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Old 02-25-2011, 03:17 PM   #1 (permalink)
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Default Awesome new cheaper alternative to diff lockers! (that I thought of all by myself!)

O.K. let me start by saying, I may be WAY off with this one, but here it goes...

If anyone on here has ever driven an old tractor (like the common ford 8n or 9n's) with separate brakes for each rear tire, you might already know where I'm going with this. Even though those tractors are only 2wd with open diffs, you can make them perform very well because if one tire loses grip, you can just press on the brake for that tire and the power will be forced to go through the diff to the other tire which has grip. As soon as you start to move again you can release the brake on the one tire and just continue on normally.

So, I was thinking today I wish the samurai had a system like that because then diff lockers wouldn't be needed. It would be a little more complicated because to make the most of it you would want to be able to do that on both axles, instead of like the tractors which only had one driven axle to worry about.

SO... Here is what I came up with, I have no idea if it would work or not but hear me out... Everybody knows what line locks are, right? Well, I'm thinking what if I put one on each wheel, then if I have one tire that is spinning or up in the air, I can just lock it out causing the power to go to the other side.
Another option would be like a hybrid system with a line lock on each front wheel, and get a second parking brake and hook one parking brake to each rear wheel to handle them.

What do you guys think? Has anything like this ever been done?

Last edited by sohcneondriver; 02-25-2011 at 03:19 PM.
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Old 02-25-2011, 04:05 PM   #2 (permalink)
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Yes - it's called fiddle brakes.
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Old 02-25-2011, 08:51 PM   #3 (permalink)
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Back in the day my buddy and I rigged a dune buggy style VW to do what u are talking about.
The rigging for the 2 handbrakes was simple enough and worked good for corners and all that...
If you plan to drive this 4x4 rigged like that...hope that you do NOT need to have any type insurance or road inspection.
It should work as u describe but likely will be VERY quirky.
Don't test in or on any uneven ground...test it carefully at first.
Did u think about the slowing of the braked wheel...taking energy from your total output ?
Remember line locks fade quickly.
Cheaper lockers are achieved with welders. They are not near as quirky as you might think. Many of us have run years with welded diffs.
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Old 02-26-2011, 10:45 AM   #4 (permalink)
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Well, with my limited funds my only two options for diffs are basically open or welded. I would be fine with welding them if I thought it would always be better. The thing that worries me is if sometimes, like in shallow mud or maybe snow or ice or something like that, is if it would want to push me straight foreward and not want to steer. Does anyone with welded diffs or solid spools ever have problems with that?
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Old 02-26-2011, 11:35 AM   #5 (permalink)
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It will work in the rear, but it is normally done with the e-brake cables. I wouldn't try it up front...
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Old 02-26-2011, 11:43 AM   #6 (permalink)
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Quote:
Originally Posted by sohcneondriver View Post
...to push me straight foreward and not want to steer. Does anyone with welded diffs or solid spools ever have problems with that?
welded diff, spools, same effect - pushes forward, yes.
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Old 02-26-2011, 01:16 PM   #7 (permalink)
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thats actually what modern dynamic traction controlled vehicles do. The simulate a limmited slip differential by progressively applying braking resistance to one wheel when it starts to break loose and spin significanly faster than the other wheel. They use onboard computers to control it though, not manual brake controls.

So even though your theory is not actually a breakthrough, it is something that isn't commonly done with manually controled braking systems. It's essentially what a clutched LSD does automatically. I don't know how you could automate it externally though. would be something interesting to brain storm about.
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Old 02-26-2011, 05:12 PM   #8 (permalink)
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Quote:
Originally Posted by Baratacus View Post
It's essentially what a clutched LSD does automatically.
Since when does a clutched LSD brake one wheel to force more power to the other?

A clutched LSD partially locks the drive shafts to one another so that some percentage of the power (how much will depend on the clutch packs) will get to both wheels - there is NO braking action going on.
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Old 02-26-2011, 05:25 PM   #9 (permalink)
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Interesting...
If an LSD is installed in back, slightly applying the emergency brake will lock up the LSD enough to act as a locker.

Interesting how things come around...
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Old 02-26-2011, 08:32 PM   #10 (permalink)
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Quote:
Originally Posted by fordem View Post
Since when does a clutched LSD brake one wheel to force more power to the other?

A clutched LSD partially locks the drive shafts to one another so that some percentage of the power (how much will depend on the clutch packs) will get to both wheels - there is NO braking action going on.
I didn't mean that an LSD applies the wheel brakes for you. I mean that it automatically (through use of the springs and clutch pack in the LSD case) applies enough resistance to the side gears in the differential so that the two axel halves remain turning at the same speed even if there is a difference in resistance from the two wheels. He is in effect manually mimiking this by applying the brakes to the unloaded side by creating an artificial load on that side.
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