ECU Flash-Rescaling for new injectors

[oregon123]

This seems like an easy task..but I dont want to mess it up.
2002 WRX.

I have a new set of injectors to install (600cc), I have flow reports on them. I have flow reports on the injectors currently in the car(900cc). So I am changing to a smaller flow-rate injector (to try to improve idle, 900 are way to big for the engine).

In the ECU flash software, when I open my ROM, under the injector category, and the injector scaling field it says 649.94

What should I change this value to when I drop in the new 600cc injectors? and is that all I have to do? anything else need changing? thank you very much in advance.

[KanScooby]

Hi, I could be wrong here, but that scaling seems to be on the lower side for 900cc injectors. How was your Fuel correction and learning at idle with those settings?

[oregon123]

fuel trims are high at idle, up to +15-20%. We have been attributing it to poor atomization coming out of these injectors.

But, I am just going to take it to a shop that is experienced with this, i dont want to mess anything up.