7747 spark control questions.

[Squash]

Does the bias not reflect what the distributor initial timing should be set at?  Why would you
have a value like this unless it was just for something like ALDL output?  You could just add 10
degrees to the timing tables and set the distributor at 0.  No need for subtraction in the timing
table...

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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