Pull the track fuse, and then reset the ECU by pulling the ECU fuse and then puting it back in, start the car and have them get the car up to 80mph on the dyno. At 80mph have them start the dyno run. If you try to dyno an auto below 80mph the car will down shift to second and mess up the readings. You will probably only get 2 to 3 runs in before your intercooler will get to hot and hurt your readings then you will need to let it cool down.
Ice is only good to help cool the motor sooner.