Re: 7747 spark control questions.

["Programmer" <nwester@eidnet.org>]

>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@600rpm?
>
>Squash
>
>--- Programmer <nwester@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@grolen.com>
>> To: gmecm@diy-efi.org <gmecm@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@ibm.net>
>> >> To: gmecm@diy-efi.org <gmecm@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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