On demand power steering

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Jan 11, 2008 | 09:57 AM

kaboom10

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From: royal oak, mich

On demand power steering

Has anyone seen or given thought to an on demand power steering pump? Make it work like an A/C clutch. Anyone know what load is exerted on the engine from the pump when vehicle is at rest and trying to turn the wheels? How about at city driving speeds? I just don't care for the over responsiveness at times.

Kaboom10 2002 5.4L 4wd F-150 w/33k/miles<O

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K&N replacement filter w/modified air box<O

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EBC brakes all around<O

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Jan 11, 2008 | 10:52 AM

projectSHO89

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From: St Louis

That's what VAPS is for.

Jan 11, 2008 | 12:32 PM

kaboom10

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From: royal oak, mich

Was it an option or standard and on what years?Kaboom10 2002 5.4L 4wd F-150 w/33k/miles<O class=inlineimg title=\"Stick Out Tongue\" alt=\"\" border=\"0\" src="http://images.ford-trucks.com/forums/images/smilies/tongue.gif" <img /> </O class=inlineimg title=\"Stick Out Tongue\" alt=\"\" border=\"0\" src="http://images.ford-trucks.com/forums/images/smilies/tongue.gif" <img />

K&N replacement filter w/modified air box<O class=inlineimg title=\"Stick Out Tongue\" alt=\"\" border=\"0\" src="http://images.ford-trucks.com/forums/images/smilies/tongue.gif" <img /> </O class=inlineimg title=\"Stick Out Tongue\" alt=\"\" border=\"0\" src="http://images.ford-trucks.com/forums/images/smilies/tongue.gif" <img />

EBC brakes all around<O class=inlineimg title=\"Stick Out Tongue\" alt=\"\" border=\"0\" src="http://images.ford-trucks.com/forums/images/smilies/tongue.gif" <img /> </O class=inlineimg title=\"Stick Out Tongue\" alt=\"\" border=\"0\" src="http://images.ford-trucks.com/forums/images/smilies/tongue.gif" <img />

http://i48.photobucket.com/albums/f240/kaboom10/100_0165.jpg <O class=inlineimg title=\"Stick Out Tongue\" alt=\"\" border=\"0\" src="http://images.ford-trucks.com/forums/images/smilies/tongue.gif" <img />

Jan 11, 2008 | 01:13 PM

LxMan1

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From: Louisville,Ky.

I know Subaru used to have an electric power steering set up on the XT coupe. Worked ok until the motor went bad.
There should be little drag when the pump is idle. You contantly move the wheel more than you think when driving, so the clutch would constantly cycle and give no power gains until it burned out.

Jan 11, 2008 | 01:50 PM

kaboom10

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From: royal oak, mich

I guess the auto companies figure it ain't worth it. With all the computer control and fly by wire technology they could do something. Then again people don't like a computer driving for them. I think it was announced by GM they were gonna make a hands off car in ten years.

Kaboom10 2002 5.4L 4wd F-150 w/33k/miles<O class=inlineimg title=\"Stick Out Tongue\" alt=\"\" border=\"0\" src="http://images.ford-trucks.com/forums/images/smilies/tongue.gif" <img /> </O class=inlineimg title=\"Stick Out Tongue\" alt=\"\" border=\"0\" src="http://images.ford-trucks.com/forums/images/smilies/tongue.gif" <img />

K&N replacement filter w/modified air box<O class=inlineimg title=\"Stick Out Tongue\" alt=\"\" border=\"0\" src="http://images.ford-trucks.com/forums/images/smilies/tongue.gif" <img /> </O class=inlineimg title=\"Stick Out Tongue\" alt=\"\" border=\"0\" src="http://images.ford-trucks.com/forums/images/smilies/tongue.gif" <img />

EBC brakes all around<O class=inlineimg title=\"Stick Out Tongue\" alt=\"\" border=\"0\" src="http://images.ford-trucks.com/forums/images/smilies/tongue.gif" <img /> </O class=inlineimg title=\"Stick Out Tongue\" alt=\"\" border=\"0\" src="http://images.ford-trucks.com/forums/images/smilies/tongue.gif" <img />

http://i48.photobucket.com/albums/f240/kaboom10/100_0165.jpg <O class=inlineimg title=\"Stick Out Tongue\" alt=\"\" border=\"0\" src="http://images.ford-trucks.com/forums/images/smilies/tongue.gif" <img />

Jan 11, 2008 | 07:15 PM

Volfandt

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Electric power steering

My wifes 06 RAV 4 has electric power steering and it works surprisingly well.
It feels no different than a std hydraulic PS system with the added benefits of not robbing any engine power and taking up less space.
When I say electric PS I mean electrically assisted PS as the steering will work in an electric failure but like it's hydraulic counterpart it ain't easy.
The power steering module mounts behind the dash in the conditioned compartment which protects it from the elements and leaves very little clutter in the engine compartment.
I don't know how well it would work on larger heavier vehicles but it works very well in the compact SUV class.

I believe TRW makes the RAV 4 unit(s) but Delphi is a player also. http://delphi.com/manufacturers/auto.../electric/eps/

Another writeup, seems Ford & GM is starting to use it now also.
http://www.msnbc.msn.com/id/20696420/

Last edited by Volfandt; Jan 11, 2008 at 07:25 PM.

Jan 12, 2008 | 04:43 AM

LxMan1

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From: Louisville,Ky.

Sill more load on the alternator. They keep adding electrical stuff to these vehicles and you will have to have a small power station in the bed to run everything.

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Jan 12, 2008 | 08:56 PM

TowABoat

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From: Waterford, MI

Quote:

Originally Posted by kaboom10

Might as well put a small hybrid engine in the bed to run it all. It's feasable as we did one for a golf cart(although a bit ridiculous).

Elecric power steering is becoming quite common. It was on the Acura NSX early on, then the Honda S2000, of late in the Saturn Vue (w/V6) and the 2008 FORD Escape, among many others. Ford is saying 80 to 90 percent of its vehicles will have it in the next four years...which probably means that new F-Series truck for '09 that they're showing next week at the Detroit auto show is in line for it.

More common in Europe (Fiat and Peugeot use it a lot) and the fuel economy gain, on average, is 1 mpg. So if you're wondering what your parasitic loss is on a hyrdaulic system, it's in the neighborhood of 1 mpg.

This continuing electronic and electric load on the system is why a 42-volt system has been touted for the near-term future. Probably see two different circuits...a 12 volt (really 14) for the engine and 42v for all the accessories.
Kevin W.
1991 F-150 XLT Lariat 4x2 standard cab/long bed
4.9-liter six/Mazda 5-spd
Michigan

Jan 12, 2008 | 09:30 PM

#10

Silver Streak

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From: Broken Arrow, OK

42 volts isn't new, GM has used it on their hybrid trucks since they were introduced. They do use two separate electrical systems. The 42 volt side will electrocute you in short order. There are lots of special steps to working on those systems and the first one that rolls into my shop will mark my last day on the job and the boss knows it. I'm sick of relearning the trade every couple of years.