OS Giken LSD vs Torsen LSD differences.....
#1
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Thread Starter
OS Giken LSD vs Torsen LSD differences.....
As my search continues I was weighing the debate of buying a 2008 and putting on the OS Giken LSD with the Ohlins coilovers because of the price you can get the 2008's for, or just getting a 2010+ with the Torsen LSD and upgraded suspension in the 2011's if I went for a 2011+ MY?
Just wanted to see what you guys thought of the two and what you think is better? Would you really notice the difference with the OS Giken LSD or would the Torsen be just as good?
Just wanted to see what you guys thought of the two and what you think is better? Would you really notice the difference with the OS Giken LSD or would the Torsen be just as good?
#2
This older post from Mike@FIGS provides the best explanation:
https://www.clublexus.com/forums/is-...ml#post8240397
https://www.clublexus.com/forums/is-...ml#post8240397
Its a fairly large difference between the OSGiken TCD and the Factory LSD. The factory uses a Torsen type which requires a large slip event to engage or a certain number of slip revolutions to engage the other axle and at that the other axle is only splitting torque the with the gripping axle by some ratio. If one wheel loses traction completely then 0 torque is transferred to the other wheel. It also only takes the input torque and divides it, so it does not work under coast conditions.
I also found this handly animation
Diferencial Torsen (Autoblocante) / Self-locking Torsen Differential - YouTube
The OSGiken TCD uses a multi element clutch type engagement with a conical washer and splined gears to apply more and more loading to the elements.
This means that it will allow full 100% locking of both axles at the terminal torque of the loading mechanism. This is a much more progressive lock feel and has more impact in a corner because it gives you a stronger vector through the corner. The driving sensation is that you are being pulled through the corner with the gas pedal vs sliding to the outside gradually with an open diff and simply holding with a Torsen. The point at which the full lock occurs is tunable and the TCD type for the IS-F has through holes in the clutch plates to damp noise and smooth the function quite a bit. I have never felt a "hit" when full lock occurs which does happen on some of the superlock LSD's apparently.
The other thing is that the OSGiken is 2-way, meaning under acceleration and braking the clutch is working. I feel that engine braking with the F transmission is much more effective and stable with the change. Though our car is pretty neatly tuned in other suspension areas so it would hard to give a perspective on a purely stock vehicle.
Hope this helps.
Mike
I also found this handly animation
Diferencial Torsen (Autoblocante) / Self-locking Torsen Differential - YouTube
The OSGiken TCD uses a multi element clutch type engagement with a conical washer and splined gears to apply more and more loading to the elements.
This means that it will allow full 100% locking of both axles at the terminal torque of the loading mechanism. This is a much more progressive lock feel and has more impact in a corner because it gives you a stronger vector through the corner. The driving sensation is that you are being pulled through the corner with the gas pedal vs sliding to the outside gradually with an open diff and simply holding with a Torsen. The point at which the full lock occurs is tunable and the TCD type for the IS-F has through holes in the clutch plates to damp noise and smooth the function quite a bit. I have never felt a "hit" when full lock occurs which does happen on some of the superlock LSD's apparently.
The other thing is that the OSGiken is 2-way, meaning under acceleration and braking the clutch is working. I feel that engine braking with the F transmission is much more effective and stable with the change. Though our car is pretty neatly tuned in other suspension areas so it would hard to give a perspective on a purely stock vehicle.
Hope this helps.
Mike
#3
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Thread Starter
Thanks for the link and post. I see you added it to your IS350, was the difference noticeable immediately?
#5
Without a doubt. The best way to describe the difference is to think of the OS Giken TCD as a mechanical torque vectoring differential but without an ECU to dictate how much torque should be applied to the outside rear wheel while cornering. You simply apply more power via the gas pedal in order to progressively add more torque to the outside rear wheel which will help steer your car around the corners and have a high corner-exit speed while maintaining outstanding traction and stability.
#6
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Thread Starter
#7
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Thread Starter
Without a doubt. The best way to describe the difference is to think of the OS Giken TCD as a mechanical torque vectoring differential but without an ECU to dictate how much torque should be applied to the outside rear wheel while cornering. You simply apply more power via the gas pedal in order to progressively add more torque to the outside rear wheel which will help steer your car around the corners and have a high corner-exit speed while maintaining outstanding traction and stability.
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#9
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Thank you redspencer for posting that. FIGS's did a nice job of explaining the differences. The only thing I want to correct is that the standard version of the OSG is a 1.5-way, not a 2-way. However, it can be configured as a 1.1-way or 2-way if the user wants. Perhaps one of the largest benefits of the OS Giken LSD unit compared to the the factory torsen and other competitors is the durability.
We can put together a group buy for OS Giken units if there are a couple people interested
-Matt M.
We can put together a group buy for OS Giken units if there are a couple people interested
-Matt M.
#10
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#14
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you are correct, a torsen unit will never wear out for the lifetime of the car. however, due to it being a gear type just remember if for what ever reason you lift a rear wheel, that Torsen will act as a open diff and not lockup where as with a clutch type it will still lockup.
#15
Lexus Champion
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Thank you redspencer for posting that. FIGS's did a nice job of explaining the differences. The only thing I want to correct is that the standard version of the OSG is a 1.5-way, not a 2-way. However, it can be configured as a 1.1-way or 2-way if the user wants. Perhaps one of the largest benefits of the OS Giken LSD unit compared to the the factory torsen and other competitors is the durability.
We can put together a group buy for OS Giken units if there are a couple people interested
-Matt M.
We can put together a group buy for OS Giken units if there are a couple people interested
-Matt M.
I'd also be interested depending on what kind of discount we can get.