5 blade vs 11 blade 911 fan

[Tony Z]

I looked into this about 4 years ago, so I cant remember the actual figures.

A fans efficiency is rated in how much "air power" it produces to the amount of mechanical power used.

If I get the time over the next week I will look it up again and let you know. But I do remember that the porsche fan had at least 30% better efficiency than the stock T1 setup.

Also, even though certain fans are less efficient than oters, they work better in certain applications.