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You may be correct in that a torsen should last longer than some clutch pack type diffs but I would only believe that to be true under very conservative driving. I'll also go out on a limb and say that majority of people who only put their car around on the street are not looking to upgrade to an aftermarket LSD unit.
My car came with a torsen stock and after 65,000 miles (and to be fair a lot of track days ) the LSD is trashed cannot lock anymore. I have other less expensive options available to me but I chose the OSG unit because of it's proven performance, tunability and especially it's durability even under extreme conditions. Like you mentioned- the reputation of never needing rebuilds contributes to it's higher price tag but it is well worth it, IMHO. Rebuilding the diff isn't exactly cheap even if you are doing most of the work yourself so I would rather do it just once and hopefully be done forever vs saving a little money up front but having problems and having to rebuild again in the future. The way I see it the OSG is likely to be the least expensive option in the long run if it holds up as long as all the other OSG units I've seen, and I have no reason to believe it won't.
As for putting together a group buy, we are a go. I will have the details up ASAP.
-Matt M.
Does it mean the 08-09 e-lsd is better if the MY 10+ mechanical LSD is trashed since it doesn't have e-lsd. Also, how does OSG work with 08-09 equipped with E-LSD ? Does it function at the same time ? The E-LSD uses rear brakes to lock and wouldn't it causes excessive/unnecessary wear on the rear brakes when the OSG locks the wheels ? I'll also be interested in getting OSG, but there are concerns how well the 2 systems work with each other in MY 08-09.
Also, how does OSG work with 08-09 equipped with E-LSD ? Does it function at the same time ? The E-LSD uses rear brakes to lock and wouldn't it causes excessive/unnecessary wear on the rear brakes when the OSG locks the wheels ? I'll also be interested in getting OSG, but there are concerns how well the 2 systems work with each other in MY 08-09.
Based on my personal experience with the OS Giken TCD and my IS350 (which utilizes an eLSD as well), it's best to disable the eLSD in order to fully utilize the performance/locking capability of the TCD, IMHO.
On vehicles such as the 10+ IS-F, which incorporate both an eLSD and Torsen LSD, having this combination is beneficial since the eLSD will prevent the inner rear wheel from spinning freely should it ever lift off the ground (which would have caused the Torsen to behave like an open differential).
With the OS Giken TCD and the eLSD activated, I find the abrupt braking of the inner rear wheel from the eLSD to interfere with my driving line (impacting predictability) and can hinder the maximum traction capability of the outer rear tire as the differential attempts to apply additional torque to that wheel (impacting performance potential). With the eLSD disabled, maintaining my driving line is much easier and the ability to throttle-steer around corners is greatly improved.
Disabling the eLSD on an IS-F is trickier to do than on an IS350 as it requires you to perform the pedal dance instead of simply holding down the TRAC button for 3 seconds like on the IS350. I personally disable my traction/stability control and eLSD each time I step into my car as I find the OS Giken TCD perfectly capable at maximizing traction to each rear tire and does an even better job than VDIM, whether it's rain or shine (not sure about snow though as I'm in Florida).
Why do everyone buy the 2500$ OSG when you can have an ATS for 1200$ ??
What am I missing?
Oil change interval and potential long term noise (though none observed yet) are the 2 main differences based on Biggu's review of the ATS. The TCD diff for the ISF has the through hole lubrication on the clutch plates to ensure quiet operation for the long run.
The OSG is also tunable via spring preload whereas the ATS requires clutch plate changes. This likely does not mean much to the average consumer that wants a plug and play solution and will never pull the diff once installed.
I would also add as a Performance dealer that has personally installed this unit we can beat any price, offer the best support, and we also offer a complete install package including our high performance Poly bushings for the pinion ears and rear subframe. OSG has strict MAP policies which should preclude the concept of a group buy. If you pay less than MAP then bottom line you jeopardize support if anything is required down the road, just food for thought.
__________________ Redefining Lexus Aftermarket Parts Since 2001 -- We are your Lexus suspension experts--
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Oil change interval and potential long term noise (though none observed yet) are the 2 main differences based on Biggu's review of the ATS. The TCD diff for the ISF has the through hole lubrication on the clutch plates to ensure quiet operation for the long run.
The OSG is also tunable via spring preload whereas the ATS requires clutch plate changes. This likely does not mean much to the average consumer that wants a plug and play solution and will never pull the diff once installed.
I would also add as a Performance dealer that has personally installed this unit we can beat any price, offer the best support, and we also offer a complete install package including our high performance Poly bushings for the pinion ears and rear subframe. OSG has strict MAP policies which should preclude the concept of a group buy. If you pay less than MAP then bottom line you jeopardize support if anything is required down the road, just food for thought.
Completely understand but there is also the "silent metal" version from ATS which doesn't require as much maintenance as the carbon version. From ATS directly, the silent metal is a bit less performance than the carbon version but we're talking tenth of seconds on a lap.... I don't think that's where majority of ISF owners are.
Completely understand but there is also the "silent metal" version from ATS which doesn't require as much maintenance as the carbon version. From ATS directly, the silent metal is a bit less performance than the carbon version but we're talking tenth of seconds on a lap.... I don't think that's where majority of ISF owners are.
Correct, its just unclear as I have not had anyone install the silent version. It does not look like there is through hole lubrication in the metal version, so just drawing a comparison to the information at hand. They show certain configurations that offer silent operation after break in but the higher performance models still indicate noise. The TCD from OS offers more clutch elements (higher perfromance) and no noise. So I guess its up to the end user to determine what is best for their use case. http://www.ppi-ats.com/LSD/Silentl_LSD.html
__________________ Redefining Lexus Aftermarket Parts Since 2001 -- We are your Lexus suspension experts--
BCR - KW - PENSKE - OHLINS - HKS - GREDDY - STANCEPARTS
Links - Arms - SuperPro Poly Bushings - Solid Bearing Conversions - Motor Mounts
RB BBK's and 2P Rotors, G-Loc pads, Radium Fuel Systems
Custom Fabrication Design and Machining - Industrial 3D Printing - Laser Cutting 2018 USTCC Sportsman Class Champions - 2018 NASA ST5 National Champions
Correct, its just unclear as I have not had anyone install the silent version. It does not look like there is through hole lubrication in the metal version, so just drawing a comparison to the information at hand. They show certain configurations that offer silent operation after break in but the higher performance models still indicate noise. The TCD from OS offers more clutch elements (higher perfromance) and no noise. So I guess its up to the end user to determine what is best for their use case. http://www.ppi-ats.com/LSD/Silentl_LSD.html
I just ordered a silent version. I think I'll be the first to review it!!
I just ordered a silent version. I think I'll be the first to review it!!
which cam option did you choose?
__________________ Redefining Lexus Aftermarket Parts Since 2001 -- We are your Lexus suspension experts--
BCR - KW - PENSKE - OHLINS - HKS - GREDDY - STANCEPARTS
Links - Arms - SuperPro Poly Bushings - Solid Bearing Conversions - Motor Mounts
RB BBK's and 2P Rotors, G-Loc pads, Radium Fuel Systems
Custom Fabrication Design and Machining - Industrial 3D Printing - Laser Cutting 2018 USTCC Sportsman Class Champions - 2018 NASA ST5 National Champions
03-16-16 | 07:36 AM
) the LSD is trashed cannot lock anymore. I have other less expensive options available to me but I chose the OSG unit because of it's proven performance, tunability and especially it's durability even under extreme conditions. Like you mentioned- the reputation of never needing rebuilds contributes to it's higher price tag but it is well worth it, IMHO. Rebuilding the diff isn't exactly cheap even if you are doing most of the work yourself so I would rather do it just once and hopefully be done forever vs saving a little money up front but having problems and having to rebuild again in the future. The way I see it the OSG is likely to be the least expensive option in the long run if it holds up as long as all the other OSG units I've seen, and I have no reason to believe it won't. 
