hi @socky it's me again. I'm using a Nismo 2-way LSD on my cefiro. Right now it seems like not locking at all, I'm having a hard time getting my tail sliding out. My friend said that I just need to change the oil, after that it will be tight again. It's been a year since I last changed the lsd oil (redline 75w140). Is this true?
Another test I did was jacking the car up one side. One wheel in the air and another touching the ground. I can turn the wheel in the air with my bare hands, while the other side stays on the ground. (one said, this is normal, there's a free play. Another said this means slipping)
The oil is not going to make a significant change to the way a LSD performs. You might find that some oils will aid in reducing friction and allow the clutches inside to slip a little which is not what you want, but the primary goal is reducing premature wear on those clutches.
Here is where you start.
Go call the Nismo company and ask for a technical rep. Then ask to get a procedure of how to test the clutches in their 2-way LSD. They may already have an instruction that they can email you. While you are there, ask about the correct oil and additive to use in your LSD. Each manufacturer will have a specific oil and additive that works best for their design.
After testing, you may find that the clutches are worn and need to be replaced. If you already know how to R&R the differential, replacing the clutches will be the easy job. The hard part will be installing the LSD unit. If you haven't ever swapped out the differential, I recommend going to a professional. If you don't shim and preload those differentials correctly, you can damage the ring and pinion gears.
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