Searching the net, I am unable to find any valid jet dragster numbers.
The major sanctioning bodies do not actually sanction the jets anymore,
just as they don't have rocket, compressed air, or electric car classes
or ones for four wheel drive vehicles. (The electric guys have NEDRA).
Since these are exhibition vhicles the ET and trap speeds may be
accurate, but they are not recorded by the sanctioning bodies.

What is obvious from a Web search is that most of these jet dragsters
and funny cars are essentially hobby efforts and are running first and
second generation jet engines long out of aircraft service. Obviously,
legit competition and funds with more modern engines would drive speeds
radically higher. I think Arfons was quoted as running in the low fives
or high fours in the mid/late 60's.