Exactly as Tom stated. It would have to be a back to back dyno comparison and include all the tuning required for switching the LIMs. (i.e lots of dyno $$$)
In other words it will never happen unless someone wants to spend a sizeable chunk of money just for the test. It would take a while to PROPERLY tune for no secondaries. It would require multiple datalogging runs just to work out the spark curve alone.
It is not something you can do quickly and truthfully not something you can fully do on a dyno at all. (way too much regular drivability tuning required!)
