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Power steering box pressure
Topic Started: Wed Apr 11, 2018 9:34 pm (186 Views)
Dannyj1092
Newbie
[ * ]
Prepairing my rebuild and have decided to keep the original powersteering box, was wondering what psi the standard box runs at as im thinking to use and electro hydro powersteering pump, but dont want to get a pump that overpowers the rack, any sujestions?
Thanks
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MercManCraig
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Craig
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No idea on the flows but my 2.6 PS says 85 bar on the side of it and the one on my 2.0 says 65 bar on it.
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Dannyj1092
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MercManCraig
Wed Apr 11, 2018 9:48 pm
No idea on the flows but my 2.6 PS says 85 bar on the side of it and the one on my 2.0 says 65 bar on it.
Do you think those are maximum pressures or running pressures.?
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MercManCraig
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Craig
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That's just the pressure the pressure relief valve is set at on the pump so it's sort of both depending on the situation. The fluid just circulates freely through the steering box when there is no steering input so no running pressure when idle.
Whatever the case you don't want more than 115-120 bar otherwise you run the risk of leaks ect not to mention it'd be way too over-assisted loosing all feel like modern cars. :X

Plenty electric power steering pumps kicking about from small 90's-2000's cars that'll probably have about the right output.
The old W168 Merc A class's have pretty a nice compact electric pump unit with integrated fluid reservoir. The pressure relief on those is like 70 or 80 bar something around there.


:driver: :driver: :driver: :driver:
Edited by MercManCraig, Wed Apr 11, 2018 11:55 pm.
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Dannyj1092
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Cheers buddy ill look the a class one up
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