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Thread: Need help with trans tune 99 C5 supercharged corvette

  1. #1

    Need help with trans tune 99 C5 supercharged corvette

    Just purchased 99 Maggie SC C5 with many "supposed" upgrades. long story short is that I was misled.
    Car was supposed to have z06 rear with 3:42 but original pumpkin looks original with 3:15 gear tag
    Trans went out after a few days of normal driving 3-4 gear slip but apparently had been freshened up with some high quality parts verified by the current builder.
    Had trans rebuilt with a new Yank SC 3000 stall converter. Car was shifting very hard like before but felt good with no slipping.
    I was very easy on the new trans and TC doing no full throttle or launches until 250 mile break in.
    Never made it that far..... same symptoms showed up again as driving easy and starting to slip in 3 and 4.
    I had not changed anything in the tune because I was being easy until break in plus I'm just now learning.
    Would someone please look at the tune?? The trans is supposed to be built for +600 ft lbs and have a 1 yr warranty but trans rebuilder is wanting tune looked at first. Old tune should have been for stock TC I believe.
    Attached Files Attached Files

  2. #2
    Tuning Addict blindsquirrel's Avatar
    Join Date
    Apr 2017
    Meridian MS
    Quote Originally Posted by ns158sl View Post
    Shift times and pressures look like it would shift hard lol. I didn't see much TQ Management though. 4l60 wont survive long without some sort of torque management. Usually you break hard parts but it still stands. 600ft lb 4l60? That has to be pretty much "fully built?" Billet shafts, sonnax 3-4 smart-tech shell, etc.

    Also, Tune your VE and MAF, they are pretty hacked.
    Nobody wants to hear your straight-piped V6 Camaro/Mustang/Challenger/350Z. You are not in a movie, you are not 'DK'. Everyone hates you.

  3. #3
    Senior Tuner edcmat-l1's Avatar
    Join Date
    Aug 2006
    The calibration is terrible. On both sides, engine and trans. Some of the trans settings are downright bizarre. The TCC 3rd gear release is set higher than the 3rd gear apply. 3-4 shift speed is set to 60 mph and TCC lockup looks like it won't occur until then either. So, with a new stall converter, you're running around town in 3rd gear with no TCC lockup doing nothing more than creating heat. Not saying that's definitely what smoked the trans but it ain't helping none.

    1-2 and 2-3 WOT shift speeds set to zero? Can't say I've seen that before LOL Wonder how well that works LOL

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