Originally Posted by JeremyAnderson
At high load and 14.7, you will hole a piston, lift a ring land or pop a head gasket! Most ECUs stop takeing input from the O2 sensors at around 75% throttle and stop trying to acheive 14.7 way before that. At WOT on a N/A engine , best (and safe) power is acheived at around 13.5-13.7. On a forced induction engine it is around 12.5-12.7. The reason these things run so darn rich is becuase rich is safe.
As far as showing a rich condition on the dyno because "You just stuffed a ton of gas in the cylinders" is kinda true. The first 1-2 hundred RPM of the pull will show a slightly over-rich condition from the ECU's " accelerator pump" just trying to get the engine going. After that, it is just the fuel map.
I'm not a Bosch engineer, but I am a race engine builder by trade. After 14 years it is the only career I've everknown, so I know it pretty well (but learn new things everyday). An engine is an engine, no matter what manufacturer is on the valve covers. Engine managment systems (ecu) will need to keep the fueling in certain parameters or bad thing will happen.
-Jeremy
This is basically what the dyno-operator told me. He said at 14.7, the engine would self-destruct (supercharged). He said an N/A engine would be OK...but boosted would blow, if I remember correctly.
I'm not very knowledgeable in A/F and its effects. I know lean is bad, but fast...too lean is fatal.
He did say my A/F was right where it needed to be.
Interesting discussion regardless.
HDDP, how much of your research has been on the SRT engine you have now, vs. the N/A stocker you had?
SQ