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F10 / F11 (2011 - Current)
The new chapter in the highly successful story of the BMW 5 Series Sedan (F10) and wagon (F11)

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  #1  
Old 09-17-2010, 01:33 PM
solstice solstice is offline
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Reason for hydraulic steering on the X-drive?

Does anyone know the official reason why the X-drive models have hydraulic steering?
I've heard reasons why the rwd model have electric steering (fuel efficient, less maintenance, helps with self-parking function ) but I haven't heard the reason why the X-drive do not.
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  #2  
Old 09-17-2010, 01:50 PM
tadtaggert tadtaggert is offline
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Specifically, no, but would assume it has something to do with the 'force' needed to turn and hold wheels with power going to them. The upper limit with electric is the power generated (volts and amps), with hydraulic cylinders can be exchanged/more power taken from the engine.

The only reason EPS is on the rwd models is emission control, EPS reduces the CO2 footprint by some 4 grams per year.
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Old 09-17-2010, 02:34 PM
solstice solstice is offline
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That's what I would guess as well, that the EPS is weaker and can't handle the force/torque applied by the X-drive but I would like to hear the official description.
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Old 09-17-2010, 07:59 PM
Munich77 Munich77 is offline
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What about packaging issues? Do the transfer case and front drive shaft take up the room reserved for the electronic power steering?
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Old 09-17-2010, 08:01 PM
Emilner Emilner is offline
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I am wondering how the steering will be compared to the other F10's? Will the complaints of poor steering go away????????
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Old 09-17-2010, 08:05 PM
solstice solstice is offline
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Quote:
Originally Posted by Emilner View Post
I am wondering how the steering will be compared to the other F10's? Will the complaints of poor steering go away????????
That's what many of us are eagerly waiting to know. The odds are good imo but if tadtaggert is right it will not make much difference. He's take is that it's the new front suspension that is the difference/"problem" not the ESP. We'll just have to wait and see.
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Old 09-18-2010, 09:30 AM
baloo588 baloo588 is offline
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Doesn't makes sense why they did not include electronic power steering!? I have that on my Lexus GS AWD and its suberb! It got a nicer road feel than the BMW. I can feel the road surfaces and the turn-ins, etc with my Lexus GS. Its a very decent handling car that comes extremely close the old 5 series. But that might be biased. So still, BMW could of put the EPS in the BMW 535xi.

Look at the specs for the GS below, it has EPS:

http://www.lexus.com/models/GS/detai...fications.html
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Old 09-18-2010, 09:38 PM
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AzNMpower32 AzNMpower32 is offline
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Probably a packaging issue. BMW has always limited steering and suspension options with its sedans (like no Active Steering in the 3er and prior 5er), citing not having enough room to engineer that into the car. Also, there isn't any Integral Active steering on the current xDrive 5er either. Hence, I bet BMW just stuck a plain ol' hydraulic unit in there.

I don't believe there's anything wrong with Electric Power Steering. If done right (which BMW can do, exemplified in some of their small cars), it feels just as tactile and weighted as a less-efficient hydraulic unit. Plus, fuel consumption and emissions are reduced because the electric pump works only when needed, i.e turning.
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