alexanderfoti

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?

Dr Matt

I don't think it could hurt. I did it, but no before/after track passes or dyno numbers. Butt dyno says no obvious change though.

alexanderfoti

I have a dyno run booked tomorrow. Will try a run without filters to see what happens.

Dr Matt

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.

alexanderfoti

Thanks. I did mean replacing the panel filters, but 40whp is a lot of restriction!! That is more than I would have thought.

Welwynnick

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

DiMarko

​​​​​​​I know it's old post but wanna ask what you mean by "plug them into the harness"? Just leave MAP sensors outside the box? It will not throw some code or restrict power?
​​​​​​​thanks and Merry Christmas

earl3

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!

DiMarko

thanks for clarifying. I appreciate. I left mine outside the airbox just to see if it going to fix my problem that I'm having with those sensors and I still get same codes no matter if they are inside airbox or not. Seems like I'm lacking power too and I have eurocharged ecu and tcu tune

JohnLane

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.

feets

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.

JohnLane

So air filters/no filters changed nothing. Surprising.

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.