What is better, MAF or Speed Density (MAP)?
They each have their advantages and disadvantages over the other. Which one will suit your needs better depends on your specific application. Both have the potential to work equally well on stock engines, as well as on modified engines. However, MAP is much more sensitive to engine modifications (particularly cam and head changes). A heavily modified engine with a MAP system will not run well on a stock tune, but can run flawlessly with the proper tuning. A MAF setup on the other hand can run very well on a stock tune even with a heavily modified engine. There are gains with prom tuning, but it is not as critical as the MAP system. Parts are readily available for both, but there is a difference in cost for sensors between the two. A MAF sensor is significantly more expensive than a MAP sensor.
