• 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 -
        Click here to enlarge Originally Posted by Dueclaws Click here to enlarge
        By the way, the guy who installed the RENNtech tune (post #40 above) got interested in the tune after I posted the RT press release at another site. I learned about it on this site: so chalk one sale from Benzboost (and me).Click here to enlarge
        Click here to enlarge Happy to hear that. Try to refer M278 guys here!
      1. 427's Avatar
        427 -
        Before I choose a tuner for my CLS550 4Matic, I'd like to be educated as best as possible. I wish there was more info/feedback from RENNtech within this thread... as well as current uses with the M278 tune. I've tried calling and emailing RENNtech directly, but they seem elusive and/or unwilling to answer some simple questions. Since I don't race, I'm only interested in everyday street characteristics. Is it too much to ask, "What should I expect with my purchase?"

        Sticky- Perhaps you can find out the following:
        a) Is the street drive-ability compromised in any way?
        b) What about the slight turbo lag I often experience at light throttle... can that be eliminated?
        c) Are the transmission shift points altered in either the economy or sport mode?
        d) Is the speed governor eliminated (not that I will ever test that feature)?
        e) How is the fuel economy impacted?
        f) Have free flow air cleaners been tested with this tune... do they recommend them?
        g) Why do they list all the M278 engines with the same power when the factory rated them differently?
        h) Are more tune updates in the works... what about vehicle accessories?

        Anything else they could mention for features would be appreciated... I'm just trying to learn exactly what to expect.

        Thanx,
        427
      1. Dueclaws's Avatar
        Dueclaws -
        427
        Here's the response to some of your questions from the owner of the '12 E550C with the RENNtech tune.
        The others would be RENNtech's to answer.

        a) The most noticable change was the throttle tip in, seems more immediate and almost exaggerated in sport mode in normal mode it as you might expect. But to answer directly the change, to this point hasn't negatively impacted day to day driving. Except to say maybe a bit more fun.
        b) As to turbo lag, it's probablly as responsive as possible and still have a turbo. I am suspect of someone that tells me they have a performance turbo and has "no" lag. Lag is part and parcel to the turbo.
        c) I don't believe the shift points have been altered, could be wrong but don't think so.
        d) Also believe the speed governor/rev-limiter are still intact, as they would tie directly to warante implications.
        e) As many have stated, the mileage might be a bit better but dip into the throttle a bit more so it's probablly a wash. But certainly no losses.
      1. 427's Avatar
        427 -
        Dueclaws - THANX for the feedback... would love to hear from others too!
      1. Dueclaws's Avatar
        Dueclaws -
        Happy to help!
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by 427 Click here to enlarge
        Before I choose a tuner for my CLS550 4Matic, I'd like to be educated as best as possible. I wish there was more info/feedback from RENNtech within this thread... as well as current uses with the M278 tune. I've tried calling and emailing RENNtech directly, but they seem elusive and/or unwilling to answer some simple questions. Since I don't race, I'm only interested in everyday street characteristics. Is it too much to ask, "What should I expect with my purchase?"

        Sticky- Perhaps you can find out the following:
        a) Is the street drive-ability compromised in any way?
        b) What about the slight turbo lag I often experience at light throttle... can that be eliminated?
        c) Are the transmission shift points altered in either the economy or sport mode?
        d) Is the speed governor eliminated (not that I will ever test that feature)?
        e) How is the fuel economy impacted?
        f) Have free flow air cleaners been tested with this tune... do they recommend them?
        g) Why do they list all the M278 engines with the same power when the factory rated them differently?
        h) Are more tune updates in the works... what about vehicle accessories?

        Anything else they could mention for features would be appreciated... I'm just trying to learn exactly what to expect.

        Thanx,
        427
        A lot of these were answered but let me answer what I know. Also, paging @m54b25

        a. no, it should be better with increased torque.
        b. that is likely a function of having a turbocharged motor but throttle response can be changed.
        c. don't think so
        d. yes
        e. heavier foot, it will go down.
        f. freer flowing filter will only help.
        g. just likely to save time and a small oversight.
        h. yes, more tune updates in the works and accessories.
      1. m54b25's Avatar
        m54b25 -
        Sticky points are well noted. The M278 4.7L V8 Biturbo with a tune will actually perform better all around with the increase torque. Usually customers with heavier 4matics such as S, ML & CL class will be notice a great initial drive dynamics acceleration increase from stock. It will be comparable in performance acceleration of similar AMG63 class w/o PP biturbo cars. Some other points:

        1) Fuel economy will remain same if you can drive the same way after the tune.
        2) Speed limiter can be raised upon customer request
        3) Transmission adaptation shift points remains same in Comfort or Sport mode.
        4) Tune are available with optional high flow kat downpipes, and/or modified ECO mode stop start at no additional charge.

        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        A lot of these were answered but let me answer what I know. Also, paging @m54b25

        a. no, it should be better with increased torque.
        b. that is likely a function of having a turbocharged motor but throttle response can be changed.
        c. don't think so
        d. yes
        e. heavier foot, it will go down.
        f. freer flowing filter will only help.
        g. just likely to save time and a small oversight.
        h. yes, more tune updates in the works and accessories.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by m54b25 Click here to enlarge
        Sticky points are well noted. The M278 4.7L V8 Biturbo with a tune will actually perform better all around with the increase torque. Usually customers with heavier 4matics such as S, ML & CL class will be notice a great initial drive dynamics acceleration increase from stock. It will be comparable in performance acceleration of similar AMG63 class w/o PP biturbo cars. Some other points:

        1) Fuel economy will remain same if you can drive the same way after the tune.
        2) Speed limiter can be raised upon customer request
        3) Transmission adaptation shift points remains same in Comfort or Sport mode.
        4) Tune are available with optional high flow kat downpipes, and/or modified ECO mode stop start at no additional charge.
        Thank you.
      1. Dueclaws's Avatar
        Dueclaws -
        Thanks!
      1. Dueclaws's Avatar
        Dueclaws -
        @m54b25

        Does RENNtech sell the highflow kat downpipes?
        Thank you.
        Due
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Dueclaws Click here to enlarge
        @m54b25

        Does RENNtech sell the highflow kat downpipes?
        Thank you.
        Due
        I think those are in the works still.
      1. Dueclaws's Avatar
        Dueclaws -
        OK: thanks!
      1. 427's Avatar
        427 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        a. no, it should be better with increased torque.
        b. that is likely a function of having a turbocharged motor but throttle response can be changed.
        c. don't think so
        d. yes
        e. heavier foot, it will go down.
        f. freer flowing filter will only help.
        g. just likely to save time and a small oversight.
        h. yes, more tune updates in the works and accessories.
        Sticky - I appreciate your response and assistance in reaching out to RENNtech... this is all very helpful.
      1. 427's Avatar
        427 -
        Click here to enlarge Originally Posted by m54b25 Click here to enlarge
        Sticky points are well noted. The M278 4.7L V8 Biturbo with a tune will actually perform better all around with the increase torque. Usually customers with heavier 4matics such as S, ML & CL class will be notice a great initial drive dynamics acceleration increase from stock. It will be comparable in performance acceleration of similar AMG63 class w/o PP biturbo cars. Some other points:

        1) Fuel economy will remain same if you can drive the same way after the tune.
        2) Speed limiter can be raised upon customer request
        3) Transmission adaptation shift points remains same in Comfort or Sport mode.
        4) Tune are available with optional high flow kat downpipes, and/or modified ECO mode stop start at no additional charge.
        Excellent feedback... thanx for stopping back and keeping us updated!
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by 427 Click here to enlarge
        Sticky - I appreciate your response and assistance in reaching out to RENNtech... this is all very helpful.
        No problem, I'm here to help.
      1. 427's Avatar
        427 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        I think those are in the works still.
        Do we have any ETA's/guesses as to when the accessories might be released?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by 427 Click here to enlarge
        Do we have any ETA's/guesses as to when the accessories might be released?
        I would only be speculating, you have to ask @m54b25 for something concrete.
      1. 427's Avatar
        427 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        I would only be speculating, you have to ask @m54b25 for something concrete.
        Thanx, Sticky. I'll be giving RENNtech another call shortly, but I want to run a base dyno first. If all goes well, I should have some free time at the end of the month and hope to get that accomplished.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by 427 Click here to enlarge
        Thanx, Sticky. I'll be giving RENNtech another call shortly, but I want to run a base dyno first. If all goes well, I should have some free time at the end of the month and hope to get that accomplished.
        Yes, get a baseline.
      1. Dueclaws's Avatar
        Dueclaws -
        Click here to enlarge Originally Posted by 427 Click here to enlarge
        I'll be giving RENNtech another call shortly, but I want to run a base dyno first. If all goes well, I should have some free time at the end of the month and hope to get that accomplished.
        Click here to enlarge