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  1. #1
    Join Date
    Jan 2013
    Location
    Hampshire
    Age
    38
    Posts
    60

    Electric Power Steering Pump Pressure

    Hi there

    I'm mid build and like some others on here I'm using a Renault electric PAS pump in combination with a hydraulic BMW rack. I seem to recall reading that someone had trouble with their electric pump blowing the seals on their rack due to a mismatch in pressure ratings.

    Has anyone fitted any sort of pressure (or flow) reduction/regulation device to their steering system? (or is anyone running the same combination as me without issue?)

    Cheers, Simon

  2. #2
    Join Date
    Apr 2004
    Location
    East Leake, Nottinghamshire, England.
    Age
    54
    Posts
    9,361
    That was me who had the problem with the seals. Never heard of anyone else with a similar issue but have to say I bought an old pump from a Peugeot 205 which was so much lighter and takes up so much less room compared to the electric pump. I just designed a bracket to hold the pump which would also hold a tensioner pulley from the same car. Works a treat and never let me down.
    Martin

    351W 416.7 HP and 466.8 ft-lbs

    Running Mega Squirt and Edis 8


  3. #3
    Join Date
    Jan 2013
    Location
    Hampshire
    Age
    38
    Posts
    60
    Thanks for the info - good to know of another option. I've got the lexus engine so there is a steering pump which could be relocated if needed, but I'm trying to keep the a/c so not a lot of room for a pulley driven pump.

  4. #4
    Join Date
    Jan 2013
    Location
    Hampshire
    Age
    38
    Posts
    60
    Just a follow up on this:

    I noticed on the BMW steering rack parts diagram that when fitted in the E46 it had a check valve inside the rack side pressure line banjo bolt, BMW part number 32416781261 (fitted instead of a regular banjo bolt). I've therefore bought one of these (from BMW online) in the hope that it controls the pressure as check valves sometimes do. When I'm on the road and have put some miles down I'll report back on whether this worked...

    http://www.realoem.com/bmw/enUS/show...diagId=32_0958

  5. #5
    Join Date
    Nov 2003
    Location
    West Midlands UK.
    Posts
    2,975
    I used a Rover 25 engine driven pas pump in a home made bracket in the space that the AC compressor used to sit in our two AK Lexi's. Pirtex made up the hoses to the BMW rack and it worked a treat. Had the get the inside of the Lexus PS pump pulley reamed out 3 or 4 millimetres ( as Rover was V belt) and new holes drilled for mounting bolts but apart from that it was easy. I believe others ( Alunwill for one) have used SAAB and other small engine driven pumps similarly,

    Cheers,

    Tony
    Supply by blagging, engineering by bodge......

  6. #6
    Join Date
    Apr 2004
    Location
    East Leake, Nottinghamshire, England.
    Age
    54
    Posts
    9,361
    The Peugeot one I fitted comes with the ribbed wheel and resovoir included so no mods required.

  7. #7
    Join Date
    Nov 2007
    Location
    Chester
    Posts
    593
    as Tony mentioned, I fitted a saab pump. It's based on the standard ford pump. A nice little unit. Initially I was a little concerned about the line pressure because I noticed it appeared to be labouring when on full lock. I checked with the rack supplyer who indicated they're tested to 1500 psi. I know the pump has a restrictors in line but couldn't fined what thesaab system was rated at. I bought all the kit to do some pressure tests but just not got around to doing it yet. Maybe next year!

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