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@killer so what is to be done if we want the bike to perform better after installing K&N.
@those who asked to contact Bunny note that Bunny is offline since months.
@those who asked to contact Bunny note that Bunny is offline since months.
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Yamaha YZF-R15 is Here -
Hi Guys,
I was the one who posted this query to BikeIndia and I am super glad that just a day or two after I had emailed Bunny, I had a word with Killer and decided not to go ahead with the filter replacement. I guess this is a classic example why Xbhp is such a great resource because you can actually get your doubts clarified from people who truly have the knowledge and expertise in this field. A Big Thanks to Killer and Joel for sharing their knowledge with me.Watch my Baby R1 clock 148kmph at http://in.youtube.com/watch?v=cAHbYl...e=channel_page.Comment
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^^Endless desires, man someone who has already been there and done 148 kmph on his stock baby R1, wandering around to increse the performance by that extra bit.
Sagar bahi ab kya irada hai ??
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Originally posted by BANDHAV View Post^^Endless desires, man someone who has already been there and done 148 kmph on his stock baby R1, wandering around to increse the performance by that extra bit.
Sagar bahi ab kya irada hai ??
Am mighty pleased with her top whack but I just wanted to, as Joel had framed it, "Hit the sweet spot quicker" 
Watch my Baby R1 clock 148kmph at http://in.youtube.com/watch?v=cAHbYl...e=channel_page.Comment
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The R15 has 5 sensors.
Crank position sensor, Throttle position sensor, Intake pressure sensor, Intake temperature sensor and coolant temperature sensor. Its an open loop system and can never adjust to additional changes. Adding a freeflow filter will lean out the mixture even further. You will need to manually richen the mixture by changing the AFR.
The R15 does not have an O2 sensor to automatically vary the AFR.
Open loop systems are cheaper and widely used on low capacity engines.sigpic
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Damn man...i thought the only simple mod that could be done to an R15 was the filter...now even that seems to be a complex affair....btw...can a aftermarket lambda(O2) sensor be fitted to the R15's system ..??'68 Jawa 250 ,'76 Yezdi 250, '85 RD350, '88 RD350 , '95 TZR250 3XV, '01 RX 135 5speed, '05 Pulsar 180Dtsi V1
"You live more in five minutes on a bike like this(Indian Scout) going flat out than some people live in their lifetime" - Burt MunroComment
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that would require an entire change in the system.. after all the ECU has to understand the sensor to actually do something !
not possible practically i reckon.
but note that you CAN change the AFR by some instrument Killer has mentioned. but you have to know who has such an instrument !A man's testosterone level is directly proportional to bhp that he's using on his motorcycle.Comment
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Just checked out the wikipedia. They say that a separate O2 sensor can be attached to the vehicle and Air Fuel ratio can be tuned for high performance. 2 Types of meters are available: narrow band and wide band, later being more efficient. This will also determine the fuel being lean or richer. But I am not sure how this system will be attached to the ECU of R15.Originally posted by Joel View Post
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Half knowledge can cause damage. Can you throw some light on it ?Last edited by vibhanshu; 01-21-2009, 04:17 PM.Fear is the Trigger!Comment
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The sensor may be available, but how do u plan to attach it to the ECU? The ECU should support these inputs and calculate the fuel inputs accordingly. I do not think it is as easy and cheap as it looks. Cos if it were so cheap and easy, the companies would have very well used the closed-loop system instead of the open-loop system.Democracy is when 2 wolves and a sheep meet to decide who is for dinner. Liberty is when the sheep has a gun.Comment
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Thats what my question isOriginally posted by Aparajith View Post Trying to know the Ins and Out of the bike.
Fear is the Trigger!Comment
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U can fit an O2 sensor and get the AFR values using an AFR meter. However you still need an AFR setting device to make the changes.
The O2 sensor can tell you what exactly the state of the mixture is. Stoich, rich or lean. It will help you head in the right direction.
if you dont have a O2 sensor, you'll need to do your own trial and error by running the bike back to back or set it up on a dyno to see the changes.sigpic
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Thanks Joel. Nice! Does all these things happen at runtime? Or once the ratio is set using the AFR meter then we are good to go?Originally posted by Joel View Post
I am going for a servicing this weekend. Will ask the guys there a bunch of questions. Better I do some more of homework before I post a lot of stuffs here. Now its getting a little complicated
But if this thing works out then I am sure the performance improvement will be great. Any idea how much performance may increase (if all goes well) ?Fear is the Trigger!Comment
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DOnt expect any great bump even with the right AFR. This is not a 200bhp engine, its a pretty lazy 16bhp unit.
if you mess with the AFR without knowing where you heading, you are bound to screw up the fuelling.sigpic
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