Horribile Downshift during a WOT pass
01-23-2005, 01:12 PM
#1
On The Tree
Thread Starter
iTrader: (6)
Join Date: Apr 2004
Location: McAllen, TX
Posts: 122
Likes: 0
Received 0 Likes
on
0 Posts
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.
01-23-2005, 10:12 PM
#2
TECH Enthusiast
iTrader: (9)
Join Date: Feb 2003
Location: Edmond, OK
Posts: 562
Likes: 0
Received 0 Likes
on
0 Posts
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.
01-25-2005, 04:16 PM
#3
Moderator
iTrader: (11)
Join Date: Mar 2002
Location: East Central Florida
Posts: 12,604
Likes: 0
Received 6 Likes
on
6 Posts
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.
