Target Air Fuel ration N/A engines.?
#15
Registered
Here is my chart right from my ecm (as target AFR) KPA on the left and rpm across the bottom. Anything over 105kpa and I'm making boost. This is on a twin turbo GM ls but you can atleast see where I'm sitting before boost comes on.
I usally like to have idle around 13.5-14 this motor loved 13.5. at 14 it would want to "hunt"
Should add spent many late nights running it in each area shutting it off and check plugs. I just pulled the heads off (to add studs) and no sign of detonation with these afr. I was a little worried about my cruise (3000rpm) afr but once I got knock sensor dialed in I still had plenty of timing left before it started binging.
I usally like to have idle around 13.5-14 this motor loved 13.5. at 14 it would want to "hunt"
Should add spent many late nights running it in each area shutting it off and check plugs. I just pulled the heads off (to add studs) and no sign of detonation with these afr. I was a little worried about my cruise (3000rpm) afr but once I got knock sensor dialed in I still had plenty of timing left before it started binging.
#16
Geronimo36
Gold Member
Ok, My gut tells me a good target Air fuel in the boat is 12-12.4:1, is that what you guys shoot for? I dynode and had engines at low 12's, in boat I see low 11's and sometimes 10.8 for a short burst, I am going to re jet for low 12's "in boat" I have widebands so I can keep eye on it all the time, is that the best target A/F?
#19
Registered