Welcome to the North American Subaru Impreza Owners Club Thursday September 18, 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 11-04-2010, 12:11 PM   #426
scoobystas
Scooby Specialist
 
Member#: 26568
Join Date: Oct 2002
Chapter/Region: NESIC
Location: Brighton, Mass
Vehicle:
2003 Yellow Bugeye
Version 8-Vf37

Default

Quote:
Originally Posted by DigitalPunk View Post
my gas mileage with a regular vf37 is horrific! close to 10/g. anyone else having this issue? i wonder if the blouch will increase it. even if by a margin
i avg about 20mpg w/ej207 and usdm 5spd. You should be 17-18mpg w/TS and 2.5L.

Is it possible that your tune is setup to clear your CL delays and enter open loop at very low throttle inputs like 20-25%. I looked at my stock usdm 03' rom and its setup to enter open loop at 4K and 69.8% throttle input amongst other things like @78mph, while my current rom clears all delays and enters open loop at 3K, about 23% throttle, 32mph, there are alot of different variables in the OL/CL transition table that will cause you to enter the "richer" a/f targets.
Its just a possibility i guess.

btw, my delay is zeroed so there is no real "delay" once over those limiting figures, its just enters open loop, so check your A/F primary target table and make sure you like the A/F that is being targeted during cruising around. Basically it should target around stoich up to about 1 g/rev of load.
* Registered users of the site do not see these ads.
scoobystas is offline   Reply With Quote
Old 11-04-2010, 12:38 PM   #427
jnorth85
NASIOC Supporter
 
Member#: 76785
Join Date: Dec 2004
Chapter/Region: MWSOC
Location: DSM iowa
Vehicle:
2000 580Whp The RSTI
SRP

Default

Very nice guys! keep up the good work!
jnorth85 is offline   Reply With Quote
Old 11-04-2010, 01:16 PM   #428
seanathanq83
Scooby Guru
 
Member#: 173241
Join Date: Feb 2008
Chapter/Region: TXIC
Location: Houston, Tx
Vehicle:
2002 s256 twinscroll
now with one more gear

Default

Quote:
Originally Posted by DigitalPunk View Post
my gas mileage with a regular vf37 is horrific! close to 10/g. anyone else having this issue? i wonder if the blouch will increase it. even if by a margin
wow dude even on e85 driving as aggresive as i can all the time i still get around 14-15mpg mt friends dom3 sti gets 17-18 and he does alot of spirtited driving i think you have a leak or something man
seanathanq83 is offline   Reply With Quote
Old 11-04-2010, 09:50 PM   #429
DigitalPunk
Scooby Specialist
 
Member#: 124236
Join Date: Aug 2006
Chapter/Region: SWIC
Location: Albuquerque
Vehicle:
2006 WRX Built EJ257
Version 8 Twinscroll

Default

i guess i'd better look into that. not much time these days
DigitalPunk is offline   Reply With Quote
Old 11-15-2010, 10:16 PM   #430
Mortal2None
Scooby Newbie
 
Member#: 190077
Join Date: Sep 2008
Chapter/Region: Tri-State
Location: L.I. N.Y.
Vehicle:
2006 Subaru LGT BP
OBP

Default

I would love to see a pick of the turbine side of the Blouch modded VF37. Anyone else other then TIC taken the plunge yet?
Mortal2None is offline   Reply With Quote
Old 11-16-2010, 03:02 AM   #431
Krang
Scooby Specialist
 
Member#: 134272
Join Date: Dec 2006
Chapter/Region: HIIC
Location: Kailua, Hawaii
Vehicle:
2002 WRX Wagon - WRB
ej207 v8 vf37

Default

Figured some peeps in here could use this information. I have compiled methods/companies that produce solutions to twinscroll downpipes for stock location turbos HERE

Last edited by Krang; 11-16-2010 at 05:25 AM.
Krang is offline   Reply With Quote
Old 11-16-2010, 04:48 AM   #432
Concillian
Scooby Guru
 
Member#: 4414
Join Date: Feb 2001
Location: Dublin, CA
Vehicle:
2002 WRX Sedan
Midnight Black

Default

Quote:
Originally Posted by Krang View Post
Figured some peeps in here could use this information. I have compiled methods/companies that produce solutions to twinscroll downpipes for stock location turbos here: http://forums.nasioc.com/forums/show...5#post32472175
Here's a link to the thread I think you were trying to link to that actually works:
http://forums.nasioc.com/forums/show....php?t=2088279
Concillian is offline   Reply With Quote
Old 11-16-2010, 05:27 AM   #433
Krang
Scooby Specialist
 
Member#: 134272
Join Date: Dec 2006
Chapter/Region: HIIC
Location: Kailua, Hawaii
Vehicle:
2002 WRX Wagon - WRB
ej207 v8 vf37

Default

I don't know why it wasn't working, the first couple times I clicked on the link it worked
Krang is offline   Reply With Quote
Old 11-21-2010, 11:00 PM   #434
Moore Performance
NASIOC Vendor
 
Member#: 231489
Join Date: Dec 2009
Chapter/Region: MAIC
Location: Pittsburgh, Pa
Default

Quote:
Originally Posted by Krang View Post
Figured some peeps in here could use this information. I have compiled methods/companies that produce solutions to twinscroll downpipes for stock location turbos HERE
Very good info and we're also working on getting a DP together soon. The pricing I'm seeing sounds about right, but we hope to offer some new options and new a design to this market. I hope to have updates soon, but we have a few other projects on our plate right now that we're working on finishing up first. I'll post updates when I can!
Moore Performance is offline   Reply With Quote
Old 11-22-2010, 01:35 PM   #435
HASTIhatch
Scooby Newbie
 
Member#: 172694
Join Date: Feb 2008
Chapter/Region: MAIC
Location: San Francisco, CA
Vehicle:
2011 WRX STi

Default

Very nice- excited. Subscribed
HASTIhatch is offline   Reply With Quote
Old 11-23-2010, 11:50 AM   #436
trick3d
Scooby Specialist
 
Member#: 202146
Join Date: Feb 2009
Chapter/Region: SCIC
Location: My Island
Vehicle:
2010 evoru
GG

Default

Quote:
Originally Posted by LittleBlueGT View Post
3. Sorry, but that info is incorrect.

Numerous shops have done dynos back to back of cars with heavier wheels and noticed essentially 0% difference in whp.

1.Lighter components do not lower the whp of a car, 2.they take more time to accelerate, yes. If you did a dyno run in 1st gear that lasted 1.5 seconds, you would notice a difference, but when you do runs that take 10+ seconds the difference is negligible.
I must quote this for its semi-fail.
1. He was saying they would increase them not lower them.
2. No they dont, lighter means they accelerate quicker.
3. How can he be incorrect if you are seeing change, regardless of impact.

Please dont jump to disprove something when your argument has not been thought out.
trick3d is offline   Reply With Quote
Old 11-23-2010, 12:57 PM   #437
LIQUIDSK8S
Scooby Specialist
 
Member#: 22605
Join Date: Aug 2002
Location: Boca Raton, FL
Vehicle:
2002 JDM STI/WRX
WRB

Default

Quote:
Originally Posted by trick3d View Post
I must quote this for its semi-fail.
1. He was saying they would increase them not lower them.
2. No they dont, lighter means they accelerate quicker.
3. How can he be incorrect if you are seeing change, regardless of impact.

Please dont jump to disprove something when your argument has not been thought out.
I believe he made a typo and meant heavier not lighter.
LIQUIDSK8S is offline   Reply With Quote
Old 11-23-2010, 10:13 PM   #438
sumfoo1
Scooby Specialist
 
Member#: 82146
Join Date: Mar 2005
Chapter/Region: South East
Location: Raleigh, NC (Brier Creek)
Vehicle:
2005 Legacy GT
OBP

Default

Wheel/tire hell even brake moment of inertia directly effects hp (not exactly weight but close) look it up on Sean hyland's dyno they lost 5 whp on a mustang (dyno and car) by putting on lighter brakes that were larger diameter thus had a higher moment of inertia. Being that tires on on the outside of the wheel package 1lb lighter tires gain more hp than 1lb lighter wheels. It's not just the weight of the wheels but the distribution of that weight. Hypothetically if a wheel had a 10lb rim 5lb hub and 4 lb spokes and another wheel had a 5 lb rim 10lb hub and 5 lb spokes the heavier wheel would actually yield more wheel horsepower but these are bs examples and rarely does a heavier wheel have a lighter rim than a light wheel. Just trying to teach some physics and say rotational weight has a direct effect on whp but where that weight is located on the rotating object has a huge effect too ( closer to the center the better)
sumfoo1 is offline   Reply With Quote
Old 11-29-2010, 01:01 AM   #439
MilesToEmpty
Scooby Specialist
 
Member#: 129031
Join Date: Oct 2006
Chapter/Region: MAIC
Location: Point of Rocks
Vehicle:
98 RSTi
JBP

Default

Quote:
Originally Posted by DigitalPunk View Post
my gas mileage with a regular vf37 is horrific! close to 10/g. anyone else having this issue? i wonder if the blouch will increase it. even if by a margin
That cant be right.

My v8 swapped RSTI tuned safely at 305whp on the vf37 I can easily get 27 out of during the summer.

And are these in production yet?

I want to upgrade to something larger then the vf37 but stay with the twin scroll setup since everything on my car is setup for it... Plus I love the response and constant power.
MilesToEmpty is offline   Reply With Quote
Old 11-30-2010, 09:53 PM   #440
MilesToEmpty
Scooby Specialist
 
Member#: 129031
Join Date: Oct 2006
Chapter/Region: MAIC
Location: Point of Rocks
Vehicle:
98 RSTi
JBP

Default

Quote:
Originally Posted by WMP View Post
MilesToEmpty,

Did TXS notch their off-the-shelf bell-mouth with a plasma cutter etc then cut a smaller diameter pipe lengthwise for the extended piece, if that makes sense? Or did they bend the extended piece from a flat piece of steel?
Sorry, I just dug back a few pages and saw this.

I honestly couldnt tell you how they made it. The next time Im up there I'll ask Brandon or Jermaine. Brandon did an incredible job on it. I think I remember Brandon saying he used another piece of piping and bent it to the correct shape. Sadly he works at another shop though

If I ever take it out Ill take photos of it for sure... But thats not going to happen till I figure which turbo to upgrade my VF37 from lol.
MilesToEmpty is offline   Reply With Quote
Old 12-02-2010, 04:53 AM   #441
Prevent
*** Banned ***
 
Member#: 149114
Join Date: May 2007
Location: I'm too mainstream
Default

Besides the posted linked above, anyone else have an easy but successful twin-scroll downpipe solution ?
Prevent is offline   Reply With Quote
Old 12-02-2010, 11:14 AM   #442
seanathanq83
Scooby Guru
 
Member#: 173241
Join Date: Feb 2008
Chapter/Region: TXIC
Location: Houston, Tx
Vehicle:
2002 s256 twinscroll
now with one more gear

Default

im sure it was already posted, but i just welded the twinscroll flange onto my stock down pipe, if you lay it on top two holes lines up, then just cut off one of the other tabs and weld her up, works wonders, dont have any problems, just need a little bit longer bolts
seanathanq83 is offline   Reply With Quote
Old 12-02-2010, 11:50 AM   #443
Prevent
*** Banned ***
 
Member#: 149114
Join Date: May 2007
Location: I'm too mainstream
Default

^^

ANy pics ?
Prevent is offline   Reply With Quote
Old 12-02-2010, 11:08 PM   #444
seanathanq83
Scooby Guru
 
Member#: 173241
Join Date: Feb 2008
Chapter/Region: TXIC
Location: Houston, Tx
Vehicle:
2002 s256 twinscroll
now with one more gear

Default

i can get some i will post them tomorrow
seanathanq83 is offline   Reply With Quote
Old 01-10-2011, 05:08 PM   #445
LIQUIDSK8S
Scooby Specialist
 
Member#: 22605
Join Date: Aug 2002
Location: Boca Raton, FL
Vehicle:
2002 JDM STI/WRX
WRB

Default

Any updates to the testing???
LIQUIDSK8S is offline   Reply With Quote
Old 02-05-2011, 10:46 PM   #446
Mortal2None
Scooby Newbie
 
Member#: 190077
Join Date: Sep 2008
Chapter/Region: Tri-State
Location: L.I. N.Y.
Vehicle:
2006 Subaru LGT BP
OBP

Default

He's dead Jim!!!
Mortal2None is offline   Reply With Quote
Old 02-06-2011, 12:14 PM   #447
Turn in Concepts
NASIOC Vendor
 
Member#: 93646
Join Date: Aug 2005
Chapter/Region: MWSOC
Vehicle:
Many Track Records
Let us help you go fast!

Default

Updates?

none to really report. Car runs fine. Been daily driving it. Bone stock motor has 94k on it so need to refresh soon. I have some plans and ideas. especially for the breathing on the top end that was pointed out.

we've been crazy busy so our own cars get pushed aside to take care of cars for customers (and also why I'm at the shop on a Sunday replacing the steering rack on the wife's outback).
Turn in Concepts is offline   Reply With Quote
Old 02-06-2011, 12:25 PM   #448
Sinister_kid
Scooby Specialist
 
Member#: 230988
Join Date: Nov 2009
Chapter/Region: NWIC
Location: The compound
Vehicle:
2006 WRX
SGM

Default

Quote:
Originally Posted by Turn in Concepts View Post
Updates?

none to really report. Car runs fine. Been daily driving it. Bone stock motor has 94k on it so need to refresh soon. I have some plans and ideas. especially for the breathing on the top end that was pointed out.

we've been crazy busy so our own cars get pushed aside to take care of cars for customers (and also why I'm at the shop on a Sunday replacing the steering rack on the wife's outback).
And superbowl sunday. Damn she is lucky.
Sinister_kid is offline   Reply With Quote
Old 03-01-2011, 02:15 AM   #449
chudlo
Scooby Specialist
 
Member#: 15505
Join Date: Feb 2002
Chapter/Region: TXIC
Vehicle:
2002 JDMV8 STI Wagon

Default

Quote:
Originally Posted by Moore Performance View Post
Very good info and we're also working on getting a DP together soon. The pricing I'm seeing sounds about right, but we hope to offer some new options and new a design to this market. I hope to have updates soon, but we have a few other projects on our plate right now that we're working on finishing up first. I'll post updates when I can!
Any updates/progress on getting a twin scroll downpipe manufactured? I need to buy one soon and would love to just order a pipe already welded up, ready to go.
chudlo is offline   Reply With Quote
Old 03-01-2011, 03:14 AM   #450
Prevent
*** Banned ***
 
Member#: 149114
Join Date: May 2007
Location: I'm too mainstream
Default

i wish there were more 42" long twinscroll downpipes


im currently fabbing up my own with an ebay usdm downpipe and cutting the bellmouth off OEM, getting it aligned is a bitch :/
Prevent 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
APS twin scroll rotated turbo kit TSR-70 who would buy it or not? 949 Factory 2.5L Turbo Powertrain 237 02-07-2010 12:16 PM
my new gp moto twin scroll rotated turbo! 06redsuby Factory 2.5L Turbo Powertrain 20 02-15-2008 12:30 AM
Twin Scroll BB Info needed . discopotato03 Factory 2.0L Turbo Powertrain 2 05-10-2007 11:41 AM
New APS twin-scroll BB rotated turbo FOR USDM STI's!!! keaniegenie Factory 2.5L Turbo Powertrain 191 01-10-2007 01:12 PM
Will the new STI use a twin-scroll IHI turbo? bsix STi Forum Archive 0 01-09-2003 01:54 PM


All times are GMT -4. The time now is 07:34 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.