Power throttling at high speeds
Thread Starter
Newbie
Joined: Apr 2018
Posts: 7
Likes: 2
From: Winnipeg
Mercedes-AMG C43 Sedan
Power throttling at high speeds
Vehicle:
2017 Mercedes-AMG C43 Sedan (~2,300 km/~1,400 miles)
Modifications:
Eurocharged v3.0 performance engine software, K&N air filters, ASR exhaust flap control
Nature of the issue:
I recently purchased a Dragy GPS performance meter and performed a few runs to test the performance of my C43. I had the oil changed just after breaking-in the engine and this is the first time I've really ran the vehicle hard from a stand-still. The issue that I'm experiencing is that, when I reach ~165 km/h (~105 mph) during full-throttle, the engine reduces power and it feels as if I'm easing-up on the gas pedal. This is substantiated by information on the "Engine Data" menu on the infotainment system as it drops from maximum power to ~270 hp. What is strange is that this issue only occurs if I run the vehicle hard from a stand-still. If I'm cruising at ~100 km/h (~62 mph) and go full-throttle, I can reach speeds >200 km/h (~124 mph) without experiencing a power reduction. I brought my C43 to the Mercedes dealership this morning and they ran a full diagnostic check via their Xentry system and found no issues or stored fault codes and she shop foreman performed a reset of all systems; however, the issue still persists. According to Dragy, the performance is where it should be for this vehicle with these modifications (0 - 60 mph in 3.68s), although quarter mile times suffer as power is reduced before the full quarter mile is finished, and therefore, also results in a lower trap speed (11.91s @ 110 mph).
Any suggestions, thoughts or guidance is appreciated; thank you.
2017 Mercedes-AMG C43 Sedan (~2,300 km/~1,400 miles)
Modifications:
Eurocharged v3.0 performance engine software, K&N air filters, ASR exhaust flap control
Nature of the issue:
I recently purchased a Dragy GPS performance meter and performed a few runs to test the performance of my C43. I had the oil changed just after breaking-in the engine and this is the first time I've really ran the vehicle hard from a stand-still. The issue that I'm experiencing is that, when I reach ~165 km/h (~105 mph) during full-throttle, the engine reduces power and it feels as if I'm easing-up on the gas pedal. This is substantiated by information on the "Engine Data" menu on the infotainment system as it drops from maximum power to ~270 hp. What is strange is that this issue only occurs if I run the vehicle hard from a stand-still. If I'm cruising at ~100 km/h (~62 mph) and go full-throttle, I can reach speeds >200 km/h (~124 mph) without experiencing a power reduction. I brought my C43 to the Mercedes dealership this morning and they ran a full diagnostic check via their Xentry system and found no issues or stored fault codes and she shop foreman performed a reset of all systems; however, the issue still persists. According to Dragy, the performance is where it should be for this vehicle with these modifications (0 - 60 mph in 3.68s), although quarter mile times suffer as power is reduced before the full quarter mile is finished, and therefore, also results in a lower trap speed (11.91s @ 110 mph).
Any suggestions, thoughts or guidance is appreciated; thank you.
Senior Member
Joined: Apr 2018
Posts: 402
Likes: 128
From: Houston
2018 C43 sedan
I wonder if this is a cooling issue and the car is pulling timing?
What temps are you driving in? The car will cool better at high speeds which might explain why you don't have the issue at highway speeds. Maybe the increased boost pressure is putting a strain on the cooling system?
What temps are you driving in? The car will cool better at high speeds which might explain why you don't have the issue at highway speeds. Maybe the increased boost pressure is putting a strain on the cooling system?
MBWorld Fanatic!
Joined: Nov 2015
Posts: 1,255
Likes: 154
From: Massachusetts USA
2017 C43 sedan
Did the dealership see you had a Eurocharged tune when they did the test? Also did you have any updates to the transmission software or fuel system? I know there are updates for certain c43.. maybe all your software needs to be updated since the tune is for the latest softwares in the TCU and ECU? Also what is the build date of your c43? Is it an early production model for 2017?
Last edited by Gungaslow; May 4, 2018 at 07:28 PM.
Thread Starter
Newbie
Joined: Apr 2018
Posts: 7
Likes: 2
From: Winnipeg
Mercedes-AMG C43 Sedan
I wonder if this is a cooling issue and the car is pulling timing?
What temps are you driving in? The car will cool better at high speeds which might explain why you don't have the issue at highway speeds. Maybe the increased boost pressure is putting a strain on the cooling system?
What temps are you driving in? The car will cool better at high speeds which might explain why you don't have the issue at highway speeds. Maybe the increased boost pressure is putting a strain on the cooling system?
Did the dealership see you had a Eurocharged tune when they did the test? Also did you have any updates to the transmission software or fuel system? I know there are updates for certain c43.. maybe all your software needs to be updated since the tune is for the latest softwares in the TCU and ECU? Also what is the build date of your c43? Is it an early production model for 2017?
Thread Starter
Newbie
Joined: Apr 2018
Posts: 7
Likes: 2
From: Winnipeg
Mercedes-AMG C43 Sedan
For the benefit of those who have a Eurocharge tune (potentially other tuners as well), I contacted Eurocharged regarding this issue and received this response:
Clearly this information would have been beneficial to know prior to spending ~$2,400 on a tune, but I'm glad they're aware of this issue and hopefully they remedy it shortly.
Originally Posted by Eurocharged Canada
Thank you for your feedback. This is an issue that these cars have where at certain conditions they hit a boost limiter. We are working on a updated software to overcome this issue in the car. I will keep you posted on this
Super Member
Joined: Jun 2017
Posts: 526
Likes: 86
From: Toronto
2017 C43 AMG Cabriolet Black/Cranberry Red
For the benefit of those who have a Eurocharge tune (potentially other tuners as well), I contacted Eurocharged regarding this issue and received this response:
Clearly this information would have been beneficial to know prior to spending ~$2,400 on a tune, but I'm glad they're aware of this issue and hopefully they remedy it shortly.
Clearly this information would have been beneficial to know prior to spending ~$2,400 on a tune, but I'm glad they're aware of this issue and hopefully they remedy it shortly.
Junior Member
Joined: Feb 2018
Posts: 51
Likes: 11
Mercedes Benz C43 AMG
For the benefit of those who have a Eurocharge tune (potentially other tuners as well), I contacted Eurocharged regarding this issue and received this response:
Clearly this information would have been beneficial to know prior to spending ~$2,400 on a tune, but I'm glad they're aware of this issue and hopefully they remedy it shortly.
Clearly this information would have been beneficial to know prior to spending ~$2,400 on a tune, but I'm glad they're aware of this issue and hopefully they remedy it shortly.
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Junior Member
Joined: Sep 2017
Posts: 51
Likes: 12
18' C43 cab
Ambient air temperature was ~10 degrees Celsius. Engine, transmission and coolant temperatures were all in normal operating ranges and the engine was warmed-up prior to being pushed.
The dealership is aware that I had my ECU flashed by Eurocharged. All system updates were done prior to having the ECU flashed and the build date of this vehicle is February of 2017.
The dealership is aware that I had my ECU flashed by Eurocharged. All system updates were done prior to having the ECU flashed and the build date of this vehicle is February of 2017.
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MBWorld Fanatic!
Joined: Nov 2015
Posts: 1,255
Likes: 154
From: Massachusetts USA
2017 C43 sedan
i myself have AMR RV3.1 and have no issues with boost at all.. from 0-1/4 mile is great and also from 60-120 no problem.. I also had their SV Version prior to the latest rv3.1 and that was bulletproof also!
Super Member
Joined: Jun 2017
Posts: 526
Likes: 86
From: Toronto
2017 C43 AMG Cabriolet Black/Cranberry Red
The boost limiters just need to be simply adjusted. The barometric pressure sensor is reading high so it cuts the boost.
Senior Member
Joined: Nov 2005
Posts: 410
Likes: 176
2020 GLC 63
Does anyone have a v3 dyno sheet with boost and afr readings? It might tell you what's going on, v3 from any of the big 3 tuners.
