Metro-Gnome and Molly Maid Miata going full tilt!

No, not a small child.  Helmet mounted camera.

God I feel for your transmission... good driving though...

THe camera is called the ContourHD.  Find it here www.vholdr.com.  Nifty item.  Very light and easy to use.

Diff pins.  Sadly, the least of our worries at this point...

After looking at your guys' suspension, I'm guessing that inside wheelspin is at least partially due to your travel-limiting cut springs and that clever little tab you have holding them to the spring perch so they don't fall out at full droop. I'm guessing you aren't getting full extension on the inside front tire.

The inside wheel seems to be lifting off the ground, and setting you into a lift/spin/hop cycle that beats the shit out of not only the diff pins and chains, but also, perhaps, your third gear.

I've driven quite a few track cars with adjustable preload that were set up by people who didn't really understand why that adjustment was there. The cars ended up with insufficient droop travel and then any kind of mid-corner input (bump, curb, etc) would set up a nasty bounce much like yours.

Try making a spacer under the spring that can hold it in place at full droop. You'll raise the front of the car a bit, but there will be a balance point somewhere where you can get a contained spring, full droop, the ride height you want, and a high spring rate.

This is how we did it:

-Dave

it does appear that power on wheelspin is hurting you in the corners...but I think this was the FWD metronome...the new one shouldn't have this problem.....also in the beginning you sure caught the miata pretty well down the straight and on the brakes...but man did that miata have "turbo torque" to pull you out of the corner...damm