7747 spark control questions.

[Programmer]

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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