Honestly ....you could have Quicksilver healthy, and the Flash in a wheelchair ....and the Flash would win.
You could have Quicksilver healthy, and the Flash with a broken leg, and the Flash would win.
You could have Quicksilver healthy, and the Flash lying on the floor with 2 broken legs and one broken arm, and the Flash would win.
You could have Quicksilver healthy, and tell the Flash that the only way he would win would be for him to evacuate a city of 532,000 people in 0.00001 MICROSECONDS (and do this while the city is being vaporized in a nuclear blast), and even then the Flash would win.
The Flash is simply beyond Quicksilver in every imaginable manner.
BTW: The whole 532,000 people in a city thing was from JLA: Trial by Fire, where the Flash evacuated 532,000 people in the span of 0.00001 microseconds. He got the people out 2 - 3 at a time.
Now that is speed.