R-Class (W251) Produced 2006-2013: R320CDI, R350, R420CDI, R500

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Old 11-18-2010, 03:46 PM
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06 R360, 06 F350 6.0, 04 CayenneS, 96 911TT 500HP, 86 928S, 74 911S, 73 914-4, 70 914-6, 02 Durrango
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What kind of modifications have you head of or performed?

I modified my grill so that air will force into the intake. Its not like i just put a huge funnel on the grill, nothing crazy. I cut the supposed "holes" in the diamond grill so that air fill flow through the grill and into the intake tubes.









Nothing major, I did this on both sides, I still want to cut out the other 2 diamonds.


Thanks!

Last edited by smokersteve; 11-18-2010 at 04:00 PM.
Old 11-19-2010, 01:37 PM
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Mercedes are tested on the Autobahn at speeds none of us will ever do, and I'd say we can be pretty confident the original cold air intakes are as efficient as they're going to get.
Old 11-19-2010, 04:26 PM
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Chip tuning, K&N Air filters. I have a Sprint Booster, doesn't add power but it really wakes up the throttle pedal - makes it feel stronger.
Old 11-19-2010, 09:14 PM
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06 R360, 06 F350 6.0, 04 CayenneS, 96 911TT 500HP, 86 928S, 74 911S, 73 914-4, 70 914-6, 02 Durrango
I have thought about using K&N filters. But decided not to be cause I want to keep the intake clean.

I just got performance tuning from powerchip. I'm in the middle of doing a wright up about it but the thread has already been created.

Thanks for the suggestions. any others?
Old 11-19-2010, 09:16 PM
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06 R360, 06 F350 6.0, 04 CayenneS, 96 911TT 500HP, 86 928S, 74 911S, 73 914-4, 70 914-6, 02 Durrango
Originally Posted by lkchris
Mercedes are tested on the Autobahn at speeds none of us will ever do, and I'd say we can be pretty confident the original cold air intakes are as efficient as they're going to get.

I am not trying to attack or insult you. That statement has ignorance. Everything has room for improvement.
Old 11-19-2010, 11:43 PM
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Originally Posted by lkchris
Mercedes are tested on the Autobahn at speeds none of us will ever do, and I'd say we can be pretty confident the original cold air intakes are as efficient as they're going to get.
Way to be a forward thinker!
Old 11-20-2010, 11:10 AM
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All machines are an exercise in compromise. All business decisions consider costs and liability. If thats not an indicator for improvement, I don't know what is. If there were no compromises, we would all have Ferrari V-12s in our cars.

As for the intake ports on the R class, they seem better than many cars as they are directly facing forward with no turns and minimial angles. Most cars turn up 90 degrees to avoid water ingestion. This is the safety/reliability compromise. The R class compormise for water ingestion seems to be the blocked off grill. So yes, open that up to get more air flow.

As to the ones who say MB has already done it all. Yes, possibly. For the volume of air the 3.5 L engine requires, the dual intake probably suffices. So why open the grill? If you want to get the abolute max air flow at the lowest possible temp. Will it make much difference? Not likely on the factory tune. But if you can increase the engine efficiency through other modes, it can help.

I have K&N filters because I like the ability to keep the fliters at their cleanest. If there is increased airflow too - well thats another bennie. Never had dirt problems in the TB in every car I have put a K&N in. You just have to oil it properly.
Old 11-20-2010, 12:18 PM
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Originally Posted by cyeung65
All machines are an exercise in compromise. All business decisions consider costs and liability. If thats not an indicator for improvement, I don't know what is. If there were no compromises, we would all have Ferrari V-12s in our cars.

As for the intake ports on the R class, they seem better than many cars as they are directly facing forward with no turns and minimial angles. Most cars turn up 90 degrees to avoid water ingestion. This is the safety/reliability compromise. The R class compormise for water ingestion seems to be the blocked off grill. So yes, open that up to get more air flow.

As to the ones who say MB has already done it all. Yes, possibly. For the volume of air the 3.5 L engine requires, the dual intake probably suffices. So why open the grill? If you want to get the abolute max air flow at the lowest possible temp. Will it make much difference? Not likely on the factory tune. But if you can increase the engine efficiency through other modes, it can help.

I have K&N filters because I like the ability to keep the fliters at their cleanest. If there is increased airflow too - well thats another bennie. Never had dirt problems in the TB in every car I have put a K&N in. You just have to oil it properly.

You just have to oil it properly.

Agree to this, do not over oil the K & N filter after cleaning because it will damage or contaminate the mass air sensor.

The best way is discard the old K & N filter and replace with the new one, If one does not want to clean the filter and re-oil.
Old 11-20-2010, 12:45 PM
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06 R360, 06 F350 6.0, 04 CayenneS, 96 911TT 500HP, 86 928S, 74 911S, 73 914-4, 70 914-6, 02 Durrango
Originally Posted by cyeung65
All machines are an exercise in compromise. All business decisions consider costs and liability. If thats not an indicator for improvement, I don't know what is. If there were no compromises, we would all have Ferrari V-12s in our cars.

good point!!

As for the intake ports on the R class, they seem better than many cars as they are directly facing forward with no turns and minimial angles. Most cars turn up 90 degrees to avoid water ingestion. This is the safety/reliability compromise. The R class compormise for water ingestion seems to be the blocked off grill. So yes, open that up to get more air flow.

One thing they did to prevent taking in water is to have the air filters on the top, so they suck up, and the water will settle at the bottom.

As to the ones who say MB has already done it all. Yes, possibly. For the volume of air the 3.5 L engine requires, the dual intake probably suffices. So why open the grill? If you want to get the abolute max air flow at the lowest possible temp. Will it make much difference? Not likely on the factory tune. But if you can increase the engine efficiency through other modes, it can help.

I have K&N filters because I like the ability to keep the fliters at their cleanest. If there is increased airflow too - well thats another bennie. Never had dirt problems in the TB in every car I have put a K&N in. You just have to oil it properly.

comments ^^^^^^^
Old 11-20-2010, 03:56 PM
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Originally Posted by smokersteve
I am not trying to attack or insult you. That statement has ignorance. Everything has room for improvement.
But is doesn't happen when performed by nonengineers in their driveway.
Old 11-20-2010, 09:04 PM
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Originally Posted by lkchris
But is doesn't happen when performed by nonengineers in their driveway.
Did smokersteve state what his profession or automotive experience is? How did you assume that? I also don't think that his mod will translate to better performance but that doesn't give me the right to insult the guy does it?

Last edited by aggst1; 11-20-2010 at 09:06 PM.
Old 11-21-2010, 08:53 AM
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Mods aren't for everyone. To each their own.


I have made driveway mods with bolt on parts on my Corvette that have netted 60 hp at the rear wheels.

"Can't we all just get along?" - career criminal

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