Welcome to the North American Subaru Impreza Owners Club Tuesday July 29, 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 with bolt-on Forced Induction 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 10-02-2001, 03:32 PM   #1
impRSa01
Scooby Newbie
 
Member#: 4411
Join Date: Feb 2001
Location: Appleton, WI
Vehicle:
2001 Impreza 2.5 RS
Black

Default -To Intercool or Not to Intercool-

I am going with the Forced Air Technologies kit. Both stage 1 and stage 2 consist of the t3/04 turbo. I want to keep cost as low as possible.

If you are only going to run 5psi, is it worth the 750 for a top mount intercooler? Especially since the t3/04's don't run that hot at 5psi. I don't want detonation problems or my turbo to not last long. Many people say your turbo will go to sh_t if you dont have an intercooler, but I think that they mean turbo timer.

So, for the money, would you guys go with the stage 1 or stage 2 for a beginner kit? Also, would you go with a 2" or 2 1/4" up-pipe? I want the fastest spoolup, but not to lose high end because of smaller piping size. Thanks, Kevin

stage 1: $2950
stage 2: $3950
* Registered users of the site do not see these ads.
impRSa01 is offline   Reply With Quote
Old 10-02-2001, 03:37 PM   #2
SubaFastR
Scooby Specialist
 
Member#: 5786
Join Date: Apr 2001
Location: RS202
Default

Get the intercooler, although it won't effect the timer or the turbo. It will only save your block and add power. Ya, like those are bad reasons.
Kevin
SubaFastR is offline   Reply With Quote
Old 10-02-2001, 03:39 PM   #3
Keiho
Sea to Sky - OWNED
Moderator
 
Member#: 610
Join Date: Dec 1999
Chapter/Region: VIC
Location: Vancouver, BC, Canada
Vehicle:
2003 Lexus IS300
Graphite Gray Pearl

Default

Depends on if you can afford the intercooler and not scrimp on tuning the kit afterwards.

Yes an IC isn't really "needed" at 5psi, but it'll come in very handy on hot days and the oft chance of a bad tank of gas.
Keiho is offline   Reply With Quote
Old 10-02-2001, 03:59 PM   #4
Jon Bogert
Scooby Specialist
 
Member#: 1133
Join Date: Mar 2000
Location: SE PA
Vehicle:
09 GTR, 02 996 C4S
95 993 C4, 71 911, 04 STI

Default

At low boost, an air-air intercooler barely cools the charge at all--theoretically. In the real world it was the difference between running on pump gas with no pinging and, um, not running on pump gas with no pinging.
Jon Bogert is offline   Reply With Quote
Old 10-02-2001, 04:05 PM   #5
kastle
Frank Army
 
Member#: 1457
Join Date: May 2000
Chapter/Region: SWIC
Location: Phoenix, AZ
Vehicle:
1999 Outback Sport
Steel Blue Mica

Default

you must get an intercooler. it makes the kit soooo much better
kastle is offline   Reply With Quote
Old 10-02-2001, 04:12 PM   #6
AaronB
Worst Mod Ever
Moderator
 
Member#: 369
Join Date: Oct 1999
Chapter/Region: SWIC
Location: Phoenix, AZ
Vehicle:
12 Vagon

Default

I would ping on 92 octane in >80 degree temps without the IC. I wouldn't drive without one personally.

Aaron
http://www.AzScooby.com
http://www.ScoobyMods.com
AaronB is offline   Reply With Quote
Old 10-02-2001, 04:18 PM   #7
Rich L
Scooby Specialist
 
Member#: 961
Join Date: Feb 2000
Chapter/Region: Tri-State
Location: near Atco(NJ) 13.566@100.64-
Vehicle:
1999 RS-Tw/ CobraMAF
Custom Rallispec kit/IC#1

Lightbulb

Dont skimp out. Spend the money to make the motor safer.

You can spend anywhere between $400-$800 for an IC
or....
alot more for a new motor!

At lower boost (240hp or lower) 2.25" piping is perfect.
some ppl so no,
but I have it all the way through...
with good results.
Rich L is offline   Reply With Quote
Old 10-02-2001, 04:25 PM   #8
SubaFastR
Scooby Specialist
 
Member#: 5786
Join Date: Apr 2001
Location: RS202
Default

Ya know, I might be inclined to recommend real engine management over the intercooler. Tough choice.
kevin
SubaFastR is offline   Reply With Quote
Old 10-02-2001, 05:16 PM   #9
subachad
Scooby Specialist
 
Member#: 8488
Join Date: Jul 2001
Location: Sin City
Vehicle:
1993 Impreza GCStyle
Teal

Default

I say get a SAAB 900 Turbo intercooler for about $70 from a fellow I-Clubber (hint hint, ME) and use that as a temperary cooler. You'll see a HUGE drop in temps which equate to more power, and a better running setup.

You should also consider fuel options, even for 5psi such as an SFC, upgraded fuel pump and a RRFPR.

Chad
93 1.8T
subachad is offline   Reply With Quote
Old 10-02-2001, 10:51 PM   #10
MikeyG
Guest
 
Member#:
Default

I heard that for every degree you lower your intake temps, you lower your egt's by the same amount. An intercooler will help avoid pinging, increase power, lower egt's ( i think). The offsides to intercoolers is they lower your boost pressure by a few psi once it gets to the TB. and increase lag a little bit, but I do not belive it is noticeable...

I would suggest saving up for it. IMO I would not run a non-intercooled setup.

But I'm weird

MikeyG
  Reply With Quote
Old 10-03-2001, 12:08 AM   #11
LVSUBARU
Scooby Specialist
 
Member#: 4520
Join Date: Feb 2001
Location: LAS VEGAS
Vehicle:
93 STi V.4 RA
www.flat4lv.com

Default

Intercooler!!!!!!!
LVSUBARU is offline   Reply With Quote
Old 10-03-2001, 01:21 AM   #12
AZ-GT
NASIOC Supporter
 
Member#: 192
Join Date: Aug 1999
Chapter/Region: BAIC
Location: San Francisco, CA USA
Vehicle:
2011 WRX
WR Blue

Default

Intercooler is a must, especially in Arizona
AZ-GT is offline   Reply With Quote
Old 10-03-2001, 11:50 AM   #13
subachad
Scooby Specialist
 
Member#: 8488
Join Date: Jul 2001
Location: Sin City
Vehicle:
1993 Impreza GCStyle
Teal

Default

Mikey: how would an intercooler lower EGT's???

As for the pinging, detination by definition is an explosion happening in the cylinder without being ignited by the spark plug. This CAN be caused by high intake temperatures such as seen in a non intercooled compressed air type setup. So yes, an intercooler helps.

Pressure drops??? how so, the wastegate is not opening until it sees that predetermined set of boost so this won't even be noticeable, especially for a small intercooler like a top mount that you'll most likely be using.

Chad
93 1.8T
subachad is offline   Reply With Quote
Old 10-03-2001, 11:24 PM   #14
MikeyG
Guest
 
Member#:
Default

subachad:

I thought i read somewhere that egt are related to the intake temp. To me it kinda makes sense as if you start a thermal cycle with a lower initial temprature, it would make sence that you end up it a lower egt. Of course the delta between intake temp and egt would be about the same when intercooled or not. Of course if I am wrong i retract my statement.

Also from what I have read all intercoolers do lower psi of boost by the time it reaches the throttle body. I guess I just meant it would increase lag. When you hook up a boost sensor i assume it would be after the intercooler, possibly in the manifold. I ask for information here also please.

I have never installed a turbo system or even worked on an NA engine for repair reasons. All of the info that I have learned is from here and vishnu performance.

EDIT: I did a search for pressure drop and i have found multiple posts regarding it and intercoolers. here is a quote from one thread.
Quote:
There is a pressure drop across the intercooler just because of PV=nRT (you're lowering T a lot and hopefully keeping V the same so you have to increase n and/or decrease P to keep the equation satisfied
So i guess in the end if you want to combat the drop of pressure across the intercooler you have to make the turbo work harder.
  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
Time to poop. To flush or not to flush, that is the question sonic_boost_wagon Off-Topic 31 09-25-2010 12:45 PM
Going to track, to lip or not to lip jpmarotta Motorsports 3 09-19-2003 07:05 PM
Chance to buy mint ITR to buy or not to buy? WRC WRX Off-Topic 16 09-23-2002 12:24 PM
MY00-01 2.5RS or MY02 2.5RS, to buy or not to buy, that is the question Fujiwara General Community 7 04-24-2002 08:54 PM
('93-'01) (My mistake) To drift or not to drit? BHONE78 Impreza Forum 6 05-13-2001 01:08 PM


All times are GMT -4. The time now is 05:51 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.