The SSyl 's Turbo Super Charger (A20) is a mod - specifically for 7 Days to Die - that is programmed to augment vehicle speed two times its default - or in-game - value. The in-game value, at present, of the Super Charger should raise speed by 25 percent, with an additional speed booster of 15 percent. In reality, these numbers translate to an underwhelming experience in gameplay, as they do not really make vehicles feel dramatically faster.

This mod, in particular, is here to take care of that... it amplifies the values so much further so that vehicle speed is shot to 50 percent, while the booster is raised to 30 percent.

There's more -

You have the option to modify these values yourself, change them to whatever number you desire.