There has been a bunch more info posted at the other thread (on 500E.com, linked in an earlier post) that's interesting. Gerry in Portland says his 500, in mostly stock form, can roast any street tires with ease (cold OR hot) and he has video of it at the strip doing so (video links posted in the other thread). But Glen's 500 acts like mine, it will spin his 275/35/18's when cold, but barely if at all when warm. Hmmm.... very odd. The question of tire traction improving when the tires are warm was brought up, but Gerry's data kind of poo-poo'd that theory. (?)

Thanks to all for the ideas/suggestions, please keep 'em coming...!