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Thread: Vortec and cam tunes

  1. #1
    Fuel Injected! kacy's Avatar
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    Vortec and cam tunes

    I started a swap on my 87 tbi truck cam is going to be 214/224 .443/.465 112. I have a basic vortec tune found on this site flashed to a chip, think this will allow the engine to run with this setup?

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    I think it should run but likely run rich, especially at idle.

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    Fuel Injected! jim_in_dorris's Avatar
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    Unless you have a set of vortec heads, it will suck. The timing tables will be all wrong
    Square body stepsides forever!!!

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    Fuel Injected! kacy's Avatar
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    Quote Originally Posted by jim_in_dorris View Post
    Unless you have a set of vortec heads, it will suck. The timing tables will be all wrong
    Sorry it was a long day when I posted, I do have vortec heads

  5. #5
    Fuel Injected! jim_in_dorris's Avatar
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    Then it will actually run fair. It will take a tune to wake up though. Not a lot of lift, but enough duration you may need to bump idle.
    Square body stepsides forever!!!

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    Fuel Injected! kacy's Avatar
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    Which would be better for cam break in stock tune or the tune Dave W. Posted for vortecs?

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    Super Moderator dave w's Avatar
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    Quote Originally Posted by kacy View Post
    Which would be better for cam break in stock tune or the tune Dave W. Posted for vortecs?
    The timing tables is a very important parameter. I'm not sure which tune I posted you are referring to, if the posted tune has the stock Vortec timing table from a Vortec black box PCM it will work better than the stock TBI timing table.

    Typically the stock Vortec timing table can be improved when tuning.

    dave w

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    Fuel Injected! kacy's Avatar
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    Quote Originally Posted by dave w View Post
    The timing tables is a very important parameter. I'm not sure which tune I posted you are referring to, if the posted tune has the stock Vortec timing table from a Vortec black box PCM it will work better than the stock TBI timing table.

    Typically the stock Vortec timing table can be improved when tuning.

    dave w
    I have been searching for the post with the tune but cannot find it, I have it on a pc at home. It was one you said you tuned for just a head swap and removed egr, AIR and disable lean cruise so it could be used as a base tune.

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    This one maybe??? I've cut and paste known Vortec/LT1 spark tables into my tunes. Not perfect but gets you started.
    http://www.gearhead-efi.com/Fuel-Inj...tec-shortblock

  10. #10
    Fuel Injected! kacy's Avatar
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    Quote Originally Posted by stew86MCSS396 View Post
    This one maybe??? I've cut and paste known Vortec/LT1 spark tables into my tunes. Not perfect but gets you started.
    http://www.gearhead-efi.com/Fuel-Inj...tec-shortblock
    I believe that is the one, won't know for sure till I get home. Thank you for finding that.

  11. #11
    Fuel Injected! kacy's Avatar
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    Quote Originally Posted by stew86MCSS396 View Post
    This one maybe??? I've cut and paste known Vortec/LT1 spark tables into my tunes. Not perfect but gets you started.
    http://www.gearhead-efi.com/Fuel-Inj...tec-shortblock
    It is this tune

    hold throttle ope so it runs, working off memory here from snap on mtu2500
    1475 rpm
    MAP kpa 33
    timing light showed 27* with ecm connected
    Last edited by kacy; 12-27-2017 at 08:35 PM.

  12. #12
    Super Moderator dave w's Avatar
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    Standard disclaimer ... Likely goes without saying, but here goes anyway ... The .bin files I've posted work well for the vehicle it was originally "Tuned" for. Individual "Tuning" results can / will vary. There is always possibly of damage or personal injury. Use posted .bin files at "Your Own Risk".

    Always use a Wide Band Oxygen Sensor when "Tuning". When playing poker, trust everyone at the table, but it's a good plan to "Cut the Deck".

    Considering the expensive nature of building an engine, why would anyone not use a Wide Band Oxygen Sensor when starting up / breaking in a new engine?

    The "Ultimate EFI Modification" is spelled "Tuning".

    dave w

  13. #13
    Fuel Injected! kacy's Avatar
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    Quote Originally Posted by dave w View Post
    Standard disclaimer ... Likely goes without saying, but here goes anyway ... The .bin files I've posted work well for the vehicle it was originally "Tuned" for. Individual "Tuning" results can / will vary. There is always possibly of damage or personal injury. Use posted .bin files at "Your Own Risk".

    Always use a Wide Band Oxygen Sensor when "Tuning". When playing poker, trust everyone at the table, but it's a good plan to "Cut the Deck".

    Considering the expensive nature of building an engine, why would anyone not use a Wide Band Oxygen Sensor when starting up / breaking in a new engine?

    The "Ultimate EFI Modification" is spelled "Tuning".

    dave w
    Absolutely, was just looking for some place to start with it. Isn't wide band o2 and narrow band offline at first start?

  14. #14
    Super Moderator dave w's Avatar
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    Quote Originally Posted by kacy View Post
    Absolutely, was just looking for some place to start with it. Isn't wide band o2 and narrow band offline at first start?
    Most wide band O2 sensors (WBO2) have a warm up time of about 30 seconds. Connecting the WBO2 to ignition power with power in both "on" & "start" is a good plan. With "Key On / Engine Off" for about 30 seconds will have the WBO2 warmed upped and ready to go when the engine is "cranking / started".

    The narrow band O2 is usually showing BLM = 128 until the computer goes into closed loop. Usually, the .bin files are programmed for closed loop after the engine reaches 135 degrees Fahrenheit.

    dave w

  15. #15
    Fuel Injected! kacy's Avatar
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    Quick video of it idling with iac disconnected.
    https://youtu.be/sqDFiFHjTEM
    Last edited by kacy; 12-29-2017 at 08:36 PM.

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