Power Vision Information Thread
#951
#952
#953
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So I figured I would use the spark adjustment capability of the PV basic tuner just to see what I would get. I logged a number of good runs that varied alot. The dyno-tuned map was pretty good from a spark perspective but there were a few areas where there were small knock events. Mostly out near 70-90 kpa and 3500-4000 rpms. Again these were relatively small events but I thought I would let the Tuner make the appropriate adjustment.
The tuner lowered the spark and when I logged again the knock event was either gone or reduced to nearly nothing. What I did notice was that the performance of the bike from just this small timing adjustment made a noticeable reduction in performance that could be felt from the saddle.
The tuner lowered the spark and when I logged again the knock event was either gone or reduced to nearly nothing. What I did notice was that the performance of the bike from just this small timing adjustment made a noticeable reduction in performance that could be felt from the saddle.
The problem I'm having is that in my case I see a knock event on the rear cylinder for every log, always around 60-70 KPA @ ~2000-2400 rpm, and it adjusts slightly every time. So far I'm not seeing much difference and continue to allow it to adjust, but am monitoring the situation. If it looks like it's going too far or doesn't eventually stop making adjustments I'll stop the process by unchecking the Spark Knock function before I load it into the tune. So far in quite a few PV Tune procedures I see mostly <1° of retard in only a few areas. I had manually bumped spark advance in the cruise range long ago, so I'm still no lower than stock levels.
Is it possible that the basic tuner algorithym is too aggressive in lowering the timing when it reads a knock event. In any case I went back to the original dyno-tuned map and immediately felt the improved performance. Is it possible that PV tuner is lowering the spark advance more than the ECU knock retard is lowering it which is why I feel the reduced power?
Last edited by iclick; 07-09-2011 at 03:47 PM.
#954
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I stand corrected. My Dodge Magnum hemi has knock sensors physically mounted to the engine. The downside is that sometimes they can produce "false knock" when the displacement changes from 8 cylinders to 4 and back again. I log sometimes 5 degrees of KR during the transition of 8 to 4 and back again.
#955
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I tried doing that for a while, but it wasn't practical for me. From my experience the event lasts only a short time, was intermittent, and you'd almost have to be looking at the display all the time to see them happen. Seeing them in the log file is the best way to check, IMO.
#956
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I tried doing that for a while, but it wasn't practical for me. From my experience the event lasts only a short time, was intermittent, and you'd almost have to be looking at the display all the time to see them happen. Seeing them in the log file is the best way to check, IMO.
#957
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Here are some suggestions I am sending tonight. Any comments by anyone are welcome:
1. The Lambda gauges make very rapid changes that make them hard to read, and it would be useful to have a sampling-rate adjustment. E.g., seeing the values change several times per second or other user-defined rate would be more useful than 50x/sec., or whatever we have now.
2. One suggestion from the forum is to create some practical method to keep track of knock-retard on a PV gauge. As it sits now this gauge isn’t very usable because knock events are (hopefully) rare and you can’t monitor this parameter while riding in any practical way. Perhaps it might show the last value >0.
3. How important is turning off DE and AE when tuning? How do you do it, zero-out all the values in the tables?
4. It would be very useful to have an option in WinPV called “Prepare for tuning,” which would do the following:
6. A gauge panel selection option in the PV. We now have perhaps 15 gauge panels to use, some of which are not readable in daylight (all analog gauges). I use several digital gauges only, and it would be nice if I could scroll through only those I want to see by means of a selection screen. Those selected are shown, those not selected will be omitted from the scroll view.
1. The Lambda gauges make very rapid changes that make them hard to read, and it would be useful to have a sampling-rate adjustment. E.g., seeing the values change several times per second or other user-defined rate would be more useful than 50x/sec., or whatever we have now.
2. One suggestion from the forum is to create some practical method to keep track of knock-retard on a PV gauge. As it sits now this gauge isn’t very usable because knock events are (hopefully) rare and you can’t monitor this parameter while riding in any practical way. Perhaps it might show the last value >0.
3. How important is turning off DE and AE when tuning? How do you do it, zero-out all the values in the tables?
4. It would be very useful to have an option in WinPV called “Prepare for tuning,” which would do the following:
- Automatically set the tables in the tune file that need to be disabled or otherwise changed. E.g., DE, AE, CL, etc.
- Save the tune values needed (VE 1 & 2, AFR Set, Spark 1 & 2) to a user-specified PVV file.
6. A gauge panel selection option in the PV. We now have perhaps 15 gauge panels to use, some of which are not readable in daylight (all analog gauges). I use several digital gauges only, and it would be nice if I could scroll through only those I want to see by means of a selection screen. Those selected are shown, those not selected will be omitted from the scroll view.
#958
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I sure think that it would be nice to be able to use the PV unit itself while it is attached/being powered by my desktop/laoptop rather than just when the PV is being powered by the bike. For example, I would like to be able to set-up my guages, info to datalog, etc. using the PC to power the PV (in PC link mode). I really dislike sitting in my 100 degree+ garage with my bike ignition, lights, etc. on wasting my battery's charge while playing with the PV. I can understand why you can't access/flash the ECM without the bike powered-up, but I don't understand why we can't use the PV unit itself with the PC as a power source. Just a suggestion. Thanks.
Last edited by 883_dave; 07-09-2011 at 10:19 PM.
#959
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I sure think that it would be nice to be able to use the PV unit itself while it is attached/being powered by my desktop/laoptop rather than just when the PV is being powered by the bike. For example, I would like to be able to set-up my guages, info to datalog, etc. using the PC to power the PV (in PC link mode). I really dislike sitting in my 100 degree+ garage with my bike ignition, lights, etc. on wasting my battery's charge while playing with the PV. I can understand why you can't access/flash the ECM without the bike powered-up, but I don't understand why we can't use the PV unit itself with the PC as a power source. Just a suggestion. Thanks.
#960