Re: 7747 spark control questions.

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

Absolutely !!
Lyndon
-----Original Message-----
From: Bruce Plecan <nacelp@bright.net>
To: gmecm@diy-efi.org <gmecm@diy-efi.org>
Date: October 17, 2000 3:53 PM
Subject: Re: 7747 spark control questions.


>
>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@eidnet.org>
>To: <gmecm@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@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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