Quote:
Originally Posted by jpd80
A lot of that is being achieved with 14.7: mixture strength to keep the engine efficient,
that and the derating ~30 HP/30 lb ft that applies to Super Duty ratings.
The same engine in F150 with no tune change suddenly becomes 460 HP /505 lb ft.
Those big 4.22" bores and the guy who did the Coyote heads also did these wedge heads.
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That's the key, the engine is almost making peak torque while operating in stoich
AFR. Most other engines would drop into open loop mode and
AFR's drop into low 12's to high 11's (or richer depending on TPS) in order to develop peak torque, and have the fuel consumption penalty.