I know he didnt

Ok got the answer

Now thats called "power tuning" . Buggers dont want others to see how the AFR is set. In the end of 2 days, you'll get a 4 digit bill as well. The difference in performance will be nothing great to write home about.

Whats the average speed u were cruising on??

65 kmph kinta jaasti hoglilva??

he he that bugga would not have gone below 90 kmphr

There is nothing to be surprised about the mileage part. I rode to trichur 2 weeks ago and I got an average of 47kmpl. The speedo has been always in the upwards of 90-100kmph.

Even though the R15 uses an Open Loop FI, it uses an FI system that includes the MAP-Sensor, unlike most other FI systems.

So, it's not as useless an FI system as everyone else is thinking it is.


MAP Sensor:


The MAP sensor can also be used to measure the barometric absolute pressure (BAP sensor) when the engine is not turning, i.e., when the intake manifold is not being evacuated by the engine's pumping action.
When the engine is running, the difference between the BAP and the MAP is the engine's manifold vacuum. As atmospheric pressure decreases with increasing altitude, so must vacuum to maintain the same MAP.
BAP = MAP + Vacuum
(Source: MAP Sensor - Manifold Absolute Pressure)




Once the Intake Air Temperature Barometric Pressure(which can be obtained from MAP as stated above) are determined, the Intake Air Density also can be calculated without the need for an extra Lambda Sensor.

The computer "sees" this data as cylinder air volume and density, and matches this information with any number of pre-programmed "maps", three-dimensional records of that engine’s dyno-determined fuel requirements, and before making a final decision, tweaks the outcome slightly using information supplied by one or more of the most critical sensors (such as engine temperature).

(Source: Fuel Injection)



Alpha-N
There is one other EFI control system that is generally used only in racing called an Alpha-N system. This control system's major inputs are throttle position and rpm. This system was developed because race engines often operate at idle and part-throttle with very little manifold vacuum. This makes using a MAP sensor difficult. This system is less precise than speed density or MAF and is therefore generally only found in racing or on heavily modified street engines with big camshafts. A MAP sensor can still be used with Alpha-N, but it is generally employed as a barometric pressure sensor to detect altitude changes.
(Source: Fuel Injection Basics - Tech Article - Chevy High Performance Magazine)

i'm satisfied with performance of R15 but if i want to use K'N for good exauhst note or good sounding bike can i use it and ask yamaha SVC guys to change the fuel mixture bit rich?

So if some one wants to ride the bike up in Leh, Ladakh and Khardungla.....will the R15 hold good ? Not just cruising but kind of speeding up. Some1 I knw is planning to take the R15 from Khardungla to Manlali in 16 hours non stop riding.....Its a stock R15. Will it perform just as it does under normal conditions.

k&n

i totally agree with the fact that K&N wont work for R15 but i would like to know one thing if at all any one who's fitting a K&N on to his bike wont give him any extra advantages but the quality of air that is sent into the engine migh be a better one and how freely will the air go in through the filter

Darn(wanted to use expletives but resisted)

i regularly get ~28kmpl(almost) in city rides as well as highways
is it okay?

^^what speeds do you guys cruise at to get good FE? i cruised @8k-113-114kmph, as anything below that feels S-L-O-W

Oh this is really an interesting topic and pretty knowledgeable informations... Thanks everyone for the contributions expecially @Killer and @Joel...

@Joel>> So you were at my home town... but i was else where... like to meet you if i was there...

man my Intake pressure sensor is screwed and my bike automatically is running eich and am getting 20 to 25kmpl at even 60km./hr and my bike is very well maintained and did proper run in and goes oil change at every 1000km and am frustrated shud i install k&n or is the sensor avainable

guys can anyone tell me wether ZMR has a open or closed loop system...

ZMR has a closed loop Fi system. The PGM Fi system in ZMR has 5-6 sensors including the exhaust gases metering sensor.

But, not every Closed Loop system is compatible with high flow filters, like K&N's.

There have been older Closed Loop Fi systems that meter fuel flow, for 'weather variation' purposes only, which means upto a certain extent only.

It means that it provides a certain percentage of variation, say +-(5%). High flow filters increase the air flow to a much higher level.
In extremely high air flow case, an 'engine malfunctioning' light may turn on, and the fuel is metered with marginal variation only, which means it would run lean.

However, this situation is about older Closed Loop Fi systems, someone needs to fit a K&N into ZMR to actually test it.