FIGS OS Giken LSD swap write up
#1
FIGS OS Giken LSD swap write up
Hi guys. Finally done with my LSD swap so I though I would share the experience. Subsequent swap should be pretty straight forward if anyone is interested. Also decided to make both upper arms in the rear and started testing one while the new clevis for the #1 arm is in fab.
http://figsengineering.blogspot.com/...-lock-tcd.html
Thanks Mike
http://figsengineering.blogspot.com/...-lock-tcd.html
Thanks Mike
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#4
http://www.osgiken.net/techcenter.php
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#5
Tech Info Resource
iTrader: (2)
Which also means at some point you'll be back in the diff to change the clutch packs out when they wear out.
What oil did you run in it? Shockproof?
Any reason you chose not to use a silicone sealer?
Also - did you check out the manual on TIS? There is a tool to spread the case a few thousandths so you can easily remove the snap ring. Sounds like you had quite a time getting it out with all the preload on it.
What oil did you run in it? Shockproof?
Any reason you chose not to use a silicone sealer?
Also - did you check out the manual on TIS? There is a tool to spread the case a few thousandths so you can easily remove the snap ring. Sounds like you had quite a time getting it out with all the preload on it.
#6
according to OS Giken, they have NEVER had a diff, even on race cars that required servicing. OS giken recommends you use their own fluid and no LSD additive. In fact they recommend royal purple over redline and since you have to replace it after the first 500 miles (or 10 hours of track use) they suggest a lighter fluid like the royal purple initially, and then switch to their 85/250 os giken fluid...
While it is a clutch pack diff, it's not a crappy clutch pack diff that needs service all the time, they shoudl be good for 100k miles or more.
While it is a clutch pack diff, it's not a crappy clutch pack diff that needs service all the time, they shoudl be good for 100k miles or more.
Which also means at some point you'll be back in the diff to change the clutch packs out when they wear out.
What oil did you run in it? Shockproof?
Any reason you chose not to use a silicone sealer?
Also - did you check out the manual on TIS? There is a tool to spread the case a few thousandths so you can easily remove the snap ring. Sounds like you had quite a time getting it out with all the preload on it.
What oil did you run in it? Shockproof?
Any reason you chose not to use a silicone sealer?
Also - did you check out the manual on TIS? There is a tool to spread the case a few thousandths so you can easily remove the snap ring. Sounds like you had quite a time getting it out with all the preload on it.
#7
Which also means at some point you'll be back in the diff to change the clutch packs out when they wear out.
What oil did you run in it? Shockproof?
Any reason you chose not to use a silicone sealer?
Also - did you check out the manual on TIS? There is a tool to spread the case a few thousandths so you can easily remove the snap ring. Sounds like you had quite a time getting it out with all the preload on it.
What oil did you run in it? Shockproof?
Any reason you chose not to use a silicone sealer?
Also - did you check out the manual on TIS? There is a tool to spread the case a few thousandths so you can easily remove the snap ring. Sounds like you had quite a time getting it out with all the preload on it.
I ran Amsoil 75W 90 severe gear oil. OS Giken suggested a oil change after the first event. It is a clutch pack system but there are so many elements that the frictional surfaces are approved for longer life. The TCD unit they had on display at SEMA was a unit out of the Nuburgring 24 hr Endurance Race and they said it show little signs of wear.
As with anything its important for me to test the hype vs the actual performance. So far cornering dynamics are pretty wicked. I think the E-diff was also causing oscillation of traction that was feeding back into the suspension and disrupting certain damping scenarios. The car just keeps getting better and better. At the moment my thoughts are that any power added is just wasted if it does not make it to the ground. For those 08 and 09 cars out there this should def make it on your list. if you want to go fast and be predictable.
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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
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#8
Driver School Candidate
Hi FIGS,
Very nice write up! I read through the whole thing, I have to say I did not understand every step of it. From a practical standpoint, most cars these days do not come with mechanical LSD, and E-LSD is good enough even on tracks, how is the before and after in straight line and on the tracks would be an interesting measure for the success. Someone in your area can bring their F and compare may be.
Ash
Very nice write up! I read through the whole thing, I have to say I did not understand every step of it. From a practical standpoint, most cars these days do not come with mechanical LSD, and E-LSD is good enough even on tracks, how is the before and after in straight line and on the tracks would be an interesting measure for the success. Someone in your area can bring their F and compare may be.
Ash
#9
Quick question for anybody with a OS Giken TCD
I have a quick question for anybody with the OS Giken TCD.
My shop just finished installing my coilovers this afternoon and are starting to tackle the diff. My question is what additional parts besides the LSD did you have to buy/replace during the install...i.e. gaskets, clamps, bearings, etc?
My guy just called me asking if I wanted him to buy 2 new diff bearings because he wasn't sure if they would be damaged during the install and it will take a little while to order and receive them. Who here replaced their diff bearings or any other component during the install? Thanks in advance.
My shop just finished installing my coilovers this afternoon and are starting to tackle the diff. My question is what additional parts besides the LSD did you have to buy/replace during the install...i.e. gaskets, clamps, bearings, etc?
My guy just called me asking if I wanted him to buy 2 new diff bearings because he wasn't sure if they would be damaged during the install and it will take a little while to order and receive them. Who here replaced their diff bearings or any other component during the install? Thanks in advance.
#10
Lexus Test Driver
iTrader: (10)
I have a quick question for anybody with the OS Giken TCD.
My shop just finished installing my coilovers this afternoon and are starting to tackle the diff. My question is what additional parts besides the LSD did you have to buy/replace during the install...i.e. gaskets, clamps, bearings, etc?
My guy just called me asking if I wanted him to buy 2 new diff bearings because he wasn't sure if they would be damaged during the install and it will take a little while to order and receive them. Who here replaced their diff bearings or any other component during the install? Thanks in advance.
My shop just finished installing my coilovers this afternoon and are starting to tackle the diff. My question is what additional parts besides the LSD did you have to buy/replace during the install...i.e. gaskets, clamps, bearings, etc?
My guy just called me asking if I wanted him to buy 2 new diff bearings because he wasn't sure if they would be damaged during the install and it will take a little while to order and receive them. Who here replaced their diff bearings or any other component during the install? Thanks in advance.
#11
Pole Position
iTrader: (1)
Another thing that is worth noting in the drive-line is the rubberized metal flex joints used instead of Spicer joints. You can see that there are flex zones in between mounts and ours had developed cracks. While it seems that these were cracking in the cavitated portions and perhaps of no consequence. This is a very compliant flex plate though and present on both ends of the the prop shaft. Since there is very little misalignment angle this may be a piece to examine down the road for performance.
#12
90521-34003-rear axle spring clip QTY 2
90311-47019-LH axle seal x1
90311-47018-RH rear axle seal x1
__________________
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BCR - KW - PENSKE - OHLINS - HKS - GREDDY - STANCEPARTS
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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
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
#13
Hi FIGS,
Very nice write up! I read through the whole thing, I have to say I did not understand every step of it. From a practical standpoint, most cars these days do not come with mechanical LSD, and E-LSD is good enough even on tracks, how is the before and after in straight line and on the tracks would be an interesting measure for the success. Someone in your area can bring their F and compare may be.
Ash
Very nice write up! I read through the whole thing, I have to say I did not understand every step of it. From a practical standpoint, most cars these days do not come with mechanical LSD, and E-LSD is good enough even on tracks, how is the before and after in straight line and on the tracks would be an interesting measure for the success. Someone in your area can bring their F and compare may be.
Ash
__________________
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
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
#14
They make it easier but are not necessary. If the installer has a blind carrier bearing puller then the bearings will be spared. Only required parts are the outer axle seals and spring clips on the axles.
90521-34003-rear axle spring clip QTY 2
90311-47019-LH axle seal x1
90311-47018-RH rear axle seal x1
90521-34003-rear axle spring clip QTY 2
90311-47019-LH axle seal x1
90311-47018-RH rear axle seal x1