[Diy_efi] Tuning on Dynapack

[Joe Lutz]

The way I generally treat the timing if your not getting any knock is 
advance while holding a constant speed and Throttle position until the 
torque levels off at max, then retard 5 degrees.  Generally you will see 
knock first though, especially if you are in at high loads.  Another thing a 
lot of people don't realize is that you need to run much lower timing at 
idle to prevent idle surge and stall upon sudden throttle lift.  If you have 
a hard time making it idle good, retard the timing at idle speed and load 
and let the IAC valve open up to make it idle.  I agree..fuel first, timing 
second.

Joe

From: Adam Wade <espresso_doppio at yahoo.com>
>Reply-To: List for general do-it-yourself EFI talk <diy_efi at diy-efi.org>
>To: List for general do-it-yourself EFI talk <diy_efi at diy-efi.org>
>Subject: Re: [Diy_efi] Tuning on Dynapack
>Date: Sun, 29 Jun 2003 20:48:57 -0700 (PDT)
>
>--- "Todd A. Pepmeier" <tpepmeie at yahoo.com> wrote:
>
> > Appreciate any guidance, especially if you've used a
> > Dynapack before.
>
>I've done this with motorcycles, but not with cars, on
>an eddy current dyno.
>
>I've been fortunate to have the time to do the whole
>map, so I'm not sure what to recommend in terms of map
>interpolation.  You might check with someone who's
>mapped the same engine to see where major "deviations"
>might be.
>
>My best advice would be to use a four-gas analyzer if
>you can, as that will tell you what you need to
>change, and often by how much, and can save you a lot
>of time and trial-and-error.  It can also show you (if
>you can read it well enough) what the likely source of
>a given issue is (cam timing, intake resonance,
>fueling, spark timing, and so on).
>
>I'd do the fuel first, as my experience has been that
>unless the timing is way out, you generally don't need
>to change fueling much (or at all) when fine-tuning
>spark timing.
>
>=====
>| Adam Wade                       1990 Kwak Zephyr 550 (Daphne) |
>| "It was like an emergency ward after a great catastrophe; it  |
>|   didn't matter what race or class the victims belonged to.   |
>|  They were all given the same miracle drug, which was coffee. |
>|   The catastrophe in this case, of course, was that the sun   |
>|     had come up again."                    -Kurt Vonnegut     |
>
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