hey guys im just looking for some advise.
what afr should i be aiming for at idle,and crusing load.
i know at idle the engine is not under load so a leaner afr is ok . but how lean should it be .
my set up:
b18b block
manley rods
je pistons
gsr head
ferrea valvetrain
skunk 2 pro 3s
oem ignition
hondata s300 v2
and using a aem eugo gauge(i know its not the best and most accurate but its what i have).

 

what kind of fuel?

 

c16.

 

im just wondering, arent pro3's kinda big even for a 67mm...

at idle id go as lean as you can before it stumbles and misfires. id say it has to do with injector size and those cams. im sure your timing is up at idle already.....

elsewhere in the map not under high load i dont see a reason to try and tune it way lean, im sure nothing wrong with high 14's to mid 15's. i have my c12 tune with some street miles on it and i think its just like half a point or so leaner than my 93 pump tune with a few degrees more timing. at wot i was able to run about 6 degrees more timing in boost.

im sure some one with more experience will jump in here and do a better job than i did with advice lol

 

on c16, I'd aim for 15.2-15.4 at idle and adjust the injector phasing some (depending on your cam specs/adjustment) to richen it up .1-.2 . At cruise I'd do as blackeg said, and lean it out some to mid (even high) 15's, then use the timing to control any hesitation/bucking.
On some of the cars I tune on e85, I run well into the 16's for cruise