[MC968CS]

Hello, I am considering upgrading my stock (option 220) LSD to a true race limited slip plate style differential. The car is used for track work and motorkana's.

They seem available in a 40/60, or 50/80 locking percentage. Which one you choose is largely dependent of the combination of your tire size and your horsepower. For example, if you run a really wide tire, but stock horsepower, you apparently want to go with the 40/60. The reason for this is that you don't have enough power to break it loose as you turn, so the car will push and just not rotate enough. If you run stock size rubber on it, you apparently should up it to the 50/80.

As I run stock HP and will keep the rubber basically stock (R spec compound), I think the 50/80 is the go....and would appreciate any input on the two points below.

<b>Advice areas</b>
1: I am open to comments on that ratio, from those with expereince.
2: I am also wondering if it is feasible or makes sense to use a shorter ratio as I have the 6 speed and never use 6th...so am thinking is there an advantage is changing the gearing ratio overall at the same time through the diff ration, and would appreciate advice?

Thanks.

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[thingo]

I think your logic makes sense Mark, but I put an 80/80 in my 968 and found it pretty benign really, compared with other cars I've driven.Next time I would more likely go with around 50/80 or 40/60, think it might make the car a little nimbler.I presumed your stock is still within spec?
Albins can supply a few options for gears.
Rod

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[savvas968]

HAVE YOU TRIED THE 2 MM THICK PLATES INSTEAD OF THE 1,9 MM <acronym title='Limited Slip Differential'>LSD</acronym> PLATES

AND ADJUSTING IT TO 80% LOCK INSTEAD OF 40%?



You may also like to try putting the 10 plate <acronym title='Limited Slip Differential'>LSD</acronym> from a 928 into the 220 6-plate <acronym title='Limited Slip Differential'>LSD</acronym> casing.

It does fit very well and has added grip with longer life.



the 40/60 etc refer to the ramp angles, and perhaps the 40/60 should better ,but it is relevant to the progress

of the <acronym title='Limited Slip Differential'>LSD</acronym> action.Grip is on the discs and the amount of plates,

the more plates you have the more grip you will have especially with the added power.

Std 6 plate 220 option wears quickly on the track ,and you do get very weird handling

during launching and during cornering.

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[flash]

for the last few days i've been driving around a car with the os giken lsd in it . this is the third one for me. same opinion as the first two. very nice grip but noisy. in the cab, and with the top down, you had to be listening for it. this one is a hardtop. much more noticeable. i had to ask what was back there, because i was concerned about something going on in the transaxle (maybe the beginnings of a problem). just a constant buzz/whirr kind of thing. not horrible, and a quick and small turn of the volume knob took care of it, but definitely there. nice hookup though.



there is some backlash, but i'm not sure yet if it's the diff or not. i'll have the car up in the air today and see what's going on there.

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[94SilverCab]

I had the OS Giken unit installed by RS Barn shortly before they stopped doing service...for the life of me, I can not hear any noticeble difference in sound levels (with a cab) but I can ABSOLUTELY feel the difference in handling.



I LOVE the OS Giken unit and would happily reccomend it to anyone whether for competition or just pure driveability...no questions asked!



Jay

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[flash]

it's really hard to hear it in the cab. but then, i am trained to hear things like that. remember, as a sound engineer, i am supposed to hear all sorts of odd noises, and deal with them.



it shows up pretty well in the hardtop though. but, as i said, it takes very little stereo sound, or any other road noise, to mask it.



and it does perform

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[tamathumper]

I've got a click in my kick pedal you should look at Bob...



What specifically does an <acronym title='Limited Slip Differential'>LSD</acronym> do that I would appreciate?

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[flash]

puts power to both wheels instead of just one. ever see "my cousin vinny?"

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[tamathumper]

Yeah, I understand the concept, even with Posi-Trac, but what does it *do* for me... I never light it up enough to spin one wheel into a cloud of smoke, so,...

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[Rap]

I am looking forward to driving mine with <acronym title='Limited Slip Differential'>LSD</acronym> and seeing the difference. Turn on, tune in, drop out!

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[flash]

lol - ok - if you've never had wheel spin in a corner, then lsd will do nothing for you but put a dent in your cabernet budget

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[Cloud9...68]

Mine came with an <acronym title='Limited Slip Differential'>LSD</acronym> (a Guard torque bias diff, to be exact), so I've never driven a 968 without one. But my hunch is that since the 968 has such a relatively modest weight-to-power ratio, you will seldom fine yourself wanting for traction coming out of corners, unless you've done a lot to either add power, reduce weight, or both. On the street, I seriously doubt it would make much of a difference. I could be wrong, though.

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[flash]

i had to be hot-dogging to get it to break free, but i did it. i also have the guards unit, and for a street car, i really like it. i've never felt wanting on the track either, but the giken does hook up better, though i had to purposely create a situation in order to find out, so who knows if i could ever use the added traction of that diff over mine or not?

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[94SilverCab]

I have been known to drive spiritedly through the corners. I can assure you that the "bite" you get when you downshift into 2nd and corner hard is incredible...

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[flash]

yup - i was pretty impressed at the difference. as i said, i had to force it into a situation that i would normally never get into, so as to see how it behaved, but it did very nicely. if i were setting up a purely track car, i would probably choose the giken over the guards. for a street car, i would choose the guards.

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[Cloud9...68]

I agree. Eventually, I will probably replace the guard with an OS Giken as I get more serious with the track stuff. But given the cost, it's pretty far down the list.

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[flash]

yeah - i don't think it will be an issue for you for a very long time, and when it does become an issue, it will likely still be down on the list of things limiting you.

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[KRAG50]

I just reinstall my trans-axle, ( used) after blowing my 2nd gear syncro hub. The used unit didn't have a <acronym title='Limited Slip Differential'>LSD</acronym>, (It did but I didn't know it) I purchased a OS Giken and have installed it, A few test rides and I haven't noticed more noise, however my car is noisy anyway because of the way it's set-up for track use. I'll be doing a two day DE this weekend so we'll see. Just a note, Giken unit is fully tunable for ratios although I've left mine as received, sport tune, whatever that is.

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[flash]

yeah - it's not a huge noise. it's just a constant whirr, a little like tire noise, but you can tell it's not the tires. if you have other stuff going on, you won't likely hear it unless your ears are trained to hear multiple things.



that's why stuff bugs me. i spent a lot of years as a monitor engineer. that meant that i had to constantly be able to hear each musician on stage, all at the same time, and be able to react to minute changes so i could send to each one of them, the mix they wanted, and all before they had to ask for it. after that i spent a lot of time in recording studios. so consequently little things like this bug me.



lol - you should see my reaction when i walk into somebody's living room and listen to their stereo, knowing that they have not done anything to the acoustics in the room. the tiniest little bounces and pings of untreated walls makes me crazy.



from a purely performance standpoint i am very impressed with the unit.

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[blue968]

Hi Guys,

 

can anybody recommend where to get the OS Giken LSD diff and who has the best price?

 

TY

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