Welcome to the North American Subaru Impreza Owners Club Wednesday July 23, 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 Subaru Models > Legacy Forum

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 07-21-2000, 05:14 PM   #1
Shik
NASIOC Supporter
 
Member#: 132
Join Date: Jul 1999
Chapter/Region: Tri-State
Location: Central PA
Vehicle:
1997 LGT wagon
2015 WRX on order

Post Boost cut... How does it work?

OK guys, I'm a bit stumped. Today while travling up a large hill I decided to see what my max boost was at since it was very cool and crisp outside. To my surprise, I got 12psi with no hint of boost cut.

Now, I know how the ECU finds out how much boost is actually being made( via the map sensor), but how does the ECU ~supposedly~ kill the boost? I know many years ago on my old RX Turbo sedan, the ECU cut the spark when the boost got to high, which in turn, made you feel like you were hitting a brick wall. However, I know on some cars, the ECU simply opens the factory boost solenoid all the way, resulting in a sudden loss of power, until boost comes back down to a normal level. If this is the case with the Legacys, I can see why I have not hit boost cut yet because my boost solenoid is disabled( since I have the Hallman boost controller). Or, maybe I just have to go higher with the boost until it kicks in( don't worry, I'm not)? Any help is appreciated.
* Registered users of the site do not see these ads.
Shik is online now   Reply With Quote
Old 07-22-2000, 06:39 AM   #2
Jay_UK
Scooby Specialist
 
Member#: 296
Join Date: Sep 1999
Location: Derby, Derbyshire, England
Post

Its the brick wall method... lol

Believe me... you will know...

J.
Jay_UK is offline   Reply With Quote
Old 07-22-2000, 08:29 AM   #3
PeteH
Scooby Newbie
 
Member#: 431
Join Date: Oct 1999
Location: Baraboo WI, USA
Wink

I think you need to keep upping the boost until you hit the limiter, we just gotta know

How do you like the Hallman? Does it list any specs about orifice size and such? Would be nice to find a less expensive alternative.
PeteH is offline   Reply With Quote
Old 07-23-2000, 04:26 AM   #4
Shik
NASIOC Supporter
 
Member#: 132
Join Date: Jul 1999
Chapter/Region: Tri-State
Location: Central PA
Vehicle:
1997 LGT wagon
2015 WRX on order

Post

I suppose I just have to go higher then

Pete, I think for the money, ease of installation(5 minutes if that), and the performance of it, the Hallman is fantastic. but if you want to go the "home-made" route, check out this site... http://pages.cthome.net/gus/mike.html

It looks like it works very similar to the Hallman. Should be quite inexpensive. As soon as I get the fuel computer in, I'm going to up the boost a bit and use the Subaru Select Monitor to monitor O2 voltage so hopefully I may be able to give the turbo Legacy guys somewhere to start as far as how much fuel has to be added if any.

Currently though, my Mitsubishi Galant VR4 is taking up most of my time getting it back to good health.

[This message has been edited by Shik (edited July 23, 2000).]
Shik is online now   Reply With Quote
Old 07-23-2000, 05:13 PM   #5
PeteH
Scooby Newbie
 
Member#: 431
Join Date: Oct 1999
Location: Baraboo WI, USA
Talking

WooHoo! Thanks for the link Shik! Now I need to do some homework to determine exactly where it needs to be located.

What is wrong with the VR4, tranny problems perhaps?
PeteH is offline   Reply With Quote
Old 07-23-2000, 09:07 PM   #6
Shik
NASIOC Supporter
 
Member#: 132
Join Date: Jul 1999
Chapter/Region: Tri-State
Location: Central PA
Vehicle:
1997 LGT wagon
2015 WRX on order

Post

Pete, as far as where to locate the BC, it just goes anywhere inbetween the wastegate and a boost source( I use the map sensor line coming off of the right side intake runner). Make sure to disconnect the two boost lines from the factory boost solenoid, but leave the electrical connection for the solenoid plugged in or you will most likely get a check engine light.

As for the GVR4, no, thankfully it was a one owner by a "family man" so it saw no activity at a drag strip so the tranny is still in good shape. It is the universal problem of any Mitsubishi with original parts and high miles...mega boost or exhaust leak somewhere. I just got done yanking the manifold and checking both it and the exhaust housing on the turbo for cracks( both are only 15,000 miles old), and replacing the oil feed line since the meatballs at the Mitsu dealer didn't do it when they did the turbo so no use in taking chances. Many of the exaust manifold nuts and studs were practically finger tight so it would be nice if the exhaust problem was there but I'm not holding my breath. After that is put back together, it's off to get the T-Belt and all the other goodies in there replaced.

I got the car very cheap so I don't mind puting money into it and was totally expecting to do so. The car is fantastic other then the minor problems. When comparing it to the Legacy, it excells in some spots but falls behind in others. Needless to say I am happy to have both. They both just need a bit more boost at the moment

Let us know how you make out with the boost controller if you decide to go that route.
Shik is online now   Reply With Quote
Old 07-26-2000, 01:12 PM   #7
DLC
out back
Moderator
 
Member#: 1964
Join Date: Jul 2000
Chapter/Region: RMIC
Location: 84XXX
Vehicle:
01 BH
Blue/Bronze

Post

I myself am trying to talk someone out of his 91 Legacy Turbo...

Currently i have a 90 L+ and it's a great car, but the Turbo is where it's at.

My dilemma is that i also know someone with a Galant VR4 he'd sell for around $7k, whereas the Turbo might be closer to $4k with it's relatively high miles (160k).

I'm a Subaru die-hard so i'm leaning toward the Turbo, but the Galant is tempting...

I scanned in a comparison between these two cars from Motor Trend back in 91. It's really fascinating to see the good and bad points of both...

For those interested, just follow this link: http://www.xmission.com/~dac/articles/vs/vs_1.htm
DLC is offline   Reply With Quote
Old 07-26-2000, 04:53 PM   #8
Shik
NASIOC Supporter
 
Member#: 132
Join Date: Jul 1999
Chapter/Region: Tri-State
Location: Central PA
Vehicle:
1997 LGT wagon
2015 WRX on order

Post

DLC, yes that's an interesting article. I read it when Dave first put it on his site a while ago. So far, from what I discovered, if you are looking for all-out performance, the GVR4 is the way to go. I personally feel the motor is just easier to get power out of, plus there are SO MANY people tuning Mitsubishi's, just about anything that could be done, was done, so that is a help.

But the Legacy Turbo is just a fantastic all-around car. It seems to do not one thing perfect, but everything very well. And don't take my last statement about power wrong. You can get plenty of power out of the Subaru, it's just not as easy. If you are looking for a day-to-day car that is a blast to drive, very easy to work on, and super reliable, I'd have to give the nod to the Legacy.

Both cars put a smile on my face each and every time I drive them though. You really can't go wrong with either
Shik is online now   Reply With Quote
Old 07-26-2000, 05:00 PM   #9
DLC
out back
Moderator
 
Member#: 1964
Join Date: Jul 2000
Chapter/Region: RMIC
Location: 84XXX
Vehicle:
01 BH
Blue/Bronze

Post

Well i scanned that in a long time ago, i'm glad someone read it.

BTW, DLC = Dave's Legacy Central = I am that Dave

Where else can i get feedback from someone who has both cars!

This will be a daily driver so i see how it could be a bit better, both from your point of view and what the review says.

I've also weighted how easy it would be to tack on some Eclipse parts and get more HP out of it, but i guess it isn't as challenging, and there are a TON more DSM cars being modified than Subarus. I've always preferred being on the quirky side...

I guess that's why i own a Mac, and a Dual P3, and run Linux, and...
DLC is offline   Reply With Quote
Old 07-26-2000, 07:13 PM   #10
Shik
NASIOC Supporter
 
Member#: 132
Join Date: Jul 1999
Chapter/Region: Tri-State
Location: Central PA
Vehicle:
1997 LGT wagon
2015 WRX on order

Post

OK, I get it now You had an engine shot of my Legacy with the WRX intercooler on it on your site for a while. Car looks a bit different now.

You are right in saying that there are a ton more DSM cars being modified( which I'm assuming you mean the Legacy would be a bit more "unique"), but thankfully the Galnt VR4 is NOT a DSM car, and there are less GVR4s running around then there are Legacy Turbos(about 10,000 less). So you get the best of both worlds with the Galant, you get all the available DSM knowledge, without the DSM popularity.

For the price difference, I would go with the Legacy. However, if the Legacy is an auto, there would be no question which one to go for IMHO.
Shik is online now   Reply With Quote
Old 07-26-2000, 07:45 PM   #11
DLC
out back
Moderator
 
Member#: 1964
Join Date: Jul 2000
Chapter/Region: RMIC
Location: 84XXX
Vehicle:
01 BH
Blue/Bronze

Post

I might know you by a different name than Shik then

I'm curious as to how the Galant isn't a DSM. It's Mitsubishi, so how can it not be a "Diamond Star Motors" car?

One of 3000 would be neat, and more unique than a Legacy Turbo, but...how many Legacy Turbos were made? 15k?

The Turbo is a 5-speed, rest assured...
DLC is offline   Reply With Quote
Old 07-26-2000, 11:35 PM   #12
JC
NASIOC Supporter
 
Member#: 692
Join Date: Dec 1999
Chapter/Region: SCIC
Vehicle:
2006 Pontiac GTO M6
Triumph Street Triple R

Wink

Sorry to burst your bubble Shik, but Galant VR-4s ARE DSMs. Talons, Lasers, Eclipses, and Galant VR-4s.
JC is online now   Reply With Quote
Old 07-27-2000, 03:45 PM   #13
Shik
NASIOC Supporter
 
Member#: 132
Join Date: Jul 1999
Chapter/Region: Tri-State
Location: Central PA
Vehicle:
1997 LGT wagon
2015 WRX on order

Post

The Galant VR4 is a japanese model that was imported to the US, just like the Legacy. It is 100 percent Mitusbishi. Not the case with the DSM cars. The DSM cars are American bodys with Japanese drivetrains or visa versa. What was Chrysler's counterpart to the GVR4? There wasn't any because it was imported from Japan. You won't find many Eclipses in Japan because they were made and sold in America in a joint venture with Chrysler. Is a Mitusbishi Lancer a DSM car? No, because it is a Japanese model that was produced soley by Mitsubishi much in the same way as the GVR4s were, unfortunately the Lancers don't get imported, just as the GVR4s did,

Take a look at a TEL car's Vin plate. Everyone that I've every seen says it is a DSM car right on the plate. The only thing it says on a GVR4's plate is "Manufactured by Mitsubishi Motor Corp.". The DSM cars were not manufactured by Mitsubishi, how could they have been? The TEL cars took the engine and drivetrain from the Galant VR4s, not the other way around.

I don't mind having my bubble burst every now and again, and I very well could be wrong in this case, but I'd like some proof that I'm wrong( proof meaning how a GVR4 is intertwined with the DSM group, not "Well my friend said that they are", so I don't make the same mistake twice.


Dave, to answer your other questions, there was around 13,500 Turbo Legacys imported throughout 91-94, but as you know, the vast majority of them were autos( over 10,000 I believe), so in that respect, the 5spds are just as rare as the GVR4s. Again, for the price, I'd take the Legacy but that's me.

And you may remember me as Matt Scicchitano from way back. I remember you from the "Subaru Adventures" board before you even had the web site...I think.


[This message has been edited by Shik (edited July 27, 2000).]
Shik is online now   Reply With Quote
Old 07-27-2000, 03:59 PM   #14
richeich
Scooby Specialist
 
Member#: 1353
Join Date: Apr 2000
Vehicle:
2001 Impreza 2.5RS
Silver

Post

Yep, that's the way I always understood it. DSM was Chrysler and Mitsubishi's joint venture where they made the Eagle Talon, Mitsubishi Eclipse, and Chrysler/Plymouth Laser all at the same plant in (I think) Normal, IL.

Rich
richeich is offline   Reply With Quote
Old 07-27-2000, 09:56 PM   #15
DLC
out back
Moderator
 
Member#: 1964
Join Date: Jul 2000
Chapter/Region: RMIC
Location: 84XXX
Vehicle:
01 BH
Blue/Bronze

Post

Well i looked up your name and found out who you were, nice to see ya again.

I mailed you too, but you've not yet responded. Probably an address you don't check too often.

What ever happened to Subaru Adventures. It changed for a bit, came back as a retail thing and then disappeard...

I guess that does make the Turbo 5-speed just about as rare. Neat

[This message has been edited by DLC (edited July 27, 2000).]
DLC is offline   Reply With Quote
Old 07-27-2000, 11:11 PM   #16
JC
NASIOC Supporter
 
Member#: 692
Join Date: Dec 1999
Chapter/Region: SCIC
Vehicle:
2006 Pontiac GTO M6
Triumph Street Triple R

Post

Alright, I'm wrong. To my (current) understanding, 1st gen DSMs have Galant VR-4 drivetrains.
JC is online now   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
AVCS - How does it work? hatchy Factory 2.0L Turbo Powertrain 8 08-28-2011 09:39 PM
emotional pain, how does it work? WRX-78 Off-Topic 13 07-29-2003 11:36 PM
Turbo-back exhaust...how does it work? Silver_SportTrac Newbies & FAQs 7 02-24-2002 04:02 AM
intercooler...how does it work slapey Factory 2.0L Turbo Powertrain 5 06-12-2001 09:28 AM
RWI on Kumho 712.. how does it work? Prostho Brakes, Steering & Suspension 2 02-24-2001 08:11 PM


All times are GMT -4. The time now is 06:49 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.