18 Blade for trackbike

Discussion in 'New Members' started by Aale, Jun 18, 2020.

  1. Aale

    Aale New Member

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    Hi CBR forum,

    Bought a crashed 2018 CBR1000RR from insurance auction for track bike build. It seems that the bike had flipped over the nose. It had broken front frame, subframe, rear wheel, fairings, hiss sensor etc...
    Now, a little less than a month later, the bike was ready for first track day. Goal was to get to know the bike and shake off some track rust. I am happy with the end result and she feels easy to ride on the track.
    First trackday feedback:
    • I had not tried a bike with ABS before and the first lap that i tried to push a little more, braking from 220kph the rear wheel started to lift and ABS engaged. For a moment, it felt like I had lost the brakes.
    • Comparing to my 2010 RSV4, the Aprilia seems more aggressive and maybe more tiring for the rider. Also, the V4 engine is more forgiving when exiting a corner with wrong (higher) gear.
    • The bike was measured 98,5db @7000rpm, which is exactly on the limit to fit in the "quiet" class and get better pricing at trackday (60 EUR vs 100 EUR).
    • Stock rear shock makes the bike too unstable when accelerating in the long left corner, from 60kph to 250kph. Hopefully I can find some good adjustment.
    • Not sure, how and when the TC is working and how much can I trust it.
    What viscosity oil do you recommend for track use? 10W40?

    upload_2020-6-18_10-37-50.png
    upload_2020-6-18_10-38-15.png

    Cheers,
    Arvo
     
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  2. Boothman

    Boothman Well-Known Member

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    Hi and welcome to the forum - like what you’ve done there :cool:
     
  3. LRJimmy

    LRJimmy Active Member

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    Hello and welcome
     
  4. PauloHRC

    PauloHRC God Like

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    Hi and welcome to the forum, sounds like a big job you took on there but it seems to have turned out a good move!!

    How much did you pay for it as a right off??
     
  5. Ice Doc

    Ice Doc Member

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    Welcome to the FORUM Arvo. Great bunch of friendly knowledgeable people on here. Like the look of the bike although the seat makes me think I'm getting old (need more padding for me) - and all done in less than a month, wow! Hope the unstable acceleration out of the corner isn't a sign of the frame not being quite right. Enjoy!
     
  6. mk3golfcab

    mk3golfcab Senior Member

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    Hi and welcome Arvo :)
     
  7. Selmer50mark

    Selmer50mark Elite Member

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    Hello and welcome
     
  8. Aale

    Aale New Member

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    I got it just a lttle over 5k EUR.

    Well, it was a busy month with lots of garage hours, googling, and searching parts from ebay. Fortunately I had friends helping me out.
    The instability mostly comes when changing gears up when accelerating, compared to the Aprilia. I am sure the shock can be adjusted better, and the QS is not as smooth as was on the Aprilia. But bent frame/swingarm can be a factor... I have next trackday on Monday, I will try to change some settings and see if I can get better results.
    Oh, and the blipper is a nice thing to have :)
     
  9. BlackDevil

    BlackDevil Elite Member

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    Hi and welcome !
     
  10. dmc12

    dmc12 Member

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    Hi Arvo, what size tyres are you running? See the multiple threads about traction control / QS function when you change sprockets/tyre size etc. You need to be running stock sprocket sizes and tyre size (190/50) for the electronics to function correctly.

    Dare I @RC45 ? :D
     
  11. Mr_Chin_LK

    Mr_Chin_LK Member

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    Hi and Welcome to the forum Avro.

    Chin
     
  12. RC45

    RC45 Active Member

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    You rang? ;)

    What you experienced is the rear wheel lift mitigation. If the bike feels the rear wheel is probably getting light then it will release the front brake to get the wheel down.

    Cool feature for the road but a dangerous feature for the track.
    If you don't feel you need ABS then just pull the ABS fuse.
    Because wheel speed sensors are routed through the ABS module circuitry, you need to leave the ABS modulator in place but can pull the fuse to disable the ABS function.

    What size rear tire are you running? What size sprockets are you running? What TC level are you running on?
     
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  13. Aale

    Aale New Member

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    Thanks for the info. I will pull the fuse next trackday. Probably will run braided lines from mc to calipers in the future.

    I am running Dunlop slicks kr106 120/70 in the front and kr108 195/65 in the rear. Stock sprockets. Unfortunately yesterdays trackday was cancelled and I only have one trackday with the Blade. I think the levels were 1-2-3 in the beginning and later I tried 1-3-2. I need more experience with the tc, to undestand what and how levels work with tire usage. Level 3 with quite destroyed tires was allowing pretty good slides.

    How does the tire size mess with the electronics? Does it show some errors on the dash? Or just act weird? Anything I should keep an eye next time?

    I asked a young world supersport rider about the tc and qs. He is running the same tires with 17 blade and told he has no problems with electronics. He is holding the track record with the blade.
     
    #13 Aale, Jun 23, 2020
    Last edited: Jun 23, 2020
  14. RC45

    RC45 Active Member

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    Is his bike street stock with a street stock ECU or a race bike with HRC ECU?

    Either way, it doesn't matter what he says, the point is that the system has no self calibration ability and any response he is getting from the system is not as intended and he is just riding around the results.

    You will not see an error on the dash because the system has no idea the tyres are different.

    The reality is that the system is going to respond when it determines the rear wheel is slipping based on front vs rear wheel speed differential within the operating range it is calibrated for.

    The system expects the front and rear tyres have a specific rolling circumference and has will respond within those parameters, not what is actually happened in the real world.

    So the fact he can "slide on command" should be all the clue you need that the system doesn't know the bike is sliding and or wheel spinning.

    When the system intervenes you will see the TC light flicker - if you never see it flickering then it is not intervening - mostly because it doesn't know.
     
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