I rode Thriller/texas Tornado several hundred times while it was touring germany. I had the "pleasure" of riding it in its first season 1986. This was when the cars had NO OTSR. I stumbled away from the ride feeling like ive just been tested for NASA. Since then the ride had to surpass numerous changes to make it a safe ride. In its first weeks of operation it caused many cases of whiplash and spinal injuries.
Since then the coaster was tamed but it still was a savage, incredible ride. Especially the first drop and the two loops are mindblowing. The ride was really supposed to pull 5.6 gs for a fracture of a second. But to make my point: I never had a single moment on this coaster when i came close to tunnelvision or blackout. Ive ridden this baby in heavy rain and sunshine (rain just gives the ride an extra kick to complete insanity, since the blockbrakes dont catch at all!)
Alledgedly a former Schwarzkopf creation THE TRIPLE LOOP (now being found in the UK) pulled about 6.2 gs. The secret here were two insane drops before the first two loops (the loops were average sized Schwarzkopf loops, thats why the weight of the train pushed the front car with ridiculous momentum into the first inversion. No OTSR on this ride!)Ah, those were the lucky days of pre-CAD