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Resistance issue can't get > 350W

pieroleouf65
over 4 years ago

Hi Flux 2 users

My Tacx flux 2 smart (purchased on march 2020) seems to have a default in the applied resistance level.

Indeed, in ERG mode in zwift and tacx training app, it is impossible to reach a target power> 350W (except some 2000W spike) despite 90-100 RPM (using 48x13 gear). The HT is supposed to generate up to 2000W.

The resistance seems to work correctly on target powers below 230-250W

The HT has the latest firmware version (3.3.40 / 1.1.6). It is connected via bluetooth to an ipad pro. I observed same behavior with laptop and the tacx ant + dongle. I have also performed the HT calibration several times via the Tacx utility application.

Is anyone having the same problem ? Any idea ?

I contacted garmin tech center twice but no answer after 15 days......

Thank you !

  • 0 over 4 years ago

    Hi there! Did you get a response? I have the same problem, doesn't go above ~340W even with a 52-11 gear. 

    Hmm, also bought on March 2020. 

  • 0 over 4 years ago in reply to FlorinV

    Hi, no answer from garmin tech support.

    I'll try to call them

  • 0 over 4 years ago

    - Likely you are running into what is outlined in the section 'Slope, video, virtual reality, and GPS' of this FAQ: FLUX Series Smart Trainer Features

  • 0 over 4 years ago in reply to Garmin-Matthew

    Hi, I weigh 67 kg and in SIM mode on tacx training app, I really don't feel that the Flux 2 is applying the good resistance level given the incline. And in ERG mode, can't reach power > 350W no matter what I do

  • 0 over 4 years ago

    Dear pieroleouf65,

    As a suggestion to localize any problem;

    Have you tried to use the Tacx software directly (using the mobile/of desktop) set to a desired resistance by yourselves?
    e.g. In my case I "programmed" trainings either by % relative to FTP or exact Watts (power mode), aiming for training resistances suiting my desires:
    e.g. intervals of 5x15"@500 watts with lesser resistance in between.

    (I had lots of issues (look up on this forum), I even had my (March) Flux 2 replaced by Garmin to a new 2.1 (August) version.
    Nevertheless my experiences so far are:
    1. With the most recent firmware, the Flux 2 resistance (graph) fluctuates a lot (despite same cadanse/cogs uses/perceived pedal force applied). The replacement of the Flux 2 unit didn't make any difference.
    2. My Garmin 945 watch conflicted with the steering by the simulation software (Tacx app, swift etc), especially with the "smart trainer" profile on the watch, despite "free ride" mode.
    3. Previously I had the experience that it made a difference how and what I connected to with/simultaneously and in what order (BT/ANT+ and TacxApp/Trainerprogram/garmin device), now I have settled on a way of working with reasonable stable results except for point (1).
    4. Relatively slow reaction of trainer resistance to changed resistance by steering software in FTP and Power mode of the Tacx software.
    5. Poor communication by Tacx/Garmin
    6. I now even dare to stop pedaling to switch the ventilator higher or open a window :) without the fear of loosing the session.
    7. All in all still happy with Garmin/Tacx)

  • 0 over 4 years ago in reply to MarcVSNL

    Dear Marc VSNL

    Thank you for your help and suggestions.

    As suggested, I tried today to manually set power (500W) on tacx training app. Unfortunately, it doesn't seem to work (see attached screenshot). 



    I tried to remove all interference sources (ant+ devices such as cadence sensor), even try to use laptop running zwift with tacx ant+ dongle instead of my ipad and the BLE connection with no luck...

  • 0 over 4 years ago in reply to pieroleouf65

    is the behaviour shown here by to be considered as you label as "Likely you are running into what is outlined in the section 'Slope, video, virtual reality, and GPS'"?

    He is using the Tacx App with a set resistance (500W) and the Tacx 2 doesn't seem to follow....

    (The only occasion I had this was when another device was overruling the Tacx app in steering the Flux 2, in my case the Garmin F945)