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FJR Motorcycle Forums
Technical & Mechanical Problems
Fuel Economy and Smoothness without Compromise
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<blockquote data-quote="UselessPickles" data-source="post: 864151" data-attributes="member: 3256"><p>Also, the 0.5% variation in RPM was under the most perfectly smooth conditions. As my previous post indicates, it would often exceed 2.3% variation when as far as I could tell, I was cruising perfectly stead, and there were no accompanying fluctuations in throttle. So it was probably a bump or slight slip that was enough to allow the RPM to change by over 2.3% for at least one revolution, but not enough to physically jostle me into twitching the throttle. The 3% throttle twitches require very noticeable bumps. Unfortunately, I don't have any raw RPM data to show just how much it can vary when hitting bumps/dips/etc.</p><p></p><p>Sorry if my initial report was misleading with data. The amount of info I have been considering over the past several days and the number of factors I have been tweaking is a bit overwhelming and difficult to fully summarize.</p><p></p><p>BTW - I can't trust the RPM data from my AFR Tuner data logs, because they are most likely already smoothed/filtered. I had to write some extra code to store raw RPM readings in my chip's on-board EEPROM. There's only enough room for about 8 seconds of RPM data, so I can't get a full picture of how the raw RPM readings fluctuate during a wide range of conditions. This is the reason for the lack of details stats about RPM fluctuations. I have been able to monitor throttle readings on my device while hooked up to the laptop and the engine was not running, so I know that the throttle readings are very consistent and smooth. I think it's safe to assume that the throttle in my data logs very closely, if not exactly, matches what my device is reading.</p></blockquote><p></p>
[QUOTE="UselessPickles, post: 864151, member: 3256"] Also, the 0.5% variation in RPM was under the most perfectly smooth conditions. As my previous post indicates, it would often exceed 2.3% variation when as far as I could tell, I was cruising perfectly stead, and there were no accompanying fluctuations in throttle. So it was probably a bump or slight slip that was enough to allow the RPM to change by over 2.3% for at least one revolution, but not enough to physically jostle me into twitching the throttle. The 3% throttle twitches require very noticeable bumps. Unfortunately, I don't have any raw RPM data to show just how much it can vary when hitting bumps/dips/etc. Sorry if my initial report was misleading with data. The amount of info I have been considering over the past several days and the number of factors I have been tweaking is a bit overwhelming and difficult to fully summarize. BTW - I can't trust the RPM data from my AFR Tuner data logs, because they are most likely already smoothed/filtered. I had to write some extra code to store raw RPM readings in my chip's on-board EEPROM. There's only enough room for about 8 seconds of RPM data, so I can't get a full picture of how the raw RPM readings fluctuate during a wide range of conditions. This is the reason for the lack of details stats about RPM fluctuations. I have been able to monitor throttle readings on my device while hooked up to the laptop and the engine was not running, so I know that the throttle readings are very consistent and smooth. I think it's safe to assume that the throttle in my data logs very closely, if not exactly, matches what my device is reading. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Fuel Economy and Smoothness without Compromise
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