[Diy_efi] RE: Diy_efi digest, Vol 1 #413 - 12 msgs

[bill.shurvinton at nokia.com]

Having slept on it I think I may not have described things very well =
here.

The dyno can set a constant load of 8HP (once you have taken frictional =
loss differences due to 2 contact patches etc into account). However at =
what throttle setting you should have 8 HP? Given you have the curve of =
BSFC vs Power depending on the engine there are a range of throttle =
openings corresponding to the same 'load'. Tuning the whole map on a =
dyno for best power or best BSFC is obvious, but the blend between those =
would appear, at least to my inexperienced eyes, to be a challenge.

Bill

-----Original Message-----
From: ext Adam Wade [mailto:espresso_doppio at yahoo.com]
> The Dyno of course has difficulty replicating this.

Actually, it has been my experience that brake dynos
can duplicate it quite well when steady-state (load =3D
power produced).  By only loading the engine for the
equivalent of, say, 8 horsepower, you can duplicate
cruise conditions fairly well, and map
higher-rpm/small throttle opening sites steady-state,
just as if you were cruising down the road at a set
speed with no wind.



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