View Single Post
      09-18-2019, 10:33 AM   #159
Enabled
Lieutenant Colonel
1393
Rep
1,790
Posts

Drives: 328xd Wagon, M2 Competition
Join Date: Jun 2018
Location: Houston

iTrader: (0)

You cannot do fwd only. (Unless you disconnect rear driveshaft)

The transfer case is a shaft directly connected from the transmission to the rear wheels' driveshaft. It is always driving the rear wheels.

The transfer case actuator simply tightens some clutches inside a side gear to apply power to the front driveshaft or releases to remove torque application.

Removing awd would not free up any more power, nor give you significant acceleration. You are still carrying all the extra weight, and the friction losses are still there whether the front wheels are actuated or not.


Also (bonus info) the front differential is a fully locked differential, no limited slip, and not open. The wheel rotation difference gets released through the front driveshaft and inside the transfer case by the clutches.


It's a great system, but some people here have way too many expectations of this xdelete software.
I've been running 2wd mode for one and a half years now, and there is no additional benefit besides being able to spin your rear wheels and get the car really sideways.
__________________
-2014 328d Wagon, 8HP. Self-tuned, 270hp/430ft-lbs.
-2019 M2 Competition MT, Alpine White. Self-tuned 560hp
-2016 Mini Cooper S, MT. Many plans.
Others:
-E36 328is. 2000 Z3 Roady. 2003 VW Jetta TDI Manual. Estoril Z3M Coupe.
Appreciate 0