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Knock counts readings with Datamaster

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Old Nov 4, 2011 | 09:36 PM
  #1  
Rij1's Avatar
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From: Ventura, Ca
Knock counts readings with Datamaster

My data chart off datamaster says My knock counts get higher after reving the engine and stays till reved then goes higher and over and over. from idle4703-rev6087-rev7575-rev7575-rev7575-rev9112-rev11536 this isnt normal is it?
This was over 11 min period of running the car
Old Nov 4, 2011 | 11:13 PM
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Re: Knock counts readings with Datamaster

Knock counts are cumulative. They will rise until the counter resets, then it starts over. The more important register is knock retard.
Old Nov 4, 2011 | 11:51 PM
  #3  
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Re: Knock counts readings with Datamaster

Ok, do you think the problem i'm having with my car can be diagnosed with the datamaster program I have?

https://www.camaroz28.com/forums/sho...d.php?t=829281
Old Nov 5, 2011 | 03:06 PM
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Re: Knock counts readings with Datamaster

Maybe.. can you record a data log and post it up on a file sharing site ? We can take a look at it to see if something is obviously wrong, timing, AFR, etc..
Old Nov 6, 2011 | 01:20 AM
  #5  
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Re: Knock counts readings with Datamaster

OK, here is the datamaster chart with the car sitting in the driveway
http://www.mediafire.com/?9k5qllty859bb79

Here is the datamaster chart with me driving the car.
http://www.mediafire.com/?1cute97r0us2auq

I dont know if I posted these charts right and that there viewable

Last edited by Rij1; Nov 6, 2011 at 01:26 AM.
Old Nov 6, 2011 | 09:57 AM
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Re: Knock counts readings with Datamaster

Looked at both logs I saw the knock counts incrementing in the idle log, but to tell the truth I never tried reving to over 4K in neutral during a trace so I really don't know if knock is normal or not under those conditions. So I concentrated on the 1st drive.uni file as I like to see data under driving conditions.
-Your fueling is excellent with BLM's staying very close to the 128 +/- 5 mark
-The O2's are switching evenly and at good levels
-Baro reading is a little high at 102.2 Kpa but not a problem, MAP readings are normal for stock cam.
-Timing is good (stock)
-TPS voltage is good (0.65 @ 0%)
-IAC readings are good
However I saw your injector duty cycle is hitting the red line, meaning you may have a fueling problem during the WOT runs. Record #2061 shows 83.1 and 84% where 85% is considered the dropout point. You had no knock then but did when you hit 2nd in record #2079 your DC was in the high 60's approaching 80% in record 2088. That DC is 20-30% higher than my car when it had a stock cam and top end. I would get a fuel pressure gauge on it and verify pressure at idle and under WOT conditions, you could be leaning out under load. Other wise I can't see any other problems.. Are you running 91 octane or better, do you hear any pre-detonation or rattle around the engine. There are things to try after you verify FP. Good luck.. keep us up to date..

Last edited by bobdec; Nov 6, 2011 at 09:59 AM.
Old Nov 6, 2011 | 01:21 PM
  #7  
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From: Ventura, Ca
Re: Knock counts readings with Datamaster

I'm running 91, When I'm accelerating under 22-2500 rpm's it hesitates and some times jumps (maybe pre-detonation)then after I pass that range the car seems fine.#20996-22022 is an area where when driving I notice the car hesitates, this area i'm in second accelerating to and from every road bump on my street. I dont know about the charts but I now by driving the car.

I previously did a fuel pressure test, here is the ulr to it.
https://www.camaroz28.com/forums/sho...d.php?t=833912
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