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Timing knock sensor help

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Old Aug 3, 2008 | 03:35 PM
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Default Timing knock sensor help

I have an 07 Ultra with Rinehart true duals and a SEAC running a PC3 I have tuned this bike with a Daytona sensors twin scan plus wego to 13 2 afr on an advanced map when I run a data log I see that the knock sensors are removing up to eight degrees of timing from 250 to 3000 rpm in the 10 to 40 percent tp If I back timing out of the PC3 map in this area it does not help&nbsp\\;\\\\\\; and the spikes still show up I loaded a richer map and it helped some but again if I remove timing I does not stop the knock senssors from removing more timing Is this normal or what can I do to get a flat line with no knock retard any help would be appreciated as I am at my wits end with this thing I cannot hear any pinging but these 07s are so noisy that I can not really tell

also when I look at the data log the spikes are not related to quick throttle blips but seem to&nbsp\\; appear as the map sensor position rises

I also enabled the accelerator pump feature.
 
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Old Aug 3, 2008 | 04:00 PM
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Default RE: Timing knock sensor help

Your PCIII is working off TP and RPM and the ECM timing table is working off kPa and RPM they don't match up
 
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Old Aug 3, 2008 | 04:25 PM
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Default RE: Timing knock sensor help

ok Doc so what do I do now
 
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Old Aug 3, 2008 | 04:29 PM
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Default RE: Timing knock sensor help

Good question.&nbsp\\; Are the frt and rear cylinders spiking at the same time? Seems to me if it's pulling out 8 degrees you will be able to hear that.
 
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Old Aug 3, 2008 | 08:18 PM
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Default RE: Timing knock sensor help

"&gt\\;\\\\\\;\\\\\\\\\\\\\\;\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\;

You would think so that is why this is so frustrating look at the attached pic and you will see what i mean
 
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Old Aug 3, 2008 | 09:03 PM
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Default RE: Timing knock sensor help

Sorry I'm 59 now and I can't read that graph
 
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Old Aug 3, 2008 | 09:19 PM
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Default RE: Timing knock sensor help









That may be better I sent it to you via email also Doc
 
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Old Aug 5, 2008 | 02:15 PM
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Default RE: Timing knock sensor help

Update, I was able to eliminate almost all timing spikes by removing 3 degrees over a broader range on the map. It seemed that if I took out timing in just the areas affected, once I accelerated past those areas the spark map went back to zero, and cause a jolt to the system causing a spike. With -3 in all cells from 5-80 tp and 1000 to 4500 rpm I only have an ocasional knock sensor activation of -2 degrees or so. That mainly happens below 2400 rpm when lugging the engine, which I try not to do.&nbsp\\;
 
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Old Aug 5, 2008 | 02:24 PM
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Default RE: Timing knock sensor help

Does the power commander modify the timing out of the ecm or override it?
 
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Old Aug 6, 2008 | 02:52 PM
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Default RE: Timing knock sensor help

I believe it overrides it by manipulating the settings comming out of the ECM. I had to cover a broader area of the map to get it to take out what I needed.
 
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