[Diy_efi] :dynos and tuning

[William Shurvinton]

OK I think we are getting to the crux of our differing opinions.

If you are on a dyno you (i think) crack the throttle a bit say 10% at RPMX
and tune spark and fuel for the max power you can get at that opening.
However at low throttle openings many engines are very tolerant of huge
variations in AFR, so you 'MIGHT' want to tune the 8HP point for 15%
throttle. This way you get reduced pumping losses therefore better gas
mileage and possibly more drivability. This is a 'street' thing as race
drivers want power and throttle response.

Bill
----- Original Message -----
From: "Adam Wade" <espresso_doppio at yahoo.com>
To: <diy_efi at diy-efi.org>
Sent: Thursday, December 19, 2002 8:13 PM
Subject: RE: [Diy_efi] RE: Diy_efi digest, Vol 1 #413 - 12 msgs


> --- bill.shurvinton at nokia.com wrote:
>
<snip>
> > 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.
>
> If you were so inclined, it seems to be simple enough
> to average the fuel numbers on your map.  I'm not sure
> what goial would be achieved by picking a particular
> value between the two.



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