Contour Enthusiasts Group Archives Forums Modifications Forced Induction Lightning MAF size

The stock MAFs with a centerbar are so much more efficient at sampling the airflow in low flow ranges than the longitudinal tubes like the pro-m MAFs use. They also give a very consistent curve shape so the stock pcm can adjust in the AF better.

The 80mm lightning MAFs I have seen only have a half center post in them, meaning it doesn't have any post in the bottom half and more open cross sectional area. I don't know how that affects Demons calculations, but I will say that in my opinion it is no big deal to have one. The MAFs are flow tested to a certain CFM rating with laminar flow, that is No turbulence. As long as your MAF is flowing air within its designed range then there won't be any restriction issues. Cross section is only a small indicator of the flow capability of a MAF since the shape of the post and/or sampling tube, the funnel entrance and the exit of the MAF are all designed to flow their max.
The electronics will max out at 5 volts before the flow goes turbulent and restrictive ANYWAY, so worry more about the sensors voltage range than anything else...i.e. horsepower estimates. An efficient engine will produce more power on the same air and fuel than a non efficient motor, so rating a MAF with HP figures is wrong.