Originally Posted by TeamRX8

well I’ve been in the game a bit and haven’t heard of many failures, the few of which I know of were really high mileage. Including the one I donated mine for a replacement.

pretty sure the springs mentioned are only for preload to keep a wheel from spinning excessively if it comes off the ground like a Torsen will, though they offered several variations on those in later years to specifically address that sort of thing

It’s not clutch pack based, but is a cone-contact type and wouldn’t be my first choice for heavy duty, competition, or high power use. That’s why I own multiple OSG lsd diffs, but for street use with low to mid-ish power it seems like a cheap alternative if you can locate a low mileage one. I gave mine away for free, but that might be an exception. I recall that the last several LSDs I had installed ran around $300 each plus parts with me taking the diff in/out and dropping it all off at the drivetrain shop. Been a few years though.

So I looked around and couldn’t anything on here to support that other than it sounding more like forum lore and the most likely answer is to instead look at all the RX8s running turbos over the years. Because I’ve rarely heard of them either swapping out the stock one or having a failure/issue. That said, comparatively it’s likely a smaller pool of vehicles to judge from and they’re not all on the forum documenting their experience, I suppose you could know better about the situation than anyone else.

but honestly, compared to an OSG they all pretty much fall into that overall description imo, including a Torsen which I’d never specifically choose to use myself. Thirty years ago though, it was all the talk and now most people recognize there was some hype and forum lore going on then too. And let’s be honest, most people buy a diff/lsd new off the shelf or used and just toss it in rather than have it adjusted or tuned accordingly. Only the hard core competition crowd is likely to do that.

anyway, it’s the the same lsd in the FC T2, FD3, and RX8/SE3P so those are your options if you change your mind about swapping a whole diff or just the LSD.

Originally Posted by Oppai

Sounds similar to symptoms I have from my car from Japan which came with a cusco 1.5 diff with an absolutely absurd diff ramp. It'll lock up and make nice metallic THONK noises followed by tire chirping at 10-20 mph turns in the city.
The Japanese enjoy their drifting culture so they set these 1.5 way diffs with absurd diff ramps so that they'll lock up and break traction early while still being able to roll through parking lots and make U turns (tight streets in japan)
At least that's my working theory.
I was told by someone much more versed with building drivetrains than I that diff ramps can be changed fairly easily to be less aggressive and thus much less painful for street driving. I have yet to try this myself but you might consider it as an option.