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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sun, Jul-14-2019, 10:55:11 PM   #1
M3 dude
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Default shimmed power steering pump

hi all,

in preparation for upcoming trackwork i've decided to shim the pressure regulator in my steering pump according to Volke's guide. i've got an old pump lying around so i've pinched the shims off that.
just added 1 shim to begin with.

1. was there a pump bleed procedure i missed (lol)? lost all steering assist for like 5-10 mins. no weird noises from pump so i'm thinking nothing's permanently damaged. steering assist came on in dribs and drabs. seems ok now.

2. to those who've done it, your long term impressions?
i'm still getting used to the new weighing and assist...

thanks
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Old Sun, Jul-14-2019, 11:05:55 PM   #2
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Default Re: shimmed power steering pump

Thereís no priming procedure since the pump is a PD gear pump.

Itís a good balance of increased effort and feel without being a torturous arm work out. I do feel some tiredness in my arms a little at the end of the day but not bad at all. Kind of like I did a light arm workout.


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Old Thu, Jul-18-2019, 08:33:39 PM   #3
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Default Re: shimmed power steering pump

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Originally Posted by M3 dude View Post
i'm still getting used to the new weighing and assist...

thanks
Wow, that much of a difference from one shim? I just re-assembled mine with 3 Volke shims (in addition to the factory one) and was going to put it back in the car today. Wonder if I should have started with one or two..
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Old Thu, Jul-18-2019, 08:45:56 PM   #4
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Default Re: shimmed power steering pump

I bled my new rack by turning the wheel from lock to lock slowly with the engine running. I also left the cap open while doing this. Didn't have any issues or weird things happen once it was back on the ground.
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Old Sun, Jul-21-2019, 11:36:30 PM   #5
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Default Re: shimmed power steering pump

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Originally Posted by Steve M3 View Post
I bled my new rack by turning the wheel from lock to lock slowly with the engine running. I also left the cap open while doing this. Didn't have any issues or weird things happen once it was back on the ground.
did that for rebuilt rack also.. but dry pump doesnt seem to like it. all ok now.

the shimmed pump was really good at the track though. less strain on power steering system (but a little more on my arms)
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Old Mon, Jul-22-2019, 03:54:53 PM   #6
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Default Re: shimmed power steering pump

Interesting, I barely noticed the effect from adding 3 shims.. I’d be surprised if it changed more than 10-15%. I’m pretty sensitive to stuff like that on this car so it’s odd it changed so little. I didn’t have a problem with bleeding, just filled the reservoir, turned the wheel a few times and topped it off again (to the fill line of course).

Guess I’ll be adding another shim or two..
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Old Mon, Jul-22-2019, 04:35:48 PM   #7
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Default Re: shimmed power steering pump

I forget how many shims I used, but I did whatever it is that results in a 25% assist reduction. I found it noticeable immediately! Not regrettable, but certainly perceptible.
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Old Mon, Jul-22-2019, 07:21:12 PM   #8
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Default Re: shimmed power steering pump

I think Iím at the max allowed shimmage...

Is that a technical term? Lol

Love it. I also deleted the cooler and expansion loop. It hasnít given me any issues even with 135 degree track surface temps.


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Discussing shimmed power steering pump in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)