Well, if we're comparing top class to top class, then the Core Nissan DPI is still over .5 of a second slower than the old Audi R10 was. I do suspect that with some development that a DPI will be faster around Mosport in a year, two at the very extreme most.
It's just like comparing GTE/GTLM to GT1 They're basically as fast as GT1 cars now. And with their aero packages, they're only 1100kg minimum weight, 600-650bhp and carbon brakes away from doing what a GT1 could do now.
Big reason for this, of course, is tires. GTLMs also have less rubber on the road than the GT1s did, same with LMP1 vs DPI. But that's been erased by what Michelin have done.
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