Does anyone track their big turbo fiesta? I‘m planning on tracking it on the Nordschleife for several laps but I‘m concerned if it can take 20-30 minutes of punishment on stock internals @ 300 whp
If you're on the stock radiator and oil-to-water heat exchanger, chances are you'll overheat coolant in 2-3 minutes driving at a decent pace. If you've never driven on track, and/or you're new to the Nordschleife, you might not run into overheating issues right away.
At a minimum, I would run a performance oil such as
Motul 300V 0w20. It will give you far more protection than non-performance oils at high temperatures. Switching to distilled water + additives (e.g. Redline's Water Wetter or NanoCool in the US) instead of water/coolant mix will also give you a bit more cooling capacity.
If you plan on tracking often however, a larger radiator and a dedicated oil (to air) cooler are required to prevent a car with stock power from overheating after a lap or two. Big turbo will heat things up quicker.
Hood vents would be the next thing to improve on the Fiesta ST after radiator and oil cooler.