XHP DCT Flash released

[MParallel]

I expected more feedback in this topic to be honest. As a fresh (3 weeks) 135i DCT owner, I already had found a lot regarding the XPH tune and it's definitely something I'm gonna do.
Even though there is a lot of info, I can't find a definitive answer on the question: is there a setting so manual mode really is exactly that? I read about not shifiting up at redline, but I can't find anything on auto downshifts.

In manual mode I want full manual control, so coming down to a stop, I want to downshift, even if I let in 3. I should shift down to 1.

With all the guys running this tune, someone must know.

[houtan]

If you come to a stop, it won’t let you leave it in 3rd. At some point it will shift to the correct gear but it does it as late as possible.

[MParallel]

Good to know.

I did see some "Trafiic mode" where it keeps it in second.

I guess I'll have to play around when the time comes. Which probably will be April-May

[MParallel]

Still a bit surprised this topic isn't replied to more. I would expect most be on xHP now.

I have purchased the flash now and waiting for some good weather to start playing around with it.

I wonder if xHP is following these threads for feedback.

I personally can't wait to turn of creep. However there is one situation where I really like it. And that's when reversing. You have much more control, specially in tight spaces. Driving it (reversing) with the brake pedal just makes it easier.

I wonder if creep could be made dependable being in reverse or not.

[Luxury]

Glad you commented and brought this to the top. I am strongly considering installing the Genuine BMW Performance 2.81 LSD from the F2x F3x gen for my DCT. Going from 2.56 to 2.81

[MParallel]

Well this is about the XHP flash, not LSD, but if it makes you happy...

But interesting to learn this is an option. I would love a genuine BMW LSD for my 135i.

Anyways, I flashed to XHP stage 2 this weekend and now adjusting to the new feeling. Oly additional setting I set was disable creep and disable kickdown switch.

Specially creep was a main reason to get the flash. However, do to our DCT being wet clucthes, there is still drag, even with the clutches open. So depening on fluid temp/road gradient etc, it can still creep, albeit, much much less. But not having to keep the foot in the brakes all the time, is not a thing.

For kickdown I thought it would suppress downshhifts, but of course that was wrong reasoning from me. It suppresses the extra downshift. Makes sense now, so I guess it's not really handy for me. Though I am not using any launch control stuff.

Having zero 'jolts' when flooring it and smashing through the gears unless in Sport/DSC OFF mode feels so weird. It's like it being an EV and you only see the display change gears. While it's great that it can do this, I love the little kicks you get slamming into the nex gear.
So I'll have to play around with the torque reduction/punch setting to get some back, as I'm not in DSC OFF mode most of the time.

Stage 3 I will try later as I didn't want to go all-in yet, as you get used to new stuff quickly.

[Luxury]

Yeahh a minor hijack. Only to explain why I and possibly you and certainly others in the future will require it. I'm 98% sure I will be getting this tune. 100% sure that the Genuine BMW LSD pumpkin (33108659989) will fit, only requires swapping the rear diff cover to use our stock one.

You're saying that when driving in D with DSC on and sport off (civilian mode) it is too smooth? I think mine jolts too much in D, regardless of pedal position. Your description of EV smoothness is enticing. Sorry that's not the experience your were hoping for

[ghost135i]

Originally Posted by MParallel

Having zero 'jolts' when flooring it and smashing through the gears unless in Sport/DSC OFF mode feels so weird. It's like it being an EV and you only see the display change gears. While it's great that it can do this, I love the little kicks you get slamming into the nex gear.
So I'll have to play around with the torque reduction/punch setting to get some back, as I'm not in DSC OFF mode most of the time.

Stage 3 I will try later as I didn't want to go all-in yet, as you get used to new stuff quickly.

If you want a more aggressive driving experience, go to stage 3 instead of tweaking torque punch and torque reduction on stage 2. You CAN make it punchier doing that on stage 2, but XHP made the stage 3 map for the exact feeling you are looking for, so I’d go right to it.

On my 1 series, I messed with settings a bit, but not as much as I did with my m4 recently. This is just due to me not racing the 1er. On the m4, I lowered torque reduction a LOT, and altered the shift maps slightly to optimize 60-130 measurements.

[ghost135i]

Originally Posted by Luxury

You're saying that when driving in D with DSC on and sport off (civilian mode) it is too smooth? I think mine jolts too much in D, regardless of pedal position. Your description of EV smoothness is enticing. Sorry that's not the experience your were hoping for

XHP Stage 2 is insanely smooth. They have done an incredible job refining the DCT transmission behavior on every platform I’ve used them on. If you go from the stock DCT tune to XHP, it is a night and day difference. I even can say it’s better than the M4 GTS trans tune I had after I initially bought my m4 before flashing over to XHP.

If BMW released the F8X platform with the XHP transmission tune, I think people would have loved them even more.

[MParallel]

Originally Posted by ghost135i

If you want a more aggressive driving experience, go to stage 3 instead of tweaking torque punch and torque reduction on stage 2. You CAN make it punchier doing that on stage 2, but XHP made the stage 3 map for the exact feeling you are looking for, so I’d go right to it.

On my 1 series, I messed with settings a bit, but not as much as I did with my m4 recently. This is just due to me not racing the 1er. On the m4, I lowered torque reduction a LOT, and altered the shift maps slightly to optimize 60-130 measurements.

Alright, makes sense.
I will do this first, before starting to tweak. I guess it would be a shame not using stage 3, and spend much time tweaking stage 2 only to make it stage 3.

Anybody an (ex) E90 M3 DCT owner here? I’m wondering about the no-creep in the M-DCT vs XHP no-creep setting for non-M DCT. Since both transmissions are physically the same, I can only assume that both ‘versions’ of no creep are the same i.e. the M DCT is wet clutch also, so it must have the same issue of some clutch drag, even if it’s just a little.

The creep can be very handy in slow speed situations like reversing / parallel parking. On the M cars you can initiate this with a dap of throttle. I’ll ask XHP if this would be possible to implement.

But what then makes me wondering. With the stock creep on non-M DCT’s, how is this even accomplished? The clutches obviously can’t be fully closed as this would stall the engine. So is it simply a matter of slipping the clutches? If so, this means that at every stop and foot on the brakes, the DCT is slipping the clutches all the time. Doesn’t sound ideal, even with wet clutches.
So I guess in the long run, disabling creep is favorable.

PS: forgot to ask: or does an M3 DCT actually shift into Neutral coming to a complete stop, to have zero creep?

[powerbait]

The M DCT in the E9X M3 behaves completely different from the 135i DCT. It's like they tried to tune the 135i DCT to drive and feel like an automatic trans. I hate it with quite a bit of passion, while I absolutely cherish the M DCT in my e92 M3, especially with the GTS tune/coding. This is the whole reason I even considered the DCT in the 135, boy was I let down. I've also purchased the XHP tune for the 135, and while it is a bit of an improvement, the best part is turning off the creep. It still pales in comparison to the stock tuning of the M DCT. The whole behavior is different, especially going on and off throttle while in gear. The M acts exactly like a manual trans, the 135 does some wonky stuff that makes it very difficult to be smooth with the throttle while trying to go fast. It's not linear, or consistent when getting back on throttle, almost like it disengaged the clutch, where as the M is locked in gear the whole time. I'm ready to sell it, and it has already been replaced by an e90 M3 DCT.

[powerbait]

Originally Posted by MParallel

PS: forgot to ask: or does an M3 DCT actually shift into Neutral coming to a complete stop, to have zero creep?

I believe when coming to a stop the M-DCT goes into neutral. I have stiffer motor and trans mounts in my e92 and can distinctly feel/hear this disengagement.

[MParallel]

Originally Posted by powerbait

The M DCT in the E9X M3 behaves completely different from the 135i DCT. It's like they tried to tune the 135i DCT to drive and feel like an automatic trans. I hate it with quite a bit of passion, while I absolutely cherish the M DCT in my e92 M3, especially with the GTS tune/coding. This is the whole reason I even considered the DCT in the 135, boy was I let down. I've also purchased the XHP tune for the 135, and while it is a bit of an improvement, the best part is turning off the creep. It still pales in comparison to the stock tuning of the M DCT. The whole behavior is different, especially going on and off throttle while in gear. The M acts exactly like a manual trans, the 135 does some wonky stuff that makes it very difficult to be smooth with the throttle while trying to go fast. It's not linear, or consistent when getting back on throttle, almost like it disengaged the clutch, where as the M is locked in gear the whole time. I'm ready to sell it, and it has already been replaced by an e90 M3 DCT.

XHP should solve this. Stage 3 is basically the GTS tune, with more settings.
The gearbox is the exact same, so it's all in the software.

Any other can only be related to the engihe. Turbo 6 vs NA V8. Nothing beats NA individual throttle bodies for throttle response.

ps from all the other info I read so far, the M3 is not in N when at a stop. The gear indicatpr should refelct that.
I'd love to drive one some day. But if it really never ever even creeps a marginal bit, tehn it must be in N, otherwise clutch drag would still give some creep.

XHP should have a setting made to option disable creep through N then.

Having said that, I just found M3 owner's manual and found the answer:

"When the verhicle stops, the transmission automatically shifts down to first geär"

[powerbait]

What ever it's doing, it is completely disengaged and the car freely rolls, definitely no clutch drag.

I went immediately to stage 3 with XHP when I got it, it's an improvement, but I'm still not satisfied. It's all software. On the M3, the US, Euro, CRT and GTS DCT tunes are all loaded from the factory, selecting those is very similar to coding features, where you select the VO of the model you want then check the tune profile you want. I'm probably oversimplifying it, but when I had it done, there was no software file loaded. This is not the case for the 135, the control module is different. That's probably why you can't select the shift harshness like you can in the M3 with six levels, level 4 and up do a nice throttle bump to rev match.