You need an older electric pump like the Astra - more modern ones have a CAN connection, and some of them won't run unless they see the right signal from the CAN comms system.

The common Astra ones are easy to fit - you run high current wiring from the battery (via a fusible link) to the terminals on the pump, and switch the lower current wires on the pump via an ignition relay - all the high power switching is done within the pump itself (internal relays).

For the lines, you simply get 2 of the right tails, and get a hydraulic hose crimped together for the pressure side of the pump to the rack - the return line can be simple barbed tails with a reinforced rubber return hose fitted with hose clamps (or you can get another high pressure hose made). Holden actually used this very method in the VL V8, from the factory....

If there were some way of driving it in the HK, the last model Territory racks were fully electric assist, contained within the rack housing - no hydraulics, but they need a computer to drive them correctly.

It doesn't feel any different to a belt-driven pump, as the pressures & fluid volume are pretty much the same.

You'll probably need an idler to get a good wrap around the A/C compressor. For multi-rib inspiration, look at how the VS-VY Ecotec V6 uses both faces of the belt to achieve a path that gets maximum belt wrap on all the pulleys that are prone to slipping (like the A/C, followed by the power steer - which in your case you won't need). I would aim for at least 150, up to 180 degrees of wrap on the compressor.

You want the tensioner on the "return" side of the belt run.

The 2.2L diagram is similar to the best layout for your plans - but you want the idler on the passenger side, and the tensioner on the driver's side, which is basically the "no load" side of the belt run.

If the tensioner is on the passenger side (of the engine) it will be constantly fighting belt torque.

Edited by user Tuesday, 12 March 2019 5:54:30 AM(UTC)  | Reason: Not specified

Personally I'd fit the Astra electric p/st pump. I know of several guys running these & they work well.

They can be hidden under the guard or even in the boot if you want. As Mick said, just run the necessary wiring (two +ve & one earth) a high pressure hose & a return hose & you're done.

Dr Terry

I picked up a whole setup from a TS yesterday, it had about 250k on it, but it looks clean and it was cheap so worst case it allows me to set it all up and I find a lower km one later.