I am trying to get a sense out of how much pressure the power steering pump puts out during idle on a FJ60 and if the output pressures decreses with increase in engine RPM.
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power steering pump pressure
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cause my radiator fan of the FJ60 runs with output oil out of power steering rack before it goes in to reservoir so at idel ,my fan run faster but when engine RPM increases, fan speed decreases.
So I am guessing, there must be a check valve inside the PS pump that reduces pressure as engine RPM increases.
My guess is that he thinks that the clutch fan assembly runs off of the PS pump. That's the only sense that I can make of it.
If it is a hydraulic motor running the cooling fan that would be kinda neat. It looks like they make motors that would work, might be easier than electric, aside from the extra work anyway.
Hydro-steer
Hydro-brakes
Hydro-cooling??
Hydro-steer
Hydro-brakes
Hydro-cooling??
........................................................................
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Is it only me that dosn't get one bit of this?
yes , its you and few others
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yaap and Toyota is only one that offers this fan and a motor that runs of the power steering oil.
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O.k now that's more like it.
Dude, seriously. What you have there is not run of the mill and not only that you have it on a smoker not an FJ so it was a very confusing question you posed.
That's a pretty cool set up. It doesn't shorten the life of PS pump being it now has to pump for the fan as well?
Dude, seriously. What you have there is not run of the mill and not only that you have it on a smoker not an FJ so it was a very confusing question you posed.
That's a pretty cool set up. It doesn't shorten the life of PS pump being it now has to pump for the fan as well?
The pump has a pressure relief valve to bypass excessive pressure at higher rpm but the flow rate should increase with rpm. I doubt the pressure valve would make a noticeable drop in fan speed. A pressure gauge added to the system might be interesting. You might try overfilling the steering fluid tank a bit. Maybe the pump is starving at higher rpm.
Did you add the turbo to the truck? Nice intercooler.
Did you add the turbo to the truck? Nice intercooler.
Just checked the FSM manual for ya.
This may be for the 3F pump not sure.
"Check that there is less than 5kg /cm (71 psi, 490 kPa) difference in pressure between the 1000 rpm and 3000 rpm checks.
If the difference is excessive, repair or replace the flow control valve of the PS pump"
Could be you have a bad flow control valve. It is located inside where the hard line bolts up. Let us know how you make out.
This may be for the 3F pump not sure.
"Check that there is less than 5kg /cm (71 psi, 490 kPa) difference in pressure between the 1000 rpm and 3000 rpm checks.
If the difference is excessive, repair or replace the flow control valve of the PS pump"
Could be you have a bad flow control valve. It is located inside where the hard line bolts up. Let us know how you make out.
That's the first one of those I have ever seen.. Cool 
As posted above, Flow/psi should be regulated by the pump pretty well. I cannot see any reason why the fan would slow with higher RPM's.
Does the fan slow when you steer the truck as well?
Is that a diesel specific thing?
I had no idea they were as common as they apparently are.. VERY cool.
Is the pump system dumb? Meaning does it just flow whatever the PS pump puts out? Or is there some sort of valve that is regulated mechanically or by a computer of some sort? Apparently there actually are commonly inverse-acting proportional pressure control valves used in this type of system. And that may be what you are seeing. If it is a mechanical or computer controlled system, what you may be experiencing is the speed of the fan is designed to vary with engine temp, so if the coolant temp is transferring through the radiator at a faster rate when you add rpm's it may not get as hot as it was at idle. So the fan would run slower. Course I am really talking out of my butt on this one since I have not seen a setup like that ever on a LC.
BTW, nice ferd parts
More details of your setup would be cool
As posted above, Flow/psi should be regulated by the pump pretty well. I cannot see any reason why the fan would slow with higher RPM's.
Does the fan slow when you steer the truck as well?
Is that a diesel specific thing?
I had no idea they were as common as they apparently are.. VERY cool.
Is the pump system dumb? Meaning does it just flow whatever the PS pump puts out? Or is there some sort of valve that is regulated mechanically or by a computer of some sort? Apparently there actually are commonly inverse-acting proportional pressure control valves used in this type of system. And that may be what you are seeing. If it is a mechanical or computer controlled system, what you may be experiencing is the speed of the fan is designed to vary with engine temp, so if the coolant temp is transferring through the radiator at a faster rate when you add rpm's it may not get as hot as it was at idle. So the fan would run slower. Course I am really talking out of my butt on this one since I have not seen a setup like that ever on a LC.
BTW, nice ferd parts
More details of your setup would be cool
With an A-H attitude like that you know what you can do with your question. Had you posted pictures from the start then folks wouldn't had to guess what the heck you were talking about.
masters do not think but they create things so read my question again.
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- #20
That's the first one of those I have ever seen.. Cool
As posted above, Flow/psi should be regulated by the pump pretty well. I cannot see any reason why the fan would slow with higher RPM's.
Does the fan slow when you steer the truck as well?
Is that a diesel specific thing?
I had no idea they were as common as they apparently are.. VERY cool.
Is the pump system dumb? Meaning does it just flow whatever the PS pump puts out? Or is there some sort of valve that is regulated mechanically or by a computer of some sort? Apparently there actually are commonly inverse-acting proportional pressure control valves used in this type of system. And that may be what you are seeing. If it is a mechanical or computer controlled system, what you may be experiencing is the speed of the fan is designed to vary with engine temp, so if the coolant temp is transferring through the radiator at a faster rate when you add rpm's it may not get as hot as it was at idle. So the fan would run slower. Course I am really talking out of my butt on this one since I have not seen a setup like that ever on a LC.
BTW, nice ferd parts
More details of your setup would be cool
the fan speed difference is significant but i need to add that my pump is off toyota 22 R engine . My guess is that there is a mechanical check valve inside the pump where at low rpm, it pushes max pressure so you could turn the wheel but at higher rpm( cruising speed) it goes lower pressure cause you do not really need the pressure to steer therfore, the pump could spine faster and without load. whatever the case is, my fan is detecting this differential pressure cause it runs with the oil leaving the gearbox.
This is turning in to an extra temp difference when I am moving up hills cause my fan is not turning fast enough to drop the temp. Not over heating yet but I know it may do it in summer.