K&N filters...yay or nay? (from a filtration standpoint)

ImportConvert · 02-29-2012, 04:53 PM

Quote:

Originally Posted by Nick911sc

So what's the difference between the Cosworth's and K&N's?

Cosworth is disposale (you have to buy new one's at regular service intervals).

I think K&N flows more than 10% over OEM.

The K&N and Cosworth both claim around 98% (K&N states 96-99% is what their filters normally test, obviously variance exists).

K&N Air Filter Efficiency Testing

Nick911sc · 02-29-2012, 05:07 PM

Quote:

Originally Posted by ImportConvert

Cosworth is disposale (you have to buy new one's at regular service intervals).

I think K&N flows more than 10% over OEM.

The K&N and Cosworth both claim around 98% (K&N states 96-99% is what their filters normally test, obviously variance exists).

K&N Air Filter Efficiency Testing

I understand the literal difference between the two filters. I was wondering more along the lines about those dyno's people have posted with the K&N's.. Could it be assumed that the Cosworth's are going to net the same results?

ImportConvert · 02-29-2012, 05:16 PM

Quote:

Originally Posted by Nick911sc

I understand the literal difference between the two filters. I was wondering more along the lines about those dyno's people have posted with the K&N's.. Could it be assumed that the Cosworth's are going to net the same results?

K&N claims that they enhance flow by 20% or so, based on their panel-filter flow data. Cosworth claims 50% of that. Beyond that...I'm in the dark.

Nick911sc · 02-29-2012, 03:14 PM

So for what it's worth, would you say the Cosworth's + Post MAF Tubes are going to net the same as the K&N + Post MAF's?

sfearl1 · 02-29-2012, 03:18 PM

Quote:

Originally Posted by Nick911sc

So for what it's worth, would you say the Cosworth's + Post MAF Tubes are going to net the same as the K&N + Post MAF's?

i used Cosworth on my Evo X bc it outperformed the K&N's.

that should be a solid setup you have listed there.

Nick911sc · 02-29-2012, 03:28 PM

So what is that telling me compared to the Cosworth's? lol

m4a1mustang · 02-29-2012, 03:30 PM

It's just showing you the number of defects per millions of opportunities given specific filtration rates. If Cosworth is at 98%+ you can see where it'd fit in.

ImportConvert · 02-29-2012, 04:55 PM

Quote:

Originally Posted by m4a1mustang

It's just showing you the number of defects per millions of opportunities given specific filtration rates. If Cosworth is at 98%+ you can see where it'd fit in.

Where did you get this? Is this a table created from the diesel-forums test a while back?

Speedy · 02-29-2012, 03:32 PM

For what it's worth I tested K&N Filters years ago in a Toyota Tacoma vs. stock and AEM dry filters.

The only way I could think to test filtration ability was silicone content in the resulting oil analysis.

After 5,000 miles the K&N filter oil analysis had more silicone than either stock or AEM dry filter.

Tests were in the stock air box in that truck.

Driving conditions were the same in all tests as well.

Having said that, the difference wasn't HUGE at all, but there was a slight difference.

Nick911sc · 02-29-2012, 03:33 PM

So the Cosworth's should perform as well but let less debris through?

Red__Zed · 02-29-2012, 03:35 PM

Quote:

Originally Posted by Nick911sc

So the Cosworth's should perform as well but let less debris through?

You'd need to directly compare flow data, I don't have flow numbers for either.

ZMan8 · 02-29-2012, 03:37 PM

Interesting....

So for engine longevity, would people say its better to just stick to more restrictive (no power gains)

m4a1mustang · 02-29-2012, 03:44 PM

If you ran a K&N filter without oil it'd let everything in just about.

ZMan8 · 02-29-2012, 03:45 PM

you wash them and reoil every 30-50k miles depending on where you live/driving habits etc.

KB2 · 02-29-2012, 04:32 PM

i have the AFE dry flow-s filters...im pretty sure is what they are called.

i dunno how great or terrible they are,but i like them

02-29-2012, 03:30 PM	#7 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6962	It's just showing you the number of defects per millions of opportunities given specific filtration rates. If Cosworth is at 98%+ you can see where it'd fit in. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

02-29-2012, 03:37 PM	#12 (permalink)
ZMan8 A True Z Fanatic Join Date: Oct 2011 Location: Chicago, IL Posts: 5,844 Drives: 10 370z 40th M6 Rep Power: 658	Interesting.... So for engine longevity, would people say its better to just stick to more restrictive (no power gains) __________________ 2010 370Z 40 Anniv., 6 MT \| Fast Intentions \| Swift Springs \| SPC \| Z1Motorsports \| JWM \| Redline Oils \| 35% Window Tint 2015 Mazda6 \| 370ZChicago: Chicago Area Cars & Coffee

02-29-2012, 03:44 PM	#13 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6962	If you ran a K&N filter without oil it'd let everything in just about. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

02-29-2012, 03:45 PM	#14 (permalink)
ZMan8 A True Z Fanatic Join Date: Oct 2011 Location: Chicago, IL Posts: 5,844 Drives: 10 370z 40th M6 Rep Power: 658	you wash them and reoil every 30-50k miles depending on where you live/driving habits etc. __________________ 2010 370Z 40 Anniv., 6 MT \| Fast Intentions \| Swift Springs \| SPC \| Z1Motorsports \| JWM \| Redline Oils \| 35% Window Tint 2015 Mazda6 \| 370ZChicago: Chicago Area Cars & Coffee

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02-29-2012, 03:14 PM	#4 (permalink)
Nick911sc A True Z Fanatic Join Date: Feb 2009 Location: Long Island, New York Posts: 1,698 Drives: 2010 Nissan GT-R Rep Power: 20	So for what it's worth, would you say the Cosworth's + Post MAF Tubes are going to net the same as the K&N + Post MAF's?

02-29-2012, 03:28 PM	#6 (permalink)
Nick911sc A True Z Fanatic Join Date: Feb 2009 Location: Long Island, New York Posts: 1,698 Drives: 2010 Nissan GT-R Rep Power: 20	So what is that telling me compared to the Cosworth's? lol

02-29-2012, 03:32 PM	#9 (permalink)
Speedy Enthusiast Member Join Date: Jan 2012 Location: TN Posts: 390 Drives: check my signature Rep Power: 13	For what it's worth I tested K&N Filters years ago in a Toyota Tacoma vs. stock and AEM dry filters. The only way I could think to test filtration ability was silicone content in the resulting oil analysis. After 5,000 miles the K&N filter oil analysis had more silicone than either stock or AEM dry filter. Tests were in the stock air box in that truck. Driving conditions were the same in all tests as well. Having said that, the difference wasn't HUGE at all, but there was a slight difference.

02-29-2012, 03:33 PM	#10 (permalink)
Nick911sc A True Z Fanatic Join Date: Feb 2009 Location: Long Island, New York Posts: 1,698 Drives: 2010 Nissan GT-R Rep Power: 20	So the Cosworth's should perform as well but let less debris through?

02-29-2012, 04:32 PM	#15 (permalink)
KB2 Base Member Join Date: Apr 2010 Location: Illinois Posts: 243 Drives: 370z Rep Power: 15	i have the AFE dry flow-s filters...im pretty sure is what they are called. i dunno how great or terrible they are,but i like them