M275 Air box design
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Super Member
Joined: Mar 2010
Posts: 643
Likes: 72
From: London UK
2013 W204 C63 AMG, 2008 W221 S65 AMG
M275 Air box design
Hi all
Its obvious that the design of the airboxes is restrictive.
Is there any power benefit to replacing the stock filters with less restrictive filters inside the stock airbox?
Its obvious that the design of the airboxes is restrictive.
Is there any power benefit to replacing the stock filters with less restrictive filters inside the stock airbox?
MBWorld Fanatic!
Joined: Aug 2013
Posts: 1,077
Likes: 80
From: Anchorage
05 CL65
I run a custom CAI I made at the track with no filters. It made about 40 RWHP on the dyno. I thought you meant something like putting a K&N in the stock boxes. When you remove the stock air boxes, take the MAP sensors out of the housings and plug them in to the harness or you will not get full power.
MBWorld Fanatic!
Joined: Nov 2010
Posts: 2,605
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From: Welwyn, Herts, UK
2006 S600
Part of the problem with the V12TT air-boxes is that manufacturers simply HAVE to have the air flowing sideways or upwards through the filter. They can't permit the air to flow downwards, because of the risk of debris falling into the intake. It's the same for ALL manufacturers, and I think it's a major cause of the V12's restricted intake.
I really wish MB had put some of the reservoirs in the cavities behind the front wheels, and allowed space for the filters behind the headlights instead.
Nick
I really wish MB had put some of the reservoirs in the cavities behind the front wheels, and allowed space for the filters behind the headlights instead.
Nick
Newbie
Joined: Dec 2022
Posts: 6
Likes: 2
From: Brooksville Florida
2005 Mercedes sl65 amg
I run a custom CAI I made at the track with no filters. It made about 40 RWHP on the dyno. I thought you meant something like putting a K&N in the stock boxes. When you remove the stock air boxes, take the MAP sensors out of the housings and plug them in to the harness or you will not get full power.
thanks and Merry Christmas
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Junior Member
Joined: Jul 2018
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09 SL65
Hope that helps!
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Newbie
Joined: Dec 2022
Posts: 6
Likes: 2
From: Brooksville Florida
2005 Mercedes sl65 amg
Correct. If you remove the factory airboxes and replace them with custom piping, you will have to disconnect a MAP sensor in each airbox to remove them. You'll then need to remove those sensors (I believe they're held in by a couple torx screws) then plug them back in to the harness you disconnected when you removed the stock airboxes. You can leave the sensor open to the elements in the engine bay -just tuck them up and zip tie them down to prevent movement. Hope that helps!
MBWorld Fanatic!
Joined: Feb 2012
Posts: 2,608
Likes: 1,208
From: Phoenix
222 S-65
Has anyone taken this on?
It got K&N filters for the stock airboxes. No plugged air filter codes but....
I have a 279 powered S-65. I intend to copy what Brabus has done with charge cooling and will have to address the obviously restrictive air filter box arrangement as where they live currently will have another charge cooler on each bank of cylinders. Air from in front of the stack of heat exchangers is a given. Hoping someone else has already cooked up a solution.
It got K&N filters for the stock airboxes. No plugged air filter codes but....
I have a 279 powered S-65. I intend to copy what Brabus has done with charge cooling and will have to address the obviously restrictive air filter box arrangement as where they live currently will have another charge cooler on each bank of cylinders. Air from in front of the stack of heat exchangers is a given. Hoping someone else has already cooked up a solution.
Senior Member
Joined: Feb 2014
Posts: 268
Likes: 47
From: DFW
2006 C55
I just ran the Texas Mile with my 2013 CL65. My OEM air filters had a few thousand miles on them.
I made runs with the air filters then took them out, cleaned the boxes, and made more runs.
Over a standing mile running wide open for 30 seconds I saw exactly zero change. Really surprising. 5 runs all within 169.6 and 170.1 mph.
I expected to see an improvement.
I later tried manually shifting a bit early to get deeper into the torque but the car slowed down.
I made runs with the air filters then took them out, cleaned the boxes, and made more runs.
Over a standing mile running wide open for 30 seconds I saw exactly zero change. Really surprising. 5 runs all within 169.6 and 170.1 mph.
I expected to see an improvement.
I later tried manually shifting a bit early to get deeper into the torque but the car slowed down.
MBWorld Fanatic!
Joined: Feb 2012
Posts: 2,608
Likes: 1,208
From: Phoenix
222 S-65
I just ran the Texas Mile with my 2013 CL65. My OEM air filters had a few thousand miles on them.
I made runs with the air filters then took them out, cleaned the boxes, and made more runs.
Over a standing mile running wide open for 30 seconds I saw exactly zero change. Really surprising. 5 runs all within 169.6 and 170.1 mph.
I expected to see an improvement.
I later tried manually shifting a bit early to get deeper into the torque but the car slowed down.
I made runs with the air filters then took them out, cleaned the boxes, and made more runs.
Over a standing mile running wide open for 30 seconds I saw exactly zero change. Really surprising. 5 runs all within 169.6 and 170.1 mph.
I expected to see an improvement.
I later tried manually shifting a bit early to get deeper into the torque but the car slowed down.
Did you do any data logging during your runs?
What was ambient temperature?
Here in the Phoenix area I see a large loss of performance as ambient gets over 80 degrees.
During what passes for ‘winter’ here in the valley of the sun ambient can be as low as mid forties. She is dramatically more exciting then.
