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Lets talk dual power steering pumps vs aux. electric PS pump



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Old 05-16-2013, 02:50 PM   #1
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Lets talk dual power steering pumps vs aux. electric PS pump

Ive been pondering running dual powersteering pumps on my rig. Engine is a 4.3L with the AC compressor deleted. I plan on mounting the pump in this empty space...somehow.

I am wanting to run my full hydro but change the vacuum brakes to hydroboost. One pump for each system. Separate coolers and separate reservoirs. Probably the stock reservoir for the brakes and the huge one I currently run for my steering. Ive done some research and cant find enough info on dual pumps. KOH rigs run them just in case one goes out, they still have one to run the steering, but I want to run them for two entirely different systems.

To throw a wrench in things, what if I source an electric power steering pump and remote mount it to run the brakes?? Anyone know of a pump that could handle something like this? I believe a toyota MR-2 runs an electric pump for its powersteering. This may be enough to run the hydro brakes.

This is all assuming the stock astro van pump I am running cant handle both tasks. Would it be better to upgrade to a PSC race pump with a higher PSI output and run both systems?

Im running a D60/14B with 3/4 ton chevy brakes on each corner with a stock toyota brake booster and 1-ton master cylinder. The brakes are less than stellar (the weight of 44s and H1s have something to do with it), plus I blew the booster out. It hisses at me from iinside the cab so I know its out. I have a dual-diaphragm booster out of a turbo toyota truck on the workbench ready to install in its place. Its a smaller diameter than other toy DD boosters so it can clear the steering u-joint that comes out of the firewall on first gen yotas.

This is something that I have been pondering during my time offshore. Not much else to do in the downtime on the boat.

So good idea? Stupid idea? Wont work? Will i kill a bus full of nuns? What is everyone else running with tons to have good to great brakes? i will have close to 6:1 low/low range with an automatic and it drives through the brakes currently with 4.7 low range.

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Old 05-16-2013, 03:53 PM   #2
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Try running the new booster first without any other mods and see what you think. My fj40 with 1tons was running a mini truck booster and I was less than impressed. I switched to a larger booster from another toyota(don't know what model) and the brakes are much better.

I'm also running 1tons in my fj80 with a sky adapter for the larger Chevy master cyl and it will launch you through the windshield. If the dual booster you have doesn't work that great look into finding an fj80 model booster. Good luck and let us know how it works.
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Old 05-16-2013, 04:19 PM   #3
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I have attempted to stuff a fj-80 dual diaphragm booster in my first gen with no luck. I beat the hell out of the seam so the booster would clear the steering joint at the firewall but it wouldnt clear. It ended in a broken beat to **** booster that wasnt any good anymore.

I am going to try the turbo booster first (same diameter as my first gens, but dial diaphragm) and see how that goes before trying the other ideas. I was just wondering if this has crossed anybody's mind?

Anyone running hydroboost? What system di they go with? Junkyard or aftermarket? I like the Vanco stuff. Pretty slick stuff.
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Old 05-16-2013, 06:29 PM   #4
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I used a hydo boost and master cyl of a 99 ford PS. Worked like a champ and one pump runs it fine. I did have to run two return lines to git rid of a problem.
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Old 05-16-2013, 06:34 PM   #5
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Did you run hydro as well?
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Old 05-16-2013, 06:46 PM   #6
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It may be a yota thang..but I can lock up all 4 tires very easily..full hydro steering, stock non-hydro brakes..
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Old 05-17-2013, 09:30 AM   #7
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Originally Posted by the_white_shadow View Post


To throw a wrench in things, what if I source an electric power steering pump and remote mount it to run the brakes?? Anyone know of a pump that could handle something like this? I believe a toyota MR-2 runs an electric pump for its powersteering. This may be enough to run the hydro brakes.

As far as I know most if not all EPS systems are computer controlled, usually in concert with the ABS module. This is because they do not run full power all the time, the CU uses signals such as vehicle speed, steering angle, and g-forces to calculate how much assist is necessary.


The only time a typical car needs power steering is low speed tight manuvering like parallel and mall parking. Above 20mph there is basically no assist unless ABS detects emergency manuvers.

This is all done to increase gas mileage by reducing engine load. A hydro pump runs all the time an electro pump does not.

If it is possible to wire a EPS to stand alone it would probably run all the time and burn itself out quickly. Plus they draw a lot of amps (20-50) when running full assist, that would put a heckuva load on your electrical system.
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Old 05-17-2013, 09:35 AM   #8
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Quote:
Originally Posted by the_white_shadow View Post


To throw a wrench in things, what if I source an electric power steering pump and remote mount it to run the brakes?? Anyone know of a pump that could handle something like this? I believe a toyota MR-2 runs an electric pump for its powersteering. This may be enough to run the hydro brakes.

As far as I know most if not all EPS systems are computer controlled, usually in concert with the ABS module. This is because they do not run full power all the time, the CU uses signals such as vehicle speed, steering angle, and g-forces to calculate how much assist is necessary.


The only time a typical car needs power steering is low speed tight manuvering like parallel and mall parking. Above 20mph there is basically no assist unless ABS detects emergency manuvers.

This is all done to increase gas mileage by reducing engine load. A hydro pump runs all the time an electro pump does not.

If it is possible to wire a EPS to stand alone it would probably run all the time and burn itself out quickly. Plus they draw a lot of amps (20-50) when running full assist, that would put a heckuva load on your electrical system.
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