ClubLexus - Lexus Forum Discussion - Speed Freaks USA group buy for OS Giken LSD

It is not really a secret that the stock LSD is a weak link of any IS-F being used aggressively on the street or the track, especially the earlier 08 and 09 models. Speed Freaks USA is putting together a group buy on the tried-and-true OS Giken Super Lock LSD. This will be a tiered pricing structure so please post up if you are interested and I will get a list going.

*Update 3/10*
We are so close to the maximum discount level! We are still waiting to hear back from a few people and are finalizing pricing with our diff builder so we can provide a service to those who would like to have us do the rebuild. Because of this we have decided to extend the group buy until this Friday (March 13). Once the group buy is closed we will ask for deposits from those on the list and we will have an official discount level once all the deposits are in. If you are not on the list by Friday, you will not be eligible for the group buy pricing.

For those of you who don't know about OS Giken here are some product details:

The OS Super Lock LSD is the culmination of over four years of extensive research and development that led to a revolutionary LSD design with the capacity to house an unprecedented number of friction plates (up to 28 plates in total). Combined with our patented lock timing system, the Super Lock LSD is able to achieve complete lock in a progressive, smooth, and quiet manner, making it suitable for both street and racing performance.

Superior Design
- Miniaturized pressure ring and a superior spline-through-side-gear design allows for fitment of more friction plates (up to 2x as many as competitors versions), offering true 100% lock capability.
- Patented pressure ring design allows for smooth, progressive locking
- LSD case has a relief cut-out for the cone spring, resulting in minimal cone spring degradation and enhanced durability.

Superior Construction
- All components are chemically heat treated for maximum durability
- All components are constructed from a high-grade steel alloy
Gears are raw-forged for maximum strength
- Clutch disks are precision-machined simultaneously on both sides to extremely tight tolerances resulting in minimal warpage.
- LSD case is machined from a single billet piece to ensure uniformity.

Superior Overall Performance
- The OS LSD standard spec allows for low preload while still retaining a fully progressive 100% lock capability; basically, the vehicle will feel like driving on an open diff in slow turns / street driving, but can still transmit maximum power to the drive wheels under load.
- Operation is ultra quiet, and the progressive locking allows for smooth, predictable locking. Especially when replacing an open diff, equipping OS LSD will completely improve the driving experience while maintaining everyday drivability.
- Due to the precision manufacturing, high-grade materials, and unique design, a break-in period nor rebuild is required for OS Giken LSD’s. OS LSD is purposefully over-engineered to offer the best performing, most durable clutch-type LSD available.
- Aside from the performance advantage and stock-like feel at slow speeds, vehicles equipped with OS LSD are more stable in all road/weather conditions, allowing for a safer driving experience.

Tunability
- Initial torque can be adjusted by using thicker / thinner cone springs
- Lock progression timing can be adjusted by using stiffer / weaker pressure ring springs, allowing the progression of full lock to be fine-tuned to the vehicle/driver.
- Ramp angles can be customized by swapping the pressure ring and iron cross for even more tuning possibilities.
- TCD spec disks can be installed for increased oil cooling and even smoother operation.

The standard "off the shelf" differential for the IS-F is configured as a 1.5-way and comes in the "TCD" version which uses specialized oil channels and pathways to provide maximum oil flow and minimal noise, resulting in exceptionally smooth locking.

There are other options out there with a slightly lower up front cost, I'm sure they may work alright depending on what you're doing but none offer the same reputation and proven performance, tunability and especially durability even under extreme conditions that OS Giken has. Consider that rebuilding the differential isn't exactly cheap even if you are doing most of the work yourself so it is much less expensive in the long run to replace/rebuild just once and be done forever compared to saving a little money up front and potentially having problems which would require having to rebuild again in the future.

Since we cannot advertise anything below 5% please PM me for pricing details and questions.

We have had a HUGE response from this! Here is the list of people who are in and have deposits paid as of 3/23:
1) bnizzle87 *Deposit Paid*
2) TURBO5DAVE *Deposit Paid*
3) slowIST *Deposit Paid*
4) Gearbangin
5) szhark
6) quarius *Deposit Paid*
7) torxuvin
8) KJH *Deposit Paid*
9) gearcase
10) CptAce
11) KdotAmes
12) jsl757 *Deposit Paid*
13) Fii *Deposit Paid*
14) lobuxracer *Deposit Paid*

-Matt M.