Quote:
Originally Posted by sam9s
Ok now I think I have to dig in.......
well what do you guys understand when you say Fuel mapping....Hydbiker, KK_rtr????? If you ask me Fuel mapping is a theoratical graph that displays the optimum fuel enrichment at a given RPM. This fule map is used as an input for EFI (Elecrtonic Fuel Injection System) for regulating air/fuel mixture. now this EFI is not used in bikes (except the RTR-FI and may be FZ as well.....) but our good old carburattor is been modified to perform better......so comes the TPS (THROTTLE POSITION SENSOR......) which is what we have in GSR (not sure abolut fazer)....
Throttle position sensor sends signal to the engne controll unit (ECU) which in turn controlls the ignition and fuel injection timings which again is what Fuel Mapping is. So saying that we can not do fuel mapping with carburettor is wrong.
Now what I believed was or may be I still believe is that the ECO PWR mode we are talking about is electronically connected with the TPS sensor and adjusts the TPS depending up on the mode choosen.........which in turn adjusts the fuel mapping. Like for eg if the TPS idealy directs the ECU to do x% of fule mapping at a particular throttle position it would differ if the PWR mode is selected and same for ECO mode.................Thats what I think......I hope I made some sense....
Again I might be totally wrong for the latter part but the former one I presume is correct.
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You are right on the former part, except for the acronym of ECU-it stands for Electronic Control Unit. Please go through this article to know what the ECU does&how fuel injected bikes are different from carbed bikes.
The Hindu Business Line : Carburettor versus EFI
Coming to the TPS part, you are right, it is a modern carb system, which comes closer to a fuel injection system, compared to the traditional carb method. Based on the throttle position, the carb works on pumping in the air-fuel mixture.
Now for your final part-the technology could work, but it would be too expensive&even difficult to implement on a 150cc carbed machine. Even if they do implement it, the change in character of the machine would not do justice to the 2 modes, considering the amount of power it has on tap. For example, the Busa has 3 power modes, which actually change the mapping of the ECU according to the mode selected. Now, if you blip from A to C mode while running, you can feel the difference in thrust in the Busa!
Coming to the GS, the Eco-Power modes are merely an engine rpm indication, suggestive of ideal rpm shifts to next higher gears. Behind the scene, the carb is doing its job based on the TPS.
So, riding in Economy mode would definitely mean you are opening up the throttle less. If you are opening the throttle less, based on the throttle position, the carb is going to conserve fuel, thereby ensuring mileage!
So, hope you understood the indirect way in which it works!
