Correct A:F Ratio @ WOT?

[Brian L Massey]

Is this at all quantifiable? An example would be good if you have even
one you can give.

I'm not looking for a magic number or formula, just a rough "order of
amounts". For example, if the peak power ignoring damages is near 12.5:1,
but practical use of turbo actually ends up around 10:1-11:1 (lets say
just for discussion), that is 1-2 AFRs lower than peak. Any idea how much
this safety margin enrichment "costs" in terms of HP? What I'm wondering
is just how steep the curve is in this relationship. Tnx.

Also interesting how stoich is about the same AFR distance from peak, as
peak is from practical.

Brian

On Sat, 29 Sep 2001 13:06:47 -0400 "Matt Beaubien" <mrbeau0 at yahoo.com>
writes:

> 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.
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