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8HP75 trans, 2020 EcoDiesel, I got the trans exactly how I want - except no matter what I do it will not shift into 8th until the truck hits about 2000 rpm, no matter what. The truck used to, when stock shift around 1600rpms into 8th and even if I use the stock trans file it won't anymore. Just seeing if anyone has an idea as to why it won't shift into 8th sooner.
Attachment 143773Attachment 143774
The shift schedule is "all uneven". This could be impacting how transmission behaves. Attached, the shift ID 5:
- solid is upshift
- dotted is downshift
- red: 1-2 / blue: 2-3 / brown: 3-4 / green: 4-5 / teal: 5-6 / orange: 6-7 / black: 7-8
There a couple of points in your tune:
- Flare on some upshifts
- torque converter slip
- is the WOT upshift at ~3600 rpms?
DodgeBoy.
YouTube: https://www.youtube.com/@dodgeboy2785
Attachment 143778
The lower throttle shift points are all stock, I did change the WOT to 3600 and blended from there. I don't notice any flare and torque converter slip... tc is all stock and the flare, after the engine was tuned I did firm it up a lot to prevent that. I can definitely even out the shift timing table but I guess I don't see why it still isn't going into 8th earlier. I can take 10% off and reduce the shift point, but it doesn't react. That's kind of where I am at
3600rpms looks quite low. But, if it is what you need/want, sounds good.
Flare is on 6th to 7th gear. When 7th to 8th happens, it is a little wonky as well (little flare and Torque C slip).
If shift schedule is not even, it could induce transmission to act-up. Try even-up the values some more.
DodgeBoy.
Email: [email protected]