You can find the tides here:
www.bom.gov.au/australia/tides/#!/vicThe inlet is about 1-1.5 hrs behind this - with a storm surge, it can be 2-2.5 hours.
You can speedsail the SW bank at just about any tide, excluding storm surges which break over the spit - however, the channel doesn't start forming until about .75 tide -> its best at about .25 tide and lower, ie: low-tide allows you to sail within about 2 metres of the bank.
The east-bank is good from about .5 tide and lower. The NW bank is good from about .3 and lower - but water depth is not consistent over the length of the run -> you get to touch bottom if you are a local...
Outgoing tide is smoother than incoming tide (although, everyone wants to sail on outgoing making incoming sometimes better...) - on the SW, the long-wavelength standing waves are smaller on outgoing; on the East-bank, incoming means sailing through up to 1m surf, before getting to the speed run, then finally running into some ferocious short-sharp chop.
You can park your car on the beach until about .9 on a high-high tide - any higher, then you will be driving through salt water, or waiting for it to recede (dont test the height when there is a storm surge...!). The small-high tide is usually safe from car drowning. The rule is, if you see the regulars move their cars, you probably should too...
