Reply With Quote
Old 05-08-2005, 05:17 AM   #8
rubyred
Scooby Newbie
 
Member#: 70414
Join Date: Sep 2004
Default

about 200 new for a tial 38mm
rubyred is offline   Reply With Quote
Old 05-08-2005, 09:38 AM   #9
tmarcel
Scooby Specialist
 
Member#: 7555
Join Date: Jun 2001
Chapter/Region: South East
Location: Charlotte NC
Default

It'll be even more helpful on a small turbo (hotside) like the VF you're running. Running a small hotside is good for quick spool BUT hinders it's power output as rpms build into the upper end. By throughing on an external gate you'll realize gains by uncorking the exhaust manifold, thus helping the VE of the engine. And yes, it will also allow better control of boost as a bonus. Does this mean that an external gate is ALWAYS better? Not neccessarily as there are high dollar race cars that use turbos with internal gates so it just depends what the design is intended for and how it's designed
tmarcel 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 much is a valve job going to run me? undefeated978 Service & Maintenance 5 05-13-2008 09:15 PM
how much is an sti pitch rod worth? White 2.5rs Normally Aspirated Powertrain 2 10-08-2003 08:17 PM
how much is an inspection ticket in NJ? RidinLow Tri-State Area Forum 12 08-07-2003 04:37 PM
How much is it the sti going to be? ark101 News & Rumors 18 10-17-2001 12:19 PM
How much is an Impreza worth? Snoopy General Forum Archive 36 06-06-2000 06:04 PM


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