»  BC-BF Legacy Discussion »  Drivetrain
#91 ss power mode

Custom Search
Login | Register




Post new topic Reply to topic  [ 5 posts ] 
Author Message
 Post subject: 91 ss power mode
PostPosted: Thu Apr 20, 2017 3:55 am 
First Gear
Joined: Wed Jan 01, 2014 7:04 pm
Posts: 100
Location: boise. id
So im wanting to do the power mode mod on my 1991 legacy ss. But i have read that I cant because the pin 4 goes to the cruse control. I'm wanting to know if i get a tcu from a 92-94 na legacy would my connectors fit into it? or would i need to get the whole wiring harness from said car to make it work.
or If some one has made the power mode mod to work on a 91 tcu please chime in/

_________________
1991 subaru legacy sport sedan


Profile  Offline
Reply with quote  
 Post subject: Re: 91 ss power mode
PostPosted: Thu Apr 20, 2017 5:49 pm 
Site Admin
Site Admin
Joined: Tue Oct 15, 2002 11:37 am
Posts: 27371
Location: Houston, Tx
From looking at the wiring diagrams it looks like that pin 4 to the cruise control is different and there's a pin B46 pin 15 that is on the 90-91 cars related to the speed sensor 2 and it's not there on the 92 wiring diagrams. In theory I think you could run the 92 TCU, however I'm not sure if the transmission would like the non-turbo TCU. You'd need to snip that wire at pin 4 so it doesn't interfere with the cruise (your cruise control may not work), and you'd probably want to look into whether your car has the pin for the speed sensor 2.

_________________
Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm


Profile  Offline
Reply with quote  
 Post subject: Re: 91 ss power mode
PostPosted: Sun Apr 23, 2017 11:42 pm 
First Gear
Joined: Wed Jan 01, 2014 7:04 pm
Posts: 100
Location: boise. id
Do you have the different diagrams for the 91 and 92-94 tcm that you could share?

_________________
1991 subaru legacy sport sedan


Profile  Offline
Reply with quote  
 Post subject: Re: 91 ss power mode
PostPosted: Mon Apr 24, 2017 5:50 pm 
Site Admin
Site Admin
Joined: Tue Oct 15, 2002 11:37 am
Posts: 27371
Location: Houston, Tx
These are from the 90 MY, but should be applicable to the 91. I'd have to double check when I get home.

http://main.experiencetherave.com/subar ... _page1.jpg
http://main.experiencetherave.com/subar ... _page2.jpg


Similarly I'll have to check the 92-94 when I get home.

_________________
Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm


Profile  Offline
Reply with quote  
 Post subject: Re: 91 ss power mode
PostPosted: Tue Apr 25, 2017 3:32 am 
Site Admin
Site Admin
Joined: Tue Oct 15, 2002 11:37 am
Posts: 27371
Location: Houston, Tx
The 90 & 91 TCU I/O is identical.

The only differences I saw was the 92-94 TCU I/O notes the atmospheric pressure sensor input is for non-turbo only.

The other thing I found was that the 90-91 TCU I/O has the brake switch labeled incorrectly. The 92-94 TCU I/O is correct and that's how the 90-91 is wired as well....the FSM is just wrong. You can check the individual wiring diagrams and they match vs. what the I/O lists.

So just use this scan

http://main.experiencetherave.com/subar ... CU_I-O.pdf

_________________
Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm


Profile  Offline
Reply with quote  

Display posts from previous:  Sort by  

Post new topic Reply to topic  [ 5 posts ] 


Who is online

Users browsing this forum: No registered users and 4 guests

Panel

Top You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
Search for:
Jump to:  

Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
Dizayn Ercan Koc