For all those looking for some dyno numbers on the RaceChip Ultimate for the 50i, here you go.
Two months ago, I took my 2016 X5 50i to the dyno for a baseline. The baseline run is in red below and was conducted on a Mustang dyno. I was initially unimpressed with the numbers (352HP, 390ft/lb). After some discussion with the shop owner, in which we talked about the differences between a Mustang and Dynojet dyno, he said that his numbers average 14% lower than a Dynojet. Once I applied the 14% correction, my numbers are right in line with what I am seeing in this post:
http://f15.bimmerpost.com/forums/sho....php?t=1174104
With that sorted out and my X5 verified as making the power it is supposed to, I installed a Race Chip Ultimate and set it to C. After about a month of driving, I went back to the dyno and was very pleased.
#1 Red = Baseline
#2 Green = RC Ultimate C
#3 Blue = RC Ultimate D
Setting C was impressive with an at the wheels gain of 48HP and 47ft/lb (55HP and 53ft/lb if you apply the 14% correction), while setting D was not as good overall. Even though D produced higher numbers, there was significantly less low end power and the delivery was not as smooth. In the end, I am sticking with C.