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Post by sp0ngebob on Jul 14, 2015 14:21:11 GMT -5
First of all my justy is not RWD not 4WD. I did rebuild real diff changing it into lsd-limited slip differential. Works as usual diff while crusing, and locks at WOT. Locks means both axles rotates with the same speed. As in Sport cars. That makus justy a drift machine, when pedal is pushed till the end. In the US we call those auto-lockers. They're different than an LSD. this is not an "auto locker" its a 1 way differential. if "locked" under accel of any kind and open when under decel and not actively locked by some kind of input other than throttle its not a locker.
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Post by kcswimrac on Jul 14, 2015 19:03:45 GMT -5
Alright lets not butt heads over what to call this awesome diff build, there's so few of us in this community, lets just go back to admiring the thing of beauty.
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Post by bizarro on Jul 14, 2015 19:32:35 GMT -5
Yes, over a beer! Please!
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Post by bizarro on Jul 14, 2015 19:33:07 GMT -5
I'll buy drinks next week if any of yall are I'm Eugene hahahaha damn
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Post by kcswimrac on Jul 14, 2015 19:37:18 GMT -5
I'm only 170+ miles south of you! lol
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Post by bizarro on Jul 14, 2015 19:41:12 GMT -5
Aw shit...haha
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Post by kcswimrac on Jul 14, 2015 20:26:36 GMT -5
Hey, does anyone happen to have the dimensions of the diff carrier? And i'm assuming the front and rear aren't the same? I've got a future project idea brewing. lol
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Post by bizarro on Jul 14, 2015 20:28:48 GMT -5
I need to get out of this apartment and back into a house...all this tinker-talk.....driving me nuts!!
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Post by sp0ngebob on Jul 14, 2015 21:00:42 GMT -5
bizaro youll never believe it but im going to be in eugene this weekend. i got your PM. ill text you a piktar tonight of the battery cable attachment points.
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Post by bizarro on Jul 14, 2015 21:02:44 GMT -5
Sweet!! Where you live? Hell yeah!
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Post by bizarro on Jul 14, 2015 21:03:31 GMT -5
Thanks man!
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Post by jasin on Jul 15, 2015 0:51:01 GMT -5
not trying to knock it. I think this is mega cool that you had the balls to go do this. However i still dont see the need for the "friction disc" but that may be a misnomer, or the wrong word. the spider gears dont spin on the axle stub shafts. they are driven 1:1 with the axles. so maybe that was to improve or reduce clearance between the housing gears and the spider gears? a pretty easy solution if you had a little play in there that needed to come out. wicked cool build. your drawing is exactly a phantom grip btw. watch te video again www.youtube.com/watch?v=WeLm7wHvdxQ&feature=youtu.bein usual LSD (cluch type/plate type) there are cluch packs made of friction discs and friction plates. Friction discs are connected with side gears (in fact axles) and friction plates (steel plates) are connected with diff case (in fact shaft). There is a separation force between spider gears and side gears. This separation force is higher the higher shaft torque is (in fact engine torque of course changed by the trasmission). The higher the separation force is the more cluch pack is locked (thightened). Imagine the situation that clutch packs at both sides are compleatly cluched (locked) - in this situation both axles rotate the same speed. Now imagine situatuion that cluch packs are compleatly open - that is the situation in normal (open) OEM diff - in that case actually the torque is trasmitted only to the axle (wheel) which has a lower resistance (not sure if it a suitable word). So in LSD the level that cluches are locked depends on the torque which comes from the engine. In my diff there are no cluch packs, because there is a lack of space in the diff. Instead i used one friction disc each side sticked to the side gear and insted of friction plates (steel plates) in my solution there is just a diff case. Works exactly the same. That is a little simpliefied type of LSD, because it has no so called 'ramps', but some of OEM LSD (ie. Mazda RX8) are builded in the same way (in Mazdas diff friction plates have much higher diameter). If anyone wants to have some of dimensions, I have a second diff partly in portions, so I can measure something (in mm ) , but that is possible during the weekend.
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Post by kcswimrac on Aug 2, 2016 11:14:54 GMT -5
So let me see if I can sum up what I understand from this. So you milled/turned about 1mm off the back of both the spider gears, then had clutch material added to both backs of the spider gears . The center has two plates, that looks square from the pictures, and a very stiff spring in the middle.
So from my understanding, the spring provides the preload to the spiders, and when under WOT or High load on one wheel vs the other, the tooth profile of the bevel gears causes the spider gears to be forced outward against the differential housing. And the clutch material just helps the gears grab the housing and when in this state the axles will both be trying to rotate at the same speed as the differential housing.
It's a clever little set up! How does it handle while in turns with throttle off-on-off mid turn? Just curious if it has any unpredictable character that might make it hard to handle in situations like snow or wet turns.
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Post by dez on Aug 2, 2016 13:48:06 GMT -5
Wow
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Post by jasin on Aug 3, 2016 0:46:36 GMT -5
So let me see if I can sum up what I understand from this. So you milled/turned about 1mm off the back of both the spider gears, then had clutch material added to both backs of the spider gears . The center has two plates, that looks square from the pictures, and a very stiff spring in the middle. So from my understanding, the spring provides the preload to the spiders, and when under WOT or High load on one wheel vs the other, the tooth profile of the bevel gears causes the spider gears to be forced outward against the differential housing. And the clutch material just helps the gears grab the housing and when in this state the axles will both be trying to rotate at the same speed as the differential housing. It's a clever little set up! How does it handle while in turns with throttle off-on-off mid turn? Just curious if it has any unpredictable character that might make it hard to handle in situations like snow or wet turns. Exactly! your description is better then mine It's predictable - on the wet surface in turns when you push the pedal you can feel it locks and you can easyli control slide, when you release the pedal it unlocks and slide ends of course Justy is quite short and it is not very easy to control it in long slides comparing to longer RWD cars. btw. when i rode it it was still ECVT, now i've changed to 5-speed, but still did not try it due to neverending turbo project
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Post by kcswimrac on Aug 3, 2016 13:15:50 GMT -5
Awesome, I may have to do this to my rear diff. Yea I know the feeling if the never ending turbo project. haha
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Post by southerner on Aug 4, 2016 17:04:57 GMT -5
jasin, sorry for the offtopic, what size are your rims/tires ? i intend to go 15" with 185/45 tires wich should look kind of what i see in your avatar picture..
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Post by jasin on Aug 5, 2016 0:26:17 GMT -5
quite narrow - 165/50 R15
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Post by kcswimrac on Oct 14, 2016 13:10:56 GMT -5
Just curious to here how this is holding up? Thinking i'll be trying this soon.
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Post by jasin on Oct 14, 2016 14:45:02 GMT -5
I had a break in driving due to turbo instalation but it is already almost done. Hopefully I'll be able to ride in to weeks
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