AFR Table where to start?

boost junkie · Post by **boost junkie** » Mon Dec 26, 2005 6:04 am

Professor, I'd go richer in boost. @ 170kpa 13:1 air/fuel is dangerous. Above 100kpa dip it into the 12:1 range real quick...

Post by **efahl** » Mon Dec 26, 2005 7:33 am

boost junkie wrote:Professor, I'd go richer in boost. @ 170kpa 13:1 air/fuel is dangerous.

Oh yeah, I'd say more like 10.5-11:1 for the high boost sections of the map until you have some experience with the motor and have the ignition dialed in fairly well. This will kill power, but shouldn't kill your motor.

Eric

Mad Professor · Post by **Mad Professor** » Mon Dec 26, 2005 9:16 am

Something more like this?

Post by **efahl** » Mon Dec 26, 2005 10:15 am

If you have a catalytic converter, everything below about 90 kPa should be 14.7. If not, then lean it out a whole bunch and save some fuel. Go as lean as you can before you get lean misfires, usually 16.5-17:1 with most ignition systems.

Eric

ChaosAD · Post by **ChaosAD** » Mon Dec 26, 2005 1:34 pm

Should the AFR below 90kPa change with revs too? or just be the same throughout the rev range?

keithmac · Post by **keithmac** » Thu Dec 29, 2005 1:28 pm

Is this for closed loop mixture control? if your O2 sensor goes bad on boost you may destroy your engine.. I manually mapped the boost section on my MS1 but MS2 may work differently?