Leaderboard

Im still not keeping up -lol Now tuning on a Protunerz intake . Not much different than the last intake but the longer runners help the low end . Something I’ve noticed with ALL these plenum intakes is that the air is not always equal across the cylinders . I am probably one of the very few that has a 6-2 header that continue on to duals AND have a Wideband on each side of the exhaust . The tendacy of these plenums that under high vacuum situations ( idle or lower KPA) , the first 3 cylinders indicate that they run leaner - as if they are stealing the air out of the room . As soon as KPA gets above idle the AFR’s start to even up quickly . Not sure if you could detect this on the plugs unless you ran your engine very lean . The Megasquirt 3X allows for injector trim which I have been adjusting . To get AFR’s to match up between the two banks I add as much as 20% to high vacuum cell areas . It also can be felt by a smoother engine operation . Now this is mostly over- run conditions and light throttle modulation during highway cruise . I’ve checked calibration on my Spartan 14.7 wideband and they seem correct . I have my ego sensors separated by banks . I guess I also wonder why tuner analyze won’t pull in more fuel in these situations , I use the same AFR table for both ego sensors . Just thought this was interesting and most won’t see this with their 6-1 header where it all averages out