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    • RENNtech M278 twin turbo 4.6 liter V8 ECU tune upgrade - +70 horsepower, 530 crank horsepower for C218 CLS550

      RENNtech is proud to announce our latest ECU performance upgrade for the all new M278 engine currently in the C218 CLS 550, E550, CL550, S550 and other upcoming Mercedes models. We have been hard at work refining our performance tune for these engines and are pleased to announce our latest ECU upgrade. Itís clear that the 4.6L V8 biturbo engine from Mercedes is certainly underrated from the factory and though our extensive testing and R&D; our ECU upgrade truly unleashes the performance lurking in the M278 engine.

      RENNtechís ECU upgrade for the M278 offers huge gains across the entire RPM range; increasing crank performance numbers an additional 70 HP and 80 TQ. This translates to an astonishing 530 HP and 606 lb/ft of torque at the crank! These numbers are factored at a conservative 15% drive train loss.

      The performance increase is instantly noticeable at the bottom end and continues throughout the biturbo engines broad powerband.

      Here is the CLS 550 (C218) dyno sheet:



      Our CLS 550 stage 1 ECU upgrade is available now for $2,740. For additional information, visit out product webpage:

      http://www.renntechmercedes.com/www/node/657

      or contact one of our sales representatives at 561-845-7888.

      This article was originally published in forum thread: Article: RENNtech M278 twin turbo 4.6 liter V8 ECU tune upgrade - +70 horsepower, 530 crank horsepower for C218 CLS550 started by mark@renntech View original post
      Comments 104 Comments
      1. Sticky's Avatar
        Sticky -
        Well not a 4matic clearly.
      1. Dueclaws's Avatar
        Dueclaws -
        Clearly.
        I should've asked him the size and rating of the rear tires.
      1. Dueclaws's Avatar
        Dueclaws -
        Click here to enlarge Originally Posted by Dueclaws Click here to enlarge
        Clearly.
        I should've asked him the size and rating of the rear tires.
        Reply from the CLS550 owner:
        Stock 285 30 19 Pirelli P-Zero. As you noted before the car should really have come with a limited slip diff. With that and drag radials mid 11's.
      1. Sticky's Avatar
        Sticky -
        I would think we should see LSD's for these things fairly quickly. It just makes no sense they don't have it to begin with.
      1. Dueclaws's Avatar
        Dueclaws -
        Quaife makes a LSD for CLS550, E 550 sedan, and for 2011 and older E 550 Coupes. As discussed in a previous thread, the stock or Quaife LSD and housing assembly for a C63 will fit. but its different ratio might thow a curve to the transmission's computer and ESP computer.

        Brabus told me they'd make one for my '12 E550C, but they want $7,000 and I must ship the differential to Germany.....sure: gonna do that...Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Dueclaws Click here to enlarge
        Brabus told me they'd make one for my '12 E550C, but they want $7,000 and I must ship the differential to Germany.....sure: gonna do that..
        You just gotta wait... it will come.
      1. Dueclaws's Avatar
        Dueclaws -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        You just gotta wait... it will come.
        If patience is a virtue, I'm in trouble....
      1. hayel's Avatar
        hayel -
        hi, just drove my new Mercedes 12 e500 with the Brabus engine kit and it is a rocket..
        this Brabus kit made all the diffrence as the car is very fast off the line. i think it will do 0 to 100KM in the low 4 sec..
        one thing i dont like is the tire grip as my E500 is a rear wheel drive and with this power it is very hard to get a grip.
        in manual mode when shifting from 1st to 2nd gear the wheels spin. its that fast.
        so anyone considering the Brabus engine kit, i say it was worth $8,000 and i am very happy with it. by the way the kit came with an extra cooler.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by hayel Click here to enlarge
        hi, just drove my new Mercedes 12 e500 with the Brabus engine kit and it is a rocket..
        this Brabus kit made all the diffrence as the car is very fast off the line. i think it will do 0 to 100KM in the low 4 sec..
        one thing i dont like is the tire grip as my E500 is a rear wheel drive and with this power it is very hard to get a grip.
        in manual mode when shifting from 1st to 2nd gear the wheels spin. its that fast.
        so anyone considering the Brabus engine kit, i say it was worth $8,000 and i am very happy with it. by the way the kit came with an extra cooler.
        I have no doubt you are happy with it but $8000 is a lot of money for what I guess is a tune and oil cooler?
      1. Dueclaws's Avatar
        Dueclaws -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        I have no doubt you are happy with it but $8000 is a lot of money for what I guess is a tune and oil cooler?
        Sticky-
        I believe the Brabus kit comes with a separate-dedicated radiator for intercooler. The stock unit is part of the engine's radiator.
        $8,000 is still a lot.
        D.C.
      1. SLS AMG's Avatar
        SLS AMG -
        Click here to enlarge Originally Posted by hayel Click here to enlarge
        hi, just drove my new Mercedes 12 e500 with the Brabus engine kit and it is a rocket..
        this Brabus kit made all the diffrence as the car is very fast off the line. i think it will do 0 to 100KM in the low 4 sec..
        one thing i dont like is the tire grip as my E500 is a rear wheel drive and with this power it is very hard to get a grip.
        in manual mode when shifting from 1st to 2nd gear the wheels spin. its that fast.
        so anyone considering the Brabus engine kit, i say it was worth $8,000 and i am very happy with it. by the way the kit came with an extra cooler.
        what are the gains?
      1. hayel's Avatar
        hayel -
        Brabus is saying about 500hp. i know $8,000 is very expensive but i am very confident of Brabus that they do a perfect job. if i have any issues i know i can count on them.
      1. SLS AMG's Avatar
        SLS AMG -
        Click here to enlarge Originally Posted by hayel Click here to enlarge
        Brabus is saying about 500hp. i know $8,000 is very expensive but i am very confident of Brabus that they do a perfect job. if i have any issues i know i can count on them.
        Glad you're liking it. Brabus is a top notch company
      1. Dueclaws's Avatar
        Dueclaws -
        Click here to enlarge Originally Posted by SLS AMG Click here to enlarge
        Glad you're liking it. Brabus is a top notch company
        +1
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by hayel Click here to enlarge
        Brabus is saying about 500hp. i know $8,000 is very expensive but i am very confident of Brabus that they do a perfect job. if i have any issues i know i can count on them.
        This is true, they are reputable and top notch.
      1. sixgun's Avatar
        sixgun -
        Click here to enlarge Originally Posted by 427 Click here to enlarge
        Is anyone currently running this tune in their CLS550... if so, may we please have some feedback?
        I have a new 2014 MB CLS 550 with Renntech upgrade
        One word: phenomenal
        Performance over stock is startling
        Much better power band with no rev limiter or top speed governor(factory is 149mph...Renntech is 189 mph)
        Acceleration is superb..pins you to the seat back
        Still, admittedly, some momentary turbo lag, but not as bad as Porsche 911 Turbos I have owned for instance
        Performance is even greater with the CLS when you realize it's a big heavy 4 door coupe, not sedan, as MB refers to it as a coupe due to no center window pillar
        Mid range acceleration 50-130 is incredible
        Very smooth, but tons of power when you need it..or want it!
        I might add that handling is also superb...the huge rear tires make a big difference, but for a big car, the handling is remarkable
        ..stable, solid and quick
        I have had many high performance cars and currently also have a Dodge Viper
        which is a different type of fast!
        I chose the CLS over a Panamera...liked the styling better and performance with the twin turbos..engine is just awesome!
      1. sixgun's Avatar
        sixgun -
        Click here to enlarge Originally Posted by 427 Click here to enlarge
        Is anyone currently running this tune in their CLS550... if so, may we please have some feedback?
        I have a new 2014 MB CLS 550 with Renntech upgrade
        One word: phenomenal
        Performance over stock is startling
        Much better power band with no rev limiter or top speed governor(factory is 149mph...Renntech is 189 mph)
        Acceleration is superb..pins you to the seat back
        Still, admittedly, some momentary turbo lag, but not as bad as Porsche 911 Turbos I have owned for instance
        Performance is even greater with the CLS when you realize it's a big heavy 4 door coupe, not sedan, as MB refers to it as a coupe due to no center window pillar
        Mid range acceleration 50-130 is incredible
        Very smooth, but tons of power when you need it..or want it!
        I might add that handling is also superb...the huge rear tires make a big difference, but for a big car, the is remarkable..stabler, solid and quick
        I have had many high performance cars and currently also have a Dodge Viper
        which is a different type of fast!
        I chose the CLS over a Panamera...liked the styling better and performance with the twin turbos..engine is just awesome!
      1. 427's Avatar
        427 -
        I'm not certain why a question asked nearly 2.5 years ago has now yielded a negative rep... so be it.

        As for your comments regarding a Renntech tune, I have to agree. They tuned my ECU over a year ago and I wrote a very favorable review (with pre/post dyno results).
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by sixgun Click here to enlarge
        I have a new 2014 MB CLS 550 with Renntech upgrade
        One word: phenomenal
        Performance over stock is startling
        Much better power band with no rev limiter or top speed governor(factory is 149mph...Renntech is 189 mph)
        Acceleration is superb..pins you to the seat back
        Still, admittedly, some momentary turbo lag, but not as bad as Porsche 911 Turbos I have owned for instance
        Performance is even greater with the CLS when you realize it's a big heavy 4 door coupe, not sedan, as MB refers to it as a coupe due to no center window pillar
        Mid range acceleration 50-130 is incredible
        Very smooth, but tons of power when you need it..or want it!
        I might add that handling is also superb...the huge rear tires make a big difference, but for a big car, the handling is remarkable
        ..stable, solid and quick
        I have had many high performance cars and currently also have a Dodge Viper
        which is a different type of fast!
        I chose the CLS over a Panamera...liked the styling better and performance with the twin turbos..engine is just awesome!

        Welcome! Glad to hear your impressions.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by 427 Click here to enlarge
        I'm not certain why a question asked nearly 2.5 years ago has now yielded a negative rep... so be it.

        As for your comments regarding a Renntech tune, I have to agree. They tuned my ECU over a year ago and I wrote a very favorable review (with pre/post dyno results).
        Here's a positive.