Re: [AMC-list] Electric Power Steering

[Jim Blair <carnuck@xxxxxxxxxxx>]

What's wrong with modern manual steering?




From: adh@xxxxxxxxxxxxxxxxx (Sandwich Maker)

To: amc-list@xxxxxxxxxxxxxxxxx
Subject: Re: [AMC-list] Electric Power Steering
Message-ID: <201204251332.q3PDWih15078@xxxxxxxxxxxxxxxxx>

" From: Jesse <j2sax@xxxxxxxxx>
" 
" There are LOTS of newer vehicles that have electrically boosted power
" steering as well as completely electronically controlled, electrically
" powered steering racks. Most of your later model GM mid size vehicles
" have them (06 and up) as well as many other vehicles available here.
" No need to pay over the pond shipping for something you could get here!

i expect hydro ps to become rare, if it isn't already. now that
york-style a/c compressors are a thing of the past, a ps pump is the
3rd biggest load on the engine after aero drag and drivetrain/road
friction. [which rules depends on speed - friction around town, aero
on the highway]

remember, the pump is pumping all the time keeping the system
pressurized, even when you're not moving the steering wheel. and it's
a fixed-displacement pump so it's always putting out full volume even
if the steering gear isn't using it, and it has to be sized big, to
supply the steering even at idle, like when parking.

a variable-displacement pump could approach electric ps for
efficiency, but not in cost or maintenance. electric ps isn't just a
newfangled gimmick.

semi-relevant factoid: the shuttle flight control system - the rudder
and ailerons and main-engine gimbals - were hydraulically actuated,
and the pumps took 400hp just to maintain working pressure.
________________________________________________________________________
Andrew Hay the genius nature
internet rambler is to see what all have seen

 		 	   		  
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