Diff question

by **lelkins** » February 24th, 2010, 4:51 pm

Hello,

Finally getting around to digging the Miata out last weekend (long story....). It was parked a little bit nose-down and had ice under the rear wheels. I noticed that as I was trying to back it over the layer of ice that the passenger side wheel was spinning and the driver's side wheel certainly didn't seem to be. Could it be a dead differential? (It's a 2000 LS). How can I test the diff to see if it's still working? And how much could this contribute to my not-so-hot autocross times for the last while?

-Les Elkins

by **prostwest** » February 24th, 2010, 4:54 pm

Torsens go fully open when one wheel is close to zero grip.

by **IH82BL8** » February 24th, 2010, 9:43 pm

That's normal behavior for an open-drive (non-limited slip) rear. It's my understanding that one of the limited-slip diffs (I forget which one) loses it limited-slip characteristics after about 70k miles and acts more like an open-drive.

by **moxnix** » February 24th, 2010, 9:53 pm

IH82BL8 wrote:That's normal behavior for an open-drive (non-limited slip) rear. It's my understanding that one of the limited-slip diffs (I forget which one) loses it limited-slip characteristics after about 70k miles and acts more like an open-drive.

Viscous - 90-93 miata.

by **lelkins** » February 26th, 2010, 8:50 am

Hello,

Thanks for the response, I didn't realize this diff had an 'ice mode'. And I knew that somewhere in Miata history was one that tended to wear out and stay open, nice to know mine isn't one of them....

Thanks,

-Les

by **prostwest** » February 26th, 2010, 9:23 am

lelkins wrote: I didn't realize this diff had an 'ice mode'.

I guess it's more of an Ice Blind spot, but yeah, I think that's how it works.

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