Why do I need a locker? I thought I had 4WD! - Page 4 - JeepForum.com

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post #46 of 78 Old 01-19-2011, 12:30 PM
DanZ51
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Quote:
Originally Posted by baritone_mike View Post
The braking trick is still used by the military. Does anybody know the actual name for the trick as I would like to read more about it and see if I can find a way to use 3 pedles with 2 feet.
It's called "Torque Biasing" or "Brake Biasing" it's taught for use in (only in the) HMMWVs due to the use of the Gleason Torsen differential in both front and rear diffs.

http://www.torsen.com/general/general_faq.htm


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post #47 of 78 Old 01-19-2011, 01:08 PM
danielbuck
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I asked this in another thread, but didn't get any answer. I'm still curious:

I've been kind of wondering this about when the front differential is open, which side has the tendancy to get more power?

I remember on my old truck, it had an open differential in the rear, and when going forward it seemed like the passenger side (if I remember correctly) always got more power (peg-leg burnouts, haha!) and when going in reverse the, the opposite side would get more power.

Why is this? Is it because the rotation directon of the driveshaft puts more torque onto one side of the vehicle than the other? (like when dragrace cars pull up one wheel higher than the other when they launch, kind of "twist" the car a bit?)

Would an open front differential have a tendancy to put more power on one side than the other like this as well? If so, which side would it be? Just a curiosity, really.
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post #48 of 78 Old 01-19-2011, 01:21 PM Thread Starter
Jerry Bransford
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Read the sticky I wrote at the top of the general off road and equipment forum that discusses torque. http://www.jeepforum.com/forum/f27/4...nswers-130169/

No matter what the traction is like, an open differential and a limited slip differential always splits the torque 50:50. Before asking a lot of additional questions on what I just said, please do read that sticky first. It goes into a lot of detail on this very subject.

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post #49 of 78 Old 01-19-2011, 01:55 PM
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Great stuff Jerry,cleared up some questions i'd always had!!
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post #50 of 78 Old 01-19-2011, 03:58 PM
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Quote:
Originally Posted by MeltdWhiskey View Post
here's a good video that may help explain what's going on..

http://www.youtube.com/watch?v=kJY9SxDOTog


you may want to skip ahead to the 2.5 min mark ..thats' where the good stuff starts

That's a pretty cool video. Now I know what to do with my old Tinker Toys.
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post #51 of 78 Old 01-19-2011, 04:38 PM
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Quote:
Originally Posted by Jerry Bransford View Post
Read the sticky I wrote at the top of the general off road and equipment forum that discusses torque. http://www.jeepforum.com/forum/f27/4...nswers-130169/

No matter what the traction is like, an open differential and a limited slip differential always splits the torque 50:50. Before asking a lot of additional questions on what I just said, please do read that sticky first. It goes into a lot of detail on this very subject.
Nice write up! But I'm still a little confused as to why when in 1st gear going forward one side of the rear would always be the one to loose traction, and when in reverse the opposite tire would loose traction. I forget which side was wich (this was years ago) But I do remember that it switched depending on if i was in a forward gear, or reverse. This was a GMC Sierra pickup truck, with an open differential (or at least, I'm pretty sure it was open) Is it because the rotational motion of the driveshaft was shifting the weight of the truck a little bit towards one side, and then in reverse it shifts it the other way?
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post #52 of 78 Old 02-18-2011, 04:02 PM Thread Starter
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Likely due to weight transfer and engine torque rolling the jeep body towards the right rear tire during hard acceleration. That places more weight onto the right rear tire which can unweight the left rear tire. There is a similar weight distribution shift but from the front to the rear during hard acceleration. Beyond that, the differential does truly split the torque 50:50 every time to the left and right wheels.

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post #53 of 78 Old 11-23-2011, 08:01 PM
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I have a question that I cant find an exact answer for. For the foreseeable future, most of the wheeling I would do might be during hunting. Sometimes its dry, sometimes its snowy, and everything in between. I understand that a lunchbox type locker has negative affects on driving behavior on roads at speed, but how do they act when off road in the varying conditions mentioned. Also the top speed probably isn't above 20mph. Are the affects less prominent, or are they the same as on road?

Edit: I want to clarify that I'm thinking about putting one in the front diff

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post #54 of 78 Old 11-23-2011, 09:09 PM
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I guess I am surprised by how many didnt know about braking for traction. I uaed to wheel a jeep woth a full spool in the rear and arb in the front. The current jeep is open in the front and if it has a limited slip in the rear its dead. I have been learning all kinds of basics all over again. Use of brakes for traction has been pretty common.
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post #55 of 78 Old 11-23-2011, 09:41 PM
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any tips for manual tranny's.

I tried doing this with my jeep when i was in some dirt with some spinning wheels but it was too easy to stall trying to negotiate all three peddles.
Does your parking brake work?.

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post #56 of 78 Old 11-24-2011, 11:32 AM Thread Starter
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Quote:
Originally Posted by Bojon View Post
I have a question that I cant find an exact answer for. For the foreseeable future, most of the wheeling I would do might be during hunting. Sometimes its dry, sometimes its snowy, and everything in between. I understand that a lunchbox type locker has negative affects on driving behavior on roads at speed, but how do they act when off road in the varying conditions mentioned. Also the top speed probably isn't above 20mph. Are the affects less prominent, or are they the same as on road?

Edit: I want to clarify that I'm thinking about putting one in the front diff
Offroad, a front locker is unnoticeable 99% of the time. They can slightly increase your turning radius on a very tight turn but that's about it.

Does your CJ have manual or fixed hubs?

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post #57 of 78 Old 11-24-2011, 05:25 PM
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Originally Posted by Jerry Bransford View Post
Offroad, a front locker is unnoticeable 99% of the time. They can slightly increase your turning radius on a very tight turn but that's about it.

Does your CJ have manual or fixed hubs?
I have the manual hubs on it. So offroad the tendency for the locker to slide on off camber roads really doesnt apply?

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post #58 of 78 Old 11-24-2011, 07:18 PM Thread Starter
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Your CJ is different from a TJ so what applies to a CJ doesn't necessarily apply to a TJ. With your CJ's manual hubs, you can make the front locker a non-event when on the paved highway by disconnecting the hubs. Same with a locker's tendency to cause the axle it's installed in to tend to slide down torwards the low-side of an offcamber trail... unlock your hubs and the issue goes away with a front locker. With a TJ, all you need to eliminate either problem with a front-mounted locker is to simply shift back into 2wd.

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post #59 of 78 Old 11-24-2011, 11:53 PM
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I appreciate your comments Jerry, I think I'm gonna order myself a locker, and see how I like it! I cant find the Aussie anywhere, so that puts it between the lockright, or the Spartan. Leaning towards the Spartan since it includes the hardened cross pin

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post #60 of 78 Old 11-25-2011, 08:25 AM Thread Starter
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The Lockright includes the hardened cross pin too.

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