Well, I dont know about the 1/4, but try to figure out the speed you should hit in the 1/4, while having good acceleration all the way. I only do the full tunnel, and i can say that it works good if you set your gears so you will have a close geared transmission = you dont loose rpm while shifting gears. I set my transmission so i only losing 1000 rpm while shift. In this case you get a simulation of an automatic transmission even if you are driving manual.