OEM power steering pump flow rate ??? (1 Viewer)

[half k cruiser]

I was using my Mile Marker hydraulic on the 80 series today, pulling trees out of the pond. It got me thinking, does anyone have the specs on the 2uz power steering pump? It would be nice to know what the flow rates and pressures are. It would also be cool to see if anybody has modified their pump for higher flow rates.

 

[half k cruiser]

I didn't have high hopes for this one, but I'm going to give it a bump and see if we get any hits.

 

[hoser]

I have an old one I can donate to the cause. Just pay for shipping.

 

[half k cruiser]

I have an old one I can donate to the cause. Just pay for shipping.

Sending you a PM

 

[half k cruiser]

So looking through the 4th gen forum I found 1200 psi quoted as the pump bypass pressure. No spec though on flow rate. If that's correct then we are already 300 psi lower than the minimum recommendation by Mile Marker. There is also some sort of vacuum solenoid located on top of the pump (at least on the GX, will check LX tomorrow.) and i'm not sure what that's all about. The good news is unlike the 1FZ that i'm used too, these motors have a pulley driven pump. Trail gear sells several 1650 psi pulley driven high performance pumps for Toyota's. I don't know much about them yet so I will have to do some research.

 

[nukegoat]

The vacuum solenoid just detects pressure and creates a tiny intake vacuum leak to raise rpm

 

[half k cruiser]

The vacuum solenoid just detects pressure and creates a tiny intake vacuum leak to raise rpm

You will have to school me, what's the purpose ? Increase RPM to meet output demand ?

 

[half k cruiser]

Per @abuck99 2004 FSM

 

[half k cruiser]

The above would seem to indicate a proper system is running at just under the recommended 1500psi of pressure. What I find surprising is that going from 1000-3000rpm should only increase pressure by a maximum of 71psi. On my 80 series bumping from idle to 1400rpm creates a drastic difference in line speed on the winch. Of course that is a vane type pump.

Now if we only knew the flow rate of the OEM pump !

 

[nukegoat]

The above would seem to indicate a proper system is running at just under the recommended 1500psi of pressure. What I find surprising is that going from 1000-3000rpm should only increase pressure by a maximum of 71psi. On my 80 series bumping from idle to 1400rpm creates a drastic difference in line speed on the winch. Of course that is a vane type pump.

Now if we only knew the flow rate of the OEM pump !

Line speed is a function of flow rate first

 

[half k cruiser]

Line speed is a function of flow rate first

Agreed, the increase in RPM obviously bumps the flow rate. But the pressure should affect the pulling power.