Downshift harshness

[Jeurum]

Hi,

I am experiencing some really harsh downshifts both in auto and manual mode.
Downshifting from 8th till 5th is smooth, anything below is really clunky and violent.

My set-up:

Toyota Aristo with single turbo 2JZ (Maxxecu)
BMW 8hp70 trans
Fully solid drivetrain (so I notice any harsh shifts very fast)

Upshifts are spot on, but when I am slowing down and downshifting, especially from 5 to 2, the gearshifts are extremely harsh and shake the whole car. They are also pretty slow compared to upshifting..
At first I thought the harshness came from the converter being locked but even when unlocked it's the same.

I did an experient while driving in mode P8, 8th gear and coming to a complete stop. While idling I shifted down to 2nd and the shifts were also very slow and clunky.

I have no throttle blips currently, some throttle is easing up the downshifts a little I noticed (at least in the higher gears, not 4/3/2), but it should change gears smooth while idling if blips where to blame

Any one got ideas where to look for? It makes driving the car no fun..

[mppetrov]

Same issue here. Driving 220 bhp car and especially from 3 to 2 it is really harsh. Texted Lukas, still no answer yet.

Using 8hp70 with its original convertor.

Noticed when i am on P1 and switch to Manual mode, downshifting them by myself is way more smoother. Last time when Lukas tried to fix it, actually made it worse. Now when downshifting from 3 to 2 is way harsher. Since it downshift manually fair enough i think it is a matter of configuration.

Hope this got resolve soon, i also find it really annoying.

[Jar]

Please check the firmware versions. It is best to update to the latest 10.67a

[Jeurum]

Please check the firmware versions. It is best to update to the latest 10.67a

I already updated to latest firmware, also have downshifts adaptation active, but it makes no difference.. (I came from 10.6)
Down time for shifting also doesn't make a difference, in P1 it's 0, in P8 2 but no difference.

I noticed when I do some manual throttle blip ( I have no dbw yet) the downshifts are smoother, but imo it should be a lot smoother without any throttle blipping, given the fact it's also very harsh with low rpm and not that big negative engine torque..

[Mata]

I believe adaptations only work on gears 4 5 6 7 and 8. I was experiencing harsh shifts from 2-3 and 3-2 so made small adjustments to start% and end% in the parameter gear up and parameter gear down table. Just changing the value by 2 or 3 make aa noticeable difference.

[mppetrov]

I believe adaptations only work on gears 4 5 6 7 and 8. I was experiencing harsh shifts from 2-3 and 3-2 so made small adjustments to start% and end% in the parameter gear up and parameter gear down table. Just changing the value by 2 or 3 make aa noticeable difference.

Could you please post a picture of your table ?

[Racekatt]

Bump

[e83 s54 8hp]