505 STI to 505 GTI engine swap
  • Register
  • Help
Results 1 to 9 of 9
  1. #1
    Tadpole
    Join Date
    Nov 2004
    Location
    Adelaide
    Posts
    22

    Default 505 STI to 505 GTI engine swap

    Hello Froggers,
    I'm Looking for some tips on an intended engine swap.
    I have a 1984 505 STI manual with a dead motor and have aquired a 1985 505 GTI automatic with a good motor and rotten body. Am I likely to encounter any difficulties such as;

    Advertisement


    a) Adding the GTI computer to the STI?

    b) Connecting the GTI motor to the STI 5 Speed, e.g. splines on input shaft, bellhousing?

    c) Anything I haven't thought of?

    Any advice would be appreciated.

    Thanks

    Paris

  2. #2
    Demannu-facturing! Demannu's Avatar
    Join Date
    Dec 2002
    Location
    Menzies Creek
    Posts
    2,541

    Default

    It will be pretty straightforward, I've done this swap before.

    Being similar year cars, the wiring plugs for the engine will be fairly straightforward, I think I had to relocate and rewire the ignition relay to provide power to the ECU. The studs to bolt the ECU behind the glovebox are already there, and the holes in the firewall for the loom are already cut. You don't need to change the fuel pump.

    If you're happy enough with the STi system, all of the injection gear on the STi is completely compatible with the GTi motor, you could just change the 'core' over and be done with it.
    Scotty

    Melbourne - Dandenong Ranges

    1956 Peugeot 403 - 'Francois' - resto project

    1969 Peugeot 504 - 'Pascal' - daily driver project

    1970 Peugeot 404 Utility - 'Brutus' - resto project

    1978 Peugeot 604 - as yet unnamed - V6 on straight LPG

    1987 Peugeot 505 - as yet unnamed - project car

    1999 Peugeot 406 Coupé - 'Chloe' - 5 speed manual

    2011 Peugeot 3008 XTE HDi - 'Zoe' - hatchback on steroids

    2014 Peugeot RCZ - 'Remy'

    1999 Range Rover 4.6 HSE - 'Grover' - tow car

  3. #3
    VIP Sponsor
    Join Date
    Aug 2000
    Posts
    9,283

    Default

    Quote Originally Posted by Paris View Post
    Hello Froggers,
    I'm Looking for some tips on an intended engine swap.
    I have a 1984 505 STI manual with a dead motor and have aquired a 1985 505 GTI automatic with a good motor and rotten body. Am I likely to encounter any difficulties such as;

    a) Adding the GTI computer to the STI?

    b) Connecting the GTI motor to the STI 5 Speed, e.g. splines on input shaft, bellhousing?

    c) Anything I haven't thought of?

    Any advice would be appreciated.

    Thanks

    Paris
    You will need to add a bearing in the back of the crankshaft for the gearbox input shaft.
    You will need to use a GTi engine wiring loom, may get complicated.
    I converted an STi to GTi but used aftermarket ECU so just added what I needed and left the STi loom in place.
    By the way the series 1 GTi ECU is under the dash pad!
    Graham

  4. #4
    Tadpole
    Join Date
    Nov 2004
    Location
    Adelaide
    Posts
    22

    Default

    Thanks for the tips. I want to change to GTI system because the STI system is already in bits and the GTI system is known to be working and seems simpler.

    Good tip about the bearing. Is that a plain bronze bearing? How hard is it to remove it from the old engine or do I have to get a new one? I assume the Crankshaft will already have the socket drilled?

  5. #5
    VIP Sponsor
    Join Date
    Aug 2000
    Posts
    9,283

    Default

    Quote Originally Posted by Paris View Post
    Thanks for the tips. I want to change to GTI system because the STI system is already in bits and the GTI system is known to be working and seems simpler.

    Good tip about the bearing. Is that a plain bronze bearing? How hard is it to remove it from the old engine or do I have to get a new one? I assume the Crankshaft will already have the socket drilled?
    It's a ball bearing, just buy a new one.
    Graham

  6. #6
    VIP Sponsor
    Join Date
    Aug 2000
    Posts
    9,283

    Default

    Quote Originally Posted by Demannu View Post
    It will be pretty straightforward, I've done this swap before.

    Being similar year cars, the wiring plugs for the engine will be fairly straightforward, I think I had to relocate and rewire the ignition relay to provide power to the ECU. The studs to bolt the ECU behind the glovebox are already there, and the holes in the firewall for the loom are already cut. You don't need to change the fuel pump.

    If you're happy enough with the STi system, all of the injection gear on the STi is completely compatible with the GTi motor, you could just change the 'core' over and be done with it.
    Thinking of a series 2?
    The series 1 ECU is under the dash pad.
    Graham

  7. #7
    Demannu-facturing! Demannu's Avatar
    Join Date
    Dec 2002
    Location
    Menzies Creek
    Posts
    2,541

    Default

    Quote Originally Posted by GRAHAM WALLIS View Post
    Thinking of a series 2?
    The series 1 ECU is under the dash pad.
    Graham
    Ahh, good point. Yes, there's a 'clamp' thing under the dash pad to hold it up there. Not sure if that will be fitted already to the STi.

    Spigot bearing size 40mm OD x 17mm ID x 12mm thick. Get a sealed bearing. You can get them from CBC for about $8 (last time I got one).
    Scotty

    Melbourne - Dandenong Ranges

    1956 Peugeot 403 - 'Francois' - resto project

    1969 Peugeot 504 - 'Pascal' - daily driver project

    1970 Peugeot 404 Utility - 'Brutus' - resto project

    1978 Peugeot 604 - as yet unnamed - V6 on straight LPG

    1987 Peugeot 505 - as yet unnamed - project car

    1999 Peugeot 406 Coupé - 'Chloe' - 5 speed manual

    2011 Peugeot 3008 XTE HDi - 'Zoe' - hatchback on steroids

    2014 Peugeot RCZ - 'Remy'

    1999 Range Rover 4.6 HSE - 'Grover' - tow car

  8. #8
    pur-john, not pew-john! peujohn's Avatar
    Join Date
    Jul 2002
    Location
    Lilydale, Melbourne
    Posts
    2,095

    Default

    I removed the ECU from a series 1 GTI. I didn't have to remove the dashboard. I think the clamp stayed, I just took the ECU. Got to it from above the passenger footwell area.
    John W

    1979 Peugeot 504 GTI 2.2 litre 5 speed - 72 kW at the wheels

    1974 Peugeot 504 TI
    - now on the road

    2009 Peugeot 407 HDI wagon - family car

    Previous: 2005 407 HDI manual sedan, 1980 504 GL, 1990 405 Mi16, 1977 504 GL Special, 1984 505 SRD Turbo



  9. #9
    Demannu-facturing! Demannu's Avatar
    Join Date
    Dec 2002
    Location
    Menzies Creek
    Posts
    2,541

    Default

    Quote Originally Posted by peujohn View Post
    I removed the ECU from a series 1 GTI. I didn't have to remove the dashboard. I think the clamp stayed, I just took the ECU. Got to it from above the passenger footwell area.
    Yes, that's right, there's no need to remove the dashboard. It is clamped directly underneath the dash pad, but you access it from below. It is infinitely simpler if you remove the glovebox first, especially if you are taking the loom as well.

    The wiring loom runs from the ECU back across the firewall to a grommet in the passenger's side top corner of the firewall, except for one thick, green shielded wire that runs across to the dashboard for the tacho and a couple of short earthing leads. The grommet is big enough to cover a hole big enough to pull the entire ECU connector through.
    Scotty

    Melbourne - Dandenong Ranges

    1956 Peugeot 403 - 'Francois' - resto project

    1969 Peugeot 504 - 'Pascal' - daily driver project

    1970 Peugeot 404 Utility - 'Brutus' - resto project

    1978 Peugeot 604 - as yet unnamed - V6 on straight LPG

    1987 Peugeot 505 - as yet unnamed - project car

    1999 Peugeot 406 Coupé - 'Chloe' - 5 speed manual

    2011 Peugeot 3008 XTE HDi - 'Zoe' - hatchback on steroids

    2014 Peugeot RCZ - 'Remy'

    1999 Range Rover 4.6 HSE - 'Grover' - tow car

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •