hello a everybody welcome to new episode of how to DIY Rc Wltoys
k989 1/28 scale RC drift project we're in today's episode we are going to install
the one-way diff and show you the modification that I did to make it
perfect because if you do it perfect you are really having a winner and getting
real proper drift car so let's dig in and install time full installing of the
one-way diff I'm really hyped about this one-way differential all the time I knew what it
can do and now I'm gonna show you how it works let me just get it a little bit
into focus this is completely metal diff with special one the bearings
on the inside has been free long way and friction the other way around so I can
turn wrong way but I have friction the other way
this diff size is a little bit too short we need to extend this axis outside a
little bit to get the correct distance but there's one issue to get it far
enough out of the axle so that the dog bone really deep inside this cup
should be sitting then axle is sticking out too far out of the Differential and now it's
spinning three two ways so then the Rc diff doesn't work anymore
turning your 4WD drive into a rear-wheel drive drift car something you
really don't like without a gyro because then he got super much oversteer you
only want a little bit oversteer and this make this a difficult upgrade
and need some modification to the cup to get it correct you can choose you can do
to two things you can extend this cup like the walls and make them longer just
like the stock axles stock cups or you can do what I did and just filling up
the cup with paper just normal copyright paper but it needs to be perfect
not one half mil too much another half mil to less because if there's is not
enough paper inside then it gives too much play making it move in and out and
everything moves and all too far it doesn't work anymore so then you have a
death that sometimes works something doesn't you need to put in enough paper
on the side of the cup to make sure the dog bone sits really tight in there but
not too tight because then the wheel starts to stop spinning free just around
off and it's like having a brake on it all the time so when you release that
throttle at that moment and depending on which wheel has the problem the car
steers that way because there's like a brake on it all the time
something you don't want that's the first modification the second
modification that we have to do I will be showing while we are installing it
but the second item you need for this upgrade / mod are this m3
washers there's 3mm hole on the inside and outside
diameter is seven mil you need to be really careful that because they also
m3 washers where the inside is 3 millimeters and outside is
9 millimeters but these are three millimeters inside diameter seven mil on
the outside keep that in mind and of course you'd be
finding links also down below just to make it easy for you and you need to use
two washers on each side of the axle so each axle gets two of these washers
little tiny fiddly job
keep those to the side for now then this is the way we have to install the diff into
it but you get four spaces and going to need all four spaces but there's a
special way of how to put them into place and actually should show it all
the way around but this is the easiest this is how the diff is going to be
inside with a long piece on actually it is the right side of the car but for you
now it's on the left and on the left side you're gonna put three washes this
is all together perfectly aligned with the pinion gear we're also gonna be
destroying the pinky because this is metal so if it doesn't line it up
perfectly and it's too much pushing inside the pinion gear or it's gonna be
destroyed in seconds but luckily this Rc differential last a long time until the
bearings gonna go give out and so dark and small side but there are special
bearings on each side of the diff so don't get confused we put three washers on
that side then you put the bearing from the stock diff back in this place this
and then we put one
washer on the right side and then at the bearing this makes its it's super tight
inside the case and you can also now just assemble the case and then we're
gonna push it in the axis later on just do step by step now we're going to add
one way diff axle is a figly job I'm just gonna show it can be done
they need to get the dog bone sitting in there really hard to show come up on camera
and the same time you need to get arm into place and you need to get a long
screw inside the arm while the dog bone sits in it's place it's also figley but that is when you
have done the easy upgrades you're only gonna get more difficult or more
difficult and more difficult I hope to show you that it works you can see you
know there's not enough plague I'm not going to do that difficult figgly job is
gonna take some time I'm gonna be right back after installing the diff it's time
if we did the modification correct and if you have add enough paper to remove
the play so the dog bone don't fall out and it reaches the cup and it sits in
that tight but at the same time not too tight to make the wheel run rough still
needs to spinn free even just a half mil too much paper in that cup and you will
is running a rough and if that creates a little bit of friction and just a little
bit of friction driving on ice makes the car turns left all the time because it's
just like this wheel a little bit on the brake so that's why I didn't recommend
this upgrade for the beginner but I've shown you how to do it and if you get
the right your car turning into a real proper difficulty can with it because I
really liking it and that's why you'll be finding the link
down below and I hope you'll like it too and give the thumbs up and if you didn't
then give the thumbs down and I hope to subscribe from the next episode
we are really going to upgrade the steering servo and I want to say thank
you all for watching and goodbye until next time