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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > All-Wheel-Drive (Xi / xDrive) Talk > Xi to RWD options. My experience



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      07-30-2016, 11:00 AM   #1
carguy138
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Xi to RWD options. My experience

I've read numerous posts and threads about people wanting to convert their XIs to RWD without having to gut/swap drive trains. I've tried several options and have settled on the best option.

Option 1: pulling fuses to turn off to force the car into RWD. While this works, the car does NOT like it, multiple gauges do not work and it turns off the JB4. Bad option.


Option 2: pulling front drive shaft. Takes about 30 minutes to remove the 8 bolts and pull the drive shaft. No warning lights or funny issues UNLESS you spin the tires. With the traction control fully off, after a few seconds of tires spinning the TC will abruptly cut power and trigger an AWD malfunction screen on the idrive. JB4 still works fine and the auto clear will turn off the code.

Option 3: pulling the front drive shaft and code the car in this manner http://www.onelapx1.com/blog I did NOT code the Ediff out.

Car will do burnouts all day long, no codes, no funky behavior, etc. I drove the car for several months this way with no issues. The only downside is that since the car has an open rear differential, in corners it will spin the inside rear tire. I finally put the driveshaft back in because the car accelerates much harder. With a mechanical LSD in the rear, this would be an awesome setup.

There you go, option 3 for those who want an easy way to play around with RWD in their XI.
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      07-30-2016, 11:39 PM   #2
Immoralus
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Awesome man. Seems as if this is simple for making your vehicle more however converting to rwd will not make this any quicker right?
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      07-31-2016, 08:09 PM   #3
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Quote:
Originally Posted by Immoralus View Post
Awesome man. Seems as if this is simple for making your vehicle more however converting to rwd will not make this any quicker right?
Converting to RWD makes it slower 0-60 mph (alluded to by the OP). This is because the rear wheels will spin: spinning wheels aren't contributing to acceleration.
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      08-01-2016, 12:11 AM   #4
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I don't really see the point in doing this, unless you are trying to build a track/drift car. In which case it would make more sense to start with a RWD car in the first place.

The major downsides of AWD are increased weight over the front, reduced handling (due to weight), and reduced fuel economy. Otherwise the increased traction during acceleration (especially from a stop) is the main benefit, either in adverse weather or with very high power output.

So by "converting" the xDrive to "RWD" by removing driveshafts or pulling the transfer case fuse, you basically remove all the advantage of AWD whilst still keeping all the disadvantages...
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      08-02-2016, 08:52 AM   #5
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Quote:
Originally Posted by VTECaddict View Post
I don't really see the point in doing this, unless you are trying to build a track/drift car. In which case it would make more sense to start with a RWD car in the first place.

The major downsides of AWD are increased weight over the front, reduced handling (due to weight), and reduced fuel economy. Otherwise the increased traction during acceleration (especially from a stop) is the main benefit, either in adverse weather or with very high power output.

So by "converting" the xDrive to "RWD" by removing driveshafts or pulling the transfer case fuse, you basically remove all the advantage of AWD whilst still keeping all the disadvantages...
pretty much i learned this in my other thread
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      10-17-2016, 01:18 PM   #6
stephen335xi
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Bump, anyone else try option 3
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      10-22-2016, 05:57 AM   #7
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Why would you want to go from awd to rwd?
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      10-22-2016, 11:34 AM   #8
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Lose weight, power limitations, problems with front drivetrain.
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      01-29-2017, 06:05 AM   #9
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First post here bringing this thread back. I just picked up an 07 335xi and have a question: is the dynamic performance control (FDB) present on the 07 and 08 xi's? The link in the first post for the coding article sounds like maybe this is only on the later xdrive badged models. I would be excited to lock in the 20/80 torque split with this option if possible.

Thanks!
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      02-08-2017, 04:11 AM   #10
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A question - what is the situation with N52's xdrive..does it need coding at all,or just remove the front driveshaft?
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      02-09-2017, 12:33 PM   #11
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xdrive to RWD

Pulling a driveshaft to make the car rwd seems kinda excessive but for a long term solution it makes sense. Yes the 0-60 will be slower as awd cars are faster off the line anyways. But converting to 2wd for long periods of time would probably increase your mpg a lot. Personally If I want to spin the tires the fuses are the quickest option but I like the car in awd anyways.
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