viperbilliam
Enthusiast
So Mark, you put in a Quaiffe in your 08 (replacing the Giken)?
OS Giken Differential in Viper
- Thread starter Canyon707
- Start date
So Mark, you put in a Quaiffe in your 08 (replacing the Giken)?
Mark always had the quiaffe in his car. Giken was just released and has yet to try it.
viperbilliam
Enthusiast
I think I'm getting confused. I thought the Gikens were OE in the Gen IVs.
Gen IV diff is ViscoLok: very different from this. BTW, I fried mine after 15,000 miles of mostly highway driving...max 4 hours of track time at 80-90% of car's capability, no 1/4 mile runs, no street racing. If it happens again, I'll go with this Giken unit.
mjorgensen Woodhouse
Enthusiast
This will be dependent on the usage, could be true for drag racing, but that would be it in my book. The Quaife will always be faster on the track and safer on the street because of its ability to help steer the rear end and keep it going straight behind you even when the wheels are slipping.
j-rho
Enthusiast
Here's a really nice article on the guts and tuning of the OS Giken diff, most of the tech applies to any clutch-type diff. Though the car it's going into is an NSX, the same principles apply to the Viper.
Project NSX Part 2, Tuning a Limited Slip Differential; Tricks of the Pros
Project NSX Part 2, Tuning a Limited Slip Differential; Tricks of the Pros
Canyon707
Enthusiast
Great reading here
mjorgensen Woodhouse
Enthusiast
Great article, may change my thinking a bit, but would really require a owner to know what they are doing to optimize it, then be able to detect any wear that would need to be re-tuned out of the diff. Sounds like a winner for a serious racer that is capable of taking the diff in and out to adjust it to their liking. Not the typical Viper owner though I suspect.
Thanks for sharing!
Thanks for sharing!
JAY
Enthusiast
Would be interesting to see track time differences in a viper from both types of differentials . Other sites with different cars show the advantage going to the OS GIKEN , in lower road track times. 
I have the giken in my car for a few hundred miles now. I havent been able to really push it since i did 3.33s at the same time which required break in but I can tell you i did a few spirited runs and was impressed. Under hard acceleration the car stayed dead straight. I am looking forward to some track time.
From everyone i spoke with the giken is the way to go.
From everyone i spoke with the giken is the way to go.
Cop Magnet
Enthusiast
Geez, can't wait till Spring when someone might bump this thread with something useful in the way of info. You two seem to be the only ones who've done it and no real feedback yet. Aside from the hard spirited runs staying dead straight anyway. Not to be unappreciative of your beta input, as it were, but get back to us when you know more.
Canyon707
Enthusiast
I think it gives you more power to the tires. I have run it on the track but, I don't consider myself the road racer of the day. All I can say is it hooks up better, it improved my drag times by nearly .5 second. The diff is very strong out of the hole. I have sheared my driver half shaft on a burn out. Shifting gears really locks up the Giken no slack no slipping just bites and goes. The one thing I do know comparing the two the 04 OEM diff is pretty weak. I don't think you can break the OS Giken. I guess you can compare it to the stock hoops on the car versus a real rollbar.
Yeah I guess Canyon and I are the only ones thus far but I am sure there will be more soon. Unfortunately the weather here in NY hasnt cooperated much so I havent had much seat time.
pteam
Viper Owner
I just ordered one from JonB and will have it mid January after I get back from Hawaii. However I'm in North East Ohio and lots of snow and will not get to test it out with any hard driving. I'll be lucky if I get to take it out once for some slow driving in the cold lol
Canyon707
Enthusiast
The harder I drive this car the better it gets. This OS Giken is one heck of a Differental.
Cop Magnet
Enthusiast
Track feedback! We need track feedback!
pteam
Viper Owner
sorry buried in snow... 
mjorgensen Woodhouse
Enthusiast
Just today I'm installing a test Giken in my Viper. I hope to trailer it out of the wintry weather and get some real feed back to Unitrax. If I like it I keep it if not back to the Quaife. I will also be trying a dozen different spring combinations that will better suit my driving style and autocrossing so in the end I hope to have a winning combo I'm comfortable recommending over and above our normal Moton/Bach set up.
My Solo season will start soon and also the instructing at the tracks. I will let you know of course how things are progressing from this end along with Nader and the guys. Install is going well and it does look like a very stout unit.
My Solo season will start soon and also the instructing at the tracks. I will let you know of course how things are progressing from this end along with Nader and the guys. Install is going well and it does look like a very stout unit.
TrackAire
Enthusiast
Mark,
Did you see the comparison in Grassroots Motorsports mag with the Giken, Quaife and one other diff I can't think of right now? It is available online on their website. Sounds like the Giken is the hot ticket for autocrossing with the standard setup. I guess the drifter guys tighten it up even more with different spring settings.
Will the Giken also help you slow down more under deceleration since both rear wheels slow the car down (instead of one possibly free wheeling)? That might help in autocrossing since it may make the car more predictable when coming into a corner under compression braking. Let us know your thoughts on this.
Cheers,
George
Did you see the comparison in Grassroots Motorsports mag with the Giken, Quaife and one other diff I can't think of right now? It is available online on their website. Sounds like the Giken is the hot ticket for autocrossing with the standard setup. I guess the drifter guys tighten it up even more with different spring settings.
Will the Giken also help you slow down more under deceleration since both rear wheels slow the car down (instead of one possibly free wheeling)? That might help in autocrossing since it may make the car more predictable when coming into a corner under compression braking. Let us know your thoughts on this.
Cheers,
George
JAY
Enthusiast
Anyone have updated info on this subject ? Considering the GKN ? 
dave6666
Enthusiast
I put one in my GTS earlier this year along with some gears. You want the good, the bad, or the ugly?
eucharistos
Enthusiast
yes x 3
(thought you would do a separate thread on the subject, here is good too)
tia
dave6666
Enthusiast
You want the good 3 times? The bad 3 times? The ugly 3 times? Total of 9 times?
I have had mine in my car now for about 3000 miles including several track events and absolutely love it. Straights line traction is vastly improved and the car stays dead straight. In the corners the clutches work flawlessly provide great stability out of a corner.
Couldn't be happier.
Couldn't be happier.
Anyone have updated info on this subject ? Considering the GKN ?
After 2 years and 9 months, my Gen IV differential lost its positraction function. ( I felt something was wrong at Homestead a week ago and had it checked.) It's still driveable but I will not be doing any spirited driving until it is replaced. I am having a Giken put in late next week. We chose the Giken because we believe that it is the most robust piece available for my power level.
I will let you know what I think after breakin and testing.
I will let you know what I think after breakin and testing.
dave6666
Enthusiast
Wow. What a perfect setup to my ugly segment. They clearly state on their web site no break-in. Even put it in bold. But I have statements from the vendor I bought it from, from several owners, of what to expect, what happens during break-in.
Bottom line...
OSGIKEN LIES TO YOU.
Plain and simple.
I'm sure there will be a reply by some that have a stake in this, but tread softly. As usual, I have records to substantiate everything I say.
With now 2K miles on mine the non exsistent break-in effect still exists, although not as frequently.
To all that are considering this product, carefully evaluate your application.
Frequenty Asked Questions | OS GIKEN
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Dave. You have a Gen II. I have a Gen III with a modified Gen IV tranny. After reviewing the pros and cons of replacing the stock Gen IV diff with a Quaife or a Giken ( with special attention given to my car's power levels 685/615 to the rear wheels), it was determined by a number of individuals from separate enterprises, including some with very high automotive mechanical skill sets, that the Giken would be best for my vehicle and the way it is utilized. None of those individuals had/has a dealer or distribution relationship with Giken. Their well thought out and reasoned opinion made sense to me. With that said, I think that if I was running a bit less power that I would have selected the Quaife.
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