Spark Bias??

[TK]

D014 is Bias for Main Spark. KMNBIAS N=E * 256/90.

This value allows the main spark advance table to produce negative (retard)
correction values for spark advance, as a function of the lookup table input
parameters. The correction factors produced by the tables are given by:
Correction = Table Value - Bias.


D015 Is Bias for Base Coolant Advance Correctoin KCTBIAS N=E*256/90

This bias value allows the corresponding lookup table to product negative
(retard) correction values for spark advance, as a function of the lookup
table input parameters. The correction factors produced by the table are
given by:
Correction = Table Value - Bias.

Therefore, D014 is a offset for the Main spark table and D015 is an offset
for the Base Coolant Advance correction. Taken together. the total spark
advance would be:

(Main Spark - D015) + (Base Coolant SA Correction - D015)

Other factors are likely added to these values.

In the end, D014 is not "warm bias". It is a bias of the main table. Only
D015 is a temperature related bias.

Terry Kelley

-----Original Message-----
From: Jason Weir <jweir at worldnet.att.net>
To: GM EFI Discussion List <gmecm at efi332.eng.ohio-state.edu>
Date: Thursday, June 17, 1999 6:34 PM
Subject: Spark Bias??


>Quick question, what exactly do the warm (loc 0x14) and cold (loc 0x15)
>spark bias values do??  The 7747 bin I am working on has the cold value
>at 20 degrees and the warm value at 10 degrees... Is there a simple way
>to explain what these things do.  I betcha Bruce would know....
>
>Jason
>--
>88 Wrangler - 157K miles and counting
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>