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    Electric hydraulic power steering pump and speed control?

    On the MX5 a common mod is to depower the rack by just looping the ends. Mine has this done to it.

    Now on khanas it can be a bit of a pain with a depowered rack, so i have been considering whether it is worth getting an Astra electric PS pump or similar and re-powering the rack like that. Now, what would be very useful is to be able to link that with a speed input, so that it depowers over a certain speed. This seems to be what the MR2 pump is capable of, but with far more electronics.

    Anyone mucked around with this sort of thing?
    Chris
    ------
    The new nugget
    I never saw a wild thing sorry for itself. A small bird will drop frozen dead from a bough without ever having felt sorry for itself. - D.H.Lawrence

    #2
    Have you ever driven a NA6 with factory power steering? It's a night and day difference compared to the factory non powered cars.

    I'd suggest an electric pump and trying it without the speed input stuff before worrying about it.
    Imagination is more important than knowledge.

    Comment


      #3
      the astra ones are heavy, i'd try fit a factory pump as plan A and an electric assist column as plan B before going down that route.
      Originally posted by ALLMTR
      the theory is the fuel pump is one of the only things that can fuck out on a diesel

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        #4
        Originally posted by TRD-MX62 View Post
        the astra ones are heavy, i'd try fit a factory pump as plan A and an electric assist column as plan B before going down that route.
        Is it possible to get decent steering feel with an electric assist column without needing a supercomputer to run it?
        Imagination is more important than knowledge.

        Comment


          #5
          Originally posted by Ben Wilson View Post
          Is it possible to get decent steering feel with an electric assist column without needing a supercomputer to run it?
          AFAIK someone was selling a controller box for the toyota columns
          Originally posted by ALLMTR
          the theory is the fuel pump is one of the only things that can fuck out on a diesel

          Comment


            #6
            Originally posted by TRD-MX62 View Post
            AFAIK someone was selling a controller box for the toyota columns
            yup.

            Takai- ask smee what he ended up with in the rally rolla. He has an electric column setup with a controller I think.

            1998 MX5 - Ohlins DFV coilovers, Roll bar,15 x7.5 Konig Litespeeds, Mania Intake
            2014 Colorado LT - Oversized Whitegoods. Kid/bike/track hack/horse hauler.

            Comment


              #7
              The Gayzelle has an astra pump in it, nothing fancy controlling it just a dash mounted toggle switch.

              Works well, has good steering feel and you soon realise if you have forgotten to turn it on
              Ban low performance drivers not high performance cars

              Comment


                #8
                Originally posted by rowdytoot View Post
                yup.

                Takai- ask smee what he ended up with in the rally rolla. He has an electric column setup with a controller I think.
                Gravel tyres, dirt road and FWD. Very different.
                Imagination is more important than knowledge.

                Comment


                  #9
                  Originally posted by Ben Wilson View Post
                  Gravel tyres, dirt road and FWD. Very different.
                  Same same bit different, it's an option..

                  Personally id just repower the rack and fit a cooler... [emoji3]

                  1998 MX5 - Ohlins DFV coilovers, Roll bar,15 x7.5 Konig Litespeeds, Mania Intake
                  2014 Colorado LT - Oversized Whitegoods. Kid/bike/track hack/horse hauler.

                  Comment


                    #10
                    Nah, will live with manual depowered rack over retrofitting an electric. Could go back to the stock unit, and might do when i go BP, but for now refitting the NA6 PS doesnt appeal. Last NA6 i drove with PS felt quite twitchy above 80, whereas this feels quite stable up and above highway speeds.
                    Chris
                    ------
                    The new nugget
                    I never saw a wild thing sorry for itself. A small bird will drop frozen dead from a bough without ever having felt sorry for itself. - D.H.Lawrence

                    Comment


                      #11
                      it always seemed to me like a simple pressure switch would solve all of this.. start turning wheel, fluid flows, pressure drops below X so pump turns on. stop turning wheel, pressure builds up again, pump turns off...

                      But there is probably something obvious I'm missing about hydraulics or something that would stop this from working
                      Originally posted by myshortyboomba
                      I've had many gauges in cars. I always found the conrods react faster than a gauge.

                      you can always hear them when they break and they stop the engine immediately so you can't do any more damage.

                      Comment


                        #12
                        Fraud, the way at least the commodore power steering racks I've pulled apart work is that when there's no torque through the input shaft, the fluid flows freely through a bypass hole. So very little pressure.
                        As you apply torque through the input shaft it starts closing the bypass hole (increasing pressure against the pump) and opening a hole connected to the hyrdaulic "ram" on the rack, which of course provides the assistance.

                        Comment


                          #13
                          Could you put an i30 rack in there which is full electric assist, no hydro?
                          2017 Ford Ranger XLT (Jeep Wrangler recovery vehicle)
                          2007 KTM 250 SX

                          Originally posted by Monza
                          I've never considered myself the type of guy to eat arse but I am currently reviewing that policy

                          Comment


                            #14
                            Originally posted by Greg Rust View Post
                            Could you put an i30 rack in there which is full electric assist, no hydro?
                            I thought they did it in the column?
                            "Where can we get hold of a Vincent Black Shadow?" "Whats that?" "A fantastic bike," I said. "The new model is something like two thousand cubic inches, developing two hundred brake-horsepower at four thousand revolutions per minute on a magnesium frame with two styrofoam seats and a total curb weight of exactly two hundred pounds."

                            Comment


                              #15
                              Actually that maybe true. Might be easy to adapt.
                              2017 Ford Ranger XLT (Jeep Wrangler recovery vehicle)
                              2007 KTM 250 SX

                              Originally posted by Monza
                              I've never considered myself the type of guy to eat arse but I am currently reviewing that policy

                              Comment

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