Welcome to the North American Subaru Impreza Owners Club Wednesday September 17, 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 > Water/Methanol Injection, Nitrous & Intercooler Cooling

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 08-15-2006, 06:18 PM   #1
avriette
Scooby Newbie
 
Member#: 115968
Join Date: May 2006
Location: washington, dc
Vehicle:
2006 Impreza WRX STI
Black

Default Nitrous even possible on 06 STI?

So I understand that once you get to 17psi of boost not only is your turbo way out of its efficiency, but your injectors are at 100%. This would seem to me to indicate that a "dry" nitrous system is out of the question unless you were doing something like a 25 shot. And even then, the power would more likely be coming from the fact that you just cooled your intake charge with liquid N2O.

Is nitrous possible on a stock STI? I would expect that going with a new turbo (like one of those fancy ball bearing garret units), and the accompanying fuel upgrades would make a wet nitrous system possible. But I don't see any nitrous threads (except one which was kind of misguided).

I guess the other question is that since the car is geared so shortly, is there really any point in running a wet nitrous system? It would put a lot of torque on the differentials, probably lose traction, and since you're going to be limited to 160 anyways, it's not as if you're going to magically be the 200mph STI at the drag strip, right?
* Registered users of the site do not see these ads.
avriette is offline   Reply With Quote
Old 08-15-2006, 06:45 PM   #2
hippy
Scooby Specialist
 
Member#: 36528
Join Date: May 2003
Location: florida
Vehicle:
2002 Impreza Wrx
Silver

Default

The turbo isn't necessarily in a bad efficiency range just cause it's at 17psi. It depends on how much the turbo is flowing. The fuel system also. You're not gonna max the fuel system out at 25psi even, until you get to a high enough rpm range that the turbo outflows the fuel system at a given a/f ratio. This means you can run a dry shot on an 06, just maybe moreso at lower rpms. Using n2o increases the efficiency of the turbo at a given boost, since the turbo isn't puting out as much air at a given boost with n2o running as without. This could be a good bonus for people who run out of steam uptop.

You shouldn't need any fuel upgrades to run a wet n2o system, other then a fuel pump if the stock one can't do the job. Just cause you get more power, that doesn't mean the tires will just spin from it in every gear. If n2o is making an engine put out more power without hurting performance in any way, I don't see how the car could accelerate slower.

On the note of the 6 speed tranny, I always wondered how people did that with sti's. Maybe it would be good to skip a gear or two with big hp?

peace
hippy is offline   Reply With Quote
Old 08-15-2006, 07:54 PM   #3
di2co
Scooby Newbie
 
Member#: 105648
Join Date: Jan 2006
Vehicle:
2006 STI
wrb

Default

I was thinking about this too but I decided against it. The vf39 already has boost creep issues and I think trying to run a 50 shot through the tiny wastegate flapper and housing would only make things worse. I could be wrong but I'm planning on an ewg setup. I like the idea of a bracket to hold the iwg closed when I run external and being able to flash back (cobb ap) to my base map when I get tired of the noise.

Jacob
di2co is offline   Reply With Quote
Old 08-15-2006, 08:26 PM   #4
hippy
Scooby Specialist
 
Member#: 36528
Join Date: May 2003
Location: florida
Vehicle:
2002 Impreza Wrx
Silver

Default

I totally agree with that. Running n2o would make the wastegate need to work harder to hold a given boost because of at least two reasongs. There would be more exhaust gas at a given boost from there being more o2 and fuel in the mix, and the compressor wouldn't be puting out as much flow as normal at that boost because the n2o is taking over part of it's job. This could be bad for people with boost creep.

peace

Last edited by hippy; 08-15-2006 at 09:08 PM.
hippy is offline   Reply With Quote
Old 08-20-2006, 08:58 PM   #5
Ultimate Collision Center
Vendor
 
Member#: 69072
Join Date: Aug 2004
Chapter/Region: Tri-State
Location: Peekskill
Default

N20 is possible with a sti but you need to get atleast a boost controller and a wideband o2 sensor to hook it up....
Ultimate Collision Center is offline   Reply With Quote
Old 08-25-2006, 01:19 PM   #6
LIGHTNINGDRIVER
Scooby Newbie
 
Member#: 106001
Join Date: Jan 2006
Location: Georgia
Vehicle:
2006 STI
WRC Blue

Default

will let you know what i findout in about a month i will have a 75 shot wet kit from nx.
but will be set up to help eliviate tubo lag on the 42R.
LIGHTNINGDRIVER is offline   Reply With Quote
Old 08-25-2006, 02:25 PM   #7
dvang
Scooby Specialist
 
Member#: 84188
Join Date: Mar 2005
Chapter/Region: MWSOC
Location: its too cold
Vehicle:
05 legacy
caravan full of kids now

Default

wet kit install in intercooler TB connection. seen it done b4 search it
dvang is offline   Reply With Quote
Old 08-29-2006, 10:46 PM   #8
Legba
Scooby Specialist
 
Member#: 88589
Join Date: Jun 2005
Location: Where the action is
Vehicle:
2012 STI
the best one

Default

I thought the theoretical top speed of the STi, if you removed the electronic limiter and had enough power, is something like 186mph at redline in 6th.
Legba is offline   Reply With Quote
Old 08-29-2006, 10:46 PM   #9
Legba
Scooby Specialist
 
Member#: 88589
Join Date: Jun 2005
Location: Where the action is
Vehicle:
2012 STI
the best one

Default

I know I saw that somewhere on here.
Legba is offline   Reply With Quote
Old 08-29-2006, 11:44 PM   #10
stirob
Scooby Specialist
 
Member#: 93631
Join Date: Aug 2005
Chapter/Region: TXIC
Location: Pearland Tx.
Vehicle:
2014 CTS-V
Opulent Blue Mtallic

Default

I believe top speed is limited to 176mph by the STi's gearing.
stirob is offline   Reply With Quote
Old 08-30-2006, 07:58 AM   #11
Legba
Scooby Specialist
 
Member#: 88589
Join Date: Jun 2005
Location: Where the action is
Vehicle:
2012 STI
the best one

Default

I thought that it was more than that. Maybe I am thinking that was at the rev limiter and not redline. I know I saw 18Xmph on here posted by some smarty.
Legba 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
fender flare possibilities on 06? habitatxskate Interior & Exterior Modification 14 11-28-2009 03:12 AM
cracked piston, not even 11k on 07 sti MERT K Factory 2.5L Turbo Powertrain 282 05-14-2008 09:34 PM
Possible stolen 06 sti? cueball89 Tri-State Area Forum 19 08-09-2006 07:26 PM
Cat Back Exhaust on 06 STi, possible defuser problem? patrick smith Factory 2.5L Turbo Powertrain 2 07-24-2006 01:23 PM


All times are GMT -4. The time now is 11:58 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.