My C55 dyno results - stock filters vs. K&N's - Page 2

Apr 23, 2008 | 04:48 PM

#26

SFML320

Member

Joined: Apr 2003

Posts: 212

Likes: 0

From: Bay Area, CA

2015 GL550, 2019 GLC350e

Quote:

Originally Posted by hooleyboy

the best thing about K&N filters are you don't have to buy a filter ever again just keep it clean and oiled correctly. over time they will pay for themselves. For me going to aftermarket lifetime filters was a no-brainer any HP gains are just gravy. K&N has been around for a long long time and to stay in the game that long you have to have a good product. go to your local auto zone or parts store and get some k&n filters (you need to buy two) you wont regret it aftermarket filters are a big upgrade over stock.

I just place an order! I noticed the dealers don't even bother checking on the air filters anymore. At 50K miles, you would think someone would think hey, let's make a buck on this fellow by telling him to replace them but after 2 A Service and 1 B Service, not even one comment.

Now the interesting part will be for me to see what condition my filters are in when I open it up to replace it with the K&Ns.

Apr 23, 2008 | 05:08 PM

#27

splinter

Super Moderator

Joined: Jul 2006

Posts: 3,365

Likes: 12

From: Orange County, CA

GMC - Miata - Trek - P-Car

Quote:

Originally Posted by SFML320

...Now the interesting part will be for me to see what condition my filters are in when I open it up to replace...

You may find some debris in there…

https://mbworld.org/forums/showpost....53&postcount=1

https://mbworld.org/forums/showpost....1&postcount=24

Apr 23, 2008 | 06:38 PM

#28

None

Member

Joined: Jul 2005

Posts: 88

Likes: 0

From: Marietta GA.

Jaguar STR

I did the same test with the green filters. New mb filters made a hit let it cool then greens picked up 7.8 rwhp.

Apr 29, 2008 | 03:57 PM

#29

SFML320

Member

Joined: Apr 2003

Posts: 212

Likes: 0

From: Bay Area, CA

2015 GL550, 2019 GLC350e

Quote:

Originally Posted by splinter

You may find some debris in there…

https://mbworld.org/forums/showpost....53&postcount=1

https://mbworld.org/forums/showpost....1&postcount=24

Fortunately my filters were not as clogged, as a matter of fact they were relatively debris free except for the corner nearest to the engine air inlet.

Here's what I've noticed so far:

MPG increased from 20.8 to 21.3 from my daily commute of 53 miles (avg speed of 50 mph)
Less kick down from the transmission. Lately I've been noticing that the transmission needs to kick down to a lower gear as I'm not getting the same quick response from the engine (happened right around 50K miles)
A tiny bit louder but it could be my imagination

Overall not bad for a $100 investment

Apr 29, 2008 | 04:08 PM

#30

ProjectC55

MBWorld Fanatic!

Joined: Feb 2004

Posts: 5,475

Likes: 5

From: City with Tall buildings!

C43/55,2k11 Volvo S60 T6AWD,2k Audi B5 S4,95 Eagle Talon Tsi AWD 500+awhp

Quote:

Originally Posted by MarcusF

That might be the case if the dyno shop uses a WalMart box fan. With the hood open and a real fan, the engine is ingesting room temperature air, not engine compartment air. The first photo is a picture of a CLK430 that SoCalCLK used to own - note the fan.

Cars that run boost generate so much heat that 20,000+ CFM fans are required. Regardless of the airbox, a dyno shop should have a fan capable of proper airflow. Without it, the car will run hot and the dyno numbers come in low.