The DCT N54 does not allow launching in 2nd. You have to launch in 1st and yes the gearing is different from the regular N54.
All 200+ launches that I have done were all in 1st gear with a best 60' of 1.84
Keep in mind the DCT N54 does not have a torque converter
AP-V3 & Cobb Protuned by PTF: (New Times Coming Soon)
RENNtech Tuning: 11.78 ET @ 116 Mph in 1/4 mile YouTube
Dinan Stage 3: 12.5 ET (Best) 111 Mph (Best) in 1/4 mile