Online: hdOZMAN93, beaglebasher, STEAMER, skirtster

PV to calibrate speedo - affected by ABS??

  • Onequickpuck
    Onequickpuck
    3 years ago
    G'Day gents...
    I sent the below query to DJ, but thought I would drop the details here as well, in case anyone has direct answers to the query within.
    Cheers!

    Dear Sirs

    My bike is a 2017 Harley Breakout with 103CI stock motor.
    The bike came from factory with ABS, and all works as it should.
    From the factory, the speedo was about 6% generous.
    I put a larger 260 rear tire on, and that brought me 3% closer to true speedometer reading.
    Then however I changed the final drive gearing. -2 up front and +2 out back.
    Now, despite the larger tire in the back, I am still seeing 16% generous readings on the speedo.
    This bike has a factory gear indicator and electronic cruise control (FBW throttle).
    The gearing change has NOT affected the ABS, and the gear indicator reads correctly in all gears and the cruise control works a treat.
    Here's the sticky part.... I purchased and installed a Healtech Speedo Healer V4, and it is a simple plug-n-play device, easy to program, and vastly capable of infinite changes in either direction.
    HOWEVER, if I set it to alter the VSS by -16%, the speedo comes in spot on - BUT the gear indicator quits altogether, and subsequently so does the cruise control. It can still be turned on, but it will not engage.
    The Harley ECU calculates the gear indication by comparing rpms and MPH at the same time. There is no mechanical gear indicator switch in this model. Lowering the gearing of the bike increased rpms and indicated speed at the same rate - thus no issue.
    When I use the Speedo healer, the ratio of speed and rpm inputs change, thus throwing off the ECU from trying to do it's job of calculating the gear we are in. NOW, if I calibrate the SH back down to 3% everything actually works as it should, but I am trying to get much more than 3% correction. In fact, even at 3%, it is a little sketchy in 6th gear. At 2.5% everything is 100% dependable.
    I believe the bike is also getting some sort of "speed" inputs from both the front and rear ABS sensors. This info all goes to the ABS computer, but it too talks to the bikes ECU. My thinking is that changing the VSS input to the ECU is giving a signal that is not close enough to that received by the ABS computer. Although this does not throw a code or flash the ABS lights or disable the bike, I think it is just enough to make the ECU give up on the gear indicator and cruise control.
    I am of the understanding that your PV can be easily used to adjust the VSS input in the ECU - particularly handy when changing final drive ratios on a Harley. My real query is this...... can the PV be used to make calibration adjustments to + or - 20%??  And, in doing so will these adjustments disable my factory gear indicator and cruise control?
    I am thinking possibly that if the VSS "target" figure in the ECU is changed(accessible with the PV), it may relate correctly to the ABS computer input and not cause the dramas that I am having. If you can deadset confirm this, with examples of such settings on similar bikes, I would strongly consider purchasing one of your PV tuners, or a Second license for the tuner that my mate already has.(if that is still an option)
    In reading your product info, I also see that the PV collects and saves the tune that is currently in the ECU. This would add particular value, as I already have a precise dyno tune in my ECU and it works quite well and I am not keen to start over as I have made no changes in the motor.
    I look forward to your expert advise.
    Cheers
    Mike
  • brash
    brash
    3 years ago

    can confirm VSS on PV can be varied wildly. Sorted out a LowRider with a chain conversion that was stupidly geared (17% shorter) but none the less worked out the new ratio as a percentage of the original gearing, entered in the new value for VSS and bobs your uncle was within 1kph of garmin gps mounted to the bars.

    Gear Position worked correct from what I remember. Didn't throw any codes.

    The healtech is intercepting the signal and feeding info to the ecm as you no doubt know, that's maybe where the issue lies where the parameters are outside what the ECM would call a logical input. When altered inside the ECM you are changing the pulses per Km.

  • paulybronco
    paulybronco
    3 years ago
    Sorry guys sitting in the airport on way to vietnam so missed the conversation......thanks to all for the answers. I have not played with that feature myself but have seen the settings
  • Onequickpuck
    Onequickpuck
    3 years ago

    Thanks for the input guys!


    Pretty much what I suspected. Dynojet came back with a less detailed but affirmative response.

    A mate of mine has one of these. I'm gonna check to see what a "Dual" license will cost, as opposed to buying a whole unit.



  • brash
    brash
    3 years ago

    $199 USD for a licence.




  • Onequickpuck
    Onequickpuck
    3 years ago

    thanks Brash!


    Where's that at?

    I checked Serco already. A bit more dear.

  • brash
    brash
    3 years ago
    Fuel Moto, They have a great guide on how to install the new licence too.
  • Onequickpuck
    Onequickpuck
    3 years ago

    Cool! Thanks mate!


    and no additional shipping charges :)  LOL


    Thinking about getting the PV anyway, for potential future use.....

  • Dandeniro
    Dandeniro
    3 years ago
    What is the speedo healer harness p/n? 
    I just bought one for my 17 breakout but they dont know which one to send me... i cant send them a pic of the plug because I cant find where it plugs in either lol. Where did you plug it in?

  • bodgie1307
    bodgie1307
    19 days ago
    hey onequickpuck

    can you confirm that a vss change with PV the shift indicator works ?  i used a dakota speed cal module and my indicator displays incorrectly. No abs issues.

    Bodgie