To test the limits of the 765LT requires taking it to a place where you're unconstrained by pesky things like, say, speed limits and oncoming traffic. (To be fair, that's really the case with any McLaren — or other modern supercar — but it goes double for the 765LT.) So, I took it northward from New York City to the top-left corner of Connecticut, where historic Lime Rock Park lies.
Sadly, historic Lime Rock Park's 1.9-mile track was filled with historic race cars the day I went, and while they said they'd be happy to let me on the course with them, the prospect of accidentally demolishing a vintage car and its driver with the weapons-grade Macca felt like too big a chance to take. (Also, I forgot my helmet.) Luckily, however, the kind folks at FCP Euro were more than happy to give me exclusive access to their recently acquired autocross course that fills much of Lime Rock's infield.
Autocross, in a way, is a particularly trying test for a car like the 765LT, because it largely neutralizes the supercar's power advantage, instead forcing more attention on the handling and balance. I ran most of the course in second gear, occasionally short-shifting into third just to see how the engine behaved at lower revs.
The 765LT probably would have rather been on a bigger track, but it proved a well-balanced delight on the autocross, with an immediacy of turn-in and reaction that was just as delightful at parking-lot-fun speeds as it was on the occasional high-speed on-ramp blasts I managed to sneak in. Like the 720S, this Macca boasts the Proactive Chassis Control II Suspension that does without traditional anti-roll bars, instead using interlinked hydraulics to keep the car preternaturally level and balanced even when being hustled. And while the idea of a sports car at this level going without a limited-slip differential seems baffling in principle, McLaren's brake-based open differential alternative — which slows the inside wheel with the brake caliper instead of speeding up the outside wheel via LSD — works damn well in principle. Bottom line, not only is the 765LT quick — it's fun.