JB4 with DCT

[zzimbile]

So I was driving my friend's 135 with DCT the other day. No mods, everything is stock (even RFTs) except for JB4 in Map 5. First off, the thing pulls like a mother, its pretty crazy. For the first 30 mins or so I was driving it in manual and it was as expected, but then I threw it into auto because I wanted to see how the JB interacted with the DCT. I had it in sport mode (not button) and it felt basically identical to manual, which I thought was nice and very quick.

Then I decided to push the sports button along with it...and wow! The car was almost too fast for its own good, I couldn't keep the RFTs from losing traction in 1/2/3. The only thing that was weird was the shifting, felt very abrupt/jerky and almost shook the car. It also took a little bit longer for the power to kick in during WOT (also felt this in manual with the sports button pressed, so im guessing its a result of the sports button).

I'm looking to get this for my car so I wanted to know if this is normal or if this was just my experience.

[flyboy385]

My '11 DCT does this as well. I usually leave sport off unless I'm doing a 40+ roll-on, as it can get annoying/worrying. I haven't updated my JB4 in nearly a year and a half, so it may have something to do with that. Unless of course, you have the traction control on, which would be the reason for the jerking/interruption of power.

I'm by no means an expert on the subject, but I just thought I'd mention mine does the EXACT same thing.

[zzimbile]

Ok, thats good to know. I'm pretty sure I had traction control on so that could have been one of the issues. Do you find the shifts to be smoother with DTC off?

[flyboy385]

Typically yes. A bit slower, but smoother.

[boyerstyle]

That's my exact set up so far as well. 2011 135i jb4 dct. I have the same experience with the shifting, but then again so does my buddies e90 m3. I have actually grown to like it since it makes the shifting even more dramatic, I have convinced myself there isn't anything to worry about.

[zzimbile]

Originally Posted by boyerstyle

That's my exact set up so far as well. 2011 135i jb4 dct. I have the same experience with the shifting, but then again so does my buddies e90 m3. I have actually grown to like it since it makes the shifting even more dramatic, I have convinced myself there isn't anything to worry about.

I agree, at first I thought something was wrong, but the more I did it the more I liked it. My only concern was if it would have a negative effect on the car. But so far consensus is that it is normal. Need to get back in this weekend to try it out again

[e36addict]

Mine has this same delay when in auto mode and it drives me insane. Only since I installed the JB4 too.. Just driving along, mash the pedal and it downshifts, then there's a good 2 second delay where it seems that it can't figure out what it wants to do. Really, really annoying. Luckily though, most of the time i'm in manual/sport mode anyways.