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| Limited Slip Diffs; The "fix" for steering woes? | |
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| Topic Started: Apr 4 2006, 12:44 AM (2,044 Views) | |
| outcastrc | Apr 4 2006, 12:44 AM Post #1 |
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I have a plan and I would like others to join me in doing some tests. First we all know that the blizzard brakes are too powerfull for their own good. There are ways of course to correct this. But I have a plan! The diff looks to be a normal sealed diff. If I was to put diff lock oil into it it would become a limited slip. This is a good thing because it will do two things: First the tracks will want to run together. Unlike stock where the track with more friction looses to the other. Second when you do apply the brakes the diff will tame them down because it will be harder to spin out. This should give us better turning abilities. So this is what I would like to ask everybody thats interested to do. Get into that diff and get some oil in there. Run it and post your results. With a bit of testing we should be able to figure out a zone of limited slip diffs that make the blizzrd behave like we would like it to. |
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| outcastrc | Apr 4 2006, 01:44 AM Post #2 |
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And just to let everybody know getting the diff out is so simple its sad really. Remove the 2 screws on the front plate (or remove all 4 and put the plate aside like I did). Then remove the brace screws from the sides at the diff end and the center of the chassis.  This will give you enough play to pop the brakes out of the diff. Everything stays in one piece so its easy to remove     Open the diff up and say ew to the aluminum diff gears and great job of greasing the diff. (I'm being very sarcastic here)    Add your diff lock oil until it covers the shaft. While your add it add some grease to your diff case. Shake your head again at the rtr builders adacity to not grease your diff!  Pop you diff back in and screw the 8 screws to hold everything together. And then go check it out! |
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| outcastrc | Apr 4 2006, 01:53 AM Post #3 |
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Tech notes: Oil 120,000 Verdict: Just on a quick run on the carpet its showing 1000x better driving attributes. It drives straight ahead with zero wandering tendancies. Brakes work just fine, it has no trouble steering. Steering responce is WAY better then before. The brakes do not behave anywhere near as finnicky. I still would like to soften the brakes up but its not a problem like it was. I found it much easier to get the Blizzard around obstacles that I was over steering before. Score: 10 outa 10!!! 
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| spoon37 | Apr 4 2006, 06:07 AM Post #4 |
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does it Retain Diff Lock Lube?
 most gear diffs wont retain all liquid unless designed from the ground up to do so....I'll have to look at mine, I ran it yesterday its still running good but I dont wanna wear out the diff if it needs more lube, I dont have any diff lock lube, I normally use either Tamiya White Lithium grease(soft) or Tamiya AW grease(Hard/stiff but pricey), I might try the AW grease see if it helps...its so stiff its almost solid... 
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| outcastrc | Apr 4 2006, 11:11 AM Post #5 |
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It doesn't have orings or anything. Its not that sealed, but it is enclosed... 120k is like taffy. I have a hard time seeing it escape. |
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| outcastrc | Apr 8 2006, 11:36 PM Post #6 |
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I have a few packs thru it now and all I can say is it should come this way stock!  I have a much easier time getting gradual turns when I am braking. I can still spin on a dime as well if I want. So it didn't hamper the turn on a dime ability. It tracks straight with no effort, where before it needed the brakes balanced really well so it wouldn't pull to a side. I believe this mod gets you 1/2 way there. With some simple brake mods to smooth them out I can see the Blizzard becoming a very tame turner. While still having the ability to lock up at will. |
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| spoon37 | Apr 11 2006, 12:09 PM Post #7 |
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Well I've got the diff filled up with Tamiya AW grease today whilst I was retro-fitting the thing with ballrace bearings.  I havent managed to run it yet, mainly due to the rain and the fact I didnt get it back in one piece till nearly 8pm.... but it does feel much more firm when turning the tracks over by hand; hopefully I can run it tomorrow and let you all know how this one works. just so you know AW grease is a really heavy high viscous grease - so stiff its actually tough to squeeze it outta the tube it comes in... should have a similar effect to the taffy-esque 120,000wt oil... 
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| spoon37 | Apr 13 2006, 08:18 AM Post #8 |
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Hey, just ran it! good stuff! this seems to have similar results to OC's 120,000wt oil, the AW grease gets it about halfway, much less sensitive to steering inputs but it can still lock em up real tight when need be. I did think there was a problem towards the end of the run but it was just the fact the crappy maxx pax 1900 was running out of juice and could barely turn the diff over when steering! :lol: IMO stiffening up the diff like this whichever method you use it definetly worth it!! I also used ball bearings, which seems to have freed it up a great deal, its a lil faster and smoother. oddly with the BB's and the stiffer diff it does sound louder not quieter especially when turning, but thats ok... here's what I used in case anyone is in any doubt: |
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| WhiteWolf McBride | Apr 15 2006, 05:00 AM Post #9 |
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Making Trax!
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You two... You realise you're just become illegals, right? Cooking up batches of LSD in yer workshop? For shame... If ya don't get it, you ain't old enough, just ask us ancient ones what we're talking about... if ya dare. By the way OC, where's ya get your 120 thou taffy? And whats the going rate on it? I may wanna try it before I go whole-hog on my TLT. Easier to clean the diffs and full-lock 'em than clean off the JB Weld after the fact. Glad his DX dun have no stinkin diffs... |
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WhiteWolf McBride CEO, TaskForce Technologies Inc. Ottawa, Canada | |
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| spoon37 | Apr 15 2006, 06:14 AM Post #10 |
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:lol: no LSD here honest gov.... 
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| outcastrc | Apr 15 2006, 10:52 AM Post #11 |
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LOL OFNA diff lock should be available at any lhs. In thicknesses from 1000 - 120,000. You can also get Team Associated 300,000 (never tried that thick before) |
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| spoon37 | Apr 15 2006, 02:17 PM Post #12 |
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yeah but for that one you have to cut it with a kife and push the diff components into the block of 'oil' you've just cut out! :rofl:
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| outcastrc | Apr 15 2006, 02:51 PM Post #13 |
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Pretty much. The 120 is thick enough to blow out the cap if your not careful. (Guess how I know)
 It takes a while to fill a diff. You pour a drop onto the diff, they go have coffee to let it ooze down the gears, do it again 2-3 times and your done... I can't imagine how 300k would be like. |
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| spoon37 | Apr 16 2006, 10:19 AM Post #14 |
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yeah thats why I used the AW grease, its alot like that - you squeeze the tube with all your might and you still have to wait for anything to happen, it did take a while to fill up the diff... I knew it would be good cuz I used it in the diffs for my stadium raider, which for an overgeared touring car based truck with open diffs is still a pretty good climber...
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| WhiteWolf McBride | Apr 16 2006, 06:00 PM Post #15 |
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Making Trax!
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Guys... You never thought of dropping the tube into boiling water to soften it up before ya try to get it out of the tube? As someone who's wrestled with a near-solid standard gearbox on a -20+ C day, I know what a bit of warmth can do. I usually started the car up, and let her idle for 5 before trying to roll her. Starting her was easier than moving the tranny due to 5W30 in the engine (an Escort LX 5 speed 1.9 litre) One of ya willing to be the test of using 120 thou or the 300 thou in a TXT diff before I do, or am I gonna be the guinea-pig on this one? If it'll stay inside a EV diff, it should stay with minimal sealing in a TLT one. |
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WhiteWolf McBride CEO, TaskForce Technologies Inc. Ottawa, Canada | |
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| outcastrc | Apr 16 2006, 06:32 PM Post #16 |
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No reason why it shouldn't stay in there. As long as its thick enough there should be minimal losses. One of my next projects I may try 300k in a tlt diff just to see what happens. Time will tell... |
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| sloppy | Nov 5 2006, 07:23 PM Post #17 |
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isnt the blizzard diff the same one from the 1/8 scale buggy and twin force? |
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| outcastrc | Nov 5 2006, 07:29 PM Post #18 |
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No its much smaller, Its out of their onroad cars I believe. My Twin Force diffs are about twice the size. |
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| bmwnla | Dec 19 2006, 06:35 AM Post #19 |
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Worthy of the Trax!
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i have a quick question....when you put diff lock in your diff.....how much do you put in? Just fill it up or what is the right amount?
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| outcastrc | Dec 19 2006, 07:44 AM Post #20 |
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Fill it to the top of the cross pin, but no more... If its too full then the diff won't be able to rotate. |
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| zenmasterzoso | Dec 16 2007, 07:06 PM Post #21 |
Worthy of the Trax!
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Well , I know this post is old ,,  I put 100,000 wt oil in the diff and it did help with steering.It seems to of lost some power with the stock can motor but improved the steering,trade off.So now I have installed a Core stock 27 turn motor and it has help bring the speed back.Next gonna try a lighter diff oil and see how that works.
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| outcastrc | Dec 16 2007, 11:17 PM Post #22 |
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I am not sure where the line is on how light an oil you can go with. The diffs not especially made to be sealed tho it does a decent job at it. My 120k diff feels as good this year as it did last year so I can safely assume that the oils still in there... It would be worth knowing where that line is, wether it be 30k / 50k or whatever... |
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| newracer | Jan 16 2008, 10:21 AM Post #23 |
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Swayed by the Trax
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I have some very thick OFNA "diff lock" stuff, I am thinking it might be too thick. I might try the Tamiya Anti-wear grease I have. The OFNA stuff I have ran out of my TXT diffs. Maybe since you are not filling the diff all the way up it doesn't leak. |
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| nomobux | Jan 17 2008, 05:16 AM Post #24 |
Swayed by the Trax
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I'm gonna go with some 100K I have when the bearings and pads get here
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| nomobux | Jan 17 2008, 05:17 AM Post #25 |
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Swayed by the Trax
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I'm gonna go with some 100K I have when the bearings and pads get here. Oops double hit |
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