Results 1 to 3 of 3

Thread: 7747 BPW vs VE1or2 table

  1. #1
    Carb and Points!
    Join Date
    Feb 2022
    Posts
    8

    7747 BPW vs VE1or2 table

    Ok. I’m in the process of tuning my 85 G20. Early Crate 350 with 7747 ECM. most of the fuel map and timing is good but warm idle has a slight miss. Ive read bpw can do this. Mine is in the 140ish range. If i wanted to decrease bpw, by how much do i need to increase ve1 or ve2 to compensate and keep the fuel map close to the same?
    thanks

  2. #2
    Fuel Injected! kilohertz's Avatar
    Join Date
    Feb 2021
    Location
    Slightly left of Vernon, BC
    Age
    60
    Posts
    74
    I am still pretty new at this but I have been reading and learning and have tuned a 7747 pretty well so far on a '49 Ford flathead. The only thing I can contribute at this point would be to ask if your BIN is setup for Asynchronous or Synchronous fueling? From what I have read, Synchronous is preferred. One injector pulse for every dist. pulse.

    Just throwing something out there for you.

    Cheers
    '49 Ford F-47 Flathead with GM TBI
    '66 Corvair planning a GM TBI
    '68 Firebird ragtop 7427 TBI going in
    And a bunch of other cars and bikes

  3. #3
    Carb and Points!
    Join Date
    Feb 2022
    Posts
    8
    Quote Originally Posted by kilohertz View Post
    I am still pretty new at this but I have been reading and learning and have tuned a 7747 pretty well so far on a '49 Ford flathead. The only thing I can contribute at this point would be to ask if your BIN is setup for Asynchronous or Synchronous fueling? From what I have read, Synchronous is preferred. One injector pulse for every dist. pulse.

    Just throwing something out there for you.

    Cheers
    Thanks. I had read through your thread. Mostly the tune is good. Van runs great. Just not totally happy with warm idle. I had read somewhere there’s a fine line when it comes to bpw and idle. So i wanted to tweak that and scale my ve tables accordingly.
    Now I’m thinking of using to the 7427 ecm. Just need to find a 700r4 bin.

Similar Threads

  1. 7747 VE Adder table questions
    By Dieselsj in forum GM EFI Systems
    Replies: 5
    Last Post: 12-18-2020, 05:51 PM
  2. 7427 5.7 Performance Spark table from 7747.
    By Unorthodox122 in forum GM EFI Systems
    Replies: 8
    Last Post: 09-07-2019, 03:52 AM
  3. $42 VE2 table?
    By 57210 in forum GM EFI Systems
    Replies: 4
    Last Post: 04-28-2015, 11:26 PM
  4. Smoothing VE table / Excessive Knock? - $42 – 7747 - ASDU
    By Sammy_Johns in forum GM EFI Systems
    Replies: 0
    Last Post: 07-29-2014, 10:14 PM
  5. $EE O2 table help
    By lt4dave in forum TunerPro Tuning Talk
    Replies: 3
    Last Post: 07-11-2012, 01:40 AM

Bookmarks

Posting Permissions

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