1-2 shudder at WOT
- Thread starter donky4444
- Start date
+1 on it being shift pressure. Back when I was running Unleashed I had the same issue and thought it was wheel hop. After I explained it to Torrie he said it was shift pressure. I believe at the time he had it set to 250. Once he set me to 200, the issue went away and the shift was still crisp.
LME got back to me with the 4X plus tune that should fix the 1-2 shudder. They said they also added grade assist to it which makes the car perform like the 13+ does when you put it in Sport mode. I just put the car in manual but let it shift itself. I went for a short 4 mile drive to pick up dinner and the shudder is gone and the grade assist seems pretty sweet. More testing and playing with it later this weekend. Thanks again to to LME for a fast turn time on getting ,e squared away.
donky4444 said:
A fast turn around was the least they could do...No need to pat them on the back for something that needed addressed....It's like when someone sends you the wrong part then they say don't worry you don't have to pay the shipping back lol...Damn right you don't.
wasinger3000
New member
Did some testing tonight. -15% shift pressure on 1-2 made a noticeable difference in the "shudder" but it's still there so I'm going to try -25% next.
Brucelinc said:
Stock is about 150-175 I'll look when I get home I can't remember exactly...it doesn't take a lot to make a noticeable difference...the pressure smoothly increases with the amount of torque commanded and with rpm...so at wot and at 6500 rpm in the table is where the values are highest.
And all the tables for each gear is different...the 2-3 part throttle pressures are way higher than the other gears at part throttle..not sure why ford did that so I lowered mine to what the other gears are and it shifts smoothly after a reflash so the adaptive doesn't have much to learn...also it seems that the higher gears can tolerate more pressure at wot than the 1-2 shift...don't ask me why
wasinger3000
New member
I wish I know what it was at now and what the number actually represents. Is it 200 psi? Or just some kind of reresentarive number... I used my x4 to lower it by 25% of what I don't know... it's better still but for some reason after 4 or 5 wot runs the car goes back to the shudder shift. Like it enjoys being stupid...ajpturbo said:
I asked Torrie to change the shift pressure last night at 2am and I woke up to a new tune haha. Love that service!
So I'll see how it does now.
Yeah pretty sure it's psi...I'll look at the units when I get home....wasinger I hate the global modifiers that u can do on the device..I'm not really sure how they are applied to the tune..personally I prefer to change the values in the actual tables but u would need the software and the tune in mtf format which most tuners won't give u anyway..so in ur case ur doing what u can...it's really not cost effective to have the software and pay a tuner for the mtf,assuming he will even give it to u, unless u enjoy tinkering and learning to tune...much cheaper to just buy a tune from lms or torrie
wasinger3000 said:
Hope this tune works to stop your problem...
The problem ajp points out is also complicated by the learning nature of the ECU and other modules... likely why your stutter got better and then the problem recurred... because the car found a way around your changes to accommodate a parameter left unchanged in the complete tune (i.e. that was not changed with the "global" changes you made).
Ultimately, it appears to me that those kind of changes are designed to let you try something out... and then have your professional tuner make the changes so they "stick".
