Quote:
Originally Posted by smassey321
I find the automatic 4x4 system is one of several things that make performance and smoothness inconsistent. Each time you start your X5, the transfer case calibrates the clutches that send power to the front axle. In my opinion, the degree of lock up of the clutches varies each time you restart the vehicle. If the clutches lock up more than expected, the drive train will bind up a small amount which can add drag. The ECU senses this and then tells the engine to limit torque. If the clutches get bad enough, you actually will get jerking and rough shifts.
As a test disconnect your transfer case at the module. Pre LCI put this in the back by the battery. Remove the cover on your battery and you will see a silver box with ATC700 on it. Unplug and go for a drive. Be careful as stability control and ABS are disabled.
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If it is a Kia i may agree on this statement. But BMW must have more sophisticated system to do the calibration. Actually if the calibration is done once in a while such effect may occur, hence it is done at every start-up, to compensate for changing conditions. Also there is absolutely no reason for "binding" if ,let's say 10% of the torque is sent to the front wheels instead of 0%. This is not a low range system of diff locking. Also if the engine goes in a limp mode it will be a very noticeable reduction in the power, not a variation of the power.