Welcome to the North American Subaru Impreza Owners Club Friday April 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 > Normally Aspirated 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 12-05-2002, 09:16 PM   #1
AustinSTi
Scooby Specialist
 
Member#: 9386
Join Date: Aug 2001
Location: H-Market, VA & JMU
Vehicle:
2000 2.5rs sedan
silverthorn

Default Question about actually USING n20

I've been doing a lot of searches, but I have not come across one addressing exactly how to use it. More specifically using a dry zex kit. In the threads I previously read, it said that once you have the switch flipped to on, its sprays automatically at WOT. Is this correct? If it is, how exactly would you not use it in 1st and 2nd gear(which most of you advise against due to hitting the rev limiter). The only thing I can think of, is to flip the switch after 2nd?? But trying to shift, drive, and hit a switch all at the same time seems pretty difficult. Is there something obvious that I'm just missing?
* Registered users of the site do not see these ads.
AustinSTi is offline   Reply With Quote
Old 12-05-2002, 10:31 PM   #2
Ghomer1
Scooby Specialist
 
Member#: 8091
Join Date: Jul 2001
Chapter/Region: MAIC
Location: Near Annapolis, MD
Vehicle:
2007 335i
Monaco Blue Metallic

Default

Yes, this system works off of the TPS and is active at only wide open throttle.

In response to your question, there is no reason why you can't use this in first and second gear...as long as you are a decent driver and can let up to shift before you hit the fuel cutoff. As a matter of fact, using it in only third, you will not notice the nitrous nearly as much, as the main kick is in first and second and most of third. You don't feel it hardly at all in fourth and fifth and if you have a stock clutch it will probably slip in fourth and fifth gear pretty badly.

Garret
Ghomer1 is offline   Reply With Quote
Old 12-05-2002, 11:38 PM   #3
kturner
Scooby Newbie
 
Member#: 8225
Join Date: Jul 2001
Location: Corvallis, OR
Default

I have this kit too. It will rev very quickly in first and even second. You have to be careful if spraying in those gears. Hitting the rev limiter would be a bad thing. It isn't much of a problem for me though since I blast it mostly in 3rd and even 4th for highway passing. As long as you stay off absolute WOT, it won't go off - it takes that last little push.
kturner is offline   Reply With Quote
Old 12-06-2002, 12:12 AM   #4
Mauricio
Scooby Specialist
 
Member#: 2823
Join Date: Nov 2000
Chapter/Region: TXIC
Location: Houston
Default

couldn't you just put something behind your pedal to keep you from going WOT?
Mauricio is offline   Reply With Quote
Old 12-06-2002, 12:24 AM   #5
AndyM
Scooby Specialist
 
Member#: 3219
Join Date: Dec 2000
Chapter/Region: MWSOC
Location: Arlington Heights, IL USA
Vehicle:
2004 Impreza WRX STi
WR Blue Pearl

Default

Its not that hard to control the nitrous. It does take that extra push to arm the nitrous. Meaning you have to have it all the way to the floor you move it up the slightest bit and it cuts off. Man I guess I have been missing out I only spray once on 3rd gear and then sometimes I spray in 4th to but thats it. Boy do I need a bottle heater too...
AndyM is offline   Reply With Quote
Old 12-06-2002, 12:29 AM   #6
AndyM
Scooby Specialist
 
Member#: 3219
Join Date: Dec 2000
Chapter/Region: MWSOC
Location: Arlington Heights, IL USA
Vehicle:
2004 Impreza WRX STi
WR Blue Pearl

Default

...what I do is I flip the switch on jet to about 30 mph then hit the nitrous until I get to 5,800 RPM (somewhere around there) then I let off the gas a little shift into 4th then hit the nitrous again. After that when I shift into 5th I turn off the switch.

How is everybody's Nitrous system doing?

Any good runs, got any tips that you have learned?

I love when people post, it gives me a chance to talk to other Subaru owners about nitrous
AndyM is offline   Reply With Quote
Old 12-06-2002, 12:47 AM   #7
DrBoy01
Scooby Specialist
 
Member#: 20444
Join Date: Jun 2002
Chapter/Region: MAIC
Location: Wilmington, DE|Berkeley
Vehicle:
2006 Outback 2.5 XT
Garnet Red Pearl 5MT

Default

I'm also interested to see how 4EAT Subaru owners use their N20 I've never actually seen N20 used with my own eyes, I think their experience would really help me decide whether I should get one or not.

Hopefully Kevin Thomas will come around and enlighten me
DrBoy01 is offline   Reply With Quote
Old 12-06-2002, 02:47 AM   #8
HndaTch627
Scooby Guru
 
Member#: 6551
Join Date: May 2001
Chapter/Region: MWSOC
Location: Carol Stream, IL
Vehicle:
'01 GC8 Dinged STM
'09 Concours 14 ABS Black

Default

what you can do to combat hitting the limter is installing an MSD window Switch unit which will automatically turn the nitrous controls on @ 3k rpm and turn off at your selected speed(i rec shutting down at 6k).

jeremy
HndaTch627 is offline   Reply With Quote
Old 12-06-2002, 12:30 PM   #9
AndyM
Scooby Specialist
 
Member#: 3219
Join Date: Dec 2000
Chapter/Region: MWSOC
Location: Arlington Heights, IL USA
Vehicle:
2004 Impreza WRX STi
WR Blue Pearl

Default

Exactly what Jeremy said for about $100.00 from www.summitracing.com you can get the MSD window switch and (2) sets of RPM pills. I have this and it works great. You just need to go out and buy a 30-amp relay my switch wouldnít work without it. It made my RPMs go up from about 750 to 1,500 RPM got the relay and now it works great. If you do get the switch do not buy MSD its a rip off. I got my 30-amp relay from radio shack for $2.30 beats havening to pay something like 30 for a simple relay.
AndyM is offline   Reply With Quote
Old 12-06-2002, 12:51 PM   #10
nomadtw
Scooby Specialist
 
Member#: 8037
Join Date: Jul 2001
Chapter/Region: MAIC
Location: Mars, PA
Vehicle:
1998 2.5RS - black
2iggpoints

Default

why do you not turn it on till 3000rpm

it seems like you would have the most to gain in the lower rpms' where the car is lacking in power to add the nitrous...
nomadtw is offline   Reply With Quote
Old 12-06-2002, 08:33 PM   #11
Mr. Rogers
Scooby Newbie
 
Member#: 17028
Join Date: Mar 2002
Location: Patiently Waiting for an 05 Legacy STI.
Vehicle:
2002 2.5 TS wagon
Black

Default

Just curious but for those of you with nitrous what other mods do you have ? and are there any mods you should stay away from ?
Mr. Rogers is offline   Reply With Quote
Old 12-06-2002, 10:55 PM   #12
jasona
Scooby Specialist
 
Member#: 11786
Join Date: Oct 2001
Chapter/Region: AKIC
Location: Alaska
Vehicle:
14 Outback 2.5i
Silver

Default

i spray in 2nd all the time, and sometimes towards the end of first. if you mount your switch in a good spot, its really not hard to reach and flip it in between shifts. like i said i can arm it in the middle of 1st and have my hand back on the shift knob ready to go by the end.

Quote:
Originally posted by Mr. Rogers
Just curious but for those of you with nitrous what other mods do you have ? and are there any mods you should stay away from ?
hey, i have an 02 ts too. im running a zex dry kit with a jet in between the 55 and 65 shot jets they give you, so well just say a 60 shot. only other mods are weapon r intake and universal muffler. ive run dead even with firebird formulas from a 20mph rolling start, damn near beat that wrx with an apex exhaust and txs boost controller, and beat a viper through the 1/8th mile at a local track by half a second (granted, that guy probably just couldnt drive, and he SMOKED me after the 1/8th ) my car always still runs rich and the plugs never show any signs of detonation. ive also never recieved a CEL due to it.
jasona is offline   Reply With Quote
Old 12-06-2002, 11:33 PM   #13
kturner
Scooby Newbie
 
Member#: 8225
Join Date: Jul 2001
Location: Corvallis, OR
Default

I think the on-spray rpm point is somewhat gear dependent. You can probably start spraying in lower gears at lower rpms. The main thing I try to do is be into a free revving (one v, two?) range. Lugging the engine is bad anytime, with all that extra fuel and oxidizer, lugging is even worse on nitrous. When most kits spray, they shoot one rate of nitrous in and dump in what is supposed to be a corresponding amount of fuel. So if you're at 2000 rpm making, I don't know maybe 100 hp, and you shoot in a 55 shot you just dumped in 50% more mix. At peak hp 165 the relative increase is 30%. It's a stress thing. Or I have no idea what I'm talking about.
kturner is offline   Reply With Quote
Old 12-07-2002, 03:13 AM   #14
HndaTch627
Scooby Guru
 
Member#: 6551
Join Date: May 2001
Chapter/Region: MWSOC
Location: Carol Stream, IL
Vehicle:
'01 GC8 Dinged STM
'09 Concours 14 ABS Black

Default

Quote:
Originally posted by nomadtw
why do you not turn it on till 3000rpm

it seems like you would have the most to gain in the lower rpms' where the car is lacking in power to add the nitrous...
because spraying nitrous under 3k RPM is a good way to load up a cylinder and bend a rod, the problem is your airflow is not high enough to accurately distribute the nitrous. On a 4 fogger system this isn't too much of an issues(but you still shouldn't spray under 3k RPM) when the bottom end is spinning and making good amounts of power.

jeremy
HndaTch627 is offline   Reply With Quote
Old 12-07-2002, 08:15 AM   #15
Mr. Rogers
Scooby Newbie
 
Member#: 17028
Join Date: Mar 2002
Location: Patiently Waiting for an 05 Legacy STI.
Vehicle:
2002 2.5 TS wagon
Black

Default

Quote:
Originally posted by jasona
i spray in 2nd all the time, and sometimes towards the end of first. if you mount your switch in a good spot, its really not hard to reach and flip it in between shifts. like i said i can arm it in the middle of 1st and have my hand back on the shift knob ready to go by the end.



hey, i have an 02 ts too. im running a zex dry kit with a jet in between the 55 and 65 shot jets they give you, so well just say a 60 shot. only other mods are weapon r intake and universal muffler. ive run dead even with firebird formulas from a 20mph rolling start, damn near beat that wrx with an apex exhaust and txs boost controller, and beat a viper through the 1/8th mile at a local track by half a second (granted, that guy probably just couldnt drive, and he SMOKED me after the 1/8th ) my car always still runs rich and the plugs never show any signs of detonation. ive also never recieved a CEL due to it.

ABout time I heard of a TS on nitrous thanks man.. I was thinking of putting on at least a cat-back exhaust first and then going the nitrous route with a progressive controller. Its an easy mod and when I have lil man in the car I don't need to worry about going to fast cause my foot is heavy LOL.
Mr. Rogers is offline   Reply With Quote
Old 12-07-2002, 02:40 PM   #16
AustinSTi
Scooby Specialist
 
Member#: 9386
Join Date: Aug 2001
Location: H-Market, VA & JMU
Vehicle:
2000 2.5rs sedan
silverthorn

Default

when i was refering to "difficult", i was talking about taking it to a 1/4 mile track and seeing what the car could do. But after reading your responses, it seems that the kit is very sensitive in when it turns on and off? Is that a correct assumption, that with the slightest let off of the accelerator pedal, the n20 stops spraying (aka when i shift), and then comes on quickly when i stomp the pedal again? Or is there some sort of a delay/lag?
AustinSTi is offline   Reply With Quote
Old 12-07-2002, 02:47 PM   #17
HndaTch627
Scooby Guru
 
Member#: 6551
Join Date: May 2001
Chapter/Region: MWSOC
Location: Carol Stream, IL
Vehicle:
'01 GC8 Dinged STM
'09 Concours 14 ABS Black

Default

Quote:
Originally posted by AustinSTi
when i was refering to "difficult", i was talking about taking it to a 1/4 mile track and seeing what the car could do. But after reading your responses, it seems that the kit is very sensitive in when it turns on and off? Is that a correct assumption, that with the slightest let off of the accelerator pedal, the n20 stops spraying (aka when i shift), and then comes on quickly when i stomp the pedal again? Or is there some sort of a delay/lag?
that's what they RPM activated window switch is for, you have a WOT switch that actually controls the N20 flow and the window switch would turn the system off when the car hits 6k rpm so that way by the time you **** the nitrous has been run out of the intake and when you shift you are right back into it.

jeremy
HndaTch627 is offline   Reply With Quote
Old 12-07-2002, 04:36 PM   #18
kturner
Scooby Newbie
 
Member#: 8225
Join Date: Jul 2001
Location: Corvallis, OR
Default

You are basically correct. In most systems, the nitrous starts flowing promptly at whatever point you have set the micro switch or throttle position sensor to interpret as WOT. When you let off throttle to shift. it also stops sparying instantly but takes probably a micro second to flush through the manifold. Then when you hit WOT again, it sprays again. Apparently, you can adjust how fast/hard your system hits by where you locate the spray nozzle. Right at the throttle body will be a bit quicker than 18 inches from the stock air box. Some systems do have delays and variable spray rates that can be programmed. These are used for drag launches to avoid too much wheelspin off the line.
kturner is offline   Reply With Quote
Old 12-07-2002, 06:40 PM   #19
jasona
Scooby Specialist
 
Member#: 11786
Join Date: Oct 2001
Chapter/Region: AKIC
Location: Alaska
Vehicle:
14 Outback 2.5i
Silver

Default

when you program the computer, you have to push the gas pedal in (or if youre doing it by yourself, push the little throttle lever under the hood with your fingers) to the point you want the kit to activate. it you push it all the way, it will only spray when you push the gas pedal all the way. if you only push it like half, then it will start spraying when you hit half throttle.
jasona is offline   Reply With Quote
Old 12-07-2002, 06:45 PM   #20
HndaTch627
Scooby Guru
 
Member#: 6551
Join Date: May 2001
Chapter/Region: MWSOC
Location: Carol Stream, IL
Vehicle:
'01 GC8 Dinged STM
'09 Concours 14 ABS Black

Default

Quote:
Originally posted by jasona
when you program the computer, you have to push the gas pedal in (or if youre doing it by yourself, push the little throttle lever under the hood with your fingers) to the point you want the kit to activate. it you push it all the way, it will only spray when you push the gas pedal all the way. if you only push it like half, then it will start spraying when you hit half throttle.
WARNING: DO NOT USE THE THROTTLE LEVER UNDER THE HOOD

why you ask?? because your gas pedal travel will most likley NEVER pull the plate full WOT and you need to have a WOT threshold...infact you can end up with 2 different WOT percentages just using the pedal in the car, depending on how much pressure you are exerting against the pedal with your foot.

jeremy
HndaTch627 is offline   Reply With Quote
Old 12-08-2002, 04:54 AM   #21
jasona
Scooby Specialist
 
Member#: 11786
Join Date: Oct 2001
Chapter/Region: AKIC
Location: Alaska
Vehicle:
14 Outback 2.5i
Silver

Default

i always use that thing what could go wrong?
jasona is offline   Reply With Quote
Old 12-08-2002, 05:25 AM   #22
HndaTch627
Scooby Guru
 
Member#: 6551
Join Date: May 2001
Chapter/Region: MWSOC
Location: Carol Stream, IL
Vehicle:
'01 GC8 Dinged STM
'09 Concours 14 ABS Black

Default

Quote:
Originally posted by jasona
i always use that thing what could go wrong?
that's for people setting their WOT threshold on the ZEX systems....it's not an accurate way of setting it up as you will never see 100% WOT like you would by turning that cam.

jeremy
HndaTch627 is offline   Reply With Quote
Old 12-08-2002, 11:44 AM   #23
Mr. Rogers
Scooby Newbie
 
Member#: 17028
Join Date: Mar 2002
Location: Patiently Waiting for an 05 Legacy STI.
Vehicle:
2002 2.5 TS wagon
Black

Default

Since we are on the topic.. ANybody have any comments about the uber n20 system , LOL, Venom VCN-2000 ?
Mr. Rogers is offline   Reply With Quote
Old 12-08-2002, 10:44 PM   #24
DrBoy01
Scooby Specialist
 
Member#: 20444
Join Date: Jun 2002
Chapter/Region: MAIC
Location: Wilmington, DE|Berkeley
Vehicle:
2006 Outback 2.5 XT
Garnet Red Pearl 5MT

Default

I'm going to re-ask my question:

Can anyone who has N20 and a 4EAT explain how they use it in their rides (ie. what RPM do you activate the system, how you shift, etc.)?
DrBoy01 is offline   Reply With Quote
Old 12-09-2002, 01:54 AM   #25
HndaTch627
Scooby Guru
 
Member#: 6551
Join Date: May 2001
Chapter/Region: MWSOC
Location: Carol Stream, IL
Vehicle:
'01 GC8 Dinged STM
'09 Concours 14 ABS Black

Default

Quote:
Originally posted by DrBoy01
I'm going to re-ask my question:

Can anyone who has N20 and a 4EAT explain how they use it in their rides (ie. what RPM do you activate the system, how you shift, etc.)?
read what was posted before, turn it on at 3k and let the ECU shift cause if you hit the limiter on dry N20 shot you can kiss your pistons goodbye

Last edited by HndaTch627; 12-09-2002 at 03:39 AM.
HndaTch627 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
Question about daily use of AP V2 down_for_the_scooby AccessPort 7 08-18-2009 07:23 AM
Question about swapping used pads onto new rotors? sd 05 sti Brakes, Steering & Suspension 3 11-07-2007 04:42 PM
Serious question about drug use Sharkbait Off-Topic 67 03-21-2007 05:30 AM
Questions about a used STi ruski General Community 16 10-15-2005 01:20 AM
questions about buying used car and taxes setiawani Off-Topic 9 08-04-2003 07:34 PM


All times are GMT -4. The time now is 12:07 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.