Weekly postings are fine. Why don't you think they are lol?
A common turn off for a reader (at least what I think) is a chapter after chapter after chapter after chapter post, and I mean that as you post one hour, wait another hour, then post your next one. Two or three chapters in a row is fine, but going five+ is pushing it. Give your reader a break and time to digest what you have written.
If you already have a good number of chapters written, I suggest posting two or three times a week with a few day intervals in between (like post on Monday then post your next chapter on Wednesday or Thursday). If you only have five or so chapters, I'd go with one or two posts a week. Not only are you not overwhelming your audience, but this also gives you a chance to have new chapters out when you have run out of old chapters to post.
Yeah, I know. If you do get feedback, you do want to post your next chapter straight away. Be patient, young grasshopper. :P