Welcome to the North American Subaru Impreza Owners Club Tuesday September 16, 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 08-22-2002, 05:18 AM   #1
Diversion
Scooby Specialist
 
Member#: 18651
Join Date: May 2002
Chapter/Region: South East
Location: Jacksonville, Florida
Vehicle:
2013 Civic Si Sedan
PMM

Default Is there any higher performing injectors for the WRX besides the STi?

Is there a reason people use the STi injectors? Are there no other injectors out in the aftermarket that exceed the performance of 565cc of flow? How much WHP can be made from the STi injectors? When is it necessary to need higher than 565cc injectors?

Jay
* Registered users of the site do not see these ads.
Diversion is offline   Reply With Quote
Old 08-22-2002, 08:23 AM   #2
Pavlo
Scooby Specialist
 
Member#: 23015
Join Date: Aug 2002
Location: Wellingborough, UK
Vehicle:
95-> GC8
Black, blue and blue

Default

565cc per minute should be okay for about 400 crank (break) HP, on standard fuel pressure, which is 3 bar above manifold pressure. However the duty cycles will probably be higher than 85%, which is a nice number to stay below.

You can up the fuel pressure using an adjustable regulator to 4 bar above manifold, provided your fuel pump can keep up, which I doubt an sti one can. The 4 bar will give you another 15% flow, so they will flow like 650cc injectors, which should be enough for any power you are likely to get from 2litre with a VF series turbo.

If you find you want bigger injectors, you can use 740cc secondaries out of the twin turbo Mazda RX-7, which should fit straight into your current fuel rails. You can also fit injectors compatible with the later Nissan Skylines, you can get Nismo uprated ones in sizes up to about 1000cc per minute.

If you want wheel HP, take .75 of the crank hp for a reasoble estimate.

Paul
Pavlo is offline   Reply With Quote
Old 08-22-2002, 08:40 AM   #3
STi_Pete
Scooby Newbie
 
Member#: 14576
Join Date: Jan 2002
Location: Long Island N.Y.
Vehicle:
2002 WRX Sedan
Silver

Default

lil easier than the last suggestion.....


Power Enterprises 650 drop in injectors...
STi_Pete is offline   Reply With Quote
Old 08-22-2002, 09:04 AM   #4
morphgabbin
Scooby Newbie
 
Member#: 15466
Join Date: Feb 2002
Location: oh
Vehicle:
2002 wrx
silver

Default

denzo makes 800cc for the WRX, but I think you need a stand alone to run them.
morphgabbin is offline   Reply With Quote
Old 08-22-2002, 09:10 AM   #5
Pavlo
Scooby Specialist
 
Member#: 23015
Join Date: Aug 2002
Location: Wellingborough, UK
Vehicle:
95-> GC8
Black, blue and blue

Default

Well, I don't know what's hard about fitting skyline or rx-7 injectors, they drop straight in.

Might be harder to find some in the US. Here a set of injectors costs upwards of about 400 ($600 ish) new, whereas i can get RX-7 injectors for about 40 each from a Japanese car breakers yard.

I think the easiest thing would be a an adjustable fuel pressure regulator, and raise the fuel pressure to 4 bar above manifold pressure. Probably set you back about $120 US.

But as said above, you will need a different ECU. A S-AFC or something will sort of do it, but if you fool the ECU into think the airflow is different you will also advance the ignition. As the ECU uses airflow as a load measurement for the fuel and ignition maps, and as you would have to lean it out, it would think there was less load, so put on more advance. If you have already raised the boost you might be screwed.

Paul
Pavlo is offline   Reply With Quote
Old 08-22-2002, 09:28 AM   #6
alfriedesq
Scooby Guru
 
Member#: 6788
Join Date: May 2001
Location: Stamford, CT 06902
Vehicle:
2005 STI
10.9 @ 130

Default

I'm working with PS right now to come up with some of the 650 injectors that have the spray turned 90 degrees so that you can use the stock WRX injector plug placement - critical for GDB's - but not so critical on GDA's

Anyway - in a few days I will have pricing and will post info on a gruop buy
alfriedesq is offline   Reply With Quote
Old 08-22-2002, 12:54 PM   #7
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 Pavlo
565cc per minute should be okay for about 400 crank (break) HP
Several people have made 400+whp on the stock STi injectors. Cobb said they were finished at 420awhp (GDA too).
TypeC is offline   Reply With Quote
Old 08-22-2002, 01:55 PM   #8
alfriedesq
Scooby Guru
 
Member#: 6788
Join Date: May 2001
Location: Stamford, CT 06902
Vehicle:
2005 STI
10.9 @ 130

Default

Quote:
Originally posted by TypeC


Several people have made 400+whp on the stock STi injectors. Cobb said they were finished at 420awhp (GDA too).
Well - looking at some of my approx 360 - 380 wheel hp data logs I can see 130 % and 140 % duty cycles on the sti injectors at higher fuel pressure with Perrin rails

While this may actually work of c16 race fuel - - I'd say its less that ideal

My estimate is that the max safe hp for stock injectors si about 265 - 270 wheel hp

and 330 - 340 with sti injectors

Don't forget that on street fuel the WRX likes fairly rich a.f ratios which are hard to maintain at higher boost points without serious fuel supply
alfriedesq is offline   Reply With Quote
Old 08-22-2002, 02:18 PM   #9
Tuning Factory Inc.
Vendor
 
Member#: 3600
Join Date: Jan 2001
Location: Detroit, Michigan, USA
Default

Power Enterprise has 650 and 800cc injectors depending on your needs.
Tuning Factory Inc. is offline   Reply With Quote
Old 08-22-2002, 07:45 PM   #10
Diversion
Scooby Specialist
 
Member#: 18651
Join Date: May 2002
Chapter/Region: South East
Location: Jacksonville, Florida
Vehicle:
2013 Civic Si Sedan
PMM

Default

If you had a 500 horsepower turbo, what injectors would you want? I just want some injectors that will be good with any huge turbo and allow room for tons of power.. I'd hate to spend $400+ on STi injectors and not be able to use the full potential of any of the massive turbos.

Jay
Diversion is offline   Reply With Quote
Old 08-22-2002, 09:53 PM   #11
rayder
Scooby Specialist
 
Member#: 14535
Join Date: Jan 2002
Location: SoCal
Vehicle:
02 Impreza WRX
Silver

Default

Blitz will be releasing adapters that will fit their injectors to the WRX very shortly.
rayder 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
Is there any way to post an embedded video using the html code from the website? Neek Off-Topic 7 08-21-2009 04:14 PM
are there any difference in us and canadian sti's besides the tac? andrewfraser310 Newbies & FAQs 13 04-20-2005 07:40 PM
Is there any ride height control for WRX GregUnd Texas Impreza Club Forum -- TXIC 26 11-13-2002 08:54 AM
Are there any good body kits for the wrx besides the c-west kit. faceplate Interior & Exterior Modification 1 06-08-2002 01:34 AM
is there a titanuim body kit for 2002 WRX STI? heheyama Interior & Exterior Modification 31 05-17-2002 02:52 AM


All times are GMT -4. The time now is 01:43 PM.


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.