13.2 to 13.4 AFR change , stock car swings the AFR more than this when it is on closed loop.Thats as we are swinging the inlet cam agressively that causes the bhp blip. Remember this is a full throttle pull you dont normally run full throttle from this low RPM when driving on the road
No worries re your idea,s re the AFR,s but I am 100% happy with the AFR.
To be honest if you had rods and pistons fitted i would run the car far leaner than I am at the moment
stock pistons are made of chocolate , any detonation and your break a ring land simple as that.
I think you need to see some of the Utec mapped cars I think you see some big AFR swings.
I am in the US at the moment tuning the Project Z VQ motor on Performance Motorsport dyno, try to get a vid and get in posted up