Correct A:F Ratio @ WOT?

[Matt Beaubien]

Bruce,

> So what do you offer?.
> Tuning for less then best, will generate excess heat, and carbon flakes.

Optimum power on a highly turbocharged engine will be near 12.5:1 AFR.  To
maintain this for any length of time on pump fuel would require retarding
the spark a bunch to fight preigntion/detonation, which would raise exhaust
temps.  These high exhuast temps will then proceed to tulip exhaust valves,
crack manifolds, and wreck turbos.  The solution?  Run more fuel and more
timing (obviously without detonation).  The engine won't make as much power,
but I'd rather deal with a bit of carbon build-up vs melted pistons.

Matt.


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