$1500 for a LSD?!?! Why the OS Giken Super Lock Limited Slip Differential is worth it!

We recently installed an OS Giken Super Lock limited slip differential on our Project DC2 Integra! Watch as Mike Kojima explains everything you ever wanted to know about LSD but were afraid to ask! The OS Giken Super Lock 1-way differential completely transformed our Integra and even at a price point around $1500 it's one of the biggest bang for the buck performance modifications you can do on a front wheel drive car--especially if you take it to the track!
Quick note from Jonathan Lugod @ OS Giken: Their diffs are not static preload adjustable. With the number of clutch plates available, higher preload isn't necessary for high horsepower builds. For lower horsepower FWD builds (under 250hp/25t/lb tq and 200 treadwear tires), quicker lock timing greatly benefits the set up. All OS Giken LSD tuning is done in house as they have a vast database of information to jump start a high end build with minimal back and forth (if even at all!) Services start at $150 shipping included. Email [e-mail] for any questions!
LINKS:
Read the full article on MotoIQ: bit.ly/2ETSD9W
OS Giken Super Lock Limited Slip Differential: osgiken.net/c-1280300-limited-...
READ MORE about MotoIQ Project DC2 Integra: www.motoiq.com/Projects/Acura/...
VISIT our website: www.MotoIQ.com
FOLLOW US on Instagram: / motoiq
LIKE US on Facebook: / motoiq

[@d4a]

Great video! Really well explained. Loved the running gee-ken gag.

[@Limeayy]

Ha! It's D4A. I love his explanation on how a differential works and shows the cam too in 6:51 camera shot.

[@d4a]

Lime Yoo! We're watching the same vids it seems :)

[@mugshotmarley]

Great job Mike. Was waiting for a show like this where Mike can get detailed. Dude is like the import Yoda.

[@mattkrazit6414]

Quality stuff here. Great explanation of mechanics w/ real-world application. Keep doing good things like this!

[@brian6speed]

I'm geekin on some Giken.

[@brandonlee1547]

stop that. xD lol

[@marchanson711]

These videos are terrific. You will have a million subscribers shortly. Excellent work! Love the in-depth technical details.

[@666AL]

Mike’s a legend. Makes me want to rewatch all the behind the smoke episodes with dai.

[@turbotrana]

Good video, about time someone did an explanation of this style of LSD

[@TheJELLIBN]

Very, very good description of how a Giken works and of the benefits and adjustability. Great voice btw.

[@aasastephenson1538]

Thanks for all the info! This guys a legend!

[@zeppelin926]

Its 1am amd 10:01 scared the shit outta me

[@sigmaoctantis_nz]

same here lol

[@rattaponlertpiriyapong1187]

Does it click alot

[@steveodorito]

Really glad to have indepth automotive content where entertainment is put behind education.

[@motoiq]

It's really nice to hear that, seriously! Share with all your car-nerd friends! :)

[@pauljordan756]

Excellent detailed explanation! I am installing an OS Giken into my 370Z this weekend. Thank you for sharing all this great information!!!!

[@motoiq]

awesome!

[@Steve-zo4uc]

Paul Jordan how did the install go ?

[@spunkysandoval]

Love the howard cameo at the end.

[@lucasboldino2261]

Mike Kojima is the legend!!!

[@allenkilpatrick7701]

What an awesome video. All around

[@drtone]

you can also play with higher/different viscosity gear oil to tune this to be more aggressive, especially in RWD dorifto applications, as the OS Giken out of the box is tuned for softer engagement(and thus less chattery and more dual purpose friendly, as designed)....so i've heard

[@Limeayy]

6:51 is what the cam i'm talking about ^ :D When the trans is in forward gear the Pinion Cross shaft would would back, think of it as the Pinion Cross shaft being you in the drivers seat and you romping on the accelerator pedal and whats going to happen is you'll be pushed back into your seat, same explanation with the differential cam and Pinion Cross shaft, it moves back and pushes out the wedge shape triangle cam and the pressure rings would then compress the clutch packs so it won't differentiate the wheel speed from left to right. I hope i got that right, this is my explanation :D While braking if its a 1 way LSD the opposite side of the cam is going to be flat material where the pinion shaft cannot place any wedging effect on the clutch packs. I already knew this info from looking online but could never find a good video about it till now. Thanks Mike.

[@Ap2_dc2_007]

An update will be awesome!!!!!!

[@thopu7427]

I only know Mike Kojima from listening to the Slip Angle podcast. Nice surprise to see he's got a perpetual smile on his face or he's got a OS Giken Diff fetish. Great video. Doing research for an NA Miata.

[@Ap2_dc2_007]

Can we please get more video with the new LSD, OS Giken. Love to see on how it handle on corners of back roads. 😍😍😍😍

[@forbiddenera]

This dude is SoOooo excited / happy for the diff.. that alone makes me want one.. you should directly compare giken with a quaiff or mfactory other types .. figured this video would've focused on that more.. I always pronounced it giken too

[@motoiq]

It's my favorite diff, most tuneable and works the best.

[@justintowers8230]

cool stuff. appreciate the info behind the engineering. this is $1600 for the ST202 Celica. integra only direct competition for the late 90's

[@lexzenis2544]

guy actually scared me at 10.00 sec coming through the door like a horror movie!!

[@heavymetalmadman3533]

awesome vid.

[@DanielRodriguez-kl1ls]

10:01 scared me. Awesome technology. Thanks for the vid.

[@motoiq]

oops! Ian is really nice...we swear!

[@NoferTrunions]

ME TOO! For real-zees!

[@brandonlittle6444]

I'm feelin congested watching this video

[@beachboardfan9544]

With how smiley this guy is, you know a bunch of friends were behind the camera making faces at him or something

[@mikekojima9761]

they are

[@joelolivas4686]

That's how he looks. I thought the same thing at first.

[@tommyvercetti6035]

I think he's just stoned

[@Beanpapac15]

not sure why the whole geeken thing was so funny, but it made me laugh every time

[@driven365]

I did not know that, thank you.

[@JS_550]

Nice to see Howard! T^2

[@doriangray2347]

He is freakin brilliant

[@raw_pc]

TheHoly Grail of all car parts :)

[@sergiquin1471]

Good stuff 👍, now I know how to pronounce OS-giken

[@whatthe363]

Hahaha so I hop on google to look into this LSD. Clicked the first video. I didnt even read the channel name... The second I saw Mike I had a big smile on my face XD

[@incognito8219]

mui excellente video

[@hfracing]

im using the OS giken in a high power miata, it really is the best ive tried so far.

[@Skouloudis_g]

hfracing I want to buy an Os giken for my turbo efr6258 miata 300+hp. What set I have to do to the diff? Number of discs? Thanks

[@ziahreid9269]

This guy looks really happy about getting that lsd.

[@mikekojima9761]

because its bad ass!

[@customconnections2425]

9:03 Guys, Im dying here!!😂😂😂😂😂

[@wolfpac550]

I have a Wavetrac LSD and I love it. I plan to build a extra transmission and I will try the OS Giken, can't wait to see how it handles. I have a Kaaz lsd that's been laying around my garage for 5 years lol, I rather spend the money on a new OS Giken than rebuild the Kaaz.

[@iceesrule75]

How is that wavetrac?

[@wolfpac550]

@@iceesrule75 it’s great with no issues and it really shines in cornering. The grip is amazing

[@iceesrule75]

@@wolfpac550 Might get one from speed factory and also what kind of suspension you using?

[@wolfpac550]

@@iceesrule75 KW v3

[@CarHound]

I would wanna see more about that Integra only saw this video. Playlist please

[@motoiq]

we've got the baseline track test video: kzbin.info/www/bejne/aIXQpHqMfbF3gas and a link to all the articles on MotoIQ.com in the description!

[@Fitness195]

He is perfect for the camera. SMILE SMILE SMILE. lol. Looks like a happy dude lol

[@NoferTrunions]

Hummm... I have a worn out Trac Lok in my Gen2 Viper. Thinking of upgrade. Perhaps easiest way to say it: "Anything that makes the car easier to control!" Anything to tame its viscous snap? - perhaps better control leading up to the snap event...

[@NoferTrunions]

The ultimate refinement of the "ramp style" LSD perhaps?

[@user-ri5gq7ey7p]

Surprised to see all this love for OS Giken when KAAZ is just as customizable, right down the street from you guys and they use WPC treatment on the clutches in their QT model differentials to allow them to require barely any break in, longer clutch life and cooler operating temperatures. Same designs and customizability and great state side support too. Not that the OS gikens arent awesome just that KAAZ has been well supported in the US for a lot of years now and make some super nice pieces.

[@motoiq]

OS is way more adjustable than KAAZ. KAAZ is a good quality but very conventional salsbery type LSD like any on the market, it has more clutches and tends to lock up very aggressively. It is only adjustable for initial lock up through 3 different cone spring thicknesses and by deactivating clutches.

[@pauldownsyuen8493]

Awesome video - Did you have to worry about shimming the diff to fit? Or are B & K series transmissions have tight enough tolerances?

[@motoiq]

No, you have to shim it unless you get lucky.

[@drizzetsrevenge]

GEEKIN

[@michaelmckay]

One tire fire!

[@motoiq]

Haha! Not anymore ;)

[@driven365]

“That’s lame.”

[@peopleschampgarage7869]

I need a LSD for my K24, I'm sold on this one if it can handle drag racing also. Looking at 350whp and 24.5 slicks, and also hpde's too.

[@motoiq]

It will handle that no problem.

[@joeynachanphasuk7002]

MotoIQ so with this 1.5 can i do 9k launches in my ap1 F20c with 255 square set up lol

[@jasonsnyder1654]

Would using heavy springs reduce diff noise and chatter in parking lot situations? Maybe deactivate a set of clutches, use the heavier cone spring and the heavier opposing springs and have a nice daily that won’t one wheel peel?

[@motoiq]

WPC treatment of the clutches and the diff housing makes a huge difference in chatter. Stiffer springs reduces the initial breakaway torque but doesn't do much for noise. Adding redline LSD additive helps as well.

[@aaronwilliams6165]

I have a much better understanding of how the LSD works looking at the parts instead of a 3D animation

[@ayowser01]

What are your thoughts on a carbon ATS 1.5way for an s2k?

[@neilmchardy9061]

Cone spring? It’s a Bellville washer.

[@imdlaw23]

Giken means "technical institute." Took me forever to understand what the last guy was saying.

[@SpoonerTuner]

Thanks, ya I was trying to figure it out too.

[@Ztaal3]

damn I want one so bad... How ever I am surprised that there was no wpc treatment or other magic stuff :P

[@mikekojima9761]

this diff is really smooth so it doesnt need it.

[@Ztaal3]

Ah, that's great to know!

[@aaronwilliams6165]

How do I find a guy like this to work on my transmission?

[@sr20ser.]

Cone spring? Belleville spring washer/disc spring. Gotta be a smartass when I can.

[@motoiq]

The manufactures terminology for the part is a cone spring.

[@TheWolvesCurse]

1500$ for a diff is quite reasonable. at least here in germany you pay about 800-1200€ for a used rebuilt lsd for older bmw, like e36, e30 or e46

[@mrsquishyboots]

I was about to say the same thing. I needed an lsd for a e28. It was cheaper to go with a 540 rear assembly and its diff than find a period correct lol. Custom mounts and my wheels stick out lol.

[@cnknguyen]

hi mike

[@malexander9146]

Love the pronunciation correction

[@Limeayy]

One thing Mike Kojima got wrong is that is not a transmission, that's a transaxle. They are not the same. I do love MotoIQ, literally shows you shots and glimpses on taking apart a differential gear from the transaxle. This is what makes my life worth living. ^^

[@SR-fx5sm]

10:00 that scared me lol

[@paulshi5974]

I am sooo tempted to get an OS Giken LSD for my GR86... BTW Mike, have you heard about their newer Dual Core LSD? It features a helical cut side gear design instead of Super Lock's straight cut design, and OS Giken said it combines torque-sensing and speed-sensing in one package. What's your take on it? One more thing: at 1:30, there is a "US spec" printed on the case. What's different about US spec? Thank you.

[@motoiq]

I want to try that differential badly but there are not too many applications. I don't know what US spec it.

[@paulshi5974]

@@motoiq I live in a place where winter is snowy and slushy, and snow doesn't get plowed. Do you think Dual Core can have an edge?

[@motoiq]

It's more for road racing applications.

[@TachOnRed]

Ummm... actually even "gee-ken" is wrong. It's gi-ken. A short "ih" sound. Anyways, loved the gag and the video! Very clear and informative. =)

[@numinous4789]

How does this stack up to a Quaife? My Speed 3 came from the factory with LSD, but I'm no longer at the stock 230/250 @ the wheels; I'm now at ~390/385 @ the wheels. The long-term plan is to go EFR7163 and tune it for a flat 380-400wtq curve from 3k-7k and ~500whp at 7k, which should be a very linear and useable curve that has tons of power under it. I wonder if I should look at this or the Quaife when I do so, as auto-x and road courses are in the future.

[@motoiq]

They are different types of diffs, so it depends on driver preference and application. We'll be doing a video/article on the differences between the diff designs, so stay tuned!We'll be doing a video/article on the differences between the diff designs, so stay tuned!

[@mikekojima9761]

I prefer clutch type diffs over helical types, especially on high powered cars because of the action is much more consistent. On high powered cars, helical diffs can slew around which is not cool. Also if you get differential wheelspin, helical diffs can run away and act like an open diff. Finally, helical diffs act like an open diff if one wheel gets up in the air which can cause run away.

[@bujin5455]

Not sure why a clutch powered LSD was selected over a helical for track corner exit duty. Helicals are generally better, as long as you aren't planing to have one tire in the air, and they have super smooth engagement, and no wearable parts.

[@motoiq]

Clutch LSD's are greatly superior for the rear of a car vs helical. They get unstable with higher powered, bigger tired cars and if one wheel starts to break away they act like open diffs. They are also not user tuneable. They are good for moderate power OEM use. They are good for the front of AWD cars.

[@jordangospodinov9896]

Which set up is recommended for front wheel drive car with 262, 300 hp to the wheels

[@motoiq]

I would do an OSG right out of the box

[@mr-t1243]

At some point the clutch type will need to be rebuilt.How does the os-giken compare to a gear type lsd like a quife lsd?

[@motoiq]

In our experience with this diff, not for a long, long, long time in an FWD car of this power level. I really dislike gear type LSD's and will only use one if there is no other choice. They are sort of like open diff deluxes.

[@arkangelsklucifer]

Long ago, there's an article or video regarding WPC treatment on LSD posted by MotoIQ and few others years ago, how it eliminated gear noise and improved lock-on. Do you still recommend on all LSD to get WPC treatment from gears, pinion, to clutch plates, even most expensive LSD on the market? Just being wary what ?not? to WPC on LSD, or WPC treatment will not adverse the function of LSD or transmission parts/gears like dog teeth, hub, block ring, etc. It's probably mind boggling to others, where you want friction, but WPC treatment helps lessen friction and same time strengthen surface; even others had WPC treated the flywheel surface that actually helped engagement with clutch, etc. I would like to see a new video, article if you could break down, WPC this/optional and don't WPC that/ never. or just maybe, there's no limit to WPC treatment on all metal surface?!

[@motoiq]

Yes it works really well!

[@SRZRB]

Do you guys pre lube the clutches?

[@mikekojima9761]

We poured some lube into the diff but didnt dissasemble it to lube them.

[@khurramshehzad6099]

Lsd fitting kesay kertay hay

[@RexinOridle]

For me, Torsen all the way.

[@motoiq]

Torsens are good for the front wheels of AWD cars sort of ok for FWD cars and ok for low powered anything. Not good for serious use.

[@brian6speed]

How are these clutch type diffs driving on street?

[@mikekojima9761]

This diff is pretty smooth, especially once its broken in.

[@kennybo3009]

Which model is best for a 1993 mr2 kswap

[@motoiq]

It depends on your end usage.

[@sonofachef1470]

will this fit a non lim slip diff isf

[@motoiq]

Yes OS makes and application for the ISF

[@tractorback76]

The traction out of corners sucked so bad with my fwd i abandoned fwd forever...

[@carsandcoldbrew6489]

Would this be a good upgrade on an F80 M3?

[@motoiq]

yes

[@ivogiev]

On this type of LSD, can the chatter be fully removed? How does this type of LSD compare to ATB type for a street car? Factory LSD on Hondas are ATB, right? I understand the adjustment possibilities Giken gives, but who drops a gearbox to alter those things and how often?

[@motoiq]

To reduce chatter we WPC the plates and use LSD oil additive. We super dislike most ATB diffs, they don't work once you loose traction completely and act like open diffs. We adjust diffs a lot when racing or drifting.

[@ivogiev]

@@motoiq , I totally understand why Giken is the best option for you and the service you provide. Was asking from the point of owner of daily driven FWD car ( Euro Accord CL7 with engine as a base RSX) used for spirited miles on carving roads in the weekends. Car is currently NA, but may receive 0.5 bar of boost on stock engine or go K24 qith bolt-ons down the road. Once this LSD is installed, do not plan to reopen unless it fails during operation. Which are the ATBs you do not dislike - Quaife or MFactory maybe?

[@motoiq]

All ATB diffs pretty much are relegated to better than nothing but pretty much suck. If you go turbo the OS diff is the way to go for sure.

[@Rawdawg321]

Is your shop open to the public? I have a DC2 integra

[@motoiq]

Yes it is. We don't do basic maintenance jobs such as pads or oil changes, but if you need to overhaul your suspension, build an engine, or set-up a race car we got you covered.

[@Rawdawg321]

MotoIQ send me the info if you can. I pretty much want to do what you're doing to that car for my daily driver.

[@motoiq]

shoot us an email.. [e-mail]

[@Uranus707]

hi how do is it stack up to a cusco rs 1 way?

[@motoiq]

A one way is more for a stockish FWD car.

[@future62]

$1500 for a diff seems reasonable. Isn't a Quaife like $1100? And are Phantom Grips garbage?

[@motoiq]

Phantom Grips are better than having a completely open diff, but they should not be in the same conversation as motorsports level diffs such as OS Giken and Quaife.

[@Sergio-rn7os]

future62 os giken is the best in clutch types. For my luck on my car to install a giken I need two new stubs, the whole rear diff bearings and seals kit that along is $560 extra and installation is like $900. Check out the gtr with quaife fwd diff and os giken rear diff it handles 800 h.p and a shit load of torque like a beast.

[@Sergio-rn7os]

future62 and I forgot to mention let a pro shop install this even tho there is diy videos and it seems easy to do so they fail to mention that if you install the diff and something goes wrong and later it gives you issues your lifetime warrenty won't be validated. Same as my kw v3s, and csf all aluminum high performance radiator. Easy diy that you can do, but the card and registration they make you fill requires the shop name, adreess, and phone number.

[@michaellal7480]

I have the two way lsd can I turn that to a one way lsd?

[@motoiq]

If it is an OS Giken yes you can, but parts will need to be ordered and installed.

[@UHPdriver]

If Mike Kojima says Guy-ken, I’m gonna say Guy-ken

[@user-el2zj3pw5r]

On 700hp rwd, any cons installing lsd?

[@motoiq]

No it only makes things better.

[@JH-jo9wt]

OS Giken and Kaaz offer WPC treatment as a add on option like CP-Carillo...

[@tripointkid]

Can I ask what gear oil was used? Any synchro issues as you try to find a happy medium between chatter and shifting ease?

[@mikekojima9761]

I think motul 90/140 but let me check, we didnt need to put any friction modifier in.

[@TTercel]

In for a response

[@motoiq]

We used Redline MT90. Clutch chatter is not an issue with our DC2. The chatter we refer to is from the diff having a little too much lock when leaving a drive way and the inside wheel "chatters" or "hops". There are no shifting issues to report.

[@tripointkid]

I'm currently using Motul 823511 Gear FF Competition 75W140. There's some mild typical 'parking lot' chatter. It tends to bind more after a few thousand miles. I'll have to try the one you're using Mike.

[@tripointkid]

Anyone have any luck with Motul 75W90?

[@user-ig2ps3ze1z]

if i using 0-400 or highway fast driving. Is lsd is helpful？

[@motoiq]

Yes very much.

[@user-ig2ps3ze1z]

@@motoiq i am sti awd 800 whp , for 0-400 , do i need front and rear OS LSD ?

[@aaronbryan5095]

Will front engine rear wheel drive cars like an 86 benefit greatly from this LSD?

[@brian6speed]

driftbro yes you just need a 1.5 or 2 way depending on ur usage.

[@mikekojima9761]

the stock VLSD is ok while the engine is stockish unless you drift. Then you need a two way. Add power and big tires, then yes a clutch type diff starts to make more sense 1.5 way for grip, 2 way for drift.

[@aaronbryan5095]

What are the benefits of having a bit of lock under deceleration with a 1.5 way?

[@mikekojima9761]

It can help rotate the car to the apex.

[@aaronbryan5095]

Does that mean the driver doesn't need to trail brake as much while still having the car to rotate towards the apex?

[@TheJonny2you]

why this over a quaiffe/factory ITR style diff?

[@mikekojima9761]

It works a lot better, helical diffs don't lock very well and act like an open diff if one wheel gets air or starts to spin. The side gears loose their grip on the case if one side starts to run away.

[@TheJonny2you]

OK, I can see that. i just always thought the torque biasing properties outweighed its negative of not being a a true locking differential. I just love how it feels when a helical/planetary diff sends a little more torque to the outside wheel exiting a corner in a FWD, it feels like cheating.

[@mikekojima9761]

This diff is like that only better!

[@beanshooter5784]

quaiffe is better, yea it acts like an open when one wheel gets away like on ice or if its in the air but you can counter that by tapping the brake causing it to preload and start sending torque to the wheel with traction

[@vonklizzykloudz1303]

yea my ILX needs a LSD bad.. I think if i can get one off a wrecked Si i can save some money T_T

[@GettingthruLife]

A $2,000 part with labor installed into a 4,000 car. Great products but expensive for the general car enthusiast. Great explanation of the how's and benefits.

[@e34boat88]

i cant never spend that much on a diff. i know its good but i just cant do it

[@motoiq]

Speed is money, how fast do you want to go? ;)

[@mart182003]

If you don't have any need for that type of diff why buy it.

[@behindthen0thing]

It's a hobby

[@seigedan]

He is so cute

[@saikosuku_trial6215]

DC2 is an integra type R

[@motoiq]

Yes, but if that's you're whole answer you're only partially right. Though the 97-01 (except 99) Integra Type R is a DC2, so are the USDM 1994-2001 Integra GS-R, JDM 1993-1995 Integra Si VTEC, and the JDM 1995-2001 Integra SiR-G, Type R, Xi-G. Our Project DC2 Integra is a 1996 USDM GSR, so it is a DC2.

[@ianp6829]

mic drop!

[@hobotechMASTER]

better than a quaife?

[@motoiq]

Depends on driver preference and application. We'll be doing a video/article on the differences between the diff designs, so stay tuned!

[@hobotechMASTER]

ive had my quaife for a long time. but my only experience prior were oem lsd's. thanks for the reply!

[@mikekojima9761]

Paraphrasing one of earlier replies, I prefer clutch type diffs over helical types, especially on high powered cars because of the action is much more consistent. On high powered cars, helical diffs can slew around which is not cool. Also if you get differential wheelspin, helical diffs can run away and act like an open diff. Finally, helical diffs act like an open diff if one wheel gets up in the air which can cause run away.

[@john-martin]

Wavetrac

[@doggystyledave]

A bit too stuffy for me. Vick's please

[@mugshotmarley]

Btw, Im with Mike. We pronounced it "gai-ken" as well since back in the late 90s

[@joseillofdez.5272]

Decades of bad pronunciation. Bet you also say 'bride' when talking bout the holding monster seats, as if you were talking about females about to get married.

[@1dickycat]

Joseillo Fdez. Then how are you suposeed to pernounce it??

[@joseillofdez.5272]

"Burito", really weird hahah. kzbin.info/www/bejne/hGKToKWtfM-FpMk

[@yayitzian]

1dickycat bu-ree-do, kinda like burrito, but in an american accent: “ brid “

[@mikekojima9761]

In Japanese "I" is pronounced E

[@HavocStylesJoe]

Front wheel drive, lol!

[@boppernostopper8598]

no one can ever tell me how modena is

[@timtrial3971]

I've never found understeer to be a problem on fwd. Just turn into the corner with brake, let the back come around, then catch it with the throttle and the car straightens up