Some friends in town have a chassis dyno in their shop.
It’s a dyno jet. They’re on there 2nd one.
The first one was the intertia style that had the heavy large diameter rollers.

Probably around 15 years ago they had a 69 Charger on it.
Flat top 440, SD intake, Demon 850, ootb RPM heads, 1-7/8” headers, MP 509 cam, 10” converter, 3.91’s.
Ran fine, felt pretty hot driving it around.
Made around 285hp to the wheels. The guy was all upset.

Took it to the track and it went 11’s.

I’ve seen a lot of that kind of thing that really make me scratch my head.


The new Dyno Jet they have has smaller rollers and uses an eddy current type of absorber instead of inertia....... so you can actually load the motor prior to making a “pull”, along with being able to set the accel rate.

I haven’t seen that one in action yet.