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Thread: Trans hunting between 2 and 3

  1. #1
    Junior Member
    Join Date
    Aug 2013
    Posts
    12

    Default Trans hunting between 2 and 3

    I am having trouble with my wifes trans hunting between gears 2 and 3 at about 28mph. we don't have too much traffic where we live but my wife just took the kids to the shore and in light to light traffic where you are hovering right around 30mph it really can't make up it's mind what gear it wants. I took it out for a drive and logged it, but when I look at the log vs the tune what it's doing doesn't make sense. with shaft rpm around 1160 the commanded pressure will drop from 240ish kpa to like 120 with hardly any change in shaft rpm. In the tune shaft rpm should have to drop to somewhere in the 600 rpm range for it to command 120 kpa. It almost looks like there is some noise on the transmission pressure sensor but it seems to follow the commanded pressure. If someone could take a look at my tune and the log. i've included a pid selection and a dashpage. The trans is a hand me down from my dad and has an unknown DTT shift kit in it. When we first got this trans in the shif tpoints were much too high for our needs. I was able to get them to where they should be using mostly the governor pressure map with just a touch of ttva. I doubt it matters but I did also change the 3-4 map some too.

    Thanks
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  2. #2
    Lifetime Member
    Join Date
    Dec 2013
    Posts
    234

    Default

    Quick test would be to reset the gov pressures to "stock" and see if it still shuttle shifts 2-3.

    Also, how is your intermediate (2nd) band adjustment?

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