PE Valves Default Open?
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2018 Mercedes C43 AMG Coupe
If you are getting crackles and pops in Sport with the button then you will get the same effects without hitting the button. With the ASR the flaps are completely open all the time! The crackles and pops are due to the ECU programming and the flaps being open on the PE. Not the button! Ordinarily the flaps are only fully open at higher rpms. The module simply keeps them fully open, closed, or stock......
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From: North Jersey
c43 Amg coupe
Last edited by DVision44; Jul 22, 2018 at 10:26 PM.
Super Member
Joined: Nov 2017
Posts: 711
Likes: 108
2018 Mercedes C43 AMG Coupe
I stand corrected....sorry. I had a long ride today so I played with it a bit and the button does make a difference in Sport+ and Individual mode. Sport+ doesn't matter because when you switch to it the button is auto activated but when I went to Individual I had the deeper sound with no cracks or pops at all. In Comfort and Sport there was no difference. In Sport I got occasional sounds when I let off the gas and on downshifts whether the button was on or off.. Especially when going downhill.
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From: Toronto, ON
2021 Mercedes C63s AMG Coupe
I stand corrected....sorry. I had a long ride today so I played with it a bit and the button does make a difference in Sport+ and Individual mode. Sport+ doesn't matter because when you switch to it the button is auto activated but when I went to Individual I had the deeper sound with no cracks or pops at all. In Comfort and Sport there was no difference. In Sport I got occasional sounds when I let off the gas and on downshifts whether the button was on or off.. Especially when going downhill.
I have explained this previously as well in another thread. The exhaust button on our car does not ONLY control the position of the exhaust valves, but also connects to the module that changes the fueling for the added AMG flatulence and turns it as well. I actually did this experiment the same day I got my ASR module installed.
So to summarize->
- IF you keep the car in comfort mode, meaning the engine is in comfort mode, and you open the valves using the ASR module, you will get upshift bangs, but you will not get any lift off over runs.
- IF you keep the car in sports+, then manually turn off the exhaust button as it turns on automatically with sports+, the lift off over run will disappear as well
- To get the full range of sounds specific to the AMG PE, the car has to be in S+ and the exhaust button must be red. The exhaust button is not on, the over runs will not occur.
So why get the ASR module?
To keep the valves 100% open, as even in S+ with the exhaust button on, the valves do not open 100 percent until you go above 4000 rpm. So your car will sound the same above 4000 rpm while accelerating if you have the ASR module or not. What it changes is the low RPM noise by keeping the valve fully open at all times. Also it keeps the valve 100% open during lift off, so the lift off burbles are louder as well.
An ASR module combined with a res delete would give you an exhaust system that can be rivaled by very few cars for its own unique characteristics. I have never loved this car more.
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Joined: Dec 2016
Posts: 116
Likes: 14
'17 C43 Coupe
I have explained this previously as well in another thread. The exhaust button on our car does not ONLY control the position of the exhaust valves, but also connects to the module that changes the fueling for the added AMG flatulence and turns it as well. I actually did this experiment the same day I got my ASR module installed.
So to summarize->
- IF you keep the car in comfort mode, meaning the engine is in comfort mode, and you open the valves using the ASR module, you will get upshift bangs, but you will not get any lift off over runs.
- IF you keep the car in sports+, then manually turn off the exhaust button as it turns on automatically with sports+, the lift off over run will disappear as well
- To get the full range of sounds specific to the AMG PE, the car has to be in S+ and the exhaust button must be red. The exhaust button is not on, the over runs will not occur.
So why get the ASR module?
To keep the valves 100% open, as even in S+ with the exhaust button on, the valves do not open 100 percent until you go above 4000 rpm. So your car will sound the same above 4000 rpm while accelerating if you have the ASR module or not. What it changes is the low RPM noise by keeping the valve fully open at all times. Also it keeps the valve 100% open during lift off, so the lift off burbles are louder as well.
An ASR module combined with a res delete would give you an exhaust system that can be rivaled by very few cars for its own unique characteristics. I have never loved this car more.
So to summarize->
- IF you keep the car in comfort mode, meaning the engine is in comfort mode, and you open the valves using the ASR module, you will get upshift bangs, but you will not get any lift off over runs.
- IF you keep the car in sports+, then manually turn off the exhaust button as it turns on automatically with sports+, the lift off over run will disappear as well
- To get the full range of sounds specific to the AMG PE, the car has to be in S+ and the exhaust button must be red. The exhaust button is not on, the over runs will not occur.
So why get the ASR module?
To keep the valves 100% open, as even in S+ with the exhaust button on, the valves do not open 100 percent until you go above 4000 rpm. So your car will sound the same above 4000 rpm while accelerating if you have the ASR module or not. What it changes is the low RPM noise by keeping the valve fully open at all times. Also it keeps the valve 100% open during lift off, so the lift off burbles are louder as well.
An ASR module combined with a res delete would give you an exhaust system that can be rivaled by very few cars for its own unique characteristics. I have never loved this car more.
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Joined: Nov 2016
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From: Toronto, ON
2021 Mercedes C63s AMG Coupe
The biggest issue I have with this car is that it is so quiet at low RPMs to the point that it doesn't even sound like a sports car. From what you mentioned above, the ASR makes a big difference in this aspect? Do you have a sound clip of your car with one installed? I'm highly considering buying one but I have yet to find a good video of a car with it installed and the quality being good enough for me to see the difference.
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Joined: Dec 2016
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'17 C43 Coupe
So if you didn’t do the res delete and just had the module itself, is it still worth it?
MBWorld Fanatic!
Joined: Nov 2016
Posts: 1,527
Likes: 287
From: Toronto, ON
2021 Mercedes C63s AMG Coupe
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