g`day mate, i am not sure of the lakes allitude, but it would be no more than 100`, if that,,, our speedweek this year runs from march 5th to 9th,, and the weather at this time of year can be very hot and obresive, there are reports that the temperature has been 40+, and as you know these conditions are not condusive to high performance, however a few tuning adjustments can mitigate that a little, also running first up in the morning when the temperature and air is better will also help,,,,