Do Bigger Injectors Always Mean More Fuel?

[dan.1337]

I was wondering whether a bigger injector would automatically mean more fuel use if everything else is the same?

For instance, if i'm using a 550cc injector instead of a 440cc but making around 180rwkw, would i be automatically pouring more fuel into the engine just cos i have a bigger injector? Or would both injectors with the same setup be flowing the exact same amount of fuel for that power?

[Slim Mat]

http://www.skylinesaustralia.com/forums/t170167.html

Have a read there Dan. I was wondering about something similar.

[dan.1337]

Thanks for that link.

So it looks like it depends on the state of tune and what the ECU tune is telling the injectors to do...?

[Duncan]

yes...but to answer your original question, if you just replace the injectors and don't do anything else you will end up with more fuel, going from 440 to 550 would give you 25% more fuel. You need a retune at the same time it probably wont even idle with 25% extra fuel.

[RB30-POWER]

you can't just put in bigger injectors in or you will use more fuel and your car will run like crap.

you must retune the ecu maps and reduce the injector pulsewidth to maintain original air fuel ratios.

once you have corrected the fuel maps your fuel usage will not change at all.