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Thread: Derek's Project GFP

  1. #106
    Join Date
    Jan 2010
    Location
    Bossier City, LA
    Posts
    2,229
    Look at your 89 tach; I don't think it HAS the CYL pin.

    But for 1991+ tachs, not in SCs, yes, you ground the CYL pin.

    What you might need to do, to keep the SC tach, is pickup a tach adapter, like this one (note: picked as a representative part, is NOT a recommendation for this unit!): http://www.allzim.com/store/tach-ada...e-adapter.html

    RwP

  2. #107
    Join Date
    Sep 2012
    Location
    Raleigh, North Carolina
    Posts
    671
    Quote Originally Posted by RalphP View Post
    Look at your 89 tach; I don't think it HAS the CYL pin.

    But for 1991+ tachs, not in SCs, yes, you ground the CYL pin.

    What you might need to do, to keep the SC tach, is pickup a tach adapter, like this one (note: picked as a representative part, is NOT a recommendation for this unit!): http://www.allzim.com/store/tach-ada...e-adapter.html

    RwP
    I already have this 92 lx tach. I just wanted to verify that if I tied the two pins I had circled, that it would make it an 8 cylinder tach.
    Any idiot can make a Mustang fast...
    It takes a special idiot to make a Thunderbird fast!!!
    89 SC 4.3 stroker 384rwhp 473ftlbs
    Best ET 13.085 Best MPH 106.6... got some work to do!
    2016 V6 M90 Dyno Champ 2016 Mod 1 Runner Up

  3. #108
    Join Date
    Sep 2012
    Location
    Raleigh, North Carolina
    Posts
    671
    Swapped out the tach out in the cluster tonight and took some pictures. I removed the original tach from the cluster and compared it to the new tach from a v6-v8 lx bird. Right away you can see the difference... the v6 v8 tach has an extra pin labeled CYL. My understanding is that you ground this pin to make the tach work in v8 mode. The 89 SC cluster has no connection for this pin, so you just ground the pin with a jumper on the back of the board. I trimmed the CYL pin down to make sure it didnt interfere (not sure if that is required or not, but I did it anyways). I also took a few minutes to swap the gauge face and the needle over. My needle was in better shape and the SC gauge face says Premium Unleaded Fuel Only instead of the v6-v8 tach that says Unleaded Fuel Only.

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    Ive got some work to do before I can start the car again and test it out to see if it works. But from what Ive read and now seeing the difference, it all makes sense.
    Any idiot can make a Mustang fast...
    It takes a special idiot to make a Thunderbird fast!!!
    89 SC 4.3 stroker 384rwhp 473ftlbs
    Best ET 13.085 Best MPH 106.6... got some work to do!
    2016 V6 M90 Dyno Champ 2016 Mod 1 Runner Up

  4. #109
    Join Date
    Apr 2002
    Location
    Greenville, IN
    Posts
    4,338
    Do you have the EVTM? Should be able to tell for sure and easily if grounding the pin is all that's needed with it.
    Matt Haub
    Shootouts: '09 SS 1st | '10 Mod1 2nd | '11 Bracket 3rd | '12 Bracket 1st | 2013 | '14 Bracket 3rd | 2015 | '16 Bracket 1st & Mod2 2nd | 2017 |
    Black '89 5spd - 281K miles, MPx, E85, Alky-Inj ¶ RWHP: ? RWTQ: ? ¶ Best 1/4mi:12.521, MPH:107.23mph
    35th Anniversary Auto 46k miles | Red '93 Auto 186k miles
    My Garage

  5. #110
    Join Date
    Sep 2012
    Location
    Raleigh, North Carolina
    Posts
    671
    Quote Originally Posted by DrFishbone View Post
    Do you have the EVTM? Should be able to tell for sure and easily if grounding the pin is all that's needed with it.
    Correction, it appears that the 92 EVTM shows that the "sport cluster" shows a circuit 875 coming from the tach going to ground. on that circuit there is a note that says "5.0L Engine Only". The performance cluster does not have this, and the electronic cluster is so complicated, i didnt look that close.

    I thought the EEC told the tach what engine was in the car, but I guess im wrong. It appears that its the harness.
    Last edited by dthompson; 08-15-2018 at 06:12 PM.
    Any idiot can make a Mustang fast...
    It takes a special idiot to make a Thunderbird fast!!!
    89 SC 4.3 stroker 384rwhp 473ftlbs
    Best ET 13.085 Best MPH 106.6... got some work to do!
    2016 V6 M90 Dyno Champ 2016 Mod 1 Runner Up

  6. #111
    Join Date
    Sep 2012
    Location
    Raleigh, North Carolina
    Posts
    671
    Down pipe is made! Its a tight fit... 3" off the turbine housing, immediately transitioned to 3.5". Its tight enough that I have to take the exhaust manifold off in order to install it. I massaged a couple places to improve clearances, but nothing major. Apparently I had ordered an extra wide band bung a long time ago... cause i found one in the tool box! Its a long one that keeps the sensor out of the direct stream.

    I wish I would have bought mild steel u bends instead of this aluminized stuff. it really is a pain to grind off the coating. You can see the crap you miss floating up as you weld. I also added a brace to the bottom of the down pipe coming off the bottom of the bell housing. I still need to decide if im going to plumb the WG back into the down pipe. Once everything is all finished up, I will wrap it in heat wrap.

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    Any idiot can make a Mustang fast...
    It takes a special idiot to make a Thunderbird fast!!!
    89 SC 4.3 stroker 384rwhp 473ftlbs
    Best ET 13.085 Best MPH 106.6... got some work to do!
    2016 V6 M90 Dyno Champ 2016 Mod 1 Runner Up

  7. #112
    Join Date
    Sep 2012
    Location
    Raleigh, North Carolina
    Posts
    671
    I decided to break the remaining exhaust into two pieces to make life a little easier. Its made so that a resonator can be added if needed in the future. I had intended on documenting the fuel line upgrade, but you can pretty much see what is going on with that in the second picture.

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    Any idiot can make a Mustang fast...
    It takes a special idiot to make a Thunderbird fast!!!
    89 SC 4.3 stroker 384rwhp 473ftlbs
    Best ET 13.085 Best MPH 106.6... got some work to do!
    2016 V6 M90 Dyno Champ 2016 Mod 1 Runner Up

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