Larger wheels, rims or tires do not usually make a car any faster. Normally, smaller wheels yield a quicker acceleration because they weigh less and produce less friction.
There are rare circumstances under which having wider tires actually helps speed. If an engine has been upgraded with parts to provide more power, the use of wider tire-to-road contact patches can reduce 0 to 60 time and help with lateral grip. Many people add larger tires simply for aesthetic appeal. However, in general, in order to get the maximum performance from a road car, it is highly recommended to stick to the size of tire that the car was designed to use.