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nyet
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« Reply #30 on: January 12, 2013, 07:18:47 PM »
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And I still maintain that it's a hardware fault.
I'm definitely leaning this way as well; some cars show very noisy rpm data, some don't... could it be that the crank position sensor hardware simply ages some and starts to get flaky? Also, referring to another post which said altering KFDMDARO wasn't sufficient... if dmar > 50 then something really is up.... |
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« Last Edit: January 12, 2013, 07:37:28 PM by nyet »
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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julex
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« Reply #31 on: January 13, 2013, 08:27:19 AM »
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I will swap cps to a different one and see where that gets me. Flywheel tone ring was impeccable when I was installing it so I am not leaning towards that being the culprit here but my chinese $12 CPS might be. The fact is that I accidentally ripped out cables out of my original CPS when removing tranny from iengine for n-th time (my build is a streak of unlucky events), forgot to uplug it  . Just to illustrate what I am talking about in my car. This is during WOT pull which is fairly smooth sans the timing retard which is definitely detectable. Look at delta RPM:
nmot_w zwout delta rpm b_zwvs
4962.75 8.25 79.25 1
5019 13.5 56.25 0
5025 15 6 0
5173.25 8.25 148.25 1
5188.5 15.75 15.25 0
5312.5 7.5 124 1
5336 12.75 23.5 0
5420 8.25 84 1
5476.25 11.25 56.25 0
5605.25 7.5 129 1
5566.75 12 -38.5 0
5648.5 7.5 81.75 1
5782.5 12 134 0
5744.75 12 -37.75 0
5905.5 8.25 160.75 1
5915.75 12.75 10.25 0
6006 12.75 90.25 0
6055.5 12 49.5 0
6162.5 7.5 107 1
So yes, it is a bit messy. I will look at other peoples' logs to see if they also get that. |
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« Last Edit: January 14, 2013, 07:10:16 AM by julex »
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nyet
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« Reply #32 on: January 13, 2013, 07:16:12 PM »
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I don't generally see any negative delta rpm during a pull in any of my logs.
Do you have an external rpm pickup (e.g. for a wideband)? Perhaps its injecting noise?
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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julex
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« Reply #33 on: January 13, 2013, 07:45:25 PM »
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I have zeitronix that picks the signal up from rpm feed to cluster. I am not clear if this is direct feed from sensor, but I doubt it.
When setting up zeitronix I had to specify for it to divide signal by 6, which hints at the fact that ECU basically sends a signal for each cylinder at TDC or BDC, whichever, to the cluster. So it is not a direct feed from sensor by any means.
I installed second CPS just a moment ago, unfortunately it is the same chinese knock off as previous one so I don't expect any changes.
If this doesn't help, I will buy some quality CPS (maybe used or something) and see where I am at.
Thanks.
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phila_dot
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« Reply #34 on: January 13, 2013, 08:22:57 PM »
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Have you been able to log those variables that I added?
I'm curious to see the result.
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prj
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« Reply #35 on: January 14, 2013, 02:59:34 AM »
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This is either clutch slip or pickup issues.
Fix this before you do anything else.
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s4rmm
Jr. Member
Karma: +4/-1
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Posts: 28
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« Reply #36 on: January 14, 2013, 05:16:49 AM »
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Seems I'm having the same issue as julex, messy rpm.
I need to check older logfiles to see if this has always been like that.
And I have Zeitroniz Zt-2 installed with rpm signal taken from the same place as julex. Coincidence?
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julex
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« Reply #37 on: January 14, 2013, 06:50:27 AM »
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Have you been able to log those variables that I added?
I'm curious to see the result.
I'll log, most likely today. Was busy this past weekend with family, kids, etc  New CPS does the same... I can probably rule that out. I will swap ECUs too, I am having my o2 sensor going off line occasionally not solved by swapping sensors either so I will see if ECU solves that. |
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« Last Edit: January 14, 2013, 06:52:01 AM by julex »
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julex
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« Reply #38 on: January 14, 2013, 07:02:35 AM »
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Seems I'm having the same issue as julex, messy rpm.
I need to check older logfiles to see if this has always been like that.
And I have Zeitroniz Zt-2 installed with rpm signal taken from the same place as julex. Coincidence?
So where are people without problems picking the rpms signal from? I understand that coil or injector would work... but I want to avoid tapping into engine harness or run wires into engine bay. Tach hookup is such a neat place to plug zeitronix in. I will disconnect it today (just two screws and cluster pops out, hookup is right there on cluster harness) though to see if there is any change in rpms going wild. |
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« Last Edit: January 14, 2013, 07:21:52 AM by julex »
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julex
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« Reply #39 on: January 14, 2013, 07:04:44 PM »
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I analyzed elect diagrams and RPM feed to cluster is a different circuit from CPS altogether. I disconnected zeitronix just for hahas anyway, no change in rpm readouts... I guess I will get brand (bosch) cps and see where it gets me. Anybody has one for sale cheap? [  ] |
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ddillenger
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« Reply #40 on: January 14, 2013, 07:11:14 PM »
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I have a good used one. Not sure if that helps you, you can borrow it for testing purposes.
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Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience!
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nyet
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« Reply #41 on: January 14, 2013, 07:15:46 PM »
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RPM feed to cluster is a different circuit from CPS altogether.
Forgot to mention, my zeitronix is also connected to that RPM feed... and no problems that I can tell with RPM data. |
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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ddillenger
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« Reply #42 on: January 14, 2013, 10:33:41 PM »
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Just so we're on the same page, I have a spare ckp, not cps.
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Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience!
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julex
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« Reply #43 on: January 15, 2013, 07:47:32 AM »
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Just so we're on the same page, I have a spare ckp, not cps.
Thanks for offer, I just bought one on ebay. $20 for a well looking and working bosch is a good deal. What's CKP ? |
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ddillenger
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« Reply #44 on: January 15, 2013, 09:41:36 AM »
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ckp=crank sensor
cps=cam sensor
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Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience!
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