tech gets involved in lots of things. some of them are even technical...
pro events differ from club events in some significant ways. one of them is that in club racing, we rarely get to see the inside of anything; everything in club is on a budget. the regions only have so much money and the racers only have so much money, so taking someone's motor or transmission apart isn't something that's done casually. pro is different, the racers are presumed to be able to afford it, so they occasionally get to take their stuff apart and show the insides to tech.
one of the things that scca pro does with world challenge is seal stuff. typically a number of aspects of the motor are sealed -- the cam covers, the oil pan, and the restrictor plate (if there is one.) for cars that have "rewards weights", those get sealed as well (rewards weight in WC is the weight that gets added every time a car places well in a WC race. GT cars usually have weight, Touring category cars are less likely too.)
how do seals work? there are two kinds. there are wire seals, which generally loop through holes drilled in the heads of bolts (two of them, carefully chosen), and there are the newer electronic seals, which cap the head of a well chosen bolt and must be destroyed to be removed. both types of seals have numbers, the wire seals on a plastic tag, and the electronic seals in the form of an RFID tag which is read with a battery powered, hand held reader.
so motors get sealed. why? so that tech knows that they're seeing the same, unchanged motor from event to event. restrictor plates get sealed after being measured, and rewards weight gets sealed after being weighed (of course.)
so between practice sessions, we spend some time wandering around the paddock in search of cars that are known to need to have seals applied and doing inspections on newly presented cars (which will need seals too). after qualifying and the race, one of the things that gets done is checking seal numbers against the seal database.
there are some other technical issues besides seals i'll cover in another post -- the bundle of things that happen post qualifying and post race, and the tire rules.