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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Anyone have steering rpm dip?



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      06-28-2015, 05:23 PM   #1
matthewo
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Anyone have steering rpm dip?

I know the extra load from ps pump causes this. But maybe mine is a bit more pronounced. It's quite annoying with a manual trans when coming from a stop and turning at the same time.

I do have 245 up front and that May account for some of it, also just changed new fluid but didn't help much.
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      06-28-2015, 07:25 PM   #2
cpie168
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I have the exact same problem! Mine is a stock N52 and I noticed the problem is more pronounced with my summer tires (same width as my winters though at 225mm). The problem would often manifest when I make large steering at parking lot speed (e.g., backing out of parking spot, making the last bit of adjustment when moving into a parking spot, etc.). I had the power-steering fluid changed but it didn't help either.

I really wonder if there's a solution to it short of changing out the steering rack which would be $$$$$.
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      06-28-2015, 10:08 PM   #3
matthewo
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Yeah if it's not easy or cheap I will probably just live with it, as it is just annoying, just kinda messes up clutch let out rythem when it hits
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      06-28-2015, 10:11 PM   #4
cpie168
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In my case it would hit only when I'm going slow like in the parking lot and turn the steering wheel a lot and quickly, like when backing out of a parking spot as I said. I don't see it getting worse and it doesn't happen for my winter wheels at all, so I'll just keep an eye on it and go from there. My indy mechanic said there's nothing to be done except change out the whole steering rack which can cause thousands of $.
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      06-28-2015, 11:11 PM   #5
matthewo
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yes you are correct it only happens when going slow for me as well, but that is also the same time as starting out in first gear at times, yes I get it mostly as backing out of a parking space or very slow parking lot driving. I agree the turning the wheel quickly part plays into it.

Im pretty sure there is not much to be done as well, as the computer does see the RPM drop and or load, just like when you turn your AC on and corrects for it, but there is no way for the computer to predict it so it cannot correct it before it happens, I think its pretty normal on most cars, but seems to be a bit more pronounced with this one, feel and hear and audible vibration and shake when it happens.
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