Hey, I searched around for this and couldn't find anything. I came across a free Hiper Flow intake filter. I dug around online and all i can find about it is it is made by Hiper Industries. I was wondering if anyone had any knowledge of this brand. Specifically are they good (both from a performance perspective and a filtering perspective).

Some mistakes are too much fun to only make once.

2004 G35 coupe - 4150K high/fogs - more to come

 

Nissan uses the SAE standard to determine the drop in filter restriction........no more than 1.5" water column at redline.
1.5/28=0.0536 x 0.066 = 0.003 % restriction.........that means if the air pressure on the inlet side is 14.700 psi after the filter it is 14.656 psi at max flow max rpm.

Whether 0.003% is significant?

Much more restriction is found in the air box than the filter but still less than or just at 1%.

 

Q, I've been thinking the same thing about the airbox and the CAI madness.

filter doesn't matter much, "cold" air doesn't matter much.

Remove the flow restriction, that's what matters.

More "hot" flow is better than less "cold" flow.

More hot flow in FL (at SL) is better than more cold flow in CO ( at 10,000 ft.)

Within the extremes you encounter in a typical G engine bay anyway.

Thoughts?

2004 G35C 6MT Black. Yes Honey, I promise no mods. I love it just the way it is.

 

Don't forget about humidity. The name of the game is dense air, and altitude, humdity, pressure and heat will all effect your air. What you want to know is, "What is my density altitude". At 80 degrees with a dew point of 70 at 29.92 inches of mercury your density altitude is 1685 ft. At 100 degrees it is 2909 (with same dew point). Change the dew point to 90 and its 3200 feet. So humidity matters quite a bit.

Putting it another way:
At sea level, 29.92 inches of mercury, 80 degrees, 72% humdity you are making 99.5% relative HP to rated. Or at 5000 feet you will make 79.9% HP.

At sea level 100 degrees (all else same) you are making 94.9% relative HP to rated. At 5000 feet it's 75.9% HP.

I know this doesn't really answer your question but if you can simply measure the outside air temp at the filter on a CAI and on a short JWT we can get to the bottom of this very quickly.


2004.5 Coupe/5AT/Ivory/Everything but chin spoiler/Z Tube-Popcharger/Crawford V5 Plenum on the way