HydBiker

^^^ you've learnt a nice bit here. Also, instead of confusing this thing so much with the FI systems, may we refer to it as ignition mapping... rather than fuel mapping!

The carb would have multiple stages of fuel flow (more than one - can be two or more!) for various situations and this coupled with various stages of ignition mapping with the digital ignition processor.

The gear shift indicator & the ECO & PWR mode selection may or may not be directly linked to the inside system but it is the user interface to let user drive according to a preference. Gear shift indicator is a good thing... a lot of people out there don't understand a think about gears. They revv the nuts & bolts out of an engine in low gears but they do not cross 40/50 KMPH in top gear. They understand only Speed.

I think it was Nissan that got this shift indicator concept (possibly not exactly the same stuff as on the GS150) first into a production car to help the driver get better fuel economy... an year or two ago and that system was praised enough. People reported its benefits.

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animeher

@Sam9: What's the mileage you are getting currently, in City, with the running in low speed riding?

sam9s

You are so right here....

@ani thanks you brought the milage part, this update was pending for long. Ok so till now I have covered 400KM on my bike with 200 not crossing speed 60 another 100km not crossing 65 and the last 100 not crossing 70. The last 100 is more so important as I drove the bike pushing it a bit in acceleration, you know zip zapping through traffic.........and I must tell you it does it with ease.....believe me very stable, smooth and you get the pull right when you need it.

Coming to the milage......all results are in city ride...

For the first 200KM the very first avg result was around 57Kmpl. For the next 100 they were same may be 56 but more or less same....... for the last 200KM the avg came down to 54-55Kmpl (remember I pushed the bike to an extent).................I think 65-70 is the max speed we usually get driving in city. Also I believe after the first service as the engine gets more attuned we should get better milage than 55Kmpl..........By this we can safely conclude that at all conditions we can expect 55+ milage under city driving which for me for a 150CC is to be appriciated. I will update about the highway avg once I take GSR to a long drive......

So that all the milage part......keep flowing questions and queries.....

Sam

animeher

55kmpl is good.... anything above 45kmpl should be good!

Shadowfax

@sam9: how much more time for 1st servicing? and how fast u rode it?

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sam9s

^^Well I am at 400Km, I think the 1st service is at 700Km so it should not be more than 4,5 days.....maybe this Saturday........
and how fast I drove......are you asking the max speed I touched.....well as I said the last 100Km after I completed 300 I drove at 70....... would not cross 70 till my first service......

animeher

Hey Sam, any update on the bike ownership?

Sarvajit

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!

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sam9s

mmmmm Chalo I was atleast technically right even though the technology is not present in GSR.......never the less completed 650 KM on the bike and its a pleasurable experience.......Tomorrow I will take the bike for 1st servicing though I am still short of 50KM but I guess that should be ok.........from tommorrow I would freeeee to varooom the bike to 80-90.......m excited.....

sankar

TPS doesn't do anything to fuel mapping on a carburetted bike, because it can't. Only thing TPS, on a carburetted bike, controls is the ignition map. On a carburetted engine fuel mapping is done by the following parts of the carburettor - Pilot jet, slide cutaway, needle jet, jet needle and main jet.

What TPS does is it will help the CDI to chose an optimal ignition map based on Engine RPM and throttle opening. Without TPS the CDI choses ignition timing according to Engine RPM. Throttle Position Sensor (TPS) is the eye of the CDI. TPS helps the CDI to see how much the throttle is opened for that given engine RPM and chose the best map.

There is no ECU in the GS150R or any other bike for that matter, except the fuel injected bikes - RTR Fi, P220 and Glamour Fi. ECU you refer to is only a CDI/TCI/IDI ignition system.

Eco and Pwr modes are two different ignition maps.