AFR/FAR in Jeep Trackhawk

[HanJ]

Hi,

I read already several posts about the AFR not being 14.7 for normal pump fuel etc. But is still not clear to me what is actually used in the SW. I find stoich being 13.85 and all tables are close to that. That would mean that the engine runs rich on pump fuel but is does not. When measuring the exhaust gasses with a AFR 14.7 calibrated sensor at the dealer, result was that lambda was exactly 1, meaning idle runs perfect at 14,7 and not 13.8isch like found in the tables. Can someone put some light on this how it is actually done. The performance pages also indicate 13.6 or lower. It is still confusing and not matching the numbers in the table.

thanks

[fixit]

hellcat's are the same
if you search around the theory is because most gas is 10 ethanol, hence 13.8