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Old 07-17-2013, 01:33 PM   #1
cbman
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4K Knock on Zetec Pulling Spark

So, I've always had the issue of the knock sensor pulling spark around 4K RPM on my Turbo Zetec Cougar. I've tried reducing the spark in that RPM range, but that doesn't help much.

Does anyone know how I can prevent this false-triggering at 4K while still using the knock sensor in the tune?

Here's a little history on my custom tuning or lack of:
http://www.focusfanatics.com/forum/showthread.php?t=145827
I also did have to replace my head gasket last year.


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Old 07-17-2013, 10:34 PM   #2
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I have that ecu code now if you want to shoot me your file

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Old 07-29-2013, 12:39 PM   #3
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Turbo Zetec Cougar Tuning

Tom, you said to log PID's, but the following SCT post and document make it appear that DMR's (all caps) are preferred over PID's. So, what's better/faster to log DMR or PID?

Random SCT post:
http://www.focusfanatics.com/forum/s...0&postcount=13

SCT Datalogging PDF:
http://www.sctflash.com/software/Con...atalogging.pdf
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Old 07-29-2013, 03:59 PM   #4
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DMR take more to log but are more accurate ,

pid log quicker but are less accurate

I do pid as they log well and if there is issues I will add whats needed to find it also a shorter list makes the pid and DMR more accurate

Like I said in the email I can take over and set this up for you

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Old 07-31-2013, 04:13 PM   #5
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Apparently I'm not allowed to post attachments. What do I need to do to post attachments?
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Old 07-31-2013, 05:14 PM   #6
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Looking at one spot in a log file wont be much help you need to see many things to find an issue

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Old 08-14-2013, 09:08 AM   #7
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Tom, thanks for the tips over the phone a week and a half ago. Sorry I haven't had a chance to test the changes since I was on vacation.

Regarding the base fuel table, is it okay to use 0.85 (12.5 AFR) for all load ranges from 0.5 to 0.8? You had said I could take out some fuel in the lower RPM ranges before the turbo spools up, but should I not be commanding 0.75 at 0.6 load? So, effectively ramping down the AFR from 0.5 load to 1.0 load.

In general for the whole forum, why am I not able to post attachments?
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Old 08-14-2013, 09:14 PM   #8
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Give me a call and we can go over it

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Old 08-14-2013, 10:13 PM   #9
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Looks like the only attachments that can be posted are pictures. Files can't be attachments.
Kinda useless if ya ask me.

Something like a datalog, Google Doc's works well.
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Old 09-17-2013, 12:39 PM   #10
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For historical purposes I'll go ahead and post what I found with Tom's help.

The KS was actually pulling spark in the 4K - 6K range, and it was apparrently actual knock. So, I ended up with 8* spark advance at 4K - 5K RPM at 1.5 Load (18psi). That's with 8.5:1 C/R, 93oct, and 100* IAT. Based on reading the Web I though I would be able to get away with closer to 15* spark advance at max load/rpm, but apparently not.

A couple years ago I dyno'd it at 288WHP and for the dyno I was running 14* spark and the KS was turned off. So, I wonder if I had knock and that is why I had to replace my head gasket. I also wonder how much power I lost going from 14* to 8*.
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