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Thread: Vortec 350/ Black box

  1. #1
    Junior Member
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    Default Vortec 350/ Black box

    Is it worth changing the factory tune on this PCM? I have a '98 Z71, almost entirely stock with the exception of dual exhaust (factory 2 into 1 muffler removed for 2 mufflers), a descreen MAF, and removed airbox. I manage 16.5-17.5 mpg on pure highway runs and summer grade gas, but mix driving, at least in the winter is horrible at 13-14mpg.

    I know the 411 swap is common, and fairly simple - but is it worth it in my case (truck will not be modded beyond what it has been other than maybe the throttle blase). Or will sticking with the black box pcm get me by - and is it worth spending the license on?

    Thank you

  2. #2
    Lifetime Member
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    Yes, absolutely, my 97 runs so much better and smoother. The transmission shifts far better too.

    Lee

    230" Dragster - 2000 LS1, 02020003 Speed Density, PRC 2.5 Heads,
    MS3 Cam 237/242 .603/.609, Vic Jr. intake, Holley 1000CFM TB,
    PowerGlide, 5000 stall converter. 8.70@154 MPH

    My Projects Homepage: http://www.horsepowerracing.com

  3. #3
    Junior Member
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    Out of curiousity, did you use the base tune from the '01-'02 Express van, or did you modify it?

  4. #4
    Lifetime Member Aloicious's Avatar
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    Quote Originally Posted by 99TransAmls16spd View Post
    Out of curiousity, did you use the base tune from the '01-'02 Express van, or did you modify it?
    if you do your own tuning, the PCM swap is by far the best thing you can do for the truck. I love mine, the 411 and efilive are the best mod I've done yet. if you aren't going to do your own tuning, then the gains are negligable. the main gain from the 411 is the vast amount of control you'll get vs. the blackbox.

    since you mentioned spending a liscense, I'll assume you plan on doing your own tuning, and I would highly recommend it.
    Last edited by Aloicious; December 10th, 2009 at 07:06 PM.
    1996 c1500 gen1e 5.7L - the "LS31", 24x CNP, LS2 coils, modified T56, 12200411PCM running COS3, zz4 cam, custom MPFI, etc. coming soon: Twin Turbos

  5. #5
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    Quote Originally Posted by 99TransAmls16spd View Post
    Out of curiousity, did you use the base tune from the '01-'02 Express van, or did you modify it?
    I modified it, stock tune wouldnt run very well since I had engine mods done.

    Lee

    230" Dragster - 2000 LS1, 02020003 Speed Density, PRC 2.5 Heads,
    MS3 Cam 237/242 .603/.609, Vic Jr. intake, Holley 1000CFM TB,
    PowerGlide, 5000 stall converter. 8.70@154 MPH

    My Projects Homepage: http://www.horsepowerracing.com

  6. #6
    Senior Member
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    change to the 411, my truck shifts so much better, and plus I can access the lean cruise stuff to help with gas mileage.
    2005 chevy silverado, duramax tuned with efilive
    1997 Saturn sc2 turbo, tuned with megasquirt on e85
    2000 s-10 turbo'd tuned with efilive on e85

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