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I was really impressed with my Road Machine's accuracy compared to real watts. It did over read (by about 20 watts), but it was pretty consistent along the whole curve. Are you unsure of the accuracy of your vectors?
TTM-
No, they seem to give me numbers that seem reasonable (albeit depressingly low).
I reckon my FTP per TR and per my turbo is about 20-30W different. Although that sounds like a similar result to what you found, I don't have the FTP of Fabian Cancellara like you have, so as a % it's quite a big difference.
jim1985
Out of interest, how accurate was TR's power profile for your trainer compared to the real thing? I know that TR is supposed to be accurate for Kurt turbos, but am pretty sure it over-reads my power on a RocknRoll unfortunately.