Horribile Downshift during a WOT pass
Horribile Downshift during a WOT pass Doing some tuning with HP Tuners and I am using Jimmyblues settings. The tranny has a transgo and a TCI 3800. What is happening is during a WOT pass the car shifts fine up into third then suddenly downshifts to second banging the rev limiter. No slip, its actually downshifting. I recently looked at the fluid and all is fine. What parameter do I need to tweak to keep this from happening??? Thanks.
Carlos Villalon, Jr.
Carlos Villalon, Jr.
You have to get an A4 spinning pretty high before you go wide open. It's about 75mph in 3rd. If if still down shifts then try a little higher speed and sort of role into WOT instead of like a manual car when you just mash the gas.
Do you see the trans "thinking" it's going into 2nd?
Might be a harness intermittent, since the gear select
I believe is all electric. If one of the control signals drops
you could shift gears uncommanded (which is why I ask
about what the logger says, about that).
As far as settings, I think with the looser converter you
might want to increase the gap between your upshift and
downshift MPH in the part throttle tables, the higher-TPS
cells. I left only a 2MPH "gap" on the 2-3 because I like a
responsive kickdown, but since you are way looser than my
setup this may allow you to "flutter" where I would never
see it.
Might be a harness intermittent, since the gear select
I believe is all electric. If one of the control signals drops
you could shift gears uncommanded (which is why I ask
about what the logger says, about that).
As far as settings, I think with the looser converter you
might want to increase the gap between your upshift and
downshift MPH in the part throttle tables, the higher-TPS
cells. I left only a 2MPH "gap" on the 2-3 because I like a
responsive kickdown, but since you are way looser than my
setup this may allow you to "flutter" where I would never
see it.
