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Ok i have a power fc, i used paulr33 excellent faq and i know how i need to correct for the larger injectors i have (1000cc) but do i need a retune one i install them or no ? i am changing NOTHING AT ALL but the injectors, no more boostr nothing, i do have a larger turbo i will be installing, but right now i just need car moving any advice ? and of course once i install the larger turbo i will be getting it tuned !

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Hook up a wideband O2 and just keep an eye on the A/F, I find with larger injectors from factory it just richens heaps on full load.

but if you're driving the car under 4000rpm you should be fine provided it's not stupidly lean

just imagine the injectors are physically bigger. they work off the same voltage as your old ones so all that changes is pulse timing and width. so if you have gone from say 500s to 1000s, at the exact same tune state they will literally run twice as rich.

the most common mistake i see with injectors is people thinking that they could just put a bigger set and not need to do anything else, that and adding an FPR can fix anything.

its all a learning experience, your doing well mate :P just spend some time retuning em and it will all add to your experience.

Since you will have setup the PFC to cope with the new injectors, the tune should be fine for driving between workshops (no boosting). If cold start/cold running is not ok then something is amiss (for example you didnt enter the correct latency when updating the PFC)

You may even find its ok without a retune, but you need to verify that on the dyno first.

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