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Thread: sluggish any opinions on the tuning i did?

  1. #1
    Tuner in Training
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    Nov 2017
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    ga
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    sluggish any opinions on the tuning i did?


  2. #2
    Advanced Tuner
    Join Date
    Sep 2009
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    763
    Quote Originally Posted by speedfreak636 View Post
    Whats the rear gear? Whats the converter stall speed?

    Gutless 5.3 + 3.06 first gear will feel alot stronger SOTP than a 5.3 with a 2.48 first gear.

    My old 350 Vortec making 310 tq at the wheels felt noticeably weaker taking off from a stop with the 4L85E swapped in it. That being said it was not any slower in the 1/8 mile running down the track before and after. That was in a 6,200 lbs brick on wheels with 3.42 gears at the time. The 4L60E had a 1,600 rpm converter and the stock 4L85E converter was 2,400 rpm stall speed. The 4L80E had more stall speed, more MPH in 1st gear and a better 1-2 gear spacing and made up for the slightly less torquey feel a little further down the road. After the swap I added an air intake, headers, high flow cats, muffler swap, underdrive pulley and e-fans. After the bolt ons it never felt sluggish compared to the 4L60E to me.

    https://youtu.be/-6DZhPN7VHQ

    Wasn't fast but none the less moved really well for a sub 300 HP engine in a heavy box with no rear gear.
    Last edited by Fast4.7; 05-28-2020 at 12:57 AM.