Results 1 to 15 of 46

Thread: 7747 running issues

Hybrid View

Previous Post Previous Post   Next Post Next Post
  1. #1
    Fuel Injected! mmigacz's Avatar
    Join Date
    Oct 2013
    Location
    Sheboygan Falls, WI
    Age
    50
    Posts
    161
    I leave my lid off (since I'm swapping chips a lot). However, you can space the lid up with weather stripping to make clearance, if you are concerned with dust getting in. Also, that picture shows them using a spacer before the G2 adapter. You can omit the spacer and solder the G2 adapter directly to the circuit board. If you read the tutorial on moates they mention this.
    Last edited by mmigacz; 01-10-2017 at 03:50 PM.
    1986 ski centurion boat, 351W, gt40P heads, edelbrock performer rpm, 1227747 ecm, 72 lb/hr injectors (@18 PSI fuel pressure), .490/.490 lift, intake 278 duration, exhuast 282 duration, 112 lobe separation

    1969 camaro, 355ci, performer RPM intake, camel hump heads, 1227747 ecm, 454 throttle body (@18 PSI fuel pressure),

    2016 Chevy Cruz

    2014 Chevy Silverado

  2. #2
    Fuel Injected! kacy's Avatar
    Join Date
    Jun 2016
    Location
    Port. St. Lucie FL
    Posts
    73
    sorry for all the questions, but are these chips reflashable or are they a one and done deal?

  3. #3
    Fuel Injected! mmigacz's Avatar
    Join Date
    Oct 2013
    Location
    Sheboygan Falls, WI
    Age
    50
    Posts
    161
    Quote Originally Posted by kacy View Post
    sorry for all the questions, but are these chips reflashable or are they a one and done deal?
    That's all right. I had my share of questions when I started... Yes, the 27SF512 chips are reflashable. For a starting point, I would buy (2). One for the ecm and one for changes.
    1986 ski centurion boat, 351W, gt40P heads, edelbrock performer rpm, 1227747 ecm, 72 lb/hr injectors (@18 PSI fuel pressure), .490/.490 lift, intake 278 duration, exhuast 282 duration, 112 lobe separation

    1969 camaro, 355ci, performer RPM intake, camel hump heads, 1227747 ecm, 454 throttle body (@18 PSI fuel pressure),

    2016 Chevy Cruz

    2014 Chevy Silverado

  4. #4
    Fuel Injected! kacy's Avatar
    Join Date
    Jun 2016
    Location
    Port. St. Lucie FL
    Posts
    73
    Picked up an ASDU chip from pic a part yard, now shows 142 itn and 170 blm at idle using same adx and xdf, in the process i think I knocked a vacuum line for hvac off as I cant get air to blow from defrost or hot air.

  5. #5
    Fuel Injected! mmigacz's Avatar
    Join Date
    Oct 2013
    Location
    Sheboygan Falls, WI
    Age
    50
    Posts
    161
    sounds like you need to get that vacuum leak found. Somebody suggested getting a heated o2 sensor, did you try that too? Post the data log, I'm curious if the O2 swings are still on the lean side. Is egr connected?
    1986 ski centurion boat, 351W, gt40P heads, edelbrock performer rpm, 1227747 ecm, 72 lb/hr injectors (@18 PSI fuel pressure), .490/.490 lift, intake 278 duration, exhuast 282 duration, 112 lobe separation

    1969 camaro, 355ci, performer RPM intake, camel hump heads, 1227747 ecm, 454 throttle body (@18 PSI fuel pressure),

    2016 Chevy Cruz

    2014 Chevy Silverado

  6. #6
    Fuel Injected! kacy's Avatar
    Join Date
    Jun 2016
    Location
    Port. St. Lucie FL
    Posts
    73
    Quote Originally Posted by mmigacz View Post
    sounds like you need to get that vacuum leak found. Somebody suggested getting a heated o2 sensor, did you try that too? Post the data log, I'm curious if the O2 swings are still on the lean side. Is egr connected?
    We are currently having an ice storm here so working on it is scarce, I have not tried a heater o2 as i just bought this single wire, egr is still disconnected. I have to get a new tv cable before I can drive it so logs would only be at idle.

Similar Threads

  1. Need software for AMC 258 running 7747 GM TBI
    By cs641 in forum GM EFI Systems
    Replies: 8
    Last Post: 04-13-2016, 10:17 AM
  2. Replies: 6
    Last Post: 03-09-2016, 08:19 PM
  3. Replies: 52
    Last Post: 11-08-2014, 02:24 AM
  4. fuel curves for 7747 running stock vortec shortblock
    By ODDDOYLERULES in forum GM EFI Systems
    Replies: 30
    Last Post: 12-01-2013, 01:11 AM
  5. Issues with TBI 7747 tune
    By srobertsfsj in forum GM EFI Systems
    Replies: 40
    Last Post: 04-13-2012, 08:25 PM

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
  •