[RBT-Tuning]

Originally Posted by iqraceworks

I'm running a stage3 xHP tune on my 07' 335i. I like the way it shifts, but it still feels like the motor is cutting power a lot as it shifts. I'm assuming it's pulling the timing back and/or closing the throttle body for a spit second as it shifts to put less load on the transmission?

Is there a way to dial some of that out? Would the line pressure bump option help? What about playing around with the Torque Reduction on Upshifts settings?

It just feels like it's giving up a lot of power when it shifts.......

Anyone else have that issue?

Just test it for yourself. But in the end it's a 6HP and not a DCT. The clutches have it's limits.

[iqraceworks]

Originally Posted by RBT-Tuning

Just test it for yourself. But in the end it's a 6HP and not a DCT. The clutches have it's limits.

It's not that the transmission clutches are slipping....it's that the engine is reducing power during shifts.

I will play around with some settings.....thanks!

[RBT-Tuning]

Originally Posted by iqraceworks

It's not that the transmission clutches are slipping....it's that the engine is reducing power during shifts.

I will play around with some settings.....thanks!

They slip on every shift...thats the job of a clutch. How much power it can transmit in the slip phase before it starts to disintegrate (peak power) and for how long it can withstand slip (heat capacity) is what determines the limits of a shift.

[iqraceworks]

Originally Posted by RBT-Tuning

They slip on every shift...thats the job of a clutch. How much power it can transmit in the slip phase before it starts to disintegrate (peak power) and for how long it can withstand slip (heat capacity) is what determines the limits of a shift.

If I log a run, my throttle position will actually close down around 50% during the 2-3 shift, and then fully opens. I'm assuming this is something in the trans tuning.....right?

https://datazap.me/u/iqraceworks/mhd...0&data=3-11-13

[brakthru]

Originally Posted by iqraceworks

If I log a run, my throttle position will actually close down around 50% during the 2-3 shift, and then fully opens. I'm assuming this is something in the trans tuning.....right?

https://datazap.me/u/iqraceworks/mhd...0&data=3-11-13

Your throttle actually closes down to about 35. Mine closes too during the shift. Making your shifts faster during upshifts helps with how rough it feels but it doesnt stop the throttle closures.

@RBT what can we do about the throttle closures?

[iqraceworks]

Yep.....you can really feel it when it closes the throttle on the 2-3 shift. Doesn't seem to do it on the 3-4, 4-5, or 5-6 shift.

Does it have anything to do with the "torque reduction Upshifts" settings? Too much torque on the 2-3 shift....so it's killing the power??

[brakthru]

Originally Posted by iqraceworks

Yep.....you can really feel it when it closes the throttle on the 2-3 shift. Doesn't seem to do it on the 3-4, 4-5, or 5-6 shift.

Does it have anything to do with the "torque reduction Upshifts" settings? Too much torque on the 2-3 shift....so it's killing the power??

Mine was worse with 3rd -4th. You running custom tune? I think running stock load to torque tables may help some with roughness but it doesn't stop throttle closure.

[iqraceworks]

Originally Posted by brakthru

Mine was worse with 3rd -4th. You running custom tune? I think running stock load to torque tables may help some with roughness but it doesn't stop throttle closure.

I'm running the stage 3 xhd tune and MHD stage 2+ engine tune. All of the settings on the xhd are pretty much where xhd put them.

[brakthru]

Originally Posted by iqraceworks

I'm running the stage 3 xhd tune and MHD stage 2+ engine tune. All of the settings on the xhd are pretty much where xhd put them.

I'm on stage 3 and a custom tune but I modified xhp settings to my liking.

[E92xiSS]

does "use stock shiftmaps" option also change shifting speed? my S and M mode shifts just like stock. im using stage 3 btw.

[Saif2018]

Originally Posted by E92xiSS

does "use stock shiftmaps" option also change shifting speed? my S and M mode shifts just like stock. im using stage 3 btw.

Haven't checked it, but the XHP shiftmaps are better in my opinion, also you can adjust them to your taste.

I've got shift speeds maxed out, and the throttle blips at +40%

Torque reduction at +18%

In M mode doesn't Jerk, but you can properly feel the hard shifts especially at WOT, just how I like it

instead of the slush box feeling you typically get from auto transmissions.

[ferocity02]

Anyone flashed their DCT yet? I flashed Stage 2 this morning and didn't really notice any difference. Looking for others' feedback.

[ky0u]

Originally Posted by ferocity02

Anyone flashed their DCT yet? I flashed Stage 2 this morning and didn't really notice any difference. Looking for others' feedback.

On the 6hp flashes, we typically have to drive around for like 50 ish miles for an adaptation period. During this time our shifts are pretty weak but after this it sharpens way up.

I'm not sure if the DCT tunes are the same, but you might have to drive around for a bit before you feel anything if it is.

[iqraceworks]

Anyone else max out all the "shift speed" sliders? Does it shift fast/firm....or rough and hard? Just wondering....

[Saif2018]

Originally Posted by iqraceworks

Anyone else max out all the "shift speed" sliders? Does it shift fast/firm....or rough and hard? Just wondering....

It doesn't shift rough, but it does shift hard/firm and fast in M mode, although I've almost maxed out the Torque reduction setting, so its probably a combination of both.

[iqraceworks]

Originally Posted by Saif2018

It doesn't shift rough, but it does shift hard/firm and fast in M mode, although I've almost maxed out the Torque reduction setting, so its probably a combination of both.

I'm a little confused about the "torque reduction" settings. It says that lowering torque reduction (sliders to the left) can help reduce turbo lag....so I'm assuming that means the throttle/timing isn't backing off as much during shifts....right? I would think that would make it shift harder? Putting more wear on the clutches during shifts.

But then it says that increasing the settings (sliders to the right)...makes the motor reduce the torque during shifts....so I'm assuming that means that it's going to close the throttle/reduce timing more on the shifts.......that will make the shifts faster??

I would think that reducing torque to make shifts faster would be counter productive. So I can have either slow hard shifts, or fast soft shifts??

Can someone explain this "torque reduction" in a little more detail?

[Street of Rage]

Originally Posted by iqraceworks

I'm a little confused about the "torque reduction" settings. It says that lowering torque reduction (sliders to the left) can help reduce turbo lag....so I'm assuming that means the throttle/timing isn't backing off as much during shifts....right? I would think that would make it shift harder? Putting more wear on the clutches during shifts.

But then it says that increasing the settings (sliders to the right)...makes the motor reduce the torque during shifts....so I'm assuming that means that it's going to close the throttle/reduce timing more on the shifts.......that will make the shifts faster??

I would think that reducing torque to make shifts faster would be counter productive. So I can have either slow hard shifts, or fast soft shifts??

Can someone explain this "torque reduction" in a little more detail?

Simply put, as you mentioned, harder shifts vs. snappy softer shifts as you would feel the torque connection between gears. Harder shifts make you feel more connected, but more wear on clutch. It really depends on how you want your driving dynamic to be like.

For me, I set 1st, 2nd, & 3rd gears to +20%, +15% & +10%, just to feel more comfortable on D mode.

I'm not too sure on - % side. I believe there's a standard value for the clutch at 0%

[Saif2018]

Originally Posted by iqraceworks

I'm a little confused about the "torque reduction" settings. It says that lowering torque reduction (sliders to the left) can help reduce turbo lag....so I'm assuming that means the throttle/timing isn't backing off as much during shifts....right? I would think that would make it shift harder? Putting more wear on the clutches during shifts.

But then it says that increasing the settings (sliders to the right)...makes the motor reduce the torque during shifts....so I'm assuming that means that it's going to close the throttle/reduce timing more on the shifts.......that will make the shifts faster??

I would think that reducing torque to make shifts faster would be counter productive. So I can have either slow hard shifts, or fast soft shifts??

Can someone explain this "torque reduction" in a little more detail?

From what I understand moving sliders to the left puts more pressure on clutches and carries more torque over, so it does not shift harder.

Moving sliders to the right causes faster, harder shifts, less load on clutches,

I'm guessing we feel the shifts more because we feel more of a drop in torque and it has to ramp back up more after shifts.

No idea about throttle closures and timing corrections, XHP will have to clarify...