Welcome to the North American Subaru Impreza Owners Club Thursday March 28, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L 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.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 04-24-2006, 09:28 PM   #1
WRXDrUnKiE
Scooby Newbie
 
Member#: 69608
Join Date: Sep 2004
Chapter/Region: TXIC
Location: Austin, TX
Vehicle:
2004 STi
Silver

Default Bigger Injectors with a stock STi?

I am going to be rebuilding an STi I just bought and I would like to put some forged pistons and helix 860cc injectors. Does anyone know if I can do this and keep it stock without running into any problems. I am upgrading to a gt30R kit later on and dont want to have to replace injectors and pistons then if it will be out of the car now.

-Matt
* Registered users of the site do not see these ads.
WRXDrUnKiE is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 04-24-2006, 09:41 PM   #2
STimo
Scooby Specialist
 
Member#: 110273
Join Date: Mar 2006
Location: OC, California
Vehicle:
450 whp 30R STI
10.96@126

Default

DO NOT run bigger injectors without engine management, you can ruin your motor.

If you plan on installing forged pistons, i would also look into doing to whole bottom end while you are in there. It costs quite a bit to pull the motor and open it up. My suggestion is while you are in there, you should upgrade everything so you don't have a weak link.
STimo is offline   Reply With Quote
Old 04-24-2006, 10:06 PM   #3
WRXDrUnKiE
Scooby Newbie
 
Member#: 69608
Join Date: Sep 2004
Chapter/Region: TXIC
Location: Austin, TX
Vehicle:
2004 STi
Silver

Default

What weak links other than pistons would I have to worry about? And I couldnt use an SAFC or anything or an AP?
WRXDrUnKiE is offline   Reply With Quote
Old 04-24-2006, 11:16 PM   #4
STI2005PR
Scooby Newbie
 
Member#: 68988
Join Date: Aug 2004
Location: NC
Vehicle:
2015 STI
Grey

Default

Quote:
Originally Posted by STimo
DO NOT run bigger injectors without engine management, you can ruin your motor.

If you plan on installing forged pistons, i would also look into doing to whole bottom end while you are in there. It costs quite a bit to pull the motor and open it up. My suggestion is while you are in there, you should upgrade everything so you don't have a weak link.
And why will he ruin his motor? He will run very rich and that's about it.
STI2005PR is offline   Reply With Quote
Old 04-24-2006, 11:25 PM   #5
TypeC
Scooby Guru
 
Member#: 9794
Join Date: Aug 2001
Chapter/Region: TXIC
Location: Texas
Vehicle:
02 2.5LWRX-Retired
335i w/twins

Default

Quote:
Originally Posted by STI2005PR
And why will he ruin his motor? He will run very rich and that's about it.
For one, the car won't start nor idle with 800cc injectors. Secondly, you'll wash the bores and contaminate the oil with overfueling.

Simple answer, don't do injectors unless you have EM. Used EM is only $500 anyway.
TypeC is offline   Reply With Quote
Old 04-24-2006, 11:29 PM   #6
billy720
Scooby Newbie
 
Member#: 76903
Join Date: Dec 2004
Chapter/Region: MAIC
Location: Northern Virginia
Vehicle:
2004 WRX STi
Silver

Default

if you're gonna spend money to get pistons put in,you might as well do everything at one time to save money.mine is in the process of being rebuilt as we speak.my valves floated so i decided i might as well get it rebuilt since it was gonna cost me a lot to get them fixed.I dropped $8k for the project.Custom forged pistons and rods,rod and main bearings,arp headstuds,darton race sleeves,new gaskets,ferrea valves,retainers,locks,seals.other mods on the car right nowerrin catless race pipes,hks 3inch turboback,perrin 816ccs,perrin fuel rail,walbro fuel pump,utec,fp green,aps dr725,clutchmaster single plate clutch w/flywheel
billy720 is offline   Reply With Quote
Old 04-24-2006, 11:36 PM   #7
billy720
Scooby Newbie
 
Member#: 76903
Join Date: Dec 2004
Chapter/Region: MAIC
Location: Northern Virginia
Vehicle:
2004 WRX STi
Silver

Default

forgot to add that i was upgrading from the green to gt35R.i'm selling my green if ur intersted.1500k miles on it.1250shipped
billy720 is offline   Reply With Quote
Old 04-25-2006, 12:04 AM   #8
bboy
Scooby Specialist
 
Member#: 56468
Join Date: Mar 2004
Chapter/Region: NWIC
Location: Seattle, WA
Vehicle:
04 Improved STI
Dirty White

Default

Quote:
Originally Posted by TypeC
For one, the car won't start nor idle with 800cc injectors. Secondly, you'll wash the bores and contaminate the oil with overfueling.

Simple answer, don't do injectors unless you have EM. Used EM is only $500 anyway.
100% correct. Engine Management should be THE FIRST MOD EVERYTHING ELSE DEPENDS ON TUNING WITH IT.

Buy a Walbro pump.

Think about calling a reputable performance shop/vendor and discussing an upgrade path. If you are yanking the motor, there's tons of stuff you can do while it's out. I recommend www.worldoneperformance.com becuase I know all of them well.
bboy is offline   Reply With Quote
Old 04-25-2006, 09:20 AM   #9
STI2005PR
Scooby Newbie
 
Member#: 68988
Join Date: Aug 2004
Location: NC
Vehicle:
2015 STI
Grey

Default

Quote:
Originally Posted by TypeC
For one, the car won't start nor idle with 800cc injectors. Secondly, you'll wash the bores and contaminate the oil with overfueling.

Simple answer, don't do injectors unless you have EM. Used EM is only $500 anyway.
Actually your wrong. My car started fine, idle fine and drove fine with 810cc injectors. The problem came when I past 4,000rpms that it would run very rich.
STI2005PR is offline   Reply With Quote
Old 04-25-2006, 09:36 AM   #10
jays05
Scooby Specialist
 
Member#: 78165
Join Date: Dec 2004
Chapter/Region: South East
Location: SC
Vehicle:
05 STI 35r + e85

Default

Swapping injectors with the motor in the car is really easy.
jays05 is offline   Reply With Quote
Old 04-25-2006, 04:15 PM   #11
Uncle Scotty
*** Banned ***
 
Member#: 16200
Join Date: Mar 2002
Vehicle:
OK buy Nates beans
westcoastroasting.com

Default

Quote:
Originally Posted by jays05
Swapping injectors with the motor in the car is really easy.
^^^^^^^^
Uncle Scotty is offline   Reply With Quote
Old 04-25-2006, 04:18 PM   #12
overdose
Scooby Specialist
 
Member#: 46399
Join Date: Oct 2003
Chapter/Region: MWSOC
Location: Grand Rapids, MI
Vehicle:
0000 Knows nothing,
about nothing.

Default

Quote:
Originally Posted by Uncle Scotty
^^^^^^^^
it is with the sti (not sure on the newer 06 2.5 wrx's), but 1/10th as hard as the GBOD's and the 2 litre
overdose is offline   Reply With Quote
Old 04-25-2006, 05:14 PM   #13
WRXDrUnKiE
Scooby Newbie
 
Member#: 69608
Join Date: Sep 2004
Chapter/Region: TXIC
Location: Austin, TX
Vehicle:
2004 STi
Silver

Default

Im coming off of an 02 wrx, injectors took a while for us.
WRXDrUnKiE 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
Will I need bigger injectors with these mods? gtasti Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 5 06-25-2008 05:22 PM
Injectors with a stock turbo? bendavi17 Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 16 03-13-2007 10:51 AM
Whats wrong with the stock STi injectors? jdiddy Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 7 10-05-2006 09:24 AM
Bigger Injector with light mods? wrathfirex Engine Management & Tuning 5 02-01-2004 11:43 PM
anyone run a bigger turbo with the stock top mount? blackie Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 21 10-03-2003 01:30 PM

All times are GMT -4. The time now is 04:01 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.