Is this filter really the highflow filter that actually filters or is it just a gimmic. Does it really significantly better than my K&N?

Unknown, but I am using the VOLANT system. See it installed on my truck by clicking of the link below in my signature.


LATER!

Is this filter really the highflow filter that actually filters or is it just a gimmic. Does it really significantly better than my K&N?I just installed and MBRP exhaust, and a few days later An AFE ProGuard 7 on my 2004.5 LLY. The exhaust made more of a difference but the ProGuard 7 stepped it up another notch imho. Part of the difference is hearing the turbo more but not much more. It does spool up faster. I was previously running a K&N in the stock box. If you are planning to create considerable extra zoom it's a good idea. Lastly I can't see any sky when I look through the proGuard 7.

JhnZ71,

The same size filter to filter comparision the K&N will flow more air, and more dirt too! The Pro Guard 7 is designed to flow more air but also stop the dirt, check this site there was a very indepth test done here, the PG 7 won over all the washable filters for dirt stopping performance, almost as well as a paper filter in fact if I rememebr it was within 1/2 of 1% of paper filters.

Now if you add the PG7 Stage II intake system vs a K&N drop in filter the PG7 will out flow it by a considerable margin. Call us if you have any questions or visit www.proguard7.com

Mark @ DPPI

yeah, i have a k&n intake already. I was wondering if i could just buy the ProGuard 7 filter to just put in the place of the K&N i dont want to have to buy a new intake system unless i have to.

That AFE site lists some actual numbers, so I took a closer look.

Pressure drop (through a restriction like that) increases as the square of volumetric flowrate. So, I can calculate a resistance coefficient based on the data (if you believe them).

DP = alpha * CFM^2

They list the AFE filter at 245 CFM for 1.5 inches of water DP, and the stock filter at 145 for 1.5". This translates to a resistance coefficient of 7.1 e-5 for stock and 2.5 e-5 for their filter. Spicer's air filter site indicates 6.25" for 350 CFM through the stock AC Delco filter. This is equivalent to 5.1 e-5, so AFE's numbers for the stock filter are worse than Spicers by decent margin. Not sure why. Maybe it's the effect of the box and filter vs. just the filter.

A 402 CID engine at 3200 RPM and 20 psi of boost with a VE of 75% draws about 660 CFM (assuming the intercooler cools the air all the way back down). That means the stock box (using AFE's numbers) restricts 31 inches, and the AFE 11 inches. Based on a standard atmosphere (396 inches) that's a 5% improvement.

At max power, the turbo wastegate or VG vanes should be regulating the boost, so the engine sees the same intake pressure. If we assume it does not (best case for AFE), then 5% of 310 HP is about 16 hp. So I'd expect somewhere between 0 and an absolute max of 16 hp gain.

Spool up should be faster since the turbo does not have to accelerate to as high a speed for a given boost...due to the higher suction pressure.

I'd say a few HP is the best you can expect. Whether of not this is worth over $500 is up to you. Somewhere around $50/hp is on the high side.

An $1800 Banks kit making 125 hp, is $14/hp. A $600 programmer making 100 hp is $6/hp.

i feel like im back in physics