Power Vision Information Thread
#1272
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lol,, ,i was getting same thing and said WTF !... hope to get in more runs this weekend.. wondering how many logs it takes to get it right...
#1273
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I think DJ is working on an AT-100 kit which will include 12mm WB sensors, so the sensors alone should be available, maybe even at a reasonable price. If not, why not just add some 18mm bungs to your head pipe and use both NB and WB together? I believe Fuel Moto's head pipes have both.
#1274
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The warm-up enrichment process only lasts for a short time, around 45 sec. or less with my '07, even if the bike is warm. If you start logging after that point you will not see a value there for the duration of the log. Since I always start my logs well after cranking the bike I never see warm-up values. I think they put that parameter in because if your bike is above the minimum ET, it is cranked, and you start the log immediately thereafter you should see values. That would affect the tune if compensation wasn't made for this.
#1275
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You may have mentioned this before and if so I missed it. You said you had been doing runs in an effort to vary ambient conditions, like one in the cooler temps of the AM and another in the PM when hot. When running open-loop and monitoring Lambda on the display, do you notice much variance when air temp is cool vs. hot? The MAP and other sensors are supposed to compensate for this and altitude, atmospheric pressure, etc. Jamie says it is quite accurate, but I would like to know how much so and if adding the NB O2 sensors and running closed-loop would make a meaningful difference.
As to going back and using the stock O2 sensors - as you know they only work in closed-loop and are supposed to take into account air temp and altitude changes. Well, the ECM already uses Intake Air temp and Manifold air pressure in its calculations so even without the O2 closed loop, the ECM accounts for changes in these variables any way. Honestly, I didn't see any benefit to running closed-loop with the O2 sensors re-installed. Some say that the closed-loop with stock O2 sensors account for change in temp and altitude but once the closed-loop takes control it ignores the air temp and MAP values and locks in on stoich 14.6. The more I study this the more it seems like you should run open loop and let the ECM do it's calculations like it did for all the pre O2 sensor bikes...
#1276
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Moving to a variation of this subject, I know what the New VE table represents in the LT, but in the CSV file I'm not so sure. Does it show an on-the-fly change? If so, what parameters are used in creating this value? I've tried to make sense of it, assuming it is RPM & TP vs. Lambda & Set AFR at a given instant in time, but although it sometimes seems to follow this convention it doesn't always do so. Why is this parameter even included if LT is figuring the New VE?
Last edited by iclick; 09-02-2011 at 11:58 AM.
#1277
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As to going back and using the stock O2 sensors - as you know they only work in closed-loop and are supposed to take into account air temp and altitude changes. Well, the ECM already uses Intake Air temp and Manifold air pressure in its calculations so even without the O2 closed loop, the ECM accounts for changes in these variables any way. Honestly, I didn't see any benefit to running closed-loop with the O2 sensors re-installed. Some say that the closed-loop with stock O2 sensors account for change in temp and altitude but once the closed-loop takes control it ignores the air temp and MAP values and locks in on stoich 14.6. The more I study this the more it seems like you should run open loop and let the ECM do it's calculations like it did for all the pre O2 sensor bikes...
Last edited by iclick; 09-02-2011 at 11:59 AM.
#1278
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Moving to a variation of this subject, I know what the New VE table represents in the LT, but in the CSV file I'm not so sure. Does it show an on-the-fly change? If so, what parameters are used in creating this value? I've tried to make sense of it, assuming it is RPM & TP vs. Lambda & Set AFR at a given instant in time, but although it sometimes seems to follow this convention it doesn't always do so. Why is this parameter even included if LT is figuring the New VE?
If the adaptive fuel is turned off then aff is always 100 and this drops to
Ve new = VE * o2 integrator/100
#1279
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I know what the New VE table represents in the LT, but in the CSV file I'm not so sure. Does it show an on-the-fly change? If so, what parameters are used in creating this value? I've tried to make sense of it, assuming it is RPM & TP vs. Lambda & Set AFR, but although it sometimes seems to follow this convention it doesn't always do so. Why is this parameter even included if LT is figuring the New VE?
#1280
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That value is just where the cursor happened on the graph to be when I did the screen print.
Yes MLV is getting the data from the CSV file and plotting it. It is picking up the VE and New VE at the particular RPM and plotting it on the graph. A sharp 45 degree line shows that the VEs in the tables are close to what is actually happening.
Whittle posted how the New VE value is calculated and it is what is in the CSV file and is used by LT to come up with the new weighted values that it generates.
Last edited by iclick; 09-02-2011 at 02:02 PM.