Helmets are required even for the Grand touring class aka TSD. We will be running in the unlimited class with a full rally computer.
Here’s a youtube playlist from a car that ran the 2014 Targa Newfoundland. They ran in one of the ‘targa’ classes, so they’re basically going as fast as they can.
We’ll be in the Grand Touring class, where there’s a both a set ‘average’ speed per-stage, and a fixed ‘not-to-exceed-ever’ limit of 130kph (81mph).