DBSeer

Hello my friends at MBWorld,

I recently was looking into the engines in the W212 (2014/2015) E-Class engines, the E350, E400, and E550 engines. They are all M276 engines, but the E350 lacks the biturbo, these being basically the same engines, doesn't it mean that the M276 is very easy to install a turbo in? If so, what kinds of limits to turbo size/boost pressure are best to abide by? Are there any turbo kits out there made for the W212 E350?

juanmor40

For clarification:
1 - E350 -> M276 3.5L
2 - E400 -> M276 3.0L quite different intake than the E350
3 - E550 -> M278 (not M276)

By reading all the issues with tuning even the stock engines, attempting to upgrade the NA -> Turbo version will be costly and painful to tune properly. It will be a great enthusiast project to stay busy, but to get it optimal, it will take time and $$$

You could give a shout to the existing 3rd party tuners, and see what they recommend and if they have done it already. If so, it will save you a lot of time. For example, https://www.torquecars.com/mercedes/m276-tuning.php

DBSeer

Thanks for the clarifications, I'll make sure to look closely at the information next time

Jplusnic

I would not attempt to turbocharge a m276 de35 and expect it to run on pump gas. The compression ratio is 12.2:1 as compared to the turbocharged version which is like 10.6:1. The lower compression ratio allows for more boost at the given octane rating without having detonation issues. Turbocharging your e350 may be possible but with factory fuel and internals you would be running less than 5 psi. The short answer is that I wouldn’t. There aren’t kits available because it’s not a commonly done thing for that reason.

W205C43PFL

There is a version that is from factory: https://mbworld.org/forums/e-class-w...ml#post8383906

It is not sold in North America, if OP really wants to install turbo on the 3.5L, could probably look at the differences between the 3.5L turbo and the 3.0 turbo and see what was changed.

juanmor40

hopefully the above is correct

W205C43PFL

Thanks for posting the information, if wikipedia isn't correct, hopefully the sources/references at the bottom that it is based on/cited is accurate.

SteveE400

Well, I'd say that in the US, that info is NOT correct. My 2015 E400 4Matic sedan is most definitely the M276DELA30, or the 3.0l V6 engine.

I bought it new, and all documentation indicates 3.0l engine.

Now I do not know the situation for vehicles produced for and sold in other parts of the world.