Dyno results through an automatic can sometimes be misleading, especially with a higher stall converter. Some produce realistic results, some read super low.
That power may be dead on but we need more info because you’ve got a lot missing. Does the car feel strong to you? If you really want to know if it makes the power it should take it to the track and see what the trap speed is.
Why? The dyno is measuring power at the wheels, how it’s transmitted is irrelevant at that point.
I think the difference is, launching the car at the track as normal, you have max converter slip for a short time and it's coupled as close as it will be by the top of low gear.
Now take the same car and launch/make a pass in high gear. Would be a ton more slip/heat (resulting in less power to the tires) and to the same effect, would also show on a chassis dyno.
On cars with multi plate lockup converters, can often be a huge difference between locked and unlocked numbers.
Or, going from a less to more efficient converter with no other changes can result in much higher numbers with no other changes.
