2012+ E550 Performance upgrades
Newbie
Joined: Jul 2014
Posts: 11
Likes: 0
From: Florida
2014 E550 Sedan
I have a 2014 E550 4matic and I am also interested in doing the ECU upgrade from Rentech, however I have a few concerns. I am concerned about the transmission and the 4 matic system. Does anyone have the upgrade for any length of time? Has anyone experienced any long term problem? I don't want to shorten the life of my trans or damage the 4matic system. I am worried that the drive-train can't handle the increased power. Lastly, my last question is how does the car drive day to day as a daily driver.
Out Of Control!!
Joined: Jun 2004
Posts: 13,799
Likes: 3,229
2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
I have a 2014 E550 4matic and I am also interested in doing the ECU upgrade from Rentech, however I have a few concerns. I am concerned about the transmission and the 4 matic system. Does anyone have the upgrade for any length of time? Has anyone experienced any long term problem? I don't want to shorten the life of my trans or damage the 4matic system. I am worried that the drive-train can't handle the increased power. Lastly, my last question is how does the car drive day to day as a daily driver.
Super Member
Joined: Nov 2013
Posts: 991
Likes: 86
From: Washington DC area
Mine: 2014 E550 4matic; Hers: 2016 CLS 400 4matic
No kidding - if I knew that a Renntech flash would not impact my warranty I would have done it already. As is the E550 is pretty awesome - a flash would turn it into a true monster - call it an AMG-lite!
MBWorld Fanatic!
Joined: May 2006
Posts: 1,319
Likes: 252
From: Virginia
W212 M276 DELA 30 ; W211 M113k, W126 M117, W126 OM617, W211 OM642 ; R107 M117 X2, Sierra 1500 LZ0
And it would probably end up being faster than any of the NA E63 AMGs. Wouldn't want to line up against a TT 5.5 AMG though...
Newbie
Joined: Jul 2014
Posts: 11
Likes: 0
From: Florida
2014 E550 Sedan
I was wondering if anyone had any information on how the Ren tech ECU upgrade affects the transmission long-term? I am interested in buying this upgrade for my car but I was concerned about longevity of the vehicle. I have a 2014 E550 sedan 4Matic. Any advice would be appreciated.
Newbie
Joined: Jul 2012
Posts: 1
Likes: 0
2011 E350 w212
Thats crazy, i just purchased a 2014 E550 Coupe, did the resonator delete with straight pipes and ran a best of 12.48 @ 112.38. i want the tune done but im not sure if there is any difference between the 2012 and the 2014 or is it that your is a sedan?
Super Member
Joined: Nov 2013
Posts: 991
Likes: 86
From: Washington DC area
Mine: 2014 E550 4matic; Hers: 2016 CLS 400 4matic
I think the difference might be due to weight. E550 4matic is a heavy ride.
