teebone said:Is 280W realistic?
There is no good answer to your question. Anybody who says otherwise is trying to sell you something. Lots of people have started at 240W, and ended at 280W. Some have even done it in a single season. It so happened I went from ~250W (estimated) at the end of 2005 to about 280W in October 2006, which felt like about all that was possible to achieve in that time frame.
But that was me. You don't have my genes, or my time to train, my motivation, my training history, etc., and I don't have yours. All training is an experiment with N=1 subjects; there is no way of knowing what the outcome of that experiment will be ahead of time. There are sedentary individuals out there who simply don't respond to endurance training! It's hard for us to imagine, but studies that put untrained folks on supervised endurance training programs always find a few percent who simply don't improve. On the other hand, we all know athletes whose bodies seem to react to training immediately and vigorously. You don't know where you are on that spectrum of training response.
Even the good responders eventually reach their genetic limits. One of the hardest parts psychologically about training is that we don't really know when we've hit our ceiling; even if you've already hit it, the only way to be sure you've hit it is to assume you haven't.
As Tim Noakes put it, "All training plans are essentially bogus, in that they presume the result of an experiment before that experiment is conducted." Train to improve; don't presume to know how big that improvement will be, or on what time course the improvement will come. Don't get me wrong; I still use goals like, "under 20 minutes up the local climb," or "X w/kg over Y minutes", or whatever, to help me stay motivated and remind myself why I'm training. But I know there's a chance I won't hit those goals this season, or indeed, ever.
Realistically, most riders who go from 'just riding around' to focused training with a power meter make blockbuster gains in the FTP department in the first season of focused training. "Blockbuster" will vary from individual to individual, though. There are folks that could take that 240 number up to 300, while others may struggle to get it up to 260, in a single season. Take comfort in the fact that it will probably take years to reach your potential, and that the training is doing what it's supposed to be doing, regardless of how fast or slow it's going about it...