W211 AMG Discuss the W211 AMG's such as the E55 and the E63
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Upgraded by pass valves

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Old 01-30-2015, 04:40 PM
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2004 E55 AMG, 2006 CLS63, 2004 ML55, 2014 E350 sport
Upgraded by pass valves

Is the reason for doing this the stock ones leak a bit? Anybody seen this before?

http://www.vjpn.com/galleryitem/amg-...onwagon-vol-4/

www.Wetterauer.de

They are claiming fairly substantial gains with their tunes. There must be something to those dump valves for gains like they claim?

It looks like a stock valve they have machined parts to modify it and make it better?

Last edited by austingtir; 01-30-2015 at 04:53 PM.
Old 01-30-2015, 04:47 PM
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those are EGR emission related valves.
Old 01-30-2015, 05:00 PM
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Originally Posted by shardul
those are EGR emission related valves.
Thats what I was thinking the bottom of it clearly goes down to the valve cover area or into the motor.

So what benefit to modify those?

They must be leaking boost into the crankcase surely for them to goto to that effort?

Last edited by austingtir; 01-30-2015 at 05:09 PM.
Old 01-30-2015, 05:11 PM
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benefits is may be there when it is deleted, but not sure if it is quantifiable.

if you following the nylon tubing it goes under the SC and is plumbed into the intake.

Hot exhaust gases are recirculated into the intake from time to time and it is controlled by the ECU. Deleting them may cool down the intake charge a bit
Old 01-30-2015, 05:18 PM
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Originally Posted by shardul
benefits is may be there when it is deleted, but not sure if it is quantifiable.

if you following the nylon tubing it goes under the SC and is plumbed into the intake.

Hot exhaust gases are recirculated into the intake from time to time and it is controlled by the ECU. Deleting them may cool down the intake charge a bit
But those still look like they are designed to operate. I reckon the stock ones must leak a bit of boost down into the crankcase... maybe when the boost is raised its worse?

Wondering how I can do a test to figure out if they do leak. I think I might take one off and put compressed air behind it at about 20psi......
Old 01-30-2015, 05:20 PM
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those are vacuum operated and controlled by the switch over valve which is located on the passenger side valve cover
Old 01-30-2015, 05:29 PM
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Yep I understand the operation now. These basically open when at idle or backing off.

So if they leak when I put about 20-30psi pressure from the side with the rubber hose going to the supercharger then they are crap.

As you say theres probably no harm in just blocking that crap off? Worst case is it needs a retune to suit the idle.

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Old 01-30-2015, 05:41 PM
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blocking them off will trigger a CEL. I think some tuner have be successful is coding them out .

the SLR has them routed differently

https://mbworld.org/forums/slr-mclar...rger-sale.html
Old 01-30-2015, 08:32 PM
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I just put pressure on this valve! I am very surprised.

about 4~-30psi blows this thing open.

Blow in it with your mouth it doesnt leak... maybe a miniscule amount which is normal for a pcv valve.

Im pretty much convinced these things leak pretty bad. Can someone else with a compressor and some common sense have a look into this I am pretty much in disbelief with what im seeing here!

Is there pressure on those hoses coming out of the front of the supercharger when it develops boost? Am I just missing something here?

Last edited by austingtir; 01-30-2015 at 08:38 PM.
Old 01-30-2015, 08:35 PM
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Double post...
Old 01-30-2015, 09:03 PM
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those hoses go the to secondary air pump. they are cast in the front cover and don't go through the SC air pressure path
Old 01-30-2015, 10:00 PM
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Originally Posted by shardul
those hoses go the to secondary air pump. they are cast in the front cover and don't go through the SC air pressure path
O.K thanks I can see how that is routed now. Is there any tech documents explaining how this system operates and the reason for routing it through the supercharger snout like that?

Im still curious as to the exact reason to upgrade these valves. This is not a cheap exercise by the looks of it.

They must of just put higher pressure springs in them?
Old 01-31-2015, 01:04 AM
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E55
this is not an egr system. this is secondary air injection. the switchover valve is opened at cold start and the air pump is also activated at the same time. the diverter valves are opened via vacuum from the switchover valve and then the fresh air from the air pump is routed into each of the diverter valves which flow down into the cylinder head to mix in with the exhaust. this is to create an afterburn affect to increase the catalyst temperature more rapidly.
the routing is just going through the snout but never mixes in with induction air.
Old 01-31-2015, 01:21 AM
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Originally Posted by Rocman8
this is not an egr system. this is secondary air injection. the switchover valve is opened at cold start and the air pump is also activated at the same time. the diverter valves are opened via vacuum from the switchover valve and then the fresh air from the air pump is routed into each of the diverter valves which flow down into the cylinder head to mix in with the exhaust. this is to create an afterburn affect to increase the catalyst temperature more rapidly.
the routing is just going through the snout but never mixes in with induction air.
Interesting I remember now that I have read about this system before thanks for the reminder..... but why would a tuner go to the trouble of modifying these valves like this?

This is not a 5 minute thing to mod they've dismantled the valves and upgraded the spring and possibly the diaphragm, machining new retainer hats for it? Why??

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