Bringing TBI and Multi Port Fuel Injection to a New Level.     EFI Conversions and Tuning! Seattle to Portland! E-mail Tuning Consultant!
Page 2 of 2 FirstFirst 12
Results 16 to 17 of 17

Thread: Gear change affecting VSS/MPH in 7747 ECM

  1. #16
    Join Date
    May 2011
    Lakes Region, NH
    Quote Originally Posted by PlayingWithTBI View Post
    What will that involve, changing jumpers or a different device? What does this device look like?
    Here is a link to a forum thread that has plenty of pictures and even talks about how to make the changes without the programming clip. The information here is similar to what's in the DRAC paper. Many links are dead now but there's still plenty of good information.

    I wonder if it would be possible to wire in a seperate drac module like the PCMs used and calibrate it that way????
    Possibly. If you Tee the DRAC into the VSS signal it would probably work. But you'd still have to gain access the 2K ECM speed signal wire in the dash to cut it and connect it to your new DRAC.

  2. #17
    Fuel Injected!
    Join Date
    Sep 2012
    washington indiana
    that's the way my 91 is works good with a gps to calibrate the switch.

Similar Threads

  1. 1989 tbi truck idle speed change = no change
    By wartribble in forum GM EFI Systems
    Replies: 4
    Last Post: 04-06-2015, 06:02 PM
  2. Replies: 2
    Last Post: 03-01-2015, 02:00 PM
  3. 95 k1500 Gear Ratio change
    By FTK_Ray in forum GM EFI Systems
    Replies: 4
    Last Post: 01-30-2015, 10:27 AM
  4. 305 TPI dies when put in gear
    By greggbruceauto in forum GM EFI Systems
    Replies: 3
    Last Post: 12-17-2013, 01:41 PM
  5. Hi from another gear head
    By Big Al in forum Introductions
    Replies: 5
    Last Post: 10-28-2012, 01:56 PM


Posting Permissions

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