I don't think saying the car "goes into limp mode" is accurate. Limp mode to me means the engine rpms and power are dramatically reduced. This car just goes into FWD mode, right?
If you go to 12:20 min mark in the video, Jack initially didn't even know he had switched to FWD until he looked down at the gauge cluster. So, you still have a GRC with $25,000 worth of upgrades. I'm not surprised he was able to hold the lead for one lap. More laps,...?