V12 guys CHECK YOUR AIRBOXES...
09-29-2009, 12:54 AM
#29
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W220 S65 AMG
Mine were both dented and one was sucked into the airbox blocking it. I saw the same exact airbox design on the new 2010 S600.. Guess it worked for them for the past 7 years.
Funny thing is, most of us saw large dents but no rocks, they must fall out when you hit the brakes.
Funny thing is, most of us saw large dents but no rocks, they must fall out when you hit the brakes.
12-26-2010, 01:57 AM
#31
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SL65 AMG
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I happened upon this post, Great reading but would also suggest that turbos are equally or more so sensitive to exhaust back pressure, Should one or both side cat converters plug up or fail it also will cause a drop in performance. I'm also willing to bet those are inlet temp sensors not pressure sensors in the inlets. That,s one of the many ways the ECU determines fuel calculations. Restricted fuel filters are another often neglected items than can rob power.
Last edited by turbolou; 12-26-2010 at 02:12 AM.
01-01-2011, 04:55 PM
#32
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2007 E63, 2006 C55
RE: Intake Screens
I had a little spare time today, and took a peak at my screens. Both screens were where they belong, no dents or anything, BUT, there was considerable dirt, i.e. leaves, a couple of acorns, hair (yes hair) in front of them which must have been choking the intake, mostly on the driver side.
Needless to say I removed them. I'm sure the engineers had some reason to install these screens, I'm struggling to understand exactly what it was, but my car has never run better now that I'm roaming the streets screenless.
Check those screens fellas.
Needless to say I removed them. I'm sure the engineers had some reason to install these screens, I'm struggling to understand exactly what it was, but my car has never run better now that I'm roaming the streets screenless.
Check those screens fellas.
03-06-2011, 09:02 PM
#33
Interesting Update:
Talking to my technician today, DSMED, Mercedes found a way to make this relatively small issue like the one in question here really have more an effect on things than I had thought.
Unlike traditional airboxes, the V12s actually have pressure sensors on both of them. These sensors are in place to make sure that the amount of vacuum generated from each airbox is equal. Why does MB want vacuum to be equal? Well, both turbos feed a single intake manifold, and since this manifold is where our MAP sensor is located, it's looking for a target amount of boost. If there is a situation where there is an obstruction in one of the intake paths (like, a loose screen filter) theoretically one turbo would create a bit more pressure in order to compensate and meet the target boost at the single intake manifold. Nein! says Mercedes. In my case, since my passenger side intake was generating significantly less vacuum, the airboxes noticed the difference and it restricted boost from my driver's side turbo to match that what my passenger side turbo w/ constricted airflow was making. This is done in order to prevent one turbo from spinning too much and "I guess" causing damage to it from overboosting.
So you take what is a relatively trivial problem - a slightly obstructed intake tube - add a complex airbox pressure measurement system, and you've now turned this trivial problem into something that could have a noteworthy effect on how much power the car is making!
Learn something new everyday. I've never seen an ECU monitor airbox pressure before.
-m
Talking to my technician today, DSMED, Mercedes found a way to make this relatively small issue like the one in question here really have more an effect on things than I had thought.
Unlike traditional airboxes, the V12s actually have pressure sensors on both of them. These sensors are in place to make sure that the amount of vacuum generated from each airbox is equal. Why does MB want vacuum to be equal? Well, both turbos feed a single intake manifold, and since this manifold is where our MAP sensor is located, it's looking for a target amount of boost. If there is a situation where there is an obstruction in one of the intake paths (like, a loose screen filter) theoretically one turbo would create a bit more pressure in order to compensate and meet the target boost at the single intake manifold. Nein! says Mercedes. In my case, since my passenger side intake was generating significantly less vacuum, the airboxes noticed the difference and it restricted boost from my driver's side turbo to match that what my passenger side turbo w/ constricted airflow was making. This is done in order to prevent one turbo from spinning too much and "I guess" causing damage to it from overboosting.
So you take what is a relatively trivial problem - a slightly obstructed intake tube - add a complex airbox pressure measurement system, and you've now turned this trivial problem into something that could have a noteworthy effect on how much power the car is making!
Learn something new everyday. I've never seen an ECU monitor airbox pressure before.
-m
Damn, i JUST took them out of my 2007 S65. They were in place...only 10K miles on the car. GLAD i stumbled on this post.
I am trying to figure out why my IATs are 160F ALL THE ****ING TIME. Meziere I/C pump did JACK ****. My car is ****ing LAME SLOW. I am pissed.
05-04-2013, 03:34 PM
#34
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07' SL65, 04' E55, 03' Evo8, 08' GSXR, DSM's...
I know this is an old thread. But if anyone who has removed their inlet screens wants to get rid of them, PM me so i can try something with them. Thanks.
Aaron
Aaron
