Trackmania Nations ESWC
Ring Accelerator (ReUse)
Start with a 3/4 wallride, which you will run it for 3 times(rounds) with 3 different length. First round, your speed isn't enough, so you can only run 1/4 wallride, then accelerate for 2/4. Second round, your speed isn't enough for the whole 3
This track from ceo_tw contains a lot of speed and acceleration.