Calibration still off

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Biff
Posts: 57
Joined: Mon May 28, 2018 8:30 pm

Calibration still off

Post by Biff »

Hi John,
I originally did a cal ride last year, then had you review and you tweaked it for me around sept. This April I updated the config with new accurate weights of me and my gear but I've been noticing that my power is being reported about 50 watts higher than it should be. The windier and more oblique the angle, the higher the discrepancy seems to be. It also seems that the more power I generate, the bigger the discrepancy i.e. 200ish watts reports as 230-240, 300 watts repots as 375-390.
This is obviously in general terms- I base this all on the last 5000 miles of indoor Zwifting on a Tacx Neo since November. I'm pretty used to the feel of wattage at various levels.
This ride I'm attaching from yesterday was an easy ride, I only exerted a bit when I turned south and caught the tailwind. The power reported is too high for the feel and for the heart rate.
Can you please take a look? Should I scrap it all and do a new fresh calibration ride? I thought it was always doing that automatically within 90 seconds or so of starting out...
Thanks,

Biff
Attachments
iBike_05_12_2021_1552_39_Miles.ibr
(349.74 KiB) Downloaded 118 times
Biff
Posts: 57
Joined: Mon May 28, 2018 8:30 pm

Re: Calibration still off

Post by Biff »

Almost forgot, one more question:
I have the pitot tube- what are the ramifications of removing that? does it affect the PP? Can I add and remove it at will without affecting the PP?
Biff
Posts: 57
Joined: Mon May 28, 2018 8:30 pm

Re: Calibration still off

Post by Biff »

bump
Velocomp
Velocomp CEO
Posts: 7793
Joined: Fri Jan 11, 2008 8:43 am

Re: Calibration still off

Post by Velocomp »

Your wind calibration is off--too much headwind.

I corrected it using the "Check Calibration" command. This is a bit risky because this isn't a true out and back...

If you remove the pitot tube you will need to do a new cal ride.
Attachments
Biff_Corr_05_12_2021_1552_39_Miles.ibr
(515.81 KiB) Downloaded 123 times
UntitleBiff_Corr.ibp
(744 Bytes) Downloaded 115 times
John Hamann
Biff
Posts: 57
Joined: Mon May 28, 2018 8:30 pm

Re: Calibration still off

Post by Biff »

Thankyou John.
Biff
Posts: 57
Joined: Mon May 28, 2018 8:30 pm

Re: Calibration still off

Post by Biff »

John-

The profile won't load. It errors out and says -3.129 friction value is no good.
Velocomp
Velocomp CEO
Posts: 7793
Joined: Fri Jan 11, 2008 8:43 am

Re: Calibration still off

Post by Velocomp »

Try this
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Biff_corr.ibp
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John Hamann
Biff
Posts: 57
Joined: Mon May 28, 2018 8:30 pm

Re: Calibration still off

Post by Biff »

thanks
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