Delay 1-2 WOT shift
Thread Starter
Teching In
Joined: Feb 2016
Posts: 44
Likes: 2
Delay 1-2 WOT shift 1-2 shift has a pause at the limiter. It doesn't bounce off the limiter, it just seems like everything stops for a moment before shifting. The first time it was wheelspinning uphill and actually gave a shift fart like a dsg style box...I passed it off as me maybe backing off on the wheelspin but it just happened again in normal conditions (no shift exhaust farting). Am I looking at a gearbox issue or is it tune related do you think? Car has a Circle D 4c in it.
TECH Junkie
Joined: Dec 2012
Posts: 3,621
Likes: 1,335
From: Iowa
Well...you don't tell us hardly anything useful here
I mean...for goodness sake you didn't even include trans type.
We don't know the vehicle
we don't know the powertrain management...stock ecu, holley, megasquirt, etc
you don't tell us if anything has been recently changed that could cause the issue. Is it a car that's been fine for a year and now out of the blue its acting up...or did it just get a new converter and now it's being screwy
It's hard for anybody to make a recommendation when you don't give us any info
I mean...for goodness sake you didn't even include trans type.
We don't know the vehicle
we don't know the powertrain management...stock ecu, holley, megasquirt, etc
you don't tell us if anything has been recently changed that could cause the issue. Is it a car that's been fine for a year and now out of the blue its acting up...or did it just get a new converter and now it's being screwy
It's hard for anybody to make a recommendation when you don't give us any info
On The Tree
Joined: Dec 2013
Posts: 182
Likes: 11
From: North Vanacouver , BC
Sounds like its pulling a lot of ignition timimg between the shift . I don't have experience working with e38 ecm but I would look at the torque management tables . Especially that its gone SD maybe some changes are required to some tables that were skipped accidentally.
Thread Starter
Teching In
Joined: Feb 2016
Posts: 44
Likes: 2
Thread Update..
So I got my tuner to have a play with it on Thursday. He said he edited the 1-2 WOT shift point. Took it and tested it twice. Dead perfect.
New issue immediately after is that regular cruising 1-2 shift is now neck snapping and delayed (shifting at 2800) rather than the 2200rpm or so rpm that it was before. It had him stumped so he said just see if maybe the ecu wants to re-learn the 1-2 shift. After a tank of fuel there's been no change so back we go... The positive is I finally get to race the car this weekend because Spring just sprung here Down Under.
So I got my tuner to have a play with it on Thursday. He said he edited the 1-2 WOT shift point. Took it and tested it twice. Dead perfect.
New issue immediately after is that regular cruising 1-2 shift is now neck snapping and delayed (shifting at 2800) rather than the 2200rpm or so rpm that it was before. It had him stumped so he said just see if maybe the ecu wants to re-learn the 1-2 shift. After a tank of fuel there's been no change so back we go... The positive is I finally get to race the car this weekend because Spring just sprung here Down Under.
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