When I drift a hairpin... i usually come up to the turn fast, and jab the breaks and preform a breaking drift , that way I can speed up on my exit, helps when racing people ^^. Its kinda important to be sideways before u enter the turn for hairpins because they are so sharp you really don't have time to start going sideways during the turn. If your using sim tires... you should be drifting at around...30-40, normal tires u can do around 40-50. Id say u should be in 2nd gear but of course thats dependent on your gear ratio. I hope this helps