Pull ABS fuse or disconnect a wheel rate sensor. Both will do it. (all the usual disclaimers for other people reading this...)
I remember running the West track a little over a year ago now... here it is in my journal
TravisJB Journal
I did in fact have a couple major ice mode issues there now that I think back to it... coming out of the carousel approaching the turn before start/finish... car locked up a couple times... can't remember which pads I was running probably on page 40-45 somewhere, or maybe a bit later, sorry
I remember thinking this was not a temp issue, but a wheel hop and differential spin rate issue, which is driven by suspension tuning and of course overly conservative abs algorithms
some vid here as well
TravisJB Track Video