Results 1 to 15 of 15

Thread: Engine swap put a vortec motor in non vortec truck and runs horrible

Hybrid View

Previous Post Previous Post   Next Post Next Post
  1. #1
    Carb and Points!
    Join Date
    Feb 2016
    Age
    29
    Posts
    4

    Engine swap put a vortec motor in non vortec truck and runs horrible

    I have a 1990 Chevy K1500 my motor went out was a 350 tbi and bought a brand new crate motor from GM it's a 1997 350 vortec we got the intake to make it where my throttle body is on it. It has no balls just falls on its face. Need help really bad.

  2. #2
    Super Moderator dave w's Avatar
    Join Date
    Feb 2011
    Posts
    6,268


    Are wanting to learn how to burn your own Performance Chip?

    dave w

  3. #3
    Carb and Points!
    Join Date
    Feb 2016
    Age
    29
    Posts
    4
    Quote Originally Posted by dave w View Post


    Are wanting to learn how to burn your own Performance Chip?

    dave w
    I had a chip made for it and it gave it a let of power but on take off would die because to much fuel and just blew fuel out tail pipes was told chip was how it was so sent back. Everywhere else says they can't tune or make a chip that will work.

  4. #4
    Super Moderator dave w's Avatar
    Join Date
    Feb 2011
    Posts
    6,268
    Quote Originally Posted by Stewh1 View Post
    I had a chip made for it and it gave it a let of power but on take off would die because to much fuel and just blew fuel out tail pipes was told chip was how it was so sent back. Everywhere else says they can't tune or make a chip that will work.
    It is a steep learning curve to "Tune" a chip. Knowing the engine specs is not enough information to burn a performance chip. Myself and other members here use TunerPro RT to "Tune" a chip.

    The basic "Tune" process goes something like this:
    Burn a chip based on the engine specs.
    Use TunerPro RT to collect data logs.
    Crunch the data log for rich / lean fuel conditions, spark knock, and other basic engine parameters.
    Burn another chip, data log ... crunch the data log ... rinse and repeat until tuned.

    The best performance chips are "Built" not Bought.

    dave w

  5. #5
    Carb and Points!
    Join Date
    Feb 2016
    Age
    29
    Posts
    4
    So me tune a chip myself?

  6. #6
    Super Moderator dave w's Avatar
    Join Date
    Feb 2011
    Posts
    6,268
    Quote Originally Posted by Stewh1 View Post
    So me tune a chip myself?
    Yes
    There are several gearhead-efi members who have successfully tuned their own chips, with help from other gearhead-efi members.

    dave w

  7. #7
    Fuel Injected!
    Join Date
    Oct 2013
    Posts
    1,022
    Your best bet might be to buy either an emulator from Moates or a DynamicEFI conversion and learn to tune it yourself. There are a few members here who have tuned Vortec engines and could give you a timing table that work fairly well. Then, you just need to work on the fuel. You can probably get about 75% of the way there without a wideband O2 sensor but eventually you have to install one to do the wide open throttle tuning.

    But to begin with, you will first likely either need more fuel pressure or larger injectors to provide enough fuel for that engine. So you could swap in a TPI fuel pump and a new spring in the regulator to get the pressure up to around 16-18psi. You could try the spring first but it's doubtful the stock pump can keep up to the fuel demands at a higher pressure.

  8. #8
    Carb and Points!
    Join Date
    Mar 2016
    Age
    46
    Posts
    2
    advance timing to 10 degree and turn fuel pressure up it will run good . I have a 1994 gmc and dune the same thing .

  9. #9
    Carb and Points!
    Join Date
    Jul 2013
    Age
    42
    Posts
    2
    Advancing timing and bumping fuel pressure is just a bandaid. It usually will work but a tune will do ten times better on reliability and performance. A moates Autoprom is like $300 and chips are $5-$10 and reusable. You can't buy a good PCM or Tuner for that price anywhere. People are willing to help you get it tuned well if you are willing to meet them halfway. Read the NewB posts and stickies. It seems really hard at first but it gets easier, you gotta make the leap though.

  10. #10
    Carb and Points!
    Join Date
    Mar 2016
    Age
    46
    Posts
    2
    my bandaid will hall ass with no problem and no service engine light on

  11. #11
    Super Moderator dave w's Avatar
    Join Date
    Feb 2011
    Posts
    6,268
    Quote Originally Posted by gmc1994 View Post
    my bandaid will hall ass with no problem and no service engine light on
    I really wonder what the AFR's are with the Band-Aid?

    Power Enrichment - PE measured with a Wide Band O2 Sensor, see attached.

    When you know, you can really GOOOOOOOOOOOOOO!

    dave w

Similar Threads

  1. 1996 to 2000 Chevy Vortec Truck PCM Tuning.
    By EagleMark in forum EFI Tune
    Replies: 4
    Last Post: 12-14-2015, 07:25 AM
  2. Please Help TBI Vortec Engine
    By andy@e-t-d.at in forum GM EFI Systems
    Replies: 8
    Last Post: 11-22-2015, 02:18 AM
  3. Engine Swap from 89 305 TBI to 98 350 Vortec
    By andy@e-t-d.at in forum GM EFI Systems
    Replies: 0
    Last Post: 11-04-2015, 08:39 PM
  4. 97 vortec into a 86 diesel truck
    By j20m715 in forum GM EFI Systems
    Replies: 6
    Last Post: 10-26-2013, 07:20 AM
  5. Lextech truck and Vortec to 0411 Swap now famous!
    By EagleMark in forum OBDII Tuning
    Replies: 8
    Last Post: 08-19-2013, 09:14 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
  •