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25-03.-2005, 05:44 AM
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#1 |
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Registered User
Join Date: Jul 2003
Location: Devon
Posts: 70
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Powertap Pro test
My Powertap Pro misreads Watts (by about a factor of 2x) but is fine on everything else. I have zeroed the Torque with no joy. I also ran the test and got the following reading for the Torque information of 497 on the bottom line and 497 on the middle line with 0 at the top. When I rotate the cranks the bottom line minus the middle equals the top as it is meant to do. Totally flummoxed
 , any ideas gratefully receivedThanks Sean
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25-03.-2005, 07:11 AM
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#2 | |
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Registered User
Join Date: Jan 2004
Location: Pittsburgh, USA
Posts: 189
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Re: Powertap Pro test
Quote:
Hi Sean, I replied to you over at Wattage already, but it sounds exactly like my problem last year with a new Pro. I had to send it back for a new torque tube. Do a stomp test and if it's off, it'll probably need to go back. Jimmy |
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25-03.-2005, 08:15 AM
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#3 | |
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Registered User
Join Date: Jul 2003
Location: Devon
Posts: 70
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Re: Powertap Pro test
Quote:
Jimmy, thanks a lot. I have heard about a stomp test but how do you actually do it? An url to a webpage explaining would be great  Cheers Sean
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25-03.-2005, 02:26 PM
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#4 | |
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Registered User
Join Date: Jan 2004
Location: Pittsburgh, USA
Posts: 189
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Re: Powertap Pro test
Quote:
Sean, Check out this link(Q #23): http://www.midweekclub.ca/powerFAQ.htm#Q23 Jimmy |
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25-03.-2005, 11:28 PM
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#5 | |
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Registered User
Join Date: Jul 2003
Location: Devon
Posts: 70
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Re: Powertap Pro test
Quote:
Once again thanks Jimmy . I carried out the stomp test, hopefully correctly, I tried two different cogs and got figures of -67.5% and -71.2%. Does this sound correct and what does it mean except I guess it is meant to be zero  Sean
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26-03.-2005, 02:09 AM
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#6 | |
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Registered User
Join Date: Jan 2004
Location: Pittsburgh, USA
Posts: 189
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Re: Powertap Pro test
Quote:
Oh yes, Sean....if the error's that high, you've got a bad torque tube. Call Graber and let them know. The error should be close to zero, probably no more than a couple percent. The good news is that I think they have parts for the Pro, as opposed to the SL. Ciao, Jimmy |
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30-03.-2005, 08:06 AM
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#7 | |
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Registered User
Join Date: Jan 2005
Posts: 24
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Re: Powertap Pro test
Quote:
Just plan for significant down time. I just had my torque tube replaced and Graber had my wheel for a month. |
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01-06.-2005, 05:47 AM
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#8 | |
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Registered User
Join Date: Jul 2003
Location: Devon
Posts: 70
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Re: Powertap Pro test
Quote:
Jimmy, it's back and I've had the wheel rebuilt and I have now tested it. Wow, it works, it reads power and I haven't been so happy in ages (yes I live a seriously sad life). I shall give it it's first outing on the club TT tomorrow night and can hardly wait It has already made me feel better because I now have a more realistic reading on the turbo (Taxc Excel), I always thought it under read but couldn't know by how much but after a quick spin I'm guessing 300W Powertap is about 250W Taxc. Thanks for all your help Sean
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