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Topic Review (Newest First)
05-03-2012 11:55 AM
lee indy
Quote:
Originally Posted by Cons_Table View Post

4WD is kind of hard to explain, but its nothing to be scared of. Just think of it this way, if there is a loose surface, it is safe to use your 4WD.
and if you get stuck then. lockers.

clear as mud yet
05-03-2012 11:34 AM
Cons_Table
Quote:
Originally Posted by Con Artist View Post
Okay, lemme make sure I understand correctly. 4WD just means that power is sent to all 4 wheels, so in other words, IF i wanted to (not that I would...), I could drive on dry pavement because there would still be a differentiation because the wheels would be spinning at different speeds (inner and outer wheels), but with the lockers engaged I would have to be on a slippery surface...
Nope lol...

Lets say your jeep has open differentials in the front and the rear of the jeep. When in 4wd drive (and 2wd) your jeep will send power to the wheel with the LEAST amount of resistance. For example, if you were driving in 4WD and you had your driver rear and driver front tire on ice, and then had the passenger front and passenger rear on asphalt, which surface would provide the least amount of resistance? In other words, what tire would have less traction? The ice. So in this scenario, your driver side tires would be receiving all of the power and the passenger side tires would do nothing. We will call this "wheel slip." When you make turns in 2WD with open differentials, the wheels are allowed to spin at different speeds. Understand so far?

Now lets say your jeep is equipped with Limited Slip differentials. We will put you in the same scenario...4WD, ice on the driver's side, asphalt on the passenger side. With the limited slip, as you drive across your driver side wheels will want to start spinning because there is less traction...just like before with the open differentials. However, there are certain components inside of the differential that cause it to engage when it feels the wheels slip. This allows the jeep to send some torque to the non slipping wheel. Power will not be evenly distributed between the slipping wheel and the non slipping wheel, but the non slipping wheel will receive more than if it were an open differential. Making turns in 2WD with a limited slip will be invisible and react just like an open differential would.

Now we will engage the lockers. Same situation...4WD, ice on the drivers, asphalt on the passengers. A locker will cause all the wheels to spin at the same speed no matter what. As you drive across the ice and the asphalt your driver tires will not slip at all like before. The jeep will continue to pull through since it will have traction available on the passenger side since the wheels are spinnin at the same speed regardless.

You mentioned if you were to use 4WD on strictly asphalt. Even with an open differential, this will not work. Think about what I said in the first section about open diffs. Power goes to the wheel with the least resistance If you are driving in 4WD on the asphalt, all 4 tires will have equal amounts of resistance, therefore the wheels will not be able to slip much...because everything is turning together and there is nothing allowing them to spin at different speeds.

4WD is kind of hard to explain, but its nothing to be scared of. Just think of it this way, if there is a loose surface, it is safe to use your 4WD.
05-03-2012 11:26 AM
Renaissance_Redneck
Quote:
Originally Posted by darkproximity View Post
The reason you wouldn't want to drive on dry pavement in 4wd
Right. And to the other question about the lockers..... be very careful using them, esp. using the front lockers on a slick surface. Your Jeep may simply go "where it wants to go", and you may not be able to steer properly; sending you into all kinds of nasty places. I use my lockers sparingly, often turning them on and off for short intervals, only when I need them for a specific obstacle. Only under very limited/rare circumstances to the lock-in for the duration of a maneuver (for instance, I'll lock-in when I'm in the snow, and the snow is deeply rutted by other tire tracks. Those ruts will keep me in line; the tires tend not to be be able to "jump" out of the ruts; so the lockers don't throw me around). I would not use lockers on the road, esp. when its slick.
05-03-2012 11:17 AM
darkproximity
Quote:
Originally Posted by Con Artist
Okay, lemme make sure I understand correctly. 4WD just means that power is sent to all 4 wheels, so in other words, IF i wanted to (not that I would...), I could drive on dry pavement because there would still be a differentiation because the wheels would be spinning at different speeds (inner and outer wheels), but with the lockers engaged I would have to be on a slippery surface...
The reason you wouldn't want to drive on dry pavement in 4wd is there is no differentiation between the front and rear tires, the drive shafts have to turn at the same speed. when cornering all the wheels have to turn at different speeds but in a part time 4wd system like Jeeps have, the front and rear driveshaft are locked to turn at the same rate.

The difference in awd systems and part time 4wd systems is, in awd there is another differential between the drive shafts, so they can spin independently from another
05-03-2012 10:36 AM
Con Artist Okay, lemme make sure I understand correctly. 4WD just means that power is sent to all 4 wheels, so in other words, IF i wanted to (not that I would...), I could drive on dry pavement because there would still be a differentiation because the wheels would be spinning at different speeds (inner and outer wheels), but with the lockers engaged I would have to be on a slippery surface...
05-03-2012 08:24 AM
lee indy
Quote:
Originally Posted by Con Artist View Post
There isn't a slip-differential in place during just standard 4WD is there?
a limited slip is different than a locker

a limited slip detects wheel spin and locks both sides.

a locker is selectable so you push the button/flip a lever and the axles are locked. no slipping

both do similar things but the locker is regarded as better because there is no wheel spin necessary to engage it.


not to confuse you more but there is a third type called a lunchbox which is different all together

for the sake of simplicity you have push button lockers coming on the rubi.

4 wd makes the all the wheels get some power.

locking and 4wd makes all the wheels get the same power.
05-03-2012 08:19 AM
lee indy
Quote:
Originally Posted by Con Artist View Post
I've actually watched that video counting on at least 10 times and still manage to be puzzled. I feel like I'm hopeless.

So what is the difference between "locked" and 4WD? Isn't 4WD basically the same thing; all wheels turning at the same time? There isn't a slip-differential in place during just standard 4WD is there?
youve got a rubicon coming so its a little more complicated being as you jumped right into the big girl.

4wd is all for tires turning but not nessesarily at the same speed. power will transfer to the side with the least resistance.

locking the axle will make both sides turn at exactly the same rate all the time. amazing amount of traction.

you definitely dont want to run lockers on dry pavement. as when you corner the inside wheel turns slower than the outside. thats why the lockers are selectable.

personally i run 2wd until i get stuck or start slipping. if youre new to jeeps. read on here no one will bust your balls to bad. join a local club. youll learn the ropes quick
05-03-2012 08:11 AM
GREEN-MACHINE unless you have locking Diff's your only sending power to 1 rear wheel and 1 front wheel. this is know as an open Diff.
when ever you are off roading you should be in 4lo ( unless its the dirt road to grandma's house )
4hi can be used on snow covered roads up to 50mph, ( do you really want to go that fast on snow covered roads )
yes you can use 4hi when driving to work on snowy roads, no you dont have to take it out of 4 wheel drive on corners.
climbing dirt\grassy hill's 4lo... why 4lo, it keeps your engine from over working itself and prevents overheating.
i hope this helps somewhat.
05-03-2012 07:59 AM
Con Artist
Quote:
Originally Posted by lee indy View Post
http://www.wranglerforum.com/f33/jee...wd-135183.html

this video will answer most your questions. long and short of it is 4wd is for anytime your in a low traction situation.
ice/snow = deffinately
gravel = sure
corners = no not on loose traction. you dont want to run locked or 4wd on dry pavement.

dont cancel your order. all the awd systems are crap
I've actually watched that video counting on at least 10 times and still manage to be puzzled. I feel like I'm hopeless.

So what is the difference between "locked" and 4WD? Isn't 4WD basically the same thing; all wheels turning at the same time? There isn't a slip-differential in place during just standard 4WD is there?
05-03-2012 07:52 AM
lee indy http://www.wranglerforum.com/f33/jee...wd-135183.html

this video will answer most your questions. long and short of it is 4wd is for anytime your in a low traction situation.
ice/snow = deffinately
gravel = sure
corners = no not on loose traction. you dont want to run locked or 4wd on dry pavement.

dont cancel your order. all the awd systems are crap
05-03-2012 07:42 AM
Con Artist
Feeling very intimidated about 4x4 operation...

I know there's probably a thread regarding how 4WD works and I've seen a thread on where to use it, but I'm still feeling very intimidated about determining when to use it.

Okay, so there's snow on the ground but I'm still getting some bite from the tires. Do I engage 4WD?

Let's say I'm just on a gravel path or loose rock. Can I engage it?

Can I drive to work on snowy roads in 4WD?

Do I need to disengage the 4WD when turning corners, given all the wheels turn at the same speeds? By running 4WD around corners, wouldn't axle-twist come into play?

Can I use 4WD climbing grassy or dirt hills?

I just have a lot of questions and I'm very apprehensive because I just don't want to damage something. I've actually gotten myself worked up to the point that I've thought about cancelling the order on my Jeep and just search for something with AWD.


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