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What kind of differential does the RX have?

Old 11-09-2018, 11:17 PM
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What kind of differential does the RX have?

As I understand it, they came standard with LSDs, if not, I know that my car has one nonetheless. I always assumed they were Torsens, which are what the first and second generation Miatas came with, and which have a very good reputation. A couple of days ago, someone gave me the impression that they weren't, Torsens, and implied that they weren't very good, but didn't elaborate on what they were. I've autocrossed and tracked with whatever it is that's under there, and like it just fine. I have a Torsen in my Miata, and they are equally competent. So, what do we have?
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Old 11-10-2018, 03:08 AM
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It comes from a different manufacturer(some people call them ToFu; I forgot the full name), but it still is considered a Torque Sensing LSD.

The difference seems to be that the RX-8 LSD doesn't utilize worm gears like Torsen ones. It uses a cone clutch that's supposedly more durable.

That said, I just read this info out of curiosity. I am by no means a diff pro.
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Old 11-12-2018, 11:58 AM
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Tochigi Fuji is the manufacturer.

It's advertised as a torque sensing unit but not a TorSen(tm) unit.
https://www.rx8club.com/series-i-tec...01/#post278604

It's got cone clutches that will wear out over time like a clutch-type LSD but won't explode as easily due to shock loads like a gear-type LSD.
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Old 11-12-2018, 04:32 PM
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Is there a need to run LSD oil ?
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Old 11-12-2018, 07:56 PM
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Originally Posted by NotAPreppie View Post
It's got cone clutches that will wear out overtime like a clutch-type LSD but won't explode as easily due to shock loads like a gear-type LSD.
Does it wear out? I have read that it doesn't actually have friction material like a plate clutch LSD does.
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Old 11-12-2018, 08:36 PM
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Originally Posted by Sydo View Post
Is there a need to run LSD oil ?
nope, plain GL-5 75W-90 or 75W-140.

Originally Posted by UnknownJinX View Post
Does it wear out? I have read that it doesn't actually have friction material like a plate clutch LSD does.
Yes, it does have friction material and does wear out. Odds are, people that only drive on the street won’t wear it out very quickly and won’t notice when they do.
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