7747 spark control questions.

[Bruce Plecan]

Just as a reminder,
When in limp home mode, your running bacically fixed timing, that 10 degrees
can mean alot.
Bruce






----- Original Message -----
From: "Programmer" <nwester at eidnet.org>
To: <gmecm at diy-efi.org>
Sent: Tuesday, October 17, 2000 4:54 PM
Subject: Re: 7747 spark control questions.


>
>
>
> >Does the bias not reflect what the distributor initial timing should be
set
> at?<<
>
> All the timing decals I've seen are "0" EST bypassed.
>
> >Why would you have a value like this unless it was just for something
like
> ALDL output?<<
>
> I don't recall even seeing a spark value on a scan tool for a 7747 truck
> app. Tech 1 maybe ?
>
> >> You could just add 10 degrees to the timing tables and set the
> distributor at 0.  No need for subtraction in the timing table<<
>
> Well---that's how I thought it was.
>
> What is the raw value for the 50kpa at 600rpm?
> >
> >Squash
> >
> >--- Programmer <nwester at eidnet.org> wrote:
> >> Ok, EST bypassed is non computer dizzy timing. You should then be at
TDC
> or
> >> 0 degrees as per the timing decal. If Bias warm is 10 deg. Bias
> >> cold is 20 deg (I think). Winbin table for 50 Kpa @ 600 rpm is 29.88
deg
> >> whereas
> >> Tunercat is 20.1 degrees BTDC. (Using an ARJT as an example).
> >> Winbin adds 10 deg or includes the bias--TC doesn't add it-- so what's
> the
> >> actual "engine" measured timing value at 50Kpa and 600 RPM ? I'm
assuming
> if
> >> the WOT table has a negative, it's adding 10 bias. So lets' say we have
a
> >> negative 3 at 100Kpa and 1000 rpm--we've got an actual 7 BTDC at that
> point
> >> provided we set the ignition timing as specified. If we add 9 degrees
to
> our
> >> base timing, we've then got a physically measured16 BTC at 100Kpa and
> 1000
> >> rpm. Is this not correct ??
> >>
> >> Lyndon.
> >>
> >> -----Original Message-----
> >> From: Shannen Durphey <shannen at grolen.com>
> >> To: gmecm at diy-efi.org <gmecm at diy-efi.org>
> >> Date: October 17, 2000 10:41 AM
> >> Subject: Re: 7747 spark control questions.
> >>
> >>
> >> >Depends on reference or initial timing value at 0x009.  If bias is at
> >> >10 Dizz base at 9, and static angle is 9, spark table is only 10 deg
> >> >biased.
> >> >Shannen
> >> >
> >> >Programmer wrote:
> >> >>
> >> >> You're at 9 BTC with the EST disconnected ? That adds another 10
with
> >> >> EST connected. You're going to be close to 35-40 BTC hot idle.
> >> >> Lyndon.
> >> >> -----Original Message-----
> >> >> From: Reid Bishop <rbish at ibm.net>
> >> >> To: gmecm at diy-efi.org <gmecm at diy-efi.org>
> >> >> Date: October 17, 2000 12:52 AM
> >> >> Subject: RE: 7747 spark control questions.
> >> >>
> >> >> >>>Dissies are set "0" with the EST disconnected. The bins should
show
> >> main
> >> >> >>>spark bias at 10 degrees.
> >> >> >
> >> >> >Really?  Hmmmm... my 4.3 dist is set to 9 BTC, and I my spark bias
is
> >> set
> >> >> to
> >> >> >10.  I could still use more advance throughout the curve, but not
> >> working
> >> >> >that yet.
> >> >> >
> >> >> >Are 4.3's the exception to this rule?
> >> >> >
> >> >>
> >>
>
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> >>
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