AFR change after street port rebuild
#1
Junior Member
Thread Starter
AFR change after street port rebuild
Hey guys! I picked up my first rx7 not too long ago with blown coolant seals. After I rebuilt the motor I noticed a pretty drastic change in cruising AFRs, I was wondering if that's normal or maybe I missed something.
I did a mid-range Pineapple street-port while I had it apart. It went from cruising highway speeds around a 14 AFR, to cruising around a 12 AFR. Boost is pretty similar, although turned way down.
I would have imagined the ECU would compensate for the increased airflow and run about the same, but if anything, the increased airflow would lean it out a little, not richen it up?
Could a missed vacuum leak cause it to richen up that much, or do vacuum leaks even change it much since it's MAP based?
Any other thoughts on what could cause the change?
I will be getting a new dyno tune hopefully within the next couple of weeks, but if there is a problem causing the change, I would like to address it first.
Thanks guys!
I did a mid-range Pineapple street-port while I had it apart. It went from cruising highway speeds around a 14 AFR, to cruising around a 12 AFR. Boost is pretty similar, although turned way down.
I would have imagined the ECU would compensate for the increased airflow and run about the same, but if anything, the increased airflow would lean it out a little, not richen it up?
Could a missed vacuum leak cause it to richen up that much, or do vacuum leaks even change it much since it's MAP based?
Any other thoughts on what could cause the change?
I will be getting a new dyno tune hopefully within the next couple of weeks, but if there is a problem causing the change, I would like to address it first.
Thanks guys!
#5
Junior Member
Thread Starter
Ok yeah that's kinda what I was hoping the reason would be. I know the VE would be changed up a decent bit, just surprised it made such a big impact while cruising and idling.
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