[EEZATOY]

Ok so here it goes…I’m trying to decide what or more specifically how much I should put into my coupe…



I’ve had my coupe now for almost 8 ½ years and its been my daily driver and I love it but I’m looking to retire in a couple of years and am thinking I would like to have a cab (mmm maybe a paddle shifting DR1 super charged Tip..)…anyway don’t really have room for two cars in the garage (wife’s F150 gets one bay…I know I know…) and I don’t know how much the coupe would be driven if/when I get a cab( still convincing the wife again that I need a convertible).



The real dilemma is my coupe has developed the dreaded pinion bearing issue and I always figured I would add <acronym title='Limited Slip Differential'>LSD</acronym> if I ever needed to fix the pinion bearing. So I am looking for a local place to fix the pinion issue but do I put the <acronym title='Limited Slip Differential'>LSD</acronym> in if I’m going to sell in a couple of years – I also have a new set of high voltage cables and a raid three spoke airbag steering wheel waiting to be installed, it could use new shocks and at least a front end repaint (DD road rash)….so the question is do I keep putting money into it if I will be selling it soon knowing I will never get full costs recovery from the extra work.



Sam

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[Rap]

It sounds as if not only do you know the answer but that you have already made it. You don't mention the costs of what you stated but only that you wouldn't recover it when sold in a few years. Fix what needs to be fixed, sell the coupe and use the proceeds toward the purchase of a cab and add all the goodies you want.

I just bought a 93 coupe for the track that was not on par with my 92 coupe. I've now put in over what the 92 cost which was a mint garage queen. Once you start on the goodie road it's interesting how quickly it adds up and your desire to keep on adding goodies! So if your going to sell the coupe in a couple of years, do your research and find a good cab. Selling the coupe might be used as a point to convince the wife. Or you may want follow Jays advice and buy her diamonds to make your purchase noiseless!

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[DaveN]

I mumble about <acronym title='Limited Slip Differential'>LSD</acronym> every year and now with the Supercharger I think I would like it even more.....however. Everyone here basically tells me to save my money because I'm not tracking the car; just put on better tires. So I have weened myself off the <acronym title='Limited Slip Differential'>LSD</acronym> costs and am trying to just....let it go.

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[Rap]

Dave, your not getting any younger, sure you want to do it that way? I feel much better with a car with <acronym title='Limited Slip Differential'>LSD</acronym>.

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[RS Barn]

Dave,

Ask Jay about his OS Giken <acronym title='Limited Slip Differential'>LSD</acronym> we put in his street car. It changes the way the car handles and has much more feel in the corners. That is a clutch style vs Torsen gear style in most 968s.

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[rxter]

Fix the bearing. Sell the car. Buy a cab with <acronym title='Limited Slip Differential'>LSD</acronym>. Install your goodies. Put the top down and smile - you'll never look back.



Oh, and get in on the last batch of chassis braces. If you like the way your coupe drives you may be disappointed in the flex in a cab - the brace really stiffens it up.

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[flash]

there is an update on this diff now. after dealing with mrmister's car, and trying to resolve the noise in the diff, as well as the odd off-the-line engagement issues, i contacted OS Giken for ideas. i have now confirmed, directly from OS Giken (who is practically in my back yard), that it is NOT designed for use in a transaxle, and is known to have issues with the behavior of the clutches when used in one. further, there is one and only one fluid they have had any success with, and that is only on 2 porsches they know of. all other cars suffer a constant noise, and/or odd engagement issues, particularly off the line. they know this, and admit to it freely. it is the tradeoff for using it in a transaxle, because you can't run the kind of fluid they intended. additives do not work, and are specifically recommended against. this is another situation of something that works well on the track, but is not well suited for street.

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[94SilverCab]

[quote name='RS Barn' timestamp='1354049817' post='135345']

Dave,

Ask Jay about his OS Giken <acronym title='Limited Slip Differential'>LSD</acronym> we put in his street car. It changes the way the car handles and has much more feel in the corners. That is a clutch style vs Torsen gear style in most 968s.

[/quote]



Yes, ask me...I have the OS Giken unit and I absolutely LOVE IT! The car is much more settled and handles like it never did before. It is better in acceleration, beter when I climb a hill, and better in the corners...I drive a cabrio and I'm not a sound engineer, but I have no trouble with noise. I have no regrets whatsoever about the money I spent.



Could I possibly be any clearer?



Jay

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[flash]

as you said, you drive a cab, and maybe you can't hear it. i did, and commented on it when i drove your car. i made the same comment when i rode in the other car at the event that weekend that had one. it makes a racket in mrmister's hardtop. i don't like the problem off the line either. it feels a bit like a detroit locker. with the manufacturer saying they know about it, i don't think it leaves much room for decision in a street car. a track car would be different.



yes, it hooks up very nicely. no, it isn't always quiet. no, it isn't always smooth.



i think you would have been just as happy with any LSD unit. you went from open diff to the giken. big difference in performance, but i doubt you'll be able to see the difference in performance between a giken and any other lsd, on the street. now, if you went out on the track..................



i would definitely get the fluid out of there that was installed, and get the fluid Giken recommends (eneos touring - made for and available at toyota). they were very clear on this.

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[RS Barn]

Original equipment clutch type diffs also chatter a bit compared to open or steel torque biasing. The OS is very smooth compared to them. It also has a completely different lock up pattern both on drive and decel. It makes a "Street" 968 corner much better due to progressive lock and unlock which is almost like trail braking.

I have tried many fluids in OS and haven't had chattering as described. They also suggested heavy fluid in 600 HP cars with extreme loads.

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[flash]

yeah - clutch diffs are generally noisy and odd in nature. it's no surprise this one is as well. there is no denying the performance either. the thing works very well. i would not hesitate to use it in a track car.



it's not really chatter. the clutch oddness is a bit of "grab - let go - grab" that makes for a "pop" off the line, like something has to let go first. the noise is a constant whine, similar to the pinion bearing, but a LOT quieter, and a different note. in a cab i can see somebody mistaking it for tire noise.



regarding the fluid, they said to run the enous, and that while other fluids might work, they would result in the behaviors i described, and that only the enous would stand a chance of quieting it down.

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[RS Barn]

I would rather run a "slightly" noisy diff that works great than a quiet one that doesn't do much.

The GT torsens are a bit whiny as well. Possibly due to tighter tolerences.

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[flash]

i've never heard anybody say anything about the gt making any noise, and mine certainly doesn't, nor any of the ones in any of the other cars i've been in. if it did, it would be out of my car in a blink. i won't tolerate that in a street car. a street car diff has to be silent.



again, the giken seems to be fine for a 968 track car, but it's 0 for 3 in a 968 street car in my book, and since even the manufacturer says it is not designed for or intended to be used in a transaxle, and they said the clutches would behave oddly, i think that's good enough for me.

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[tamathumper]

Any idea why they work in a transmission, yet are not suited for a transaxle? What's the diff?

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[94SilverCab]

[quote name='RS Barn' timestamp='1354244726' post='135497']

I would rather run a "slightly" noisy diff that works great than a quiet one that doesn't do much.

The GT torsens are a bit whiny as well. Possibly due to tighter tolerences.

[/quote]





+ 1,000 Pete...the performance difference is worth any small amount of noise...I really don't care if I can't get Carnegie Hall sound from my stereo when I'm roaring through the curves.. <img src="/forum/images/smilies/968/3gears.gif" class="smilie" alt="" />



Jay

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[flash]

i think you are in the minority there by a long shot.



i've driven both the OEM and the Giken clutch diffs, the OEM torsen, and the Guards, as well as the open diff. i don't like the feel of either clutch diff on the street. they are too touchy. up at the limits they can make for better push out of a corner, but at lower speeds, they are almost fighting you. the performance difference between the Torsen types and the clutch types is too small to put up with the noise and problems. this is a GT, not a sportscar. IT's a street car, not a race car. i don't see the reasoning behind trying to make it something it's not. there are better cars for that.



more importantly, if you're driving fast enough on the street that you need a clutch diff, then you need to go out and get a track car.



even more importantly, i had a long conversation with them, and was prepared to drive over to them to try to fix the problem in the car that was here, since they are only 15 minutes from me. in the end the result of the conversation was that the manufacturer does not recommend the diff in this application.



if you want to go against manufacturer recommendations, AND you are wiling to put up with the pop off the line, AND the low speed issues, AND the constant noise, all in a street car that would never be able to take advantage of any performance bump over other lsd diffs, feel free. everybody has their own priorities.

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[EEZATOY]

Thanks for all the advice/opinions - the things driving my delemma were the future availably of DR1 products. On that point I can now can say I have a stock pile of DR1 stuff and I'm on the list for the last run of cab chassie braces (the only thing I didn't get that I would have purchased was the clutch line - which I have on in the coupe already. So I'm ready to update the cab and if I don't get one I will have a garage sale....I'm assuming there will still be a market for DR1 products (especially new never installed).



The other was the failling pinion bearing and whether to up grade to <acronym title='Limited Slip Differential'>LSD</acronym> at the same time. I will fix the pinion and If I do the <acronym title='Limited Slip Differential'>LSD</acronym> I will be lookiing for low milage stock unit most likly (all extraneous thoughts aside the OS Giken unit is just to expensive with the probablity of not keeping the car). Also after driving around in the rain the last couple of days has made me realize that even if I get the cab I will still need another car from time to time....and this one is already paid for....also most of the mods I'm looking at will transfer to another car (other than the <acronym title='Limited Slip Differential'>LSD</acronym>). So I think I will probably continue to experiment/improve the coupe without getting crazy (read no respray etc) and see how the cab thing plays out....



Sam

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[Rap]

Wish you luck on improving your coupe without going crazy! Lol

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[EEZATOY]

True that...but remember its not like I dislike my car and like the poster says its not a logical choice



a 968 never is.....

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[Rap]

But the mods will make it soooo much better! Not busting your chops but speaking from recent personal experience! Lol

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