Ordered thin fiberglass sheet, foam, epoxy and flox. Building the foam form is the fun part; getting it ready for paint so that it doesn’t look like crap is where all the time (and complaining) comes in.
A few people have asked why an air-to-water intercooler isn’t used instead of ducting. First, what it is: an air-to-water intercooler setup consists of a water-enclosed intercooler, reservoir, pump, hoses, and a front-mounted radiator. Heat absorbed by the water is pumped to the front of the car where it’s dissipated by a separate radiator.
So why aren’t I using one? For the street or drag racing it works fine because the engine isn’t under boost very long. At a trackday or hill-climb however, it can be challenged to shed heat faster than it’s generated, resulting in high water temperature – heat-soak – and then there’s how to get rid of all that heat once it’s in the system. Other negatives include increased complexity, cost, weight, reduces cooling of the regular radiator, and adds the potential for more leaks. While the air ducting is a project, it’s far simpler in the long run and can be run at speed for an unlimited time.
In unrelated news I ordered two new windscreens, a replacement and a spare. Several years ago I was on a group drive on mountain roads where it had rained the night before. The car in front kicked up a lot of sand and left my windscreen slightly sand-blasted. Every time I drive the car it bugs me, so that’s another thing on the to-do list. Lastly, the polyurethane showed up and the rear mount changed once again. Haven’t driven it but it’ll be better than the Delrin version.
Here’s the record-breaking run of the 1000 hp Nissan GTR at the 2016 Virginia City Hill Climb: https://www.youtube.com/watch?v=L9YMuQWVLL8