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Tourer
Posts: 411
Dallas, Texas | Curious about something...
As long as I can remember, with just about any bike that I owned, I was always giving the accelerator a couple of "quick flips" at an intersection. Not excessive, and just a habit really. Now I found that these "quick flips" have a tendency to bog down the Vision, and after about six to seven months of ownership, I have gotten used to not doing that. But now I wonder, is it normal for the Vision not to be able to do that without bogging down? |
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Cruiser
Posts: 117
Spring Hill, Tennessee | I am not a mechanic nor an expert by any means, but if I was to suggest the reason behind the bogging down, it would be the Closed Loop EFI. My understanding of the Closed Loop system is the computer needs time to learn the atmosphere in which the bike is to preform. By blipping the throttle at a stop light, you are throwing fuel and air conditions at the bike that it has not had time to digest.
I am sure more knowledgeable folks will post a more accurate detail.
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Visionary
Posts: 8144
New Bohemia, VA | Tennessee Vision, that too me in my simple mind has been the best answer that I've heard to date. The only time mine will cough and bog now is when the bike is hot and I'm stuck in heavy, creeping traffic. It used to cough all the time through the intake until I fixed the exhaust leak that was compliments of Victory. |
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Visionary
Posts: 3773
Pittsburgh, PA | doesnt the computer ecu make adjustments as soon as the bike is started? temp, air pressure etc? thats how it knows how rich to make the mixture to start the "cold" engine? isnt these adjustments made in seconds or milli seconds before the bike is even fired up..? my understanding of the blurps that make it stall is from a lean condition and thats why Lloyds is selling that New device..? this is the device im talking about. http://www.lloydz.com/store/item_view.asp?estore_itemid=1000078
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Visionary
Posts: 1436
| I've owned a dozen or more FI bikes since they first appeared some years back, NONE of them will tolerate blipping the throttle. You are loading it up and quite frankly burning fuel. It is a habit that dates to the ole carb'd bikes that would load up if you didn't blip but it is not necessary on any modern motorcycle unless you really really need the engine tuned up. |
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Cruiser
Posts: 117
Spring Hill, Tennessee | Open Loop EFI would make adjustments immediately to conditions. The Closed Loop EFI takes several minutes to read and register the atmospheric conditions.
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Tourer
Posts: 411
Dallas, Texas | Teach - 2010-02-08 7:31 PM
I've owned a dozen or more FI bikes since they first appeared some years back, NONE of them will tolerate blipping the throttle. You are loading it up and quite frankly burning fuel. It is a habit that dates to the ole carb'd bikes that would load up if you didn't blip but it is not necessary on any modern motorcycle unless you really really need the engine tuned up.
Thanks Teach. Must be a V-twin or cruiser thing. I have owned a couple of FI'd "crotch rockets", and they did ok with "blips". But as long as it is normal for the Vision, I'm ok. |
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Visionary
Posts: 3773
Pittsburgh, PA | Tennessee Vision - 2010-02-08 7:57 PM
Open Loop EFI would make adjustments immediately to conditions. The Closed Loop EFI takes several minutes to read and register the atmospheric conditions.
http://bikeboy.org/open_closed_loop_efi.html
Open Loop
Open loop simply means there is no feedback of the result to the ECU. In our case, it means there is no sensing or measuring of the exhaust gas to see how the bike is running. The fuel injected is determined by the RPM and throttle position, derived from fuel injector pulse width numbers stored in the fuel maps, and is trimmed for environmental conditions due to air temperature, air pressure and engine temperature.
Closed Loop
Closed loop means there is feedback of the result to the ECU. In our case, it means there is sensing or measuring of the exhaust gas to see how the bike is running. This sensing is done by a probe (a galvanic cell) which generates a voltage based on the gas around it. These probes are referred to as Oxygen sensors, Lambda sensors, O2 sensors, Exhaust Gas sensors and probably a few other names as well. I?ll call it a Lambda sensor. Why Lambda you ask?
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Accelerator
