XHP DCT - Experience Thread

E92-Ghandi

Specialist
Feb 25, 2018
94
Hey, im just curious if anyone tried to change diff ratio with xhp yet? We've been thinking about fitting 3.08 lsd to my mates car, and just wondering how this option works.

Aswell if anyone has some experience with that ratio in dct, would like to hear any comments.
Thanks.
I sent them an email couple of weeks back asking about the same, this is what they replied:

"quote"
thats correct. You can fit the M3 diff and then change the ratio in the app and you will be fine again ;)

Yes and then you have to reflash the OTS Map with the custom settings applied
"un-quote"
 

Dagumpf

New Member
May 4, 2019
6
Hi everyone! I have installed XHP software and all pareas to have been working fine. So far IO like the software, but have someone experienced gear not up shifting at high RPM with lot of power? I have had gear "locked" on 4th gear when attempting to shift to 5th gear at high rpm (over 6200 rpm) and when car is going with lot of power (26 psi of boost). This has happened to me twice. Have you heard this happened to someone else. Any advises??
In all of my experimenting I have never experienced this, although I'm only at 26psi to 5000 rpm, down to about 22psi at 6000 rpm. However, I do know the TCU is extremely fidigity if you aren't reporting the correct torque values, even if you use the corrections given in the xHP software.
 

JohnDaviz

Sergeant
Jan 6, 2019
254
In all of my experimenting I have never experienced this, although I'm only at 26psi to 5000 rpm, down to about 22psi at 6000 rpm. However, I do know the TCU is extremely fidigity if you aren't reporting the correct torque values, even if you use the corrections given in the xHP software.
Just today I experienced some weird shift. During a pull I shifted early at ~5.8k RPM and it did not want to shift for a fraction of a second and then shifted and it felt like power was gone.

Log shows that DME requested a Lower Boost Target during this event and activated Tq Limiter 4 and after that 1. I don´t know what happened.

1600256220588.png
 

Dagumpf

New Member
May 4, 2019
6
As far as I can tell it does that when not enough torque is pulled prior during the gear shift, and the rpms between the box and the engine is not accurately enough aligned, so then throttle is properly pulled (if you add throttle to the graph) to match speeds, and this all leads to a very slow gear shift. To avoid this, you have to get the DME reporting the correct torque to the TCU. It's the only way I got it right, the sliders provided by xHP didn't help me.
 
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Dagumpf

New Member
May 4, 2019
6
@RayBan, it would be extremely hepful to actually understand the logic/science/workings/math behind the Torque Reduction and Torque Punch when tuning, how these interact with the torque being reported to the TCU by the DME, etc. Any chance to get some detail on this?
 
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JohnDaviz

Sergeant
Jan 6, 2019
254
As far as I can tell it does that when not enough torque is pulled prior during the gear shift, and the rpms between the box and the engine is not accurately enough aligned, so then throttle is properly pulled (if you add throttle to the graph) to match speeds, and this all leads to a very slow gear shift. To avoid this, you have to get the DME reporting the correct torque to the TCU. It's the only way I got it right, the sliders provided by xHP didn't help me.
Thank you for confirming my suspicion. I already prepared an xhp flash with increased torque reduction.
 

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