Welcome to the North American Subaru Impreza Owners Club Monday July 14, 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 > Subaru Conversions

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 08-14-2012, 12:05 PM   #1
lgt2000
Scooby Newbie
 
Member#: 140073
Join Date: Feb 2007
Chapter/Region: South East
Location: NC
Vehicle:
2005 LGT
Red

Default 2005 Legacy GT V8 Build (LS2/LQ4)

I have been working on a few V8 build recently and have decided not to rebuild my legacy back to the 2.5L Turbo but to swap it out for a 6.0L V8.

We are building everything ourselves and are working on a V8 Miata at the same time.

The engine is going to be an Iron LS2 or LQ4 which will have headwork and cam done to produce around 450 rwhp. The transmission will be a T56 6-Speed.

The car will be RWD due to space constraints and will fit what I need it to do. I am going to run the GM ECU and interface it to the Legacy cluster.

The front accessories are from a C6 LS3 Corvette to save space.

If you want to see quicker progress buy my stuff haha )

Here are the specs on what I have so far:

2003 LQ4 6.0L Short block with dished pistons
2006 GTO Front Sump Oil Pan and Pickup
2010 Corvette Water Pump and Harmonic Balancer

The head will most likely be 243/799 LS2 heads but I may go to LS3 head depending on what kind of deals i find. Once the heads are bought I can decide what direction to go in as far as a cam

The heads will be milled in any case and the goal is to run around 11:1 compression and stay on 93 octane

The T56 will most likely be the CTS-V unit since it has a shifter setup similar to the Legacy and is improved over the F-Body units
This will send power through an LS7 Corvette clutch

Here is a picture of the first quick mockup we did once the mockup engine arrived. We are going to modify and reinforce the subframe to move the engine back another 3 inches and we are also going to use outback pieces in order to drop the subframe an inch lower

* Registered users of the site do not see these ads.
lgt2000 is offline   Reply With Quote
Old 08-14-2012, 12:05 PM   #2
lgt2000
Scooby Newbie
 
Member#: 140073
Join Date: Feb 2007
Chapter/Region: South East
Location: NC
Vehicle:
2005 LGT
Red

Default

Here are few more pics we took when we were doing the initial quick mockup. This is without squaring off and center the engine and before the subframe modification and Outback subframe drop. Once all those modification are completed and the hood is swapped for a scoopless one we hope to be able to make everything clear under there.

That motor mount bracket in the middle of the firewall is now drilled out and the area patched as it was in the way




Last edited by lgt2000; 08-14-2012 at 12:10 PM.
lgt2000 is offline   Reply With Quote
Old 08-14-2012, 12:06 PM   #3
lgt2000
Scooby Newbie
 
Member#: 140073
Join Date: Feb 2007
Chapter/Region: South East
Location: NC
Vehicle:
2005 LGT
Red

Default

Reservedb
lgt2000 is offline   Reply With Quote
Old 08-14-2012, 12:39 PM   #4
EvileyeZ88
Scooby Specialist
 
Member#: 233501
Join Date: Dec 2009
Chapter/Region: MAIC
Location: Fairfax Va
Vehicle:
07AD 337/335SAXWAGON
99 outback sport

Default

Sweet raptor Jesus this looks like it'll be some fun
EvileyeZ88 is offline   Reply With Quote
Old 08-14-2012, 01:58 PM   #5
STi Addict
Scooby Newbie
 
Member#: 328431
Join Date: Aug 2012
Location: Ontario
Vehicle:
09 STi madness
DGM

Default

woahhhhhhhh O.O
STi Addict is offline   Reply With Quote
Old 08-16-2012, 05:03 PM   #6
DeleriousZ
Scooby Newbie
 
Member#: 323869
Join Date: Jun 2012
Chapter/Region: W. Canada
Location: Calgary, AB
Vehicle:
2000 ST-outback
White/Grey

Default

Was about to ask why you weren't moving the engine down and back. Then I read your post instead of looking at pictures lol. Interesting project!
DeleriousZ is offline   Reply With Quote
Old 08-20-2012, 03:18 AM   #7
climberd
Scooby Newbie
 
Member#: 183019
Join Date: Jun 2008
Chapter/Region: TXIC
Location: Dallas, TX
Vehicle:
05 LGT Stg3 Wgn
Black

Default

Subscribed, mostly interested in your wiring choices to get the LGT ECU to play nice and not freak out with cam sensor missing.
climberd is offline   Reply With Quote
Old 08-21-2012, 01:18 AM   #8
Skrane
Scooby Newbie
 
Member#: 296352
Join Date: Sep 2011
Default

Why iron block?
Skrane is offline   Reply With Quote
Old 08-21-2012, 01:40 AM   #9
RallySport Direct
NASIOC Storefront Vendor
 
Member#: 33174
Join Date: Feb 2003
Chapter/Region: RMIC
Location: Salt Lake City Utah
Vehicle:
We are Open Late!
888-457-2559 Every day!

Default

And so it begins...


This is awesome, I will keep checking back for updates, and can't wait to see this thing up and running! Good luck with the build!!

Thanks,
Rick
RallySport Direct is offline   Reply With Quote
Old 08-21-2012, 06:52 AM   #10
Patrick Olsen
NASIOC Supporter
 
Member#: 120
Join Date: Jul 1999
Chapter/Region: AKIC
Location: Where the Navy sends me...
Vehicle:
1997 Legacy 2.5GT
QuickSilver Metallic

Default

Quote:
Originally Posted by Skrane View Post
Why iron block?
I was wondering the same thing. I understand the iron block would be cheaper, but it shouldn't be that hard to find an aluminum engine, and the weight savings on the nose is more than worth it IMO. The aluminum 5.3L engines (LM4) can be had for $500-800 complete, for instance, and will make tons of power just like the other LS motors.
Patrick Olsen is online now   Reply With Quote
Old 08-21-2012, 11:33 AM   #11
KONKILR
Scooby Specialist
 
Member#: 3190
Join Date: Dec 2000
Chapter/Region: MAIC
Location: Flintstone,md.
Vehicle:
2004 Impreza TS and
the Suxass racing mobile!

Default

If he plans to turbo it the iron block will hold more power, but is it really needed?

jake
KONKILR is offline   Reply With Quote
Old 08-21-2012, 11:53 AM   #12
Skrane
Scooby Newbie
 
Member#: 296352
Join Date: Sep 2011
Default

Quote:
Originally Posted by KONKILR
If he plans to turbo it the iron block will hold more power, but is it really needed?

jake
Why would the iron block hold more power
Skrane is offline   Reply With Quote
Old 08-21-2012, 12:28 PM   #13
Steve.804
Scooby Specialist
 
Member#: 68647
Join Date: Aug 2004
Chapter/Region: MAIC
Location: Richmond, VA
Vehicle:
07 STI
Rotated 35R Jorge Tuned

Default

Quote:
Originally Posted by KONKILR View Post
If he plans to turbo it the iron block will hold more power, but is it really needed?

jake
^the turbo? yes, yes it is.

Can't wait to see this through its build process!

Quote:
Originally Posted by Skrane View Post
Why would the iron block hold more power
Less flexing in the sidewalls.
Steve.804 is offline   Reply With Quote
Old 08-21-2012, 12:38 PM   #14
Skrane
Scooby Newbie
 
Member#: 296352
Join Date: Sep 2011
Default

Not enough to justify having an iron block. Unless he got a great deal on it or something haha
Skrane is offline   Reply With Quote
Old 08-21-2012, 12:54 PM   #15
KONKILR
Scooby Specialist
 
Member#: 3190
Join Date: Dec 2000
Chapter/Region: MAIC
Location: Flintstone,md.
Vehicle:
2004 Impreza TS and
the Suxass racing mobile!

Default

The iron block LS engines are way stronger than the aluminum block. Plus you can safely overbore the iron block. And the iron block engines are ready to spin to the moon and boost like crazy with no issues.

jake
KONKILR is offline   Reply With Quote
Old 08-21-2012, 01:00 PM   #16
Turn in Concepts
NASIOC Vendor
 
Member#: 93646
Join Date: Aug 2005
Chapter/Region: MWSOC
Vehicle:
Many Track Records
Let us help you go fast!

Default

At this point I really don't care if he does aluminum, iron or purple monkey dung. I just want to see it happen.
Turn in Concepts is online now   Reply With Quote
Old 08-21-2012, 01:20 PM   #17
GT35RHybrid
Scooby Newbie
 
Member#: 223237
Join Date: Sep 2009
Chapter/Region: South East
Default

Holy smokes in for updates.
GT35RHybrid is offline   Reply With Quote
Old 08-21-2012, 05:38 PM   #18
kaos200
Scooby Guru
 
Member#: 2692
Join Date: Oct 2000
Chapter/Region: SCIC
Location: SoCal
Default

I dare not mention nor view this thread anywhere near my GT for she will feel inadequate
kaos200 is online now   Reply With Quote
Old 08-21-2012, 05:49 PM   #19
KONKILR
Scooby Specialist
 
Member#: 3190
Join Date: Dec 2000
Chapter/Region: MAIC
Location: Flintstone,md.
Vehicle:
2004 Impreza TS and
the Suxass racing mobile!

Default

Unfortunately I need my subaru to be AWD, otherwise my newly acquired LGT might get this treatment!

jake
KONKILR is offline   Reply With Quote
Old 08-21-2012, 06:41 PM   #20
Jaxx
NASIOC Supporter
 
Member#: 177
Join Date: Aug 1999
Chapter/Region: NWIC
Location: Boise,Idaho,USA
Vehicle:
The 93 Imp W/EJ20K
flat black

Default

not to pee in your coolaid but

"I am going to run the GM ECU and interface it to the CAN BUS Legacy cluster."

thats going to be tough
Jaxx is online now   Reply With Quote
Old 08-21-2012, 09:59 PM   #21
RallyColtTurbo
Scooby Specialist
 
Member#: 16819
Join Date: Mar 2002
Chapter/Region: SCIC
Location: Lake Elsinore, CA
Vehicle:
2002 MBP WRX,'06 LR3
Three Gen 1 Legacy Turbos

Default

Quote:
Originally Posted by Jaxx View Post
not to pee in your coolaid but

"I am going to run the GM ECU and interface it to the CAN BUS Legacy cluster."

thats going to be tough
I'm not so sure. The CANBUS interface is an industry standard, so the communication should 'just work' with a bit of research. After that you need the commands to do as intended.

A person with the right skill set can sniff the CANBUS of both to figure out what each command does for each brand. Then said skilled person can build a 'translator' that accepts the GM ECU commands and repeats out the Subaru translation for the cars systems.

It's far beyond my skillset, but the type of guys that can reverse engineer complete ECUs should have a head start. The question is....does the builder have the know-how or the connections?
RallyColtTurbo is offline   Reply With Quote
Old 08-21-2012, 10:09 PM   #22
Psychoreo
Scooby Guru
 
Member#: 79643
Join Date: Jan 2005
Chapter/Region: NESIC
Location: New Britain
Vehicle:
2015 WRX STI
Terminal black pearl

Default

Quote:
Originally Posted by Turn in Concepts
At this point I really don't care if he does aluminum, iron or purple monkey dung. I just want to see it happen.
^this
Psychoreo is online now   Reply With Quote
Old 08-22-2012, 12:24 AM   #23
RallySport Direct
NASIOC Storefront Vendor
 
Member#: 33174
Join Date: Feb 2003
Chapter/Region: RMIC
Location: Salt Lake City Utah
Vehicle:
We are Open Late!
888-457-2559 Every day!

Default

Quote:
Originally Posted by Turn in Concepts View Post
At this point I really don't care if he does aluminum, iron or purple monkey dung. I just want to see it happen.

LOL best quote I have seen in a long time. Thanks for that, I needed it tonight haha!

Rick
RallySport Direct is offline   Reply With Quote
Old 08-22-2012, 07:55 AM   #24
GT35RHybrid
Scooby Newbie
 
Member#: 223237
Join Date: Sep 2009
Chapter/Region: South East
Default

Is it just me or does it look like there is gonna be some fitment issues at the front?
GT35RHybrid is offline   Reply With Quote
Old 08-27-2012, 12:41 AM   #25
climberd
Scooby Newbie
 
Member#: 183019
Join Date: Jun 2008
Chapter/Region: TXIC
Location: Dallas, TX
Vehicle:
05 LGT Stg3 Wgn
Black

Default

There is plenty of room. The problem is going to be getting the GM ECU to talk to the Subaru ECU. It's possible, sure. Yet that solution posted above is by far the hardest thing I can think of to make for a Subaru, or for any modified car project. Back to reality, the only "good" solution I have found to this problem (and I have put very serious research into this) is to do the simple old cam trigger and crank trigger wheel/sensor faking. Feed the Subaru ECU just enough so it will a) crank the starter, and b) not throw a CEL code. The cam trigger is the key. You can clear away any other code, but you're not going anywhere without a cam signal unless you completely bypass every Subaru ECU function. Let's say you do that, no Subaru ECU outputs except CAN, no inputs except GM ECU's tach output (which has a different logic of trigger wheel shape)... you would have to find a way to get the cluster to come alive. Any way you cut it, short of hiring a software/hardware engineer, you may be best off just adding a crank trigger and cam trigger wheel in the Subaru format. If anyone has a plan that would work better, I would love to hear it.
climberd 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


All times are GMT -4. The time now is 10:53 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.