Hey,

Does anyone have any (preferably official) information about difference between the M276 in the 2013 C300 and C350? I've heard ranges from it being all software, to the difference being deeply mechanical (port sizes, quality and strength of materials). Does anyone know?

Thanks

 

The big difference for MY2013 is the eco start/stop function

 

I'm not really concerned with the differences between the M276 and engines in <2013 C's, but the difference between the M276 in the 2013 C300 and 2013 C350.

 

Looking here: http://en.wikipedia.org/wiki/Mercedes-Benz_M276_engine underneath specifications it says there is only one version with a displacement of 3.5 litres. This leads me to believe the C300 uses a different engine? Perhaps the older M272? http://en.wikipedia.org/wiki/Mercedes-Benz_M272_engine check under the "E30" section.

 

The 2013 C300 4Matic uses a detuned 3.5L CGI M276 engine with direct injection. This is clearly stated in all MB websites worldwide where the C300 4Matic is sold. However, China still offers a C300 with the 3.0L M272 engine.

 

Would the detune be software only and or different heads, for example?

 

Rumor has it that the detune to 248 HP and 251 lb-ft torque (from 302 HP and 273 lb-ft) is all ECU programming. Many have speculated that this engine can be retuned to full spec.

 

That would be awesome.

 

I'm a bit anxious because no one has offered a tune yet, and it's been nearly a year. You would think if it was as simple as a retune, it wouldn't take this long.

 

We have a tune available for your car: http://oetuning.com/mercedes-benz-c300-3-5-gdi.html

Feature of the tune include:

- Ignition and Fuel adjustment
- Speed limiter removal
- Improved throttle response
- Raising Torque limits

Gains are +12Hp & +10Tq. On SALE this month for $556, ECU send in only.

 

Maybe a tuner can give me some insight. Why isn't there +50hp and +20Tq gains, if it is the same engine as the C350?

 

I'd be interested in this as well, especially since Kleemann's C350 tune for the M276 is completely compatible with the C300 ECU.

 

We are looking for a local SoCal car to show dyno results for >2012 C300 GDi.
Please PM for the full details of the deal. Only 1 car needed.

 

Is it possible Mercedes is trying to limit the power and torque going through the W204's 4matic system?

 

I think that's unlikely because you can configure a C350 coupe with 4matic as an option.

Also, I found this on Kleemann's website:
Will the 7G-tronic be able to handle the power of a Kleemann tuning solution? Back to top
The 7-speed 7G-tronic transmission (722.9) has now replaced the most of the 5-speed (722.6) transmissions Mercedes Benz used since 2000. All new N/A V6 and V8 vehicles are now being built with the WA700 variant of the 7G-tronic. The WA700 variant is endurance load rated by Mercedes Benz at 760 Nm (560 lbs/ft) of torque. This means the transmission will handle this amount of power continuously with out failure. There will never be a time where one can develop this kind of power continuously on the road. Momentary load ratings are easily 35 % higher than continuous ratings, and the 7G-tronic transmission will easily handle the performance from a Kleemann conversion. The 7G-tronic has been available since 2004, and Kleemann has modified many of these vehicles. None of these modified vehicles has had any trouble to date, many of them having logged in excess of 64000 km (40000 miles).

http://www.kleemann.dk/About/FAQ#faq05

 

Bumping this thread. Anybody get anywhere with this? I saw another thread similar to this offering a tune for $1300. All subsequent posts could not provide any real data.

 

Didn't bother reading the posts but the only difference is that the c300 is electronically detuned. An ECU tune will bring it up to c350 spec and then some. (~330hp).

Eurocharged is a good option and I'm sure OE tune has sorted theirs out as well.

 

Yeah I'm aware of the difference/similarity of the m276 in the my13 and my14 c300's and c350's. I'm just wondering if anyone has actually got provable results. I checked out a company called Bren Tuning. They have a video of a 3.5L c300 4matic with baseline results. I've contacted them for some more info, waiting for reply.

 

Does C300 version specify regular gas? That could be a part of the difference since C350 requires premium to make rated HP.

 

The 2013 C300 does require high octane pump gas. 100%
Pretty sure most all modern MB motors do, in U.S. spec. Europeans have higher standards of petrol than we do so when their engines are designed they are designed with a minimum octane rating, which is typically standard pump gas over there but mid grade/premium over here. There's a lot of info out there regarding this. The consensus is that the m276 engines in 2013 and 2014 c300's are identical ( so far I can verify that bc every part I've needed I had to get was the same as the c350 ) and it's just a factory "de-tune" done to the ecu that makes them differ. The problem is, I've searched ad nauseam and have not found ANY verifiable numbers. Not from customers or the various tuners that offer the service to these very specific engines.

 

Upon further research I can verify that the c300 spec m276 only delivers up to 80% throttle max. This makes sense as this is what they have done to AMG engines in the past, specifically the shared 6.2L/6.3L motor. OE gave me some #'s as well. The claimed 330hp is at the crank. Through much siphonning from the torque converter, trans, transfer case, WHP gains are seen around 15hp.(and probably somewhere near the claims of 300-330 at the crank but, who does that?) Doesn't seem significant but it is. The throttle response is the real culprit.

I want this thread to come back to life! I love my c300. I just want a little more from it and mainly because I know it has the easily realized potential to do so!

 

I actually wrote to OE a month ago asking for a small price break (summer sale price would be great since I missed that window) and in turn I would Dyno my '13 C300 sport 4 matic before the tune and then after. I offered to film (I work on TV shows and am a photographer) and document each step of the process and post the results and short movie on the forums so this question can be put to bed. In response I got a "we dont do sponsor deals (not what I was looking for but ok) and the tune may go on sale later in the year again. That was it. They didn't seem the slightest bit interested in settling this matter or providing any data to show the numbers.. I too cannot stand my 300 lack of get up and go. I'd buy it tomorrow if I knew the numbers they claim are real or not. Sigh....

 

The m276 is the same

 

I actually went through the process of cross referencing all the internal engine parts from a 2013 c300 4matic sport and a 2013 c350 4matic. All parts have identical pn's only difference is the exhaust tubing. And I'm guessing that is only bc the 350 is a coupe.

 

Correct