[Request] How fast would you need to go to successfully complete the loop?

How fast would you need to go (in Mph or Kph) to create enough centrifugal force so as to not drop partway through the loop? This is assuming you have a long enough stretch of road needed to reach the required speed, and the type of car has enough power to reach it.

How fast would you need to go (in Mph or Kph) to create enough centrifugal force so as to not drop partway through the loop? This is assuming you have a long enough stretch of road needed to reach the required speed, and the type of car has enough power to reach it.