[obehave]

Quote: Originally Posted by NearlyNN

Hi all. It's my car and true it does see a lot of track time. Worth considering. Wish I had exhaust gas temp readings sure would have helped with causation. I would guess they are pretty high, what with the head, cam, manifold and throttle body work I have had done. Other Minis may not experience the same temps.

I've tested my A/F and running about 11.5, which is good. Track sessions are usually no more than 25 minutes tops. Some tracks I will run farther up the rev band. Now as to loads you may have struck on the real cause of the problem, my 225 pounds of lard butt.

I know you also mean track loads. My home course, Pacific, does have some altitude change, but the other local tracks are pretty flat.

Minimc, what I'm really curious about is whether the damage to the cat was gradual or happened in one fell swoop. No way to know now. Would be interesting if one could inspect one after 3 - 5 trackdays. However, that's darn near impossible. Just curious though.

Wouldn't be hard if you had that removable cat section hint hint wink wink