Thread: E46 LSD options
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Old 04-01-2017, 02:31 PM   #4
Nick M3
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Join Date: Oct 2003
Location: Bethesda, MD
Posts: 12,438
I have two diffsonline units. One of them I bought used, and it slightly whines (it may have had the input flange swapped, which can cause pinion whine if it's done wrong). The one I bought new is in the race car and it's been great.

We just installed a (used) wavetrac unit in Mike's E90, but haven't driven it yet. It does spin both wheels in the same direction on the lift, but I can't speak to how it behaves in reality.

OS Giken has been incredibly unreliable in E46 applications. Failure after failure after failure is what I hear. I would not consider it.

The upshot of helical is that it gives you a basically completely clean steering response. Clutched diffs will be a lot more likely to impact steering in some way. Helical diffs also basically don't wear out, which has some virtues.

Personally, I really like the way that the 30/90 diffsonline units drive. On a street car, this is less of a factor though. I wouldn't have done the E36 diff if it hadn't been fairly cheap.
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