05-16-2020, 09:56 PM | #1 |
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Deactivate Power Steering?
As much as I love my M2C, the primary complaint I have is the numb disconnected steering. Many have pinned this on either the EPS or how BMW programs the EPS. So, screw the EPS... is it possible to deactivate power steering all together and just go powerless?
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05-16-2020, 11:05 PM | #2 | |
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It's the electric motor (circled in blue) that's connected to the tie rods. Steering shaft only being connected to the outer tube the tie rod/steering rack sits inside of. It's my understanding that it's not even a power steering system, but an electric motor that accepts input from the steering wheel to move the tie rods that turn the wheels. I don't even think our cars use power steering fluid. |
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05-16-2020, 11:37 PM | #3 | |
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05-17-2020, 07:44 AM | #4 | |
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On your first point, if that were the case, it would not just be difficult to turn the steering with the engine off, but actually impossible. Last edited by M Fifty; 05-17-2020 at 07:56 AM.. Reason: Spelling |
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05-17-2020, 07:55 AM | #5 | |
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Disconnecting the power supply to the motor on the steering rack would probably be the easiest way to test this: https://www.newtis.info/tisv2/a/en/f...ering/FpcT7gR1 |
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05-17-2020, 10:46 AM | #6 | |
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My steering wheel certainly does not turn the wheels with the car off. |
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05-17-2020, 11:31 AM | #7 | |
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Try it - you'll see what I mean. |
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05-17-2020, 11:36 AM | #8 | |
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Conversely, I don't actually know if the steering shaft isn't connected to the rack. I just kinda assumed it from that illustration. I'm going out to try it now cause I have to run to the grocery store for milk. Ate eggs every morning for weeks but had to switch to cereal to keep my milk from going bad. Yesterday I used up the last of the milk, so I can finally eat eggs again haha. Omelettes are apparently the most exciting thing in my life right now lol. |
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05-20-2020, 04:35 PM | #9 |
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It is physically connected. Very few cars have completely steer by wire systems.
Here is a good article showing what it looks like inside - https://www.autoevolution.com/news/2...ned-78813.html |
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05-20-2020, 04:56 PM | #10 | |
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Or, if you never experienced how a power-assisted steering car feels with no power steering, find one with hydraulic power steering, remove the belt to the pump and go for a drive. It feels...'distinctive'. HTH |
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05-20-2020, 05:43 PM | #11 |
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Lol, at low speeds it sucks so much, much better at high speeds.
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05-20-2020, 06:25 PM | #12 | |
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The fact that you want me to put my car on jack stands to prove YOUR point is just silly. If you really want to prove me wrong so badly, go do it your self. Last edited by Anthony1s; 05-20-2020 at 06:30 PM.. |
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05-20-2020, 09:34 PM | #13 |
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If I'm not mistaken, isn't the "M Servotronic" EPS system based around less assistance? a.k.a. the heavier steering in sport mode is due to less assistance from the electronic motor. Making it more direct.
The heavy front end/wheels, wide tires, isolating bushings etc are what numb the feeling. Hydraulic systems were great because they amplified steering input AND amplified feedback. I've heard from a M3 owner that the 20" wheels have more feel and that's probably because they ride harsher sending more "feel" back to the driver. |
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05-20-2020, 10:44 PM | #14 | |
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Still won’t be what the e92 m3 had. But at least there’s some adjustability. |
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05-21-2020, 02:08 AM | #15 | |
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Empirical evidence - yes. Plus, read the thread about clunking from the front end turning out to be the steering There's a great picture of the adjuster on the rack. |
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05-21-2020, 06:43 PM | #16 |
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No power steering on a street car is going to be miserable, unless you’re really a point A to point A kind of driver hitting up the country roads.
Anecdotally, during a particularly long endurance race with our R53 Mini we overheated the power steering and it started leaking fluid. The quick fix to get back out was to remove the pump and loop the feed and return lines. At first drive I thought we made a horrible mistake. At slow speeds around the paddock it was quite an arm work out, but once at track speeds it still felt a little stiff, but manageable. This is on a car that stock is almost 1000 lbs lighter than an M2, and this one was fully stripped. I think the rack ratios are designed with power steering in mind. |
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