Use Pro-calc to run your fuel injection jetting prior to a flow bench test, dynamometer test, or race outing. To determine a ball park of the nozzles & jetting needed for a test or outing. How many test sessions are compomised by a shorage of proper nozzles or jets available for the test. Testing is time consuming, involves a lot of people, and expensive. Pro-calc can be used for planning the range of nozzle & jetting sizes to best suit the test.