Jeep Garage  - Jeep Forum

Jeep Garage - Jeep Forum (http://www.jeepgarage.org/forums.php)
-   Grand Cherokee - WK2 - (http://www.jeepgarage.org/f73/)
-   -   Question-elect steering (http://www.jeepgarage.org/f73/question-elect-steering-24787.html)

Jeepdewd 06-22-2011 03:58 PM

Question-elect steering
 
I have a JGC- overland set to arrive at dealership 2011 (Id imagine it was just built) does it have the new steering or the hydro? its a v6

Cherodude 06-22-2011 06:10 PM

Re: Question-elect steering
 
The steering will certainly not be fully electric. The 2012 models are supposed to be equipped with electro-hydraulic system (i.e. the pump is electric, instead of belt driven). AFAIK the electric pump did not make it into the 2011 models, although it was once supposed to be introduced about mid-Fall 2010.

See this old thread:
http://jeepgarage.org/showthread.php...859#post313859

Maybe someone has info about when the electric pump will make it to the assembly line.

xj31 06-26-2011 11:30 AM

Re: Question-elect steering
 
It made it a while ago.
http://i828.photobucket.com/albums/z...1/IMG_0938.jpg

josef15111 06-26-2011 11:57 AM

Re: Question-elect steering
 
now all they have to do is the waterpump and the ac pump. i bet the engine would be a little peepier withot the draw back of theses pumps. and you could cruise with the ac on and still have full power all times..

Cherodude 06-26-2011 02:06 PM

Re: Question-elect steering
 
As xj31's photo shows the electric pump has made it into production.

It is also shown in the Parts Manual for the wk2 described in other recent threads by Milous:
Hydraulic pump in Figure 19-505; Electric pump in Figure 19-506

xj31: what was your build date? Thanks.

ColdCase 06-26-2011 02:11 PM

Re: Question-elect steering
 
Something needs to supply the electricity, additional load from the alternator. Dunno how the efficiency works out but I would guess the hydraulic pump off a pulley is more efficient that first the conversion to electric power and back to hydraulic pressure. There may be other advantages of the electric pump, however. ..

Lingohocken 06-26-2011 04:00 PM

Re: Question-elect steering
 
If anyone here has the new electro-hydraulic configuration, how does steering "feel" fare? Straight electric power steering usually comes of as numb.

77Cherokee 06-26-2011 04:12 PM

Re: Question-elect steering
 
My wife's '10 Malibu has full electric steering. Below 50 mph it is fine. Above that, if you just touch the wheel the car lurches to either side. At 70, there is a long learning curve. Way too sensitive. Electric steering is the only complaint I have with the car. I am hoping the electric-hydro on the GC is much better. :worried:

xj31 06-26-2011 04:40 PM

Re: Question-elect steering
 
Cherodude - Thats not mine. I work at a dealer.That picture was taken back around March.It's been out for a while.

Coldcase - The electric is way more efficient. Main reason is that it is only active when it is needed.Like low speed turns. A hydraulic pump is always a load on the engine,even cruising down the highway,when you don't need it. It's not as much of a load as it is when you are parking,but it's still a load.
As far as feel,if you never opened the hood,you wouldn't know the difference.It's not at all like a full electric system.It uses an electric motor instead of a belt to drive the power steering pump,if you really want to simplify things. I only have limited experience with full electric steering.I also work on Fiats,and they use an electric motor on the steering column to help turn the shaft, and it actually has a manual rack and pinion. I was told that it is the same system that GM uses and it has a different feel to it.It's too light,you really feel out of touch with the car,especially at higher speeds.The Jeep has a hydraulic rack and pinion,not much different from what has been around for years.

ColdCase 06-26-2011 07:44 PM

Re: Question-elect steering
 
Quote:

Originally Posted by xj31 (Post 437880)

Coldcase - The electric is way more efficient. Main reason is that it is only active when it is needed.Like low speed turns. A hydraulic pump is always a load on the engine,even cruising down the highway,when you don't need it.

So you are saying there is no power assist on the highway, just arm muscle?

Have you done the math to determine how efficient is the alternator is making up the extra juice? Wouldn't the alternator need to be bigger and therefor always placing more load on the engine (the engine is idling pretty slow in slow speed turns where you need the most turning power). Isn't the electric motor driving the pump weigh more than the extra pulley and couple inches of belt needed to run off the accessory belt. Thats extra weight the car has to always carry around. Just saying I just don't think the electric/hydraulic steering system is as efficient as you may think.

The engine can be more responsive with less rotational inertia to deal with, however, especially when driving in a straight line.

xj31 06-27-2011 07:58 AM

Re: Question-elect steering
 
Quote:

Originally Posted by ColdCase (Post 437960)
So you are saying there is no power assist on the highway, just arm muscle?

That's pretty much correct.

Quote:

Originally Posted by ColdCase (Post 437960)
Have you done the math to determine how efficient is the alternator is making up the extra juice? Wouldn't the alternator need to be bigger and therefor always placing more load on the engine (the engine is idling pretty slow in slow speed turns where you need the most turning power). Isn't the electric motor driving the pump weigh more than the extra pulley and couple inches of belt needed to run off the accessory belt. Thats extra weight the car has to always carry around. Just saying I just don't think the electric/hydraulic steering system is as efficient as you may think.

I didn't design it, so I didn't have to do the math. But there are people who did,and I'm pretty confident that they knew what they were doing.The weight difference is probably not a factor on a vehicle that weighs around 2 tons.Its about fuel efficiency.That's the bottom line.You can read a little about it here, if you are interested.
http://www.infineon.com/cms/en/produ...fety/ehps.html

Quote:

Originally Posted by ColdCase (Post 437960)
The engine can be more responsive with less rotational inertia to deal with, however, especially when driving in a straight line.

That's exactly right,and that translates to greater efficiency

Andrew Klossner 06-27-2011 01:54 PM

Re: Question-elect steering
 
Quote:

Originally Posted by ColdCase (Post 437960)
Wouldn't the alternator need to be bigger and therefore always placing more load on the engine?

The torque required to turn an alternator increases with current draw. If no current is drawn at all, it spins pretty easily. I haven't done the math either, but taking a constant-load pump off the belt and adding an occasional load to the alternator makes sense.


All times are GMT -5. The time now is 11:00 AM.

Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community