• 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. Maverick1975's Avatar
        Maverick1975 -
        Congrats! Nice to know the c63 black will be outrun in a straight line by a garden variety CLS!
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Maverick1975 Click here to enlarge
        Congrats! Nice to know the c63 black will be outrun in a straight line by a garden variety CLS!
        Just the nature of factory twin turbo motors.

        The C63 with boost though will outrun it...
      1. Mort's Avatar
        Mort -
        The CLS550 is rear wheel drive standard, 4 Matic all-wheel drive is optional for the first time on this model in the USA. Looks like the 4 Matic is standard equipment in Canada and part of the reason the base price is $84,500 in Canada vs $71,300 in the US.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Mort Click here to enlarge
        The CLS550 is rear wheel drive standard, 4 Matic all-wheel drive is optional for the first time on this model in the USA. Looks like the 4 Matic is standard equipment in Canada and part of the reason the base price is $84,500 in Canada vs $71,300 in the US.
        Interesting... good info Mort.
      1. Tony007's Avatar
        Tony007 -
        I'd be willing to bet that a RT CLS550 4 matic would take the CLS63 in a flat out street race from a dig due to higher torque to the tires and more available traction from the 4 matic.

        Thoughts?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Tony007 Click here to enlarge
        I'd be willing to bet that a RT CLS550 4 matic would take the CLS63 in a flat out street race from a dig due to higher torque to the tires and more available traction from the 4 matic.

        Thoughts?
        I agree with you but you are talking about a CLS63 with the M156 correct?
      1. Tony007's Avatar
        Tony007 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        I agree with you but you are talking about a CLS63 with the M156 correct?
        Definitely with the M156.. But I think even with the M157 it's a fairly good possibility in a street drag.

        The problem is that on the majority of these f'ing asphalt roads you just can't get any traction.

        Just for grins the other day I did some V-box'ing using the launch control on my ZR1 and the best it would do on a regular paved road is 0 to 60 in 5.2 due to EXCESSIVE wheel spin. I turned that computer crap off and the best I could get under those conditions was 4.3.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Tony007 Click here to enlarge
        Definitely with the M156.. But I think even with the M157 it's a fairly good possibility in a street drag.
        With the M156 yes, the M157 no. The M157 will simply trounce this, stock, modded, whatever.

        Click here to enlarge Originally Posted by Tony007 Click here to enlarge
        Just for grins the other day I did some V-box'ing using the launch control on my ZR1 and the best it would do on a regular paved road is 0 to 60 in 5.2 due to EXCESSIVE wheel spin. I turned that computer crap off and the best I could get under those conditions was 4.3.
        That is mainly the problem, traction. The AWD will make this great in a stoplight battles.
      1. Tony007's Avatar
        Tony007 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        With the M156 yes, the M157 no. The M157 will simply trounce this, stock, modded, whatever.


        Sounds like the new CLS63 is a beast - I need to take one for a spin Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Tony007 Click here to enlarge
        Sounds like the new CLS63 is a beast - I need to take one for a spin Click here to enlarge
        Just look at this: http://www.benzboost.com/showthread....h-Stage-1-tune
      1. blkclk550's Avatar
        blkclk550 -
        $#@! ME !!! this in a 3700 LBS E550 coupe will do some DAMAGE!
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by blkclk550 Click here to enlarge
        $#@! ME !!! this in a 3700 LBS E550 coupe will do some DAMAGE!
        It will be ok.
      1. 427's Avatar
        427 -
        Is anyone currently running this tune in their CLS550... if so, may we please have some feedback?
      1. Sticky's Avatar
        Sticky -
        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 do not know of any poster running this currently but I think one can be very confident with Renntech.
      1. 427's Avatar
        427 -
        Thanx, Sticky... I appreciate the advice.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by 427 Click here to enlarge
        Thanx, Sticky... I appreciate the advice.
        No prob, if you get it let us know.
      1. Dueclaws's Avatar
        Dueclaws -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        I do not know of any poster running this currently but I think one can be very confident with Renntech.
        Thanks Sticky from another '12 E550C owner!
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Dueclaws Click here to enlarge
        Thanks Sticky from another '12 E550C owner!
        Glad to see more of you guys here. The M278 is going to be a lot of fun to tune and a great platform as well.

        Make a thread with some pics of your cars guys!
      1. Dueclaws's Avatar
        Dueclaws -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Glad to see more of you guys here. The M278 is going to be a lot of fun to tune and a great platform as well.

        Make a thread with some pics of your cars guys!
        Can do! Will post some photos later.
        Also, I sent a PM to RENNtech asking for some 0-60 and 1/4 mile data for M278 powered CLS or E (coupe). Don't know if they have it, but we'll see.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Dueclaws Click here to enlarge
        Also, I sent a PM to RENNtech asking for some 0-60 and 1/4 mile data for M278 powered CLS or E (coupe). Don't know if they have it, but we'll see.
        From what I understand, it is coming.