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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Fri, Jan-25-2019, 08:47:20 PM   #11
pbonsalb
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Default Re: Power Steering Flow Restrictor

Like you, I ran without the restrictor for a while with no ill effects. Sometime when you salvage one, add it back.
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Old Fri, Jan-25-2019, 09:02:45 PM   #12
Braymond141
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Default Re: Power Steering Flow Restrictor

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Originally Posted by Frost12850 View Post
I thought that may have been a possibility too. The return hose had the original clamp on it though to the trombone (not a worm clamp).
Not many people opt for the hydraulic hose only work. Most just buy the whole part and many do not include the restrictor.
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Old Fri, Jan-25-2019, 10:41:19 PM   #13
M3AN
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Default Re: Power Steering Flow Restrictor

FWIW, if you buy a new cooler and return line (one piece) from FCP they come with a restrictor, I recently received mine for the 328.

My 09/96 M3 didn't have a restrictor, I've not added one, no problems.

The return line has an ID of 10mm, I imagine that if you buy transmission hose in the USA it will be imperial 3/8" that already offers a small restriction (because it's ~9.5mm). Now, if you just add a hose clamp to the outside of that hose somewhere in the middle and tighten it it will compress enough to act the same as an internal restrictor.

All said and done, I've only heard of them being required if your power steering fluid gets too hot and froths up.
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Old Fri, Jan-25-2019, 11:14:44 PM   #14
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Default Re: Power Steering Flow Restrictor

Quote:
Originally Posted by M3AN View Post
FWIW, if you buy a new cooler and return line (one piece) from FCP they come with a restrictor, I recently received mine for the 328.

My 09/96 M3 didn't have a restrictor, I've not added one, no problems.

The return line has an ID of 10mm, I imagine that if you buy transmission hose in the USA it will be imperial 3/8" that already offers a small restriction (because it's ~9.5mm). Now, if you just add a hose clamp to the outside of that hose somewhere in the middle and tighten it it will compress enough to act the same as an internal restrictor.

All said and done, I've only heard of them being required if your power steering fluid gets too hot and froths up.
Yup I buy just about everything from FCP. Great prices and a lifetime guarantee. I thought about buying the whole piece but itís much cheaper to just buy the hose and supposively better because you can correct the design flaws of the original hose being too short/ poor clamp, etc.
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Old Mon, Jan-28-2019, 11:53:01 AM   #15
Eric M3
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Default Re: Power Steering Flow Restrictor

On my 02/98 M3 I had the restrictor installed before and it is in now in the new hose, not fixed with as clamp. Did replace the originally crimped hoses with hose clamps, hoses for feed and return lines are not high pressure lines, the hoses I use now are for 20 bar. Installed since 2 years. A slight difference is a slightly more power steering support than before with the old hoses. Before the steering wheel support was not that much. This is probably caused by the new hoses. Old hydraulic hoses can suffer from internal deterioration and swell inside = less flow. I have discovered this on older brake hoses also, the original hoses had swelled internally to the extent that the fluid was blocked or limited in flow. Nothing visible externally.
The internal coating of the rubber lines most likely deteriorates and allowes the fluid to saturate/permeate the rubber and swell. The surface of the rubber breaks down over time allowing the fluid to contact the softer rubber compound and swelling occurs.

Pics + dimensions of the flow restrictor from the net
http://photobucket.com/gallery/user/...MzQwMDE=/?ref=
http://photobucket.com/gallery/user/...MzQwMzU=/?ref=
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Discussing Power Steering Flow Restrictor in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)