Anything about Ford EEC tuning. TwEECer and Moates questions dominate, but there's some SCT and OBD-II knowledge too.

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2Shaker
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Logging Spark Source questions

Post by 2Shaker » Mon Jun 02, 2008 11:31 am

Hi guys,

In a recent thread sailorbob described the sources of spark that can be captured in a log for CBAZA. And CBAZA32.xls now has the descriptions he provided included. Over the weekend I was able to capture a log of about 70 minutes long and the chart below shows the count of spark source by code for all of the 40K plus lines in the log:

Count-------SPK_SOURCE------Description
16425-------11--Oscillation modulation modifying base
13006--------1--Base
6029---------9--Idle feedback
1753---------8--Idle feedback at minimum clip
1599---------15--?
1062---------12--Oscillation modulation modifying borderline
457-----------2--Borderline
10-------------5--Vehicle speed limiter torque truncation (if not using torque control)
2--------------3--Torque control (if using torque control) or Tip-in torque truncation (if not using torque control)

I have 2 questions:

1) I can't find spark source "15" and you can see I have 1599 entries in the log. Is it bad data or an as yet to be defined source?

2) "Oscillation modulation" - what is it and what's driving it?
94 GT, CBAZA/J4J1, 347 (on a R302 block), F303 cam, Performer II Intake, 1.7 Crane RR's, 1 5/8 Shorties, 70MM BBK TB, C&L 85mm Tuner MAF, Pro-Charger D1SC, 60#'s, TKO 600. Runs 11:80's

2Shaker
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Post by 2Shaker » Tue Jun 03, 2008 10:47 pm

ttt
94 GT, CBAZA/J4J1, 347 (on a R302 block), F303 cam, Performer II Intake, 1.7 Crane RR's, 1 5/8 Shorties, 70MM BBK TB, C&L 85mm Tuner MAF, Pro-Charger D1SC, 60#'s, TKO 600. Runs 11:80's

stanger007
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Re: Logging Spark Source questions

Post by stanger007 » Thu Jun 05, 2008 11:37 am

I can't find any mention of spark source of "15".

From CRAI8:

OSCMOD stands for oscillation modulation. Engine torque is modulated via spark advance as a function of the rate of change of
rpm in order to stabilize oscillations in rpm. This is a derivative control method and functions as a dashpot. This correction
may be useful during closed throttle or negative crowd decelerations to control shuffle. It can also be used without
interference with feedback spark. The areas and magnitude of correction are controlled by non-zero values in FN2020.
'95 GT Auto - CBAZA 'vert [11.01@127.65 on 154k stock shortblock]
'72 Mach 1 - A9L EFI Conversion Complete, FAST ECM/331/Turbos next
'07 GT Auto [12.86@107 Tune/Boltons]
Total Performance Solutions Dynotuner

2Shaker
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Re: Logging Spark Source questions

Post by 2Shaker » Fri Jun 06, 2008 12:01 pm

sailorbob, any ideas?
94 GT, CBAZA/J4J1, 347 (on a R302 block), F303 cam, Performer II Intake, 1.7 Crane RR's, 1 5/8 Shorties, 70MM BBK TB, C&L 85mm Tuner MAF, Pro-Charger D1SC, 60#'s, TKO 600. Runs 11:80's

sailorbob
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Re: Logging Spark Source questions

Post by sailorbob » Sat Jun 07, 2008 11:24 am

I cannot see 15 used in the CBAZA code but it seems odd for it to occur so many times and yet be an error :confused:

2Shaker
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Re: Logging Spark Source questions

Post by 2Shaker » Sat Jun 07, 2008 9:42 pm

sailorbob wrote:I cannot see 15 used in the CBAZA code but it seems odd for it to occur so many times and yet be an error :confused:
I was waiting for you to weigh in on this - thanks. I dunno either. I wish I knew what to change to reduce the "modulation".
94 GT, CBAZA/J4J1, 347 (on a R302 block), F303 cam, Performer II Intake, 1.7 Crane RR's, 1 5/8 Shorties, 70MM BBK TB, C&L 85mm Tuner MAF, Pro-Charger D1SC, 60#'s, TKO 600. Runs 11:80's

stanger007
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Re: Logging Spark Source questions

Post by stanger007 » Thu Oct 02, 2008 9:04 pm

How about 15 = Output State Control

Now what that is I am not quite sure yet. :)

Wes
'95 GT Auto - CBAZA 'vert [11.01@127.65 on 154k stock shortblock]
'72 Mach 1 - A9L EFI Conversion Complete, FAST ECM/331/Turbos next
'07 GT Auto [12.86@107 Tune/Boltons]
Total Performance Solutions Dynotuner

sailorbob
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Re: Logging Spark Source questions

Post by sailorbob » Tue Jul 08, 2014 8:42 am

15 = Vehicle speed limiter torque truncation with oscillation modulation

2Shaker
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Re: Logging Spark Source questions

Post by 2Shaker » Wed Jul 09, 2014 6:39 am

Wow, thanks Derek. I forgot I even ever asked about that.
94 GT, CBAZA/J4J1, 347 (on a R302 block), F303 cam, Performer II Intake, 1.7 Crane RR's, 1 5/8 Shorties, 70MM BBK TB, C&L 85mm Tuner MAF, Pro-Charger D1SC, 60#'s, TKO 600. Runs 11:80's

sailorbob
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Re: Logging Spark Source questions

Post by sailorbob » Thu Jul 10, 2014 1:39 am

Me too but it popped up whilst I was looking for something else so I thought I'd answer it :biggrin:

decipha

Re: Logging Spark Source questions

Post by decipha » Thu Jul 10, 2014 7:06 am

now this is what i call service

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