Need some expert advice

[ndwgolf]

I’m sure I’m going to hear “I told you so” but here we go anyway.
I changed my stock exhaust to a custom made titanium exhaust on my new E53 AMG Coupe.
The sound that I got now has not met my expectations but it’s okay…….. the worrying thing is is that whenever I try to floor it (accelerate fast) my Turbo quits working, I get no dashboard warning just zero boost. A stop start of the engine resets it and it’s back to normal until the next time that I floor it and once again the turbos stop working. This has happened a total of 5 times now. After the second time I took it to a local garage where the owner specialize in MB, he plugged in and removed the error messages which showed up as low boost………. Some of that might have got lost in translation.
So I’m now thinking that I should just put my old stock exhaust back on and forget about trying to make my car sound like something it’s not.
I’m also worried that I could end up having more issues with the engine.

The bit that I don’t understand is that at least 10 people in the E53 group here in Thailand have modified there exhausts and none of them have had this boost issue that I’m getting.
Could it possibly just be a faulty sensor?
Thanks in advance
Neil

 

[jasonh]

You need a decent set of fault codes read with XENTRY or MB specific equipment.

I'd say something isn't adjusted correctly or even plugged in correctly. For example if the wastegate isn't closing fully/properly/at all then the car will detect an overboost situation and immediately enter limp home mode (which is reset by restarting the engine).

Under boost may also trigger limp home mode (I'm more familiar with BMW's) and a leak somewhere would cause the underboost.

It needs someone who know's what they're doing to go through the fault codes and the work that has been done.

 

[Steve84N]

I'm sure I've heard of people with stock exhausts where the valves have stopped working and this results in exhaust flow not as expected by the sensors so it trips a fault and there's no boost.

 

[kcsun]

Get the car to re-create the fault, get the fault code, post it on the forum and then hopefully it will be a quick fix
kc

 

[G7Wagen]

All the fault codes here , hope this helps.

 

[ndwgolf]

Under boost may also trigger limp home mode (I'm more familiar with BMW's) and a leak somewhere would cause the underboost.

It needs someone who know's what they're doing to go through the fault codes and the work that has been done

Jason
Today I’m taking my car to the guy that installed the exhaust as I can definitely hear a hissing sound coming from under the car, pretty much under my drivers seat.
After that I will drive my car back home and go and get a print out of the error codes and post them up
Thanks
Neil

 

[ndwgolf]

Get the car to re-create the fault, get the fault code, post it on the forum and then hopefully it will be a quick fix
kc

Okay.
I have just come back from a +/- 1500 mile trip from Phuket to Bangkok and back and I had the same experience with the car going into limp mode 3 times...........each time it was due to stamping on the gas, whenever I did that the turbos would stop working and the car would continue to drive without any boost, i could still nip along at 120 /140 kph but without any boost. I quick stop start of the engine would put everything back to normal.
So basically I would drive it still with plenty of power but would only use ~80% of the throttle. I absolutely love the sound of the car and after spending £2500 for the titanium exhaust I am reluctant to remove it and go back to stock.

Note I have never seen a warning light on the dash during any of these limp modes

Neil

 

[grober]

Nine Things You Must Know about the New Mercedes Inline-Six

Why Mercedes’ new inline six matters, even if no one is sure when we’ll see it

We dive into a familiar old engine design that points toward combustion’s future

www.autoweek.com

there's a delicate balance to be maintained between the electrically driven supercharger and the twin scroll turbo-- anything that upsets this liable to put the car into limp home mode.

OTHER possibility is that your twin scroll turbo has developed fault and its merely a co-incidence that it co-incided with the new exhaust fitment?

 

[Alex]

I fail to see how changing a cat-back exhaust could have caused the above sensor to malfunction. Have you checked if it's undamaged and most importantly connected? Could be one of those scenarios where your exhaust guys needed to gain access to the exhaust brackets and either disturbed or unplugged it. If it looks okay, I'd enquire how much a replacement would be from MB (should be peanuts compared to the exhaust cost) and try a new sensor.

 

[Petrol Pete]

Alex , have a look at the OP's first thread.

New Titanium Exhaust getting installed | AMG Lounge

A few more pictures. Been told it will be ready by lunch time tomorrow. Can't wait to hear it.

forums.mbclub.co.uk

 

[grober]

We are talking about the M256 straight 6 engine right?

 

[Petrol Pete]

No , The photos on the OP's first thread suggest a V8

 

[Rich764089]

No , The photos on the OP's first thread suggest a V8

I thought the E53 was 6 cylinder?

 

[Steve84N]

Straight six.

 

[ndwgolf]

Straight six.

Yes it’s a straight 6

 

[ndwgolf]

We are talking about the M256 straight 6 engine right?

It’s a C238 Benz E53 coupe 2019

 

[Petrol Pete]

Yes straight 6 , my mistake.

 

[grober]

A nice video about the many complex turbo / inlet interactions on the M256

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my guess and it's only a guess is the supercharger[electric] and turbocharger interaction sequuence goes as follows
stage I supercharger only
stage II supercharger + turbocharger
stage III turbocharger alone supercharger bypassed------ and it's at this final stage the problem is occurring

Will investigate further but online information is sparse on this complex engine

 

[grober]

ANOTHER QUESTION- does this happen in both exhaust switched positions---- mufflers inline or by-passed entirely? I think B28/26 is monitoring the air density where it enters the throttlebody/ turbo charger i.e. related to the electric supercharger boost

 

[ndwgolf]

ANOTHER QUESTION- does this happen in both exhaust switched positions---- mufflers inline or by-passed entirely? I think B28/26 is monitoring the air density where it enters the throttlebody/ turbo charger i.e. related to the electric supercharger boost

I tried it in both (valves open and closed) and the same thing happened.
I currently have a garage here in Phuket removing the titanium exhaust and installing the original MB exhaust. If the problem goes away then I will know that this engine doesn't like the new exhaust and I will try and sell the titanium exhaust. If the problem is still there I will take the car to Mercedes Benz and have them troubleshoot and fix the problem under warranty. Then make my mind up if I want to install it or not.
I will keep you posted on the outcome

Neil