Obviously steady state will be different. But what counts is acceleration force over a given time. So the stepped test is what I think I was referring to.gmrocket wrote: ↑Mon Jul 06, 2020 6:51 pmMost acceleration tests are 300 or 600 rpm stepped testsBelgian1979 wrote: ↑Mon Jul 06, 2020 12:53 pmhm, a nascar engine might. Cannot see anything regular do this type of thing at say 7000 rpm for too long? The question is though if it is needed. As far as ignition timing is concerned (which would be the primary reason to tune on a dyno), most are at the maximum advance around 3000 rpm or so.Keith Morganstein wrote: ↑Mon Jul 06, 2020 11:47 am
The simplest is a step test where the engine is loaded to and stabilized at each RPM point. This is common with HD Diesel dyno testing.
True racing endurance engines will handle that type of testing.
Many hot rodded automotive engines wouldn’t last too long...
The steady state test will give a different number
Is that what your asking ?
Steady state is the most useful when tuning as you will want to hold the engine at a constant rpm while you vary the load. This means you have to have a computer that controls the load of the brake to keep the engine at it's set rpm to tune.