[jpsimon]

On my old 6MT N54 335 there was a clutch delay valve mod to help a similar shifting feeling. Is this something we can do on the 340?

[E90ROXS]

Originally Posted by deetsnai

I almost always drive in Sport+ with manual paddle shifting. I just put another 40 miles on the tune and the lag seems to be better while in gear.

However, shifting near redline in 1st and 2nd is really rough. The power and boost feels like it cuts out and it is quite jerky.

I know logs would help, but the Bluetooth Connect Kit has been sitting at Extreme Power House for the last 5 day "awaiting pick-up". I emailed Mike, hopefully I'll have it soon.

Edit: I have no other mods

This is exactly how my car is. Those of you with jb4 you can run on map 0 and compare it with map 1. When on map 0 (jb4 disabled) my car runs very smooth. On map 1, the engine shakes more and shifting 1st to 2nd and 2nd to 3rd is really rough. I'm going to remove this POS. Looking into AA. I don't want to take chances with this garbage. I'll post up some logs soon.

[iMinLuv]

Originally Posted by Baldmonkey22

Same here, it's like a hiccup when wot, and the trans shifts, turn jb4 off and it shifts smooth again.


I love the power but not the shifting, so I have it turned off

In first and second gear I also experience rough shifts like there is a slight pause, then boom it hits super hard. I have Bluetooth connect kit but have no clue what I'd be looking at with the logs.

It's also cold AF in indiana right now and I have track package with summer tires so could just be car trying to maintain but even when it's been in the 50s I noticed it. If I don't use the paddles it's noticeably smoother. With paddles if I shift anywhere above ~5000 RPMs it's rough when I'm WOT

[Blk340i]

Originally Posted by E90ROXS

This is exactly how my car is. Those of you with jb4 you can run on map 0 and compare it with map 1. When on map 0 (jb4 disabled) my car runs very smooth. On map 1, the engine shakes more and shifting 1st to 2nd and 2nd to 3rd is really rough. I'm going to remove this POS. Looking into AA. I don't want to take chances with this garbage. I'll post up some logs soon.

I don't believe it's the JB4 causing this. I also have a supercharged grand Cherokee with the ZF transmission and it has the same tendencies when shifting. It may be something in the TCM causing this at certain power levels over what is programmed for. This is just what I believe based on my experience.

[iMinLuv]

Did two firmware updates I assumed since I just got it the unit would be pretty up to date but it wasn't... totally smoothed it out

[mikeleeyh]

Originally Posted by iMinLuv

Did two firmware updates I assumed since I just got it the unit would be pretty up to date but it wasn't... totally smoothed it out

+1 newest firmware fixed it for me.

[E90ROXS]

Originally Posted by mikeleeyh

+1 newest firmware fixed it for me.

Can you provide the url?

[mikeleeyh]

Originally Posted by E90ROXS

Can you provide the url?

http://www.n54tech.com/forums/showthread.php?t=31429

Bottom of the first page

[HitmanHearns]

I did 5 WOT logs for Terry and I did not have that shift lag/choke anymore. This was after I updated to firmware 5e. I hadn't noticed chokes in 5d either.

I just put my bms intake back on so more logs coming!

[Wires]

It's the B58 torque management kicking in at high load shifts. AA will give you the same issues.

You just need to get off the throttle a bit at the shift points, and it will be fine. Even with the car stock, you can slightly feel the power cut at the 2-3 shift, it just becomes a lot more pronounced with a piggy-back.

[E90ROXS]

Originally Posted by Wires

It's the B58 torque management kicking in at high load shifts. AA will give you the same issues.

You just need to get off the throttle a bit at the shift points, and it will be fine. Even with the car stock, you can slightly feel the power cut at the 2-3 shift, it just becomes a lot more pronounced with a piggy-back.

Yup exactly how you described. It's a hard pounding on the tranny. It's not good for the car. Also there is a slight delay during the shifting. It's just not a normal behavior. After all, it's a 60k car! Don't want to treat it like a honda civic.

[Wires]

Guys with manuals would never see this (unless they are doing that full throttle money shift).

You just need to "re-learn" how to drive an automatic when paddle shifting.

[dlcpedro]

IMO has nothing to do with the tune. My car is bone stock except for mpe and awe mids at the moment and i experience this too. Pulling hard after 5k rpms between the first 3 gears. Car feels really rough in between shifts using paddles. In sport+ will feel more like the tires slightly lose traction in between shifts in a xdrive. And when in sport only feels like the xdrive tries to make up for this so you feel a little lag in between shifts.