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ok we have to go over this again. posi/limited slip and locked diff are different!!!.
a normal diff like the one namuna showed is found in most cars. when a car makes a turn, the outer wheel naturaly want to spin faster and the diff also refered to as an open diff will let the car take a nice smooth turn.
limted slip diff does just what they say, they fight against the wheels so they will turn at the same speed. but it can also be over powered and still act like a normal diff.
the problem with an open when u start adding more power a lsd becomes nessesary. what will happen is that while going through a corner as wait shifts out the inside wheel has less traction and will start to spin faster which will send the car into an oversteer. a lsd will help keep both wheels spining at the same time, but can diminish smoothness and overall handling. it is also needed with high power drag cars when they take off from a start. it helps keep the cars going straight even if one wheel hits a slick spot on the road that could send an open diff car into a donut.
a locked diff or welded diff has no real use but for straigts or rock crawling. in order for a car to turn properaly the outside wheel must turn faster, and if the the locked diff doesn't let this happen then u will have horrible handling. if the rear wheels have more traction then the front then u will get major understeer. if the front tires have more grip then the rear tires will slip and send u into a donut. a locked diff is just a bad idea.
i'm not to sure why the xmod will just suddenly have the wheels slip out from under it while going straight. probaly one finds more traction and pulls to the opposite direction or unequal wight distrubution. and like i said before, u will do a donut with a locked diff.
i wish there was a way to make a lsd for the evo but know ones can figure it out yet. i've had an idea of filling with a thick vicous (liquid) material that make it hard for the diff to one wheel faster but it can be overpowered like a clutch pack lsd. the problem with this is that the diff will likely leak and some oils and other liquids can break down the plastic.
the easiest lsd i can think of is a ball diff. get one then put somethin in there, or tighten it up good.
the lessen u learned here is that a limited slip diff is a cross between an open diff and a locked diff and it will preform as both. never lock ur diff either, nothing good can come of it. also posi stands for "positive lock", meaning the diff locks up under acceleration but turns back to a normal diff wheel deaccelerating. great for drags.
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