Injector Balance Calculator
Liguori Drag Racing • Fuel Systems
Injector Balance Calculator
Enter each injector’s flow-test reading to see how evenly your set flows.
Use the same test fluid, pressure, duration and injector settings for every reading. Compare one test condition at a time.
Example readings only. Replace these with your own test results.
Your injector balance
A negative difference means less flow than the set average. A positive difference means more flow. These results compare flow only; they do not diagnose an injector or prescribe an ECU trim.
How the percentages are calculated
Average = sum of readings ÷ number of injectors. Each injector’s difference = (reading − average) ÷ average × 100%. Overall spread = (highest reading − lowest reading) ÷ average × 100%.
The calculator accepts zero flow so a non-flowing injector remains visible in the comparison. At least one reading must be greater than zero. There is no universal pass/fail limit; compare your results with your injector supplier’s test specification.