Over sizing injectors

[Mr2Mike]

The problem is that opening/closing time is not 100% constant, so as soon as your injector period becomes small enough to make opening/closing a significant time, metering accuracy will suffer. On a competition engine this isn't likely to cause problems other than a rough idle, but it could make road car unpleasant to live with.

[900T-R]

Mr2Mike said:

The problem is that opening/closing time is not 100% constant, so as soon as your injector period becomes small enough to make opening/closing a significant time, metering accuracy will suffer.

Exactly. The older/higher mileage the injectors, the more likely this will become a problem.