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Race Concepts - CBR250R - now tuned!

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  • The new version of our CBR250R is out. Running exceptionally well and makes a little more power over the previous version. Will post pics shortly.
    sigpic
    [email protected]

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    • Originally posted by Joel View Post
      The new version of our CBR250R is out. Running exceptionally well and makes a little more power over the previous version. Will post pics shortly.
      If possible try posting a 0 to 100 video. That should convince a lot of the CBR250 guys here.

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      • Originally posted by bprags View Post
        That should convince a lot of the CBR250 guys here.
        Wouldn't DYNO be the standard way
        Skill is what keeps you on a Motorcycle
        Awareness + Skill is what keeps you out of harm's way
        ATGATT + Awareness + Skill means you might Live To Ride another day

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        • Originally posted by aargee View Post
          Wouldn't DYNO be the standard way
          Hmm, I don't mind even that, but I believe a video showing 0 to 100 would also be helpful. The more info the better isn't it?

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          • Originally posted by bprags View Post
            but I believe a video showing 0 to 100 would also be helpful.
            Not to mention more "dramatic"!!

            sigpic

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            • Originally posted by bprags View Post
              The more info the better isn't it?
              Dyno is the standard in the industry norms; more over 0-100 depends on several external factor like weight of rider, wind & most importantly surface gradient. Also dyno helps to understand the true increase in performance between the stock & mod.
              Skill is what keeps you on a Motorcycle
              Awareness + Skill is what keeps you out of harm's way
              ATGATT + Awareness + Skill means you might Live To Ride another day

              Comment


              • Originally posted by Joel View Post
                ^Nope. FYI, you cannot read the map. You can only peep into the parameters. A diagnostic tool will give info such as coolant temp, rpm, sensor errors. TPS readout, fuel correction and voltage.
                Great - I check this thread twice daily

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                • Real world acceleration figures are more realistic than dyno numbers. End of the day, all those curves have to translate to serious acceleration.
                  Its very typical that a lot of muscle cars dont relate to their real onroad performance. Will post a video for sure soon. Havent been able to find time.
                  sigpic
                  [email protected]

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                  • Real world acceleration figures are more realistic than dyno numbers
                    Don't think so; how does one measure the increase/decrease in the torque or the HP or how much percent the performance is increased? Then how's the work done measured? If everything were based on video's & 0-100's then we'll not have a tech spec sheet, but videos from the manufacturers isn't it?
                    Skill is what keeps you on a Motorcycle
                    Awareness + Skill is what keeps you out of harm's way
                    ATGATT + Awareness + Skill means you might Live To Ride another day

                    Comment


                    • impressive stuff. Good work, Joel
                      CRAP Blog

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                      • Originally posted by Joel View Post
                        The Honda CBR250R has been the most awaited quarter litre motorcycle globally with an unmatched price tag and build quality that is as good as its big brothers. Honda has managed to do a lot of value engineering to keep costs low and yet offer up to date technology. The CBR250R literally shares the same engine configuration as the bigger and meaner CBR1000RR. However in stock trim, the engine lacks poke and begs to be tweeked. Being a global model and Honda having launched the CBR all over around the same time, its anybody's game now to get the best out of this machinery.

                        After spending 3 years with the awesome R15, I have now moved to the CBR250R with some serious development plans.
                        Honda has done a brilliant job with the CBR, but it leaves a lot of work to the engineer to take it to next levels. After stripping down a brand new engine, I decided to take up the whole process in stages. Starting off with the intake system to optimize the airflow path and then moving to the cylinder head. The CBR needs a lot of work to make it perform and turn it into a screamer.
                        Next is the exhaust system that it badly needs and the work is now in progress(we will announce the exhaust soon). My first plan was to make the CBR250R a serious performer, yet keeping the stock exhaust to make it a pleasurable experience for touring and daily commute, along with some good bump in fuel efficiency.
                        So I did the following mods to turn it into a silent screamer.
                        *Reworked cylinder head with reprofiled combustion chamber.
                        *Altered port geometry to enhance flow efficiency
                        *Modified intake system
                        *Race Concepts, stock replacement filter

                        The engine internals are all stock. Cubic capacity is 249cc and we have a lot of plans in store for the CBR in the coming stages.

                        After a test ride of 800kms (Bangalore - chennai) in under 12hrs, there was not a sign of stress from the engine, even under flat out riding. As expected, the fuel efficiency bump was quite good with 28.5kmpl under full flat out riding and 33kmpl with a slightly milder riding style. There is ample power on demand for overtaking tasks and enough grunt to keep the speedo clicking over 120kph all-day. It was one of my best rides on an Indian bike till date, with the engine performing delightfully all day. I havent been touring on bikes since over 3 years now, but now this CBR ride has kicked me all over.

                        We are now offering this package as a level one upgrade for the CBR250R. The bikes will need to come to bangalore for the upgrade. This is the ultimate package any tourer can ask for. Bullet proof reliability with thrilling performance.
                        Expect more goodies in the coming months for the CBR from Race Concepts. The first bolt-on offering will be our Exhaust system and our custom air filter, which will be made available in the next 10 days.

                        The CBR has a lot of potential and we will ensure our best efforts to extract the most out of the package. Parellely our race developments have already commenced and very soon, we will have a full fledged all-out CBR ready in the coming months. I'm personally quite thrilled over the CBR project and we will let the results speak for itself.

                        Pls send requests to [email protected]

                        Dyno plots now updated. Making over 2hp with the stock internals and pump gas. Only cylinder head tweek and our custom airfilter.

                        EDIT - Our second CBR is now ready with all the above mods and our custom tuned multistage exhaust system. Makes more horsepower than the green machine


                        Joel
                        Went through the entire blog.... It not only sounds promising but simply amazing....


                        @Joel.... Will be riding down to Banaglore pretty soon... will definatly like to drop by... am hoping to tweak by own CBR a lil bit...


                        Great going brother... please upload some videos would love to listen to the tweaked engine...

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                        • @ Joel:

                          Pretty amazed by your awesome works.
                          I got R15 v2.
                          I have a question whether R15v2's stock engine could be replaced with CBR250. If so what would be the appropriate cost.

                          One more query,
                          I have completed just about 200 Kms and my exhaust is completely coated with carbon deposit (inside of the exhaust. Found by letting the small finger in and my finger was totally black). Is this the sign of rich mixture?

                          And my brother used to take my r15 out for various reasons ( but he promised me not to cross 5K RPM mark though). Will that affect my engines performance, as I heard from many of them that the bike during run in must be handled single-handed.

                          Please help me out with the following queries as I believe you are the right person to believe.

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                          • Pardon me if i'm asking wrong question but what is Yoshimura exhaust system for cbr 250r ? Does it really help to increase hp ?
                            The Power of Kawasaki Ninja 250r is with me

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                            • Originally posted by aargee View Post
                              Don't think so; how does one measure the increase/decrease in the torque or the HP or how much percent the performance is increased? Then how's the work done measured? If everything were based on video's & 0-100's then we'll not have a tech spec sheet, but videos from the manufacturers isn't it?
                              Well read my previous post clearly. I said real world performance in the end is what matters the most. You can always cheat a dyno number with tampered correction values. You cant do that to real world numbers.
                              Ofcourse there is a dyno reference to note the difference, before and after a mod. Precisely the reason why I also have dyno charts for my headwork, exhaust etc. What I choose to reveal is my own call. A few more updates before I reveal the final charts.

                              @rick - Sure. NO worries. Anytime.

                              @gklc811 - Dont worry. Not a big concern. Carbon deposit is common with the initial run-in. Will clear out as the rings begin to seal better over the next few hundred. CBR engine in an R15, very interesting recipie, but finding a CBR engine and getting to precisely plonk into an R15 is not very easy.
                              sigpic
                              [email protected]

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                              • Originally posted by Joel View Post
                                Ofcourse there is a dyno reference to note the difference, before and after a mod
                                That is precisely what I'm waiting to hear
                                Skill is what keeps you on a Motorcycle
                                Awareness + Skill is what keeps you out of harm's way
                                ATGATT + Awareness + Skill means you might Live To Ride another day

                                Comment

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