I have an 83 Sr5 4x4 Toyota, I was wondering if anyone knew what the stock power steering pump is capable of putting out in PSI. I was thinking with the right setup I could run full hydraulic steering for cheap. Any input on this is much appreciated.

 

Okay I found the info I was looking for finally, if anyone is interested the stock pump puts out 1300psi at 1 gallon per minute. I think this is going to be possible.

 

Good! Yeah I think with most people that go hydro, they've also converted to highsteer and all that, but that's cool that these older pumps will work.

 

from what I understand the stock pump does not put out enough pressure/GPM to cycle a full hydro steering system fast enough. That is even after modding the passages for more flow. I have seen some trucks on the trail with their steering looking like it is moving in slow motion.

A Howe, PSC or T-G full hydro pump moved 4-5x's the stock pump making the steering react faster.

Maybe Wabbit or 4crawler will chime in on this one.

 

I was looking at the aftermarket pumps they only push around 1900 psi. But yes the flow is alot higher. I was thinking couldnt you just increase the rpm of the pump, and modify the passages as well? At high rpm I think the stock pump would do just fine but at low is where it would be slow reacting. I think by building a smaller pulley to make it rotate faster would make it flow faster. Am I correct on this? The way I figured, I could build a hydraulic with a surface area of 1.750 and that would generate around 2100 pounds of force at 1300 psi. The question is how much force is needed? I understand that it would be different in different scenarios. The smaller I make the surface area the quicker it would react there for it would require less fluid. Making the 1GPM sufficent enough to get the job done.

I am hoping the experts will chime in, come on Wabbit and 4crawler. Teach a 24 yr old your wisdom, I like to learn.

Thanks for all the input on this one guys...

 

I was thinking, what is the maximum rpm that a stock toyota pump could run at and still be stable? Anyone ever experiment with this? I would but I only have 1 pump, anybody want to send me a couple pumps for research?

 

^^^ that was a serious question^^^ I am a machinist thats specializes in high energy hydraulics, pnuematics and robotics, I engineer and build. I am sure I can figure out a way to get a full hydraulics steering system to work without costing you an arm and a leg. Just trying to help the yotatech community here folks.

 

I would probebly make my own high steer system to work with this setup.

Thanks for the input.

Any suggestions, I am wide open for any comments and suggestions, or bashing...

 

not so much the PSI but the amount of fluid moved.

Might consider searching the toyota folder on pirate
http://pirate4x4.com/forum/forumdisplay.php?f=12

though not specific to toyota this article on hydro steering will help:
http://pirate4x4.com/tech/billavista...ing/index.html

 

Stock pump is 1 gpm at best. My full hydro pump is 4 gpm. IMO stock pump will NOT keep up no matter what you do to it. Hydro assist is pushing the limits and some folks get it to work right with a stock pump, some don't.

I've had manual steering (pump went out), power steering, hydro assist and full hydro and the first three suck by comparison when wheeling.