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Old 10-18-2015, 02:56 PM   #9 (permalink)
oil pan 4
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Quote:
Originally Posted by OilFilter View Post
I've been a little confused about the power steering system. I know what kind of output the belt driven pump is capable of, but how much does the steering box actually use in terms of flow? I know there is a lot of talk about people converting to small electric hydraulic pumps for PS, but will that work on a truck? Does a truck steering box require too much power? (29" tires)
http://ecomodder.com/forum/showthrea...ing-29002.html

How much power does it take? I don't know but I am going to find out here pretty soon.

Quote:
Originally Posted by OilFilter View Post
Can anybody tell me what is actually required in terms of GPM? Is there any flow through the steering box when you are not turning? How much flow is required to make a turn? I would like to have some sort of hydraulic accumulator, I'm wondering if could run the steering from this for any length of time? I'm thinking part of the regenerative braking could be to recharge the hydraulic accumulator for the power steering.
A power steering pump found in Saginaw P1 and P2 pumps can make about 3gpm at idle and pump 15gpm in a P2 at 5,000rpm and 20gpm at 5,000rpm with a P1. Recirculating ball steering boxes work from 800psi to up to 1,500psi. From what I can find most OE setups are limited to less than 1,200psi.

A hydraulic accumulator will not work since the steering box bypasses fluid when there is no power assist needed to turn the wheel.
Don't believe me? Just pull the return hose off the power steering pump and start the vehicle and see what happens.
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