Takes 5-8 seconds for power data to display/record from a Quark from a dead stop

cycleanalyze

Hi

Have a new Quark powermeter, spider based, from a Force group.

1050 is on firmware 30.18

From a dead stop, the first 5-6 seconds of pedaling show no power data. 0W then you're going again.

Looking in the .fit file second by second, there's no data being written. Same for cadence.

I asked a friend if his is doing the same thing, and the answer is yes

Speed is increasing.

NO autopause

No 3-5 second smoothing etc

The data is not getting from the Quark to the head unit.

I contacted SRAM, they said they've never heard of this, talk to Garmin

Can anyone with a Quark and a 1050 running 30.18 ride their bike. Come to a full stop like at a light, and pay attention to the 1s watts display as you get going?

Chart here is just an example. Columns are time/watts/heart rate/cadence/speed

  • 0

    power sensor via BT or ANT+? 

    "I asked a friend if his is doing the same thing, and the answer is yes" has he same Quarq and a x50 Garmin? 

    but try to remove all sensor pairings from Edge, turn off completely (so full off state, not suspend mode) , turn on, re-pair everything, Quarq via ANT+ only, and re-try

  • 0

    but i think the cadence is very low, and this is why there is no watts (and cad), i dont know what is the exact operation range of the Quarq, but usually 30-220rpm , some powermeters from 20rpm. so probably this is the problem, try to stop with the easiest gear (so small ring front-biggest rear combo) and start with that.

    And you can check this when coasting with higher speed, stop your legs , then the cad is zero but the speed is 40-50-60km/h, then spin again , and watch the display, how much secs does it need to show cad and watts, similar as at stop, or much quicker.

  • 0

    i searched a data from my yesterday ride (started with 50-11 from 0kmh), ok, it is a better Power2Max NG and not a Quarq, but spider-based and that is showing watts later also than the Assioma Pro RS2, look the graph: (purple Assioma PRO RS2, lightblue NG)

    below 30rpm the NG is not showing power just cad for 5-6secs apprx (1sec offset issue between power and cad), the Assioma is immediately. probably the Quarq is not showing both below a threshold cadence value  

    with matching cad timestamps:



    with matching power timestamps : 

  • 0 in reply to Luko79

    You might be on to something. Thank you for looking at your system and noting/documenting the behavior.

    Did all that stuff removing the pairing, added it back. Tried ANT+ and then BT just to eliminate a variable.

    When coasting and no cadence, it behaves differently, see attached screenshot. At least when coasting the cadence is a zero. When stopped the cadence is not zero, it is blank.

    I think there is some kind of sleep initiated when there is zero speed and zero cadence, and it takes a few seconds to come out of the sleep.

  • 0 in reply to cycleanalyze

    usually the sleep time 120secs in powermeter (but in Assioma Pro 300secs and it is configurable), i think it is similar in Quarq too. was it a longer stop? i am rotating backward the cranks if i dont wanna to go in sleep mode (the 2mins for P2Ms is the default, ok, i can modify this value because i have special rights to the firmware just i still didnt do it , 5mins is enough for every red lights i think, when i stop for a coffee stop, then before i start, i rotate it backwards to wake up and just after go, the Assioma needs apprx 15secs to report data after sleep mode wake up, the P2M and Quarq need much less, 5-6secs maximum, so i need to wait 15secs minimum and just after start to pedal and ride)

  • 0 in reply to Luko79

    No any stop does this. Rotating the cranks and even spinning the wheel doesn’t make a difference 

  • 0 in reply to Luko79

    This is what SRAM rider support had to say about it 

    Thank you for contacting rider support. I'm sorry to hear that you are having trouble with your power meter!
     
    To be honest, I'm not sure what would be the cause of this type of issue. Usually issues like this occur when riders connect ot cycling computers via Bluetooth, but if you are getting the same issue with ANT+, this may be different. 
     
    In theory, if the power meter has a good battery connection, gets a green LED, pairs via ANT+, and has a good zero offset number, then the power meter should be working without any issues. The power meter continuously broadcasts power and cadence data after waking, so any delay is likely caused by the cycling computer.