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Old 08-14-2009, 03:28 PM   #1
LtNoogie
 
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Technical question about bigger injectors

This question is fuel economy related but I wasn't sure if the people in the FE forum were very technical.

If you swap out the stock injectors for bigger ones AND during normal driving you stay in closed loop mode... i.e. wideband air/fuel mixture is normal at 14.7... are you getting the same gas milage as if you had stock injectors?

My guess is yes. If the ECU is able to maintain an AFR of 14.7, it is metering back the gasoline to the same flow as the stock injectors.

The reason I ask is whether one can trust their data logger or ScanGauge so long as the AFR stays at 14.7. No boosted driving is involved during this gas milage run.
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Old 08-14-2009, 03:34 PM   #2
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yes it's ALMOST the same. If the air/fuel ratio is the same and the amount of air is the same, then the fuel used is the same.

However, as injectors get bigger (for the same purpose) the resolution goes down. My 632cc injectors are at a VERY low duty cycle when not in boost, so I am using up some extra gas because of that.
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