Some car builders avoid turbo lag (below) by using two small turbos. The normal setup is to have one turbo working all the time. The seconds turbo will only start working at higher RPM. Because the turbos are smaller, they do not have as much turbo lag. The second turbo will be able get to full speed before it is required. This setup is normally called a sequential twin-turbo. Porsche first used this technology in 1985 in the Porsche 959.