N/A interest and 3" turbo exhaust GB HOMEWORK !
Posted: Fri Nov 30, 2001 12:41 am
In a message dated 11/29/01 03:285 AM Pacific Standard Time,
Date: Wed, 28 Nov 2001 108:52 -0800 (PST)
From: Grant Hughes <grantsubaru@yahoo.com>
Subject: Re: 3" exhaust GB & Subspeed Website
Would this exhaust system be compatible with a 92 not-turbo Legacy?
Grant
I gave what I thought was a good answer, duplicated here;
Hi Grant,
An exhaust fabricated for a turbo engine requires what is called a downpipe from the turbo outlet and usually looks kind of like a long letter "S". An exhaust fabricated for the normally aspirated engine would have a different pipe directly off the engine exhaust manifold. However, one of our 12 candidates also has a normally aspirated engine, and the difference in fab may be so minimal that Subspeed will work with you. We can make it part of our GB FAQ's to/from Subspeed.
Larry Witherspoon
I copied Russ Kappelman at Subspeed and received a detailed explanation along with a request for information from the GB participants, duplicated below;
Larry:
The way it all works out is like this:
On the original equipment exhaust systems FOR THE EA82 SERIES OF CARS the center pipe and the rear muffler section are the same on both the normally aspirated cars and the turbo cars. The outlet of the 'Y' pipe on an NA car comes out to the exact location in 3 dimensional space as the outlet of the downpipe on the turbo cars. This was done so that Subaru could save money and use the same set of pipes for all of the EA82 cars including the ER27 XT6 (I have one of these as well).
It would help me tremendously if your group could determine if Subaru did the same thing with the Legacy series as they did with the Loyale series. I speculate that they did but I have no easy way of knowing since the only Legacy I have is turbocharged. If they did then it MAY be possible to accommodate the NA Legacy owners. The reason I say MAY is I do not know what issues exist with pipe size and flange bolt patterns.
As of this writing I am trying to digitize the downpipe inlet flange into AutoCAD so that I can produce these units. As for the outlet flange the catalogs that I have for universal flanges only show up to 2.5 inch for a two bolt flange. 3 inch flanges have three bolt holes. I do not want a 3 bolt flange for the downpipe outlet because I want to use the same style of interface between the downpipe outlet and center pipe inlet as the factory which is a 2 hole spring bolt cone shaped composite gasket system. I am able to duplicate this in the 2.5 inch size for the Loyale series of products but am unsure at this point if it will be possible to do it in the 3 inch for the Legacy. If these flanges are just simply not available then I will have to make them (I'd much rather buy them) but then there is the issue of an appropriate gasket which I have no idea at this point is it even exists.
As you can see development of a series of products that are cross compatible is a rather complex task. Let me know what you are able to
determine and I will do what ever is possible to make this happen.
Regards,
Russ
So anybody out there by any chance have the answer to that one?
Does the 91- 94 N/A Legacy 'Y' pipe terminate at the same place the turbo downpipe outlet does?
If the center pipe and the rear muffler section are the same on both the normally aspirated and the Turbo Legacys, like in the Loyal series, that would be a good clue. Maybe somebody has access to part numbers, though I think the Turbo Legacy muffler is different.
Larry Witherspoon
92 Touring Wagon
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Date: Wed, 28 Nov 2001 108:52 -0800 (PST)
From: Grant Hughes <grantsubaru@yahoo.com>
Subject: Re: 3" exhaust GB & Subspeed Website
Would this exhaust system be compatible with a 92 not-turbo Legacy?
Grant
I gave what I thought was a good answer, duplicated here;
Hi Grant,
An exhaust fabricated for a turbo engine requires what is called a downpipe from the turbo outlet and usually looks kind of like a long letter "S". An exhaust fabricated for the normally aspirated engine would have a different pipe directly off the engine exhaust manifold. However, one of our 12 candidates also has a normally aspirated engine, and the difference in fab may be so minimal that Subspeed will work with you. We can make it part of our GB FAQ's to/from Subspeed.
Larry Witherspoon
I copied Russ Kappelman at Subspeed and received a detailed explanation along with a request for information from the GB participants, duplicated below;
Larry:
The way it all works out is like this:
On the original equipment exhaust systems FOR THE EA82 SERIES OF CARS the center pipe and the rear muffler section are the same on both the normally aspirated cars and the turbo cars. The outlet of the 'Y' pipe on an NA car comes out to the exact location in 3 dimensional space as the outlet of the downpipe on the turbo cars. This was done so that Subaru could save money and use the same set of pipes for all of the EA82 cars including the ER27 XT6 (I have one of these as well).
It would help me tremendously if your group could determine if Subaru did the same thing with the Legacy series as they did with the Loyale series. I speculate that they did but I have no easy way of knowing since the only Legacy I have is turbocharged. If they did then it MAY be possible to accommodate the NA Legacy owners. The reason I say MAY is I do not know what issues exist with pipe size and flange bolt patterns.
As of this writing I am trying to digitize the downpipe inlet flange into AutoCAD so that I can produce these units. As for the outlet flange the catalogs that I have for universal flanges only show up to 2.5 inch for a two bolt flange. 3 inch flanges have three bolt holes. I do not want a 3 bolt flange for the downpipe outlet because I want to use the same style of interface between the downpipe outlet and center pipe inlet as the factory which is a 2 hole spring bolt cone shaped composite gasket system. I am able to duplicate this in the 2.5 inch size for the Loyale series of products but am unsure at this point if it will be possible to do it in the 3 inch for the Legacy. If these flanges are just simply not available then I will have to make them (I'd much rather buy them) but then there is the issue of an appropriate gasket which I have no idea at this point is it even exists.
As you can see development of a series of products that are cross compatible is a rather complex task. Let me know what you are able to
determine and I will do what ever is possible to make this happen.
Regards,
Russ
So anybody out there by any chance have the answer to that one?
Does the 91- 94 N/A Legacy 'Y' pipe terminate at the same place the turbo downpipe outlet does?
If the center pipe and the rear muffler section are the same on both the normally aspirated and the Turbo Legacys, like in the Loyal series, that would be a good clue. Maybe somebody has access to part numbers, though I think the Turbo Legacy muffler is different.
Larry Witherspoon
92 Touring Wagon
ADVERTISEMENT
<http://rd.yahoo.com/M=178320.1681224.32 ... /yahoo-75f>
<http://us.adserver.yahoo.com/l?M=178320 ... =233648241>
To unsubscribe from this group, please send an email to:
BC-BFLegacyWorks-unsubscribe@egroups.com
zZz <http://docs.yahoo.com/info/terms/> .