If you get no help with a post, you can always 'bump' the post back to the top of the page. Around here, your dealing with like 12 different time zones of people who visit the tuning forum. There is no 'best' time of the day to get responses, you just have to try to hang in there.
There's usually rules as to how often you can bump a post also, you'll have to read up on the forum rules for that, but it's a lot better then making a new post, lol.