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Z1 LSD compared to others

Originally Posted by Hotrodz I have been running a Wavetrac for quite a while and I not had any issues and it has performed as advertised. One of the pluses

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Old 03-16-2020, 09:43 PM   #16 (permalink)
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I have been running a Wavetrac for quite a while and I not had any issues and it has performed as advertised. One of the pluses with Wavetrac is their lifetime warranty. The warranty is also transferable if you decide to sell it or it with the car.
How is the wave trac for daily driving ...any issues with low speed turning chatter ..tire wear etc
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Old 03-16-2020, 10:05 PM   #17 (permalink)
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How is the wave trac for daily driving ...any issues with low speed turning chatter ..tire wear etc
For daily driving, it is actually the best. The OS Giken is quite but will wear the tires more.
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Old 03-16-2020, 10:09 PM   #18 (permalink)
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How is the wave trac for daily driving ...any issues with low speed turning chatter ..tire wear etc
The reason I went with Wavetrac was because it is what the OEM should be. It just as quite and it has much superior performance. There is no chatter or binding like with a clutch type LSD. The maintenance is the same and you should not have any issues with heat unless you race on short winding tracks or frequent canyon roads like the Dragon.
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Old 03-17-2020, 05:57 AM   #19 (permalink)
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Z1 is a generic Helical Geared Diff much like the Quaife but without the name brand or reputation, assuming a re-branded Kaaz or Tomei given the pricing. Wavetec is a much better type of geared differential for really not much more, I would have gotten it if I had known about it. The real question you should be asking is geared (Wavetech) or clutch type? Which, for me, is basically are you willing and able to adjust and tune your clutch diff setup based on your performance needs or do you want a pretty good one size fits all no maintenance diff?
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Old 03-17-2020, 08:32 AM   #20 (permalink)
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Z1 is a generic Helical Geared Diff much like the Quaife but without the name brand or reputation, assuming a re-branded Kaaz or Tomei given the pricing. Wavetec is a much better type of geared differential for really not much more, I would have gotten it if I had known about it. The real question you should be asking is geared (Wavetech) or clutch type? Which, for me, is basically are you willing and able to adjust and tune your clutch diff setup based on your performance needs or do you want a pretty good one size fits all no maintenance diff?
From the info I think the geared style would be a better fit for me ....stock like maintenance less aggressive for daily driving and would perform well for occasional drag strip runs ...from the info on the clutch style ..they seem to be better for more track and drift setups and less daily driving .....if I’m understanding the info correct
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Old 03-17-2020, 09:31 AM   #21 (permalink)
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From the info I think the geared style would be a better fit for me ....stock like maintenance less aggressive for daily driving and would perform well for occasional drag strip runs ...from the info on the clutch style ..they seem to be better for more track and drift setups and less daily driving .....if I’m understanding the info correct
OS Giken do just fine for daily driving as long as you use the OS Giken diff fluid. It does require more changes and a diff cooler if you track it or drive mountain roads. Wavetrac will be cheaper over time. It won't work as well but it will do good for the most part.
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Old 03-17-2020, 12:24 PM   #22 (permalink)
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OS Giken is totally fine for daily driving, as long as you don't mind higher upfront cost and the much pricier diff fluid.

If my car were daily only, I don't think I'd be willing to justify the cost and just go with a Wavetrac or Quaife. Now, if I did want the characteristics of a clutch type LSD and also had to daily the car, the OS Giken would still be my first choice, because unlike other aggressive clutch LSDs I've tried in other cars, there's no perceivable lockup noises or binding on tight turns.
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Old 03-17-2020, 02:23 PM   #23 (permalink)
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I have never put my Z on a road course, but I can say that I have never noticed my VLSD opening up in a straight line, as a forced induction street car. Sometimes when I tried to do donuts I would experience it opening if I didnt get the tires spinning good before starting to slide. But in a straight line, nope, not for me. 60,000 miles on my car.
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Old 03-17-2020, 02:27 PM   #24 (permalink)
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OS Giken do just fine for daily driving as long as you use the OS Giken diff fluid. It does require more changes and a diff cooler if you track it or drive mountain roads. Wavetrac will be cheaper over time. It won't work as well but it will do good for the most part.
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OS Giken is totally fine for daily driving, as long as you don't mind higher upfront cost and the much pricier diff fluid.

If my car were daily only, I don't think I'd be willing to justify the cost and just go with a Wavetrac or Quaife. Now, if I did want the characteristics of a clutch type LSD and also had to daily the car, the OS Giken would still be my first choice, because unlike other aggressive clutch LSDs I've tried in other cars, there's no perceivable lockup noises or binding on tight turns.


My OS Giken is seamless for a DD. You don't know it's there until you smash the loud pedal. Then you are going places.
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Old 03-17-2020, 02:50 PM   #25 (permalink)
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[QUOTE=phunk;3916130]I have never put my Z on a road course, but I can say that I have never noticed my VLSD opening up in a straight line, as a forced induction street car. Sometimes when I tried to do donuts I would experience it opening if I didnt get the tires spinning good before starting to slide. But in a straight line, nope, not for me. 60,000 miles on my car.[/


I don’t plan on putting it on a road course ...it would be dragstrip about every other week depending on work hours ...and the rest would be daily driving and street fun ....I would consider the 45k miles on the vlsd to be mild and it might not be “shot” ...all the info I get about the vlsd is that they are garbage ..and I’m sure the aftermarket lsd are much better without a doubt.
Are you still using your vlsd and how much abuse has it taken ?
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Old 03-17-2020, 03:20 PM   #26 (permalink)
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I don’t plan on putting it on a road course ...it would be dragstrip about every other week depending on work hours ...and the rest would be daily driving and street fun ....I would consider the 45k miles on the vlsd to be mild and it might not be “shot” ...all the info I get about the vlsd is that they are garbage ..and I’m sure the aftermarket lsd are much better without a doubt.
Are you still using your vlsd and how much abuse has it taken ?
I havent been driving my Z the last couple years as its always apart for R&D related activities. But for many years it was my only car. I beat the piss out of it. Justins Z ran the 9.9 and countless low 10 second passes on the stock VLSD also.

I think its reputation for being junk came from the road course community. I am not aware of any complaints to it opening in a straight line, and thus I dont see how one can perform better in a straight line. If they start to open up at higher mileage, I dont know... I can only speak to the cars I am involved in which have not had more than 60-70k on them
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Old 03-17-2020, 06:00 PM   #27 (permalink)
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I think its reputation for being junk came from the road course community. I am not aware of any complaints to it opening in a straight line, and thus I dont see how one can perform better in a straight line.
Anyone ever see the inside of one and can describe how it works internally? Sounds like there's static locking going on, which goes against how I understand the VLSD to work

My understanding is that the fluid worked reactively through shear forces generated by differences in wheel speed. Making it initially like an open LSD until one wheel spun differently from the other, and then open again when the fluid got hot enough that viscosity fell.
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Old 03-17-2020, 06:14 PM   #28 (permalink)
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Your description matches my very basic understanding of them, but I have never studied them in depth since I haven't had any issues/concerns to inspire it. Im sure it happens much more quickly than our perception.. it wouldn't be worth having if it were to allow substantial one tire fires before waking up and locking.
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Old 03-17-2020, 06:15 PM   #29 (permalink)
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Anyone ever see the inside of one and can describe how it works internally? Sounds like there's static locking going on, which goes against how I understand the VLSD to work

My understanding is that the fluid worked reactively through shear forces generated by differences in wheel speed. Making it initially like an open LSD until one wheel spun differently from the other, and then open again when the fluid got hot enough that viscosity fell.
https://www.youtube.com/watch?v=DscnU5bN9-8

This is about the best info I found about how it works ...but I don’t understand how it functions to lock
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Old 03-17-2020, 06:38 PM   #30 (permalink)
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All I know is what I have experienced and for the most part phunk is correct. If you are going to stay on perfectly straight and flat roads you will not have a problem. What I experienced on straight roads with some bumps or undulation the car will steer to the side that is receiving the grip as the other side has to catch up. This can make the car very unpredictable under speed and acceleration. If this happens on a turn it can be just that more exciting. If you want to complicate things more, leave the VDC on so it can help you!

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