munis

Does anyone know anything about this?

Also does anyone know, if all the internal parts for the engine between these two cars are the same? Like did they beef anything else up for the larger turbos on the E43 engines?

alexasa

iTrader: (1)

not sure what the benefit of that would be, unless you're trying to push huge power.

there is plenty of headroom with the current turbos and they should, theoretically spool faster and give you more area under the curve when tuned.

Looks like it's a only a HP bump from the C43 stock vs stock while torque numbers remain SIMILAR.

CanadianLP

I would say that it might be of interest if you want more top end HP. The trade-off is that the max torque is around 2500RPM instead of 2000RPM.


So HP or torque? Pick your poison!

alexasa

iTrader: (1)

The cost would not justify the change, IMO.

And if you are truly chasing big power, this is probably not the best way to do. Especially when considering cost/performance (unless an aftermarket company builds a kit).

Gungaslow

If you're gonna do that may as well put gtr turbos in there

Bueller178

Sounds expensive.

tmoneyC450amg

Uhhhh...why not buy a C63 or a E43???

sean1.8t

That is probably due to tuning. The E is most likely tuned for a longer/smoother tq curve whereas the C is tuned to have more of a push to it. Bottom line: Bigger turbos (I would guess only slightly larger turbine housings/wheels) = more power potential. OEM tune numbers are insignificant.

These 3L's are already spooling these turbo's at basically idle. I doubt that the slightly larger E turbo's would make a huge difference. Certainly wouldn't have to "Pick your poison." The E does have the same size engine after all

I'd agree...IF you want 600+AWHP. But then you'll most likely have to start upgrading rods at the minimum. But maybe not as no one knows what is in these 3L's and I wouldn't be surprised if the internals are forged well enough to handle 6, 7, maybe even 800ft/lbs tq. But getting the heads to handle revving out to ~8k rpm's....That's a different story. Usually an expensive story.

Swapping in a slightly larger OEM designed turbo would be cheap and would take away the tq spike we get down low and could shift the power curve up a bit in the rev range as well as add ~50hp without stressing the turbo's.

But on that note, I doubt we're stressing the turbo's as of yet. I believe that OE/AMR's tunes only, and correct me if I'm wrong, push like 13-14psi; that is certainly not stressing these turbo's. Not even close.

What isn't on these cars?

One is RWD. The other is a larger and heavier vehicle all around.



Whew!

I've been waiting for these types of threads! I'd love to keep this car after lease end if the aftermarket has advanced enough. So far, it's slim pickins...

NYCSoiL

$70,000 for the C43
$5000-8000 for 2 turbos
$3000 labor
$2500 custom tune+dyno
$N intercooler
etc
etc

Why not just buy a Tesla for this amount of money? Or any other car that tuner friendly.. C43 is not a tuner car..

chutak

Parts lookup says the turbos and pistons are different between the E43 and C400/450/43. However, wastegate control valve and turbo oil lines are the same. Everything else appears to be the same for engine internals as well (cyl head, valves, springs, rods, oil pan, etc).

E43 turbos seem to be a straight bolt-on, although expensive ($4400). Hopefully, an aftermarket company, like Pure Turbos, will develop an M276 turbo upgrade path for more power and cheaper.

munis

Interesting that the pistons are different. May be they beefed it up a little bit.

sean1.8t

What is each engine's compression ratio?

chutak

It's the same 10.7:1 CR.

So just to clarify, it's actually the piston assembly part numbers that are different...which consist of the rings, wrist pin, and piston. If any one of those parts are different then the part number for the whole assembly should change.

I suppose it's possible for Mercedes to have just changed rings while keeping the same piston to free up a tiny bit of power.