How the OS Giken Differential Works and How to Tune it!

In this video we have a torn down OS Giken limited slip differential we'll be installing into a customer car, but before we do Mike is going to show you all its components, what they do and how they all work together. We'll also show you how the differential can be tuned to suit your driving!
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[@MitchChubey]

Every time mike talks I learn something.

[@tracymorgan571]

even when mike doesnt talk, things are learned

[@thevtecnician]

😂😂 yes!

[@DIGPLatinodriftking1]

Honestly I don't understand how more technical channels like this lack in subscribers. Everyones caught up in big wheels and big horsepower and overfenders and stance, but its channels like MotoIQ that explain the technical details and how to of the overall systems of a vehicle.

[@motoiq]

Help us spread the word!

[@maxre9626]

Because a lot of people lack the time or desire to go this in depth about learning things. I'm here 3 years after this video is posted due to searching specifics on the OG Giken Unit. Thank you for the video.

[@Just_Wanna_Drive]

Man, you guy's are the answer for the forums sucking so bad these days 😅 Thanks for the in depth information!

[@robertbrathwaite8173]

This man love his work.. always has a smile on his face.

[@anydaynow01]

Hands down one of the best casual explanations for how a clutch type differential works!

[@charlesclarke9430]

Hopefully the "Wave-Trac" differential will get this same thorough explanation next! PLEASE PLEASE PLEASE!!!

[@Supndrup]

Agreed, that would be really interesting to see

[@motoiq]

I happen to not like how they work, don't lock hard enough.

[@dazaspc]

Don't mess around just get a Torsion style.

[@motoiq]

@@dazaspc those don't work so great either

[@midnighteightsix6919]

Just installed an OS Giken 1.5 way LSD into my Toyota 86 about a month ago. Could not be happier with it! Completely transforms the way the car drives for the better; so much more stability and traction when applying the throttle. Basically turns the car into a 'point-and-shoot' affair at corner exit. The car is also more controllable when oversteering and gives greater ability to throttle-steer the car, to adjust your yaw angle and racing line. Mind you this is in comparison to the OEM Torsen, from a racing perspective the OSG is in a whole other league.

[@paulshi5974]

Congrats to you! What stiffness of cone spring and pressure spring did you choose? Or is there a preset for the 86 from OS Giken you can grab off the shelf? Thanks!

[@jsr3793]

Excellent. Now please make a video series of your ultimate guide to suspension stories.

[@paulshi5974]

Sorry for the late comment. Thanks for this insightful video, and I have a few questions. 1. On WPC treating the clutches, since WPC reduces friction a lot, will it make the LSD less capable of (or even incapable of) achieving near 100% lock? And will it require you to change to a more aggressive spring setup to retain the locking capability? Also, will it reduce the rate of lockup across all possible spring setups? I am new to WPC, and sorry if this might sound like a silly question. 2. If you still recommend WPC treatment, would you also treat the cone springs along with the clutches? 3. Do you recommend OS Giken's oil or some other brands for the diff? 4. What spring setup would you recommend for the new GR86? Thank you very much!

[@motoiq]

Yes it still locks just as hard, just more smoothly. The cone springs are not necessary although we would do the pressure rings and the case. OSG oil or Redline is what we use and we also add some of redlines LSD additive. The settings really depend on the size and type of tires, suspension, aero and type of use.

[@paulshi5974]

@@motoiq Thank you so much! Oh for settings, I'm thinking of changing to a set of 235/40 R18 Advan AD09s (hopefully they come to the States soon), stock suspension for now (probably changing to something like HKS Hipermax S or Blitz ZZR in the future), no aero or power mods.

[@Fze5656]

Was waiting for the giken pronunciation correction LOL.

[@frostykyogre]

Yeah, people always have trouble pronouncing Japanese stuff in the car space but Japanese is fairly strict about pronunciation so if you want to know for certain (or to settle an argument) it should be possible to look up. Unlike English all consonants are paired up with vowels (except 'n' can be on it's own) and there are only 5 vowel sounds whereas English represents 13-15 vowel sounds with combinations of A,E,I,O,U, and sometimes Y and W. I think one example that tends to get said wrong is Mugen, usually pronounced Myu-jen it should be moo-gen (hard g). You can see why it happens, 'mu' in English is usually pronounced like mug or mutate with a magic 'e' but in Japanese 'mu' is consistently pronounced 'moo'.

[@filip000]

I completed the installation of OS Giken superlock LSD in my 370z this weekend and it just transformed the car. Where the old VLSD hesitated and you never knew for certain if it would grab or not, sometimes forcing the car in a weird understeer with bodyroll, the OS LSD predictively behaves and you know just how much you can put the power down and when you'll initiate a powerslide. It's just so good.

[@Iseenoobpeoples]

By far the best mod I've done to my Toyota 86, I went with the Cusco Type RS.

[@stevepeters3032]

I wish Mike was my Dad lol. All the knowledge 🙌

[@akioasakura3624]

GOAT

[@jasonp978]

I have an OS being installed in my 996 now. Thanks for the video, really good info.

[@spooler7828]

I am enjoying mine in my 370z. I think I need to change it up some because I went from stock power to 900whp. Thinking on what to do.

[@xpert_kid_one730]

What about going welded

[@gerardvanreenen9747]

Great video! I love it, keep doing these video's, I learn a lot. Thanks!

[@davids4830]

I like that in the middle of all the technicality Mike said, "One tire fire".

[@samuelhicks8277]

cool what do you think about factory Toyota LSD like '87 supra - '09 tacoma vs a detroit or something, I like the factory diff. Thanks

[@Tguedes98]

congrats man!!! You mike, have an amazing vibe! just discovered your channel and I'm loving your videos!!!!

[@neetones]

His permanent smile is really amazing.

[@tougedriver8358]

Awesome video, wish this video came out before the time my friend and I were arguing. My friend was saying his OEM torsen diff is better than a clutch type LSD.

[@gracielkelly9645]

Could you do a follow up video on gear based LSDs like quaofe and wavetrac versus these clutch based ones. Please.

[@RubberChickenMan007]

I love this stuff

[@zyrellguzman1355]

Mike is Legend.

[@poyaispanic5269]

I have these in 2 of my race cars, and these things are bulletproof

[@ncrx1]

@motoiq if i'm going through the effort of sending the clutch plates for WPC, would the side gears and pressure ring benefit?

[@motoiq]

Yes

[@ncrx1]

@@motoiq where would i find the torque specs to reassemble the lsd with if i send it out to wpc?

[@motoiq]

Call OS

[@84gssteve]

Funny thing is, the factory LSD on a stock, 40 year old, 100HP 1st gen RX-7 is basically the same unit. Yea, its not lightweight or 2 way lock-up adjustable but you can mix, match and stack the plates to change the breakaway force.

[@motoiq]

Many old factory LSD's were like this, your Mazda part didn't have the variable lock-up that the cams provide and the only way to control lock was the clutch shim preload. The OS diff is a Salisbury type if you wanted to look it up.

[@672640]

I've never learned something while feeling so happy watching Mike explain things.

[@MrVuosi]

Bless him! After the first video no more mention of Giken 😂😂

[@n.p.a1466]

Can i put this into a 99 GC8 WRX sedan?

[@motoiq]

I believe they make one, google is your friend.

[@pmassey2]

Is that a smile of to combat being uncomfortable?

[@nela5596]

Great video man!!! Any shop you can suggest to ship my diffs to have the OS LSD installed and tune to my set up? Thanks!!

[@motoiq]

We can do it, go to motoiq.com and fill out the garage services link.

[@latuba2478]

But is the Apex Silver Evo 9 for sale?

[@kellysandford1877]

Gotta get Mike in the thumbnail. I almost missed this.

[@blamkin86]

Great video and explanation. How does one procure all the different belleville washers and lock springs? Are they the same for most/all applications or are they vehicle specific? I'd like to try a different setup with mine and this is inspirational.

[@motoiq]

You get the from OS Giken directly.

[@Raysboostin]

Great video. Definitely need to get my plates treated as described to reduce chatter.

[@Jeffball610]

I wish I could afford the OS unit and WPC treatment. My Tomei 1.5 is a bit harsh for my little car. The combination of light weight, small tire, and short wheel base makes for a rough ride when it's not fully warmed up. Tomei never got back to me about how to lessen the initial lock up and they don't mention how to do it anywhere, but I followed a KAAZ video about swapping a clutch around. I'd like to try WPC, but I'm not baller enough for that. My slop will just have to deal with it for now #4G63510

[@motoiq]

You can try to deactivate some of the clutch packs by flipping them, try two per side. Also, try a bottle of redline LSD additive in the oil.

[@Jeffball610]

@@motoiq I flipped one clutch and plate on each side already. I'm currently running Redline fluid with no additive, and I'm about to run Tomei fluid back to see if it helps. If not, I'll try the additive. Again, I think my issue is light weight car (2275lbs) short wheel base (95") and an R200 diff made for much more powerful and serious cars. But anything can help. Once the fluid is nice and hot, it performs great in tight turns.

[@AllTheBestNames]

Insane that this channel only has 20k subscribers.

[@motoiq]

Help us get the word out! Sometimes we get dismayed that channels without much substance are much more popular!

[@1337Hans]

Any point to WPC on the os giken gears amps\cams?

[@motoiq]

Not as much as the clutches.

[@sirtnfol8476]

WPC treat everything

[@TheGinger1]

Really enjoyed that. More like this please

[@mrkazman]

this guy is so relaxing

[@ShelbyPaget]

Thanks!

[@TheSkattin]

Great video!

[@turbogears900]

What oil can I use with this os giken ?? For break in

[@motoiq]

Something like a 90/140 with some LSD additive to reduce chattering.

[@turbogears900]

@@motoiq thanks

[@TerryFT86]

Yesss new content!

[@leomatthews6432]

How about explaining a Torsen style LSD?

[@motoiq]

hahaha, we don't like the way they work so we don't install them very much! Basically, the side gears turn on worm gears that cause them to move sideways and dig into the diff case when the wheels turn in opposite directions.

[@leomatthews6432]

@@motoiq Thanks for the response. I enjoy the technical videos. I've seen that type of wear on cheap(OBX Chinese knock off) Torsen style diffs. I haven't seen that on Quaiffe manufactured differentials. Which manufacturer did you have that issue with? What was the application?

[@motoiq]

@@leomatthews6432 it's not an issue but how they provide limited-slip action by pushing the worm gears into the case.

[@robertrishel3685]

Who is he looking at off camera? He looks like it’s all he can do to hold back laughing like crazy😂😂😂😂😂. Like there is a goofball standing off camera making funny gestures to him so he will start laughing?

[@robertbrathwaite8173]

The Bruce Lee of.. High performance!

[@Reventon777]

For a 911 you should be running a reverse 1.5 way with more locking action on deceleration

[@motoiq]

We have no idea what you are talking about, there is no such thing as a reverse 1.5 way, a 1.5 way or 2 way yes. As far as type it depends on the end use. If you had more lock on decell it would make a 911 have even worse trailing throttle oversteer which is already a problem with the design.

[@Reventon777]

@@motoiq Porsche has almost always had a more agressive lock up on decel, 930s had 40/80, 964 RS had 20/100, 993 had 25/60. Should be able to dial out the understeer with sway bars and alignment. I've always just called it a reverse 1.5 as most people think of a 1.5 being less lockup on decel.