Welcome to the North American Subaru Impreza Owners Club Wednesday February 22, 2017
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
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 11-18-2016, 11:53 AM   #1
tgbo
Scooby Newbie
 
Member#: 194492
Join Date: Nov 2008
Smile permanent auto awd to fwd for 914 conversion

Why do I want to permanently convert awd auto to fwd? The condition my condition is in requires an auto tranny -- my 75 model 914 has been running a 2001 Impreza 2.5 drivetrain for 6 years with a 5MT, rear drive locked out and I would like to keep the car--so I seek a permanent solution. Either an older rebuilt FWD auto if it will fit, or locking an AWD auto into permanent FWD without risking internal damage over time.

I am aware of the FWD fuse and the fussy threads about its use...I am open to all suggestions and real knowledge about this...It would be lovely if just capping the driveshaft to prevent leakage would work, but that sounds way too easy.

I have found some info on doing this, but much seemed anecdotal or not based on really understanding the transmission; I plan to drive this for years to come, so a solution that doesn't boil the transmission over time is important
* Registered users of the site do not see these ads.
tgbo is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 11-18-2016, 12:49 PM   #2
RallyColtTurbo
Scooby Specialist
 
Member#: 16819
Join Date: Mar 2002
Chapter/Region: SCIC
Location: Lake Elsinore, CA
Default

You can use any non-VTD Subaru 4 speed auto that bolts to your EJ-series motor. The non-VTD autos have the front wheels directly connected all the time. The rear wheels are simply clutched in and out when the transmission sees a difference in speed between the front and the rear. The FWD fuse is actually disabling the clutch - that's all it does.

You still need to integrate the TCU for shifting logic and to avoid a code for disabling the rear out put, but from a strictly mechanical standpoint all non-VTD 4EATS can be safely run with no rear output. Just gotta plug the huge oil leak out the back with no driveshaft.

You can get phase 1 FWD autos (and FWD ECUs) in certain pre-96 models of Impreza, Legacy and SVX. (The SVX ECU it tuned for 6 cylinders). However I have heard that phase 1 transmissions won't work with phase 2 electrics and you currently have a phase 2 motor and ECU. The phase 2 transmission can work as FWD just as well, but no phase 2 FWD TCUs came to North America. Maybe an overseas TCU can be sourced?

If I had a 914 I would find a FWD SVX and swap the whole drivetrain and harness complete.
RallyColtTurbo is offline   Reply With Quote
Old 11-18-2016, 09:52 PM   #3
tgbo
Scooby Newbie
 
Member#: 194492
Join Date: Nov 2008
Default re; 914 awd to fwd

Thanks for the input--you confirm what I have found about the auto trannys; as for an SVX drivetrain, I have a motor/transmission with only 10-11 k on them since new (someone else's oops with their Impreza) so swapping again makes no sense. Sounds like some wiring, a good used transmission and fabricating a cap to replace the driveshaft.
tgbo is offline   Reply With Quote
Old 12-17-2016, 11:21 PM   #4
motorbykemike
Scooby Specialist
 
Member#: 273868
Join Date: Feb 2011
Chapter/Region: MAIC
Default

then there's the whole thing about flipping the engine/trans backwards to work in a Porsche and how to make the trans turn the tires in the correct direction . ...........
motorbykemike is offline   Reply With Quote
Old 12-25-2016, 11:13 AM   #5
v2rocket_aka944
Scooby Newbie
 
Member#: 408701
Join Date: Dec 2014
Default

^^914 is a mid-engine with the engine/trans oriented the same way as they are in the subaru.

you're thinking 911.
v2rocket_aka944 is offline   Reply With Quote
Old 12-25-2016, 01:56 PM   #6
motorbykemike
Scooby Specialist
 
Member#: 273868
Join Date: Feb 2011
Chapter/Region: MAIC
Default

you're right
motorbykemike is offline   Reply With Quote
Old 12-25-2016, 01:57 PM   #7
motorbykemike
Scooby Specialist
 
Member#: 273868
Join Date: Feb 2011
Chapter/Region: MAIC
Default

am wondering if the auto trans can be run in rear engine though

thinking h6 vanagon
motorbykemike 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 02:07 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2017 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.