Quote:
Originally Posted by some_other_dave
You do have to be careful about matching the flow rates of the injectors, or you will throw off your mixture at some load/RPM condition. I know people in the Honda world love to upgrade their injectors to very high flow rate ones, and then they wonder why their fuel economy goes into the toilet.
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Yes, its very important to find the flow rate of your stock injectors and match with the new injectors. On old BMWs using Motronic 1.3-1.7, people have gotten away with everything up to 20% bigger over stock and still maintain 14.7 closed loop AFR. Open loop is another story and you should make sure you have the extra airflow to match. I went from 19# EV1 to 22# EV6 injectors along with intake modifications and picked up 15WHP about 1.5mpg averaged over many tanks.