Amen brother!

I own a 2012 c300.... 3.0L M272 right???
My question to you guys is, how much HP and torque would I gain with this tune? Also, is it just a matter of disconnecting the ECU, ship it to Kleemann, they send it back, put it back and that's it??? not extra parts or wiring needed??? And finally, what is the cost for this? I saw $1300 somewhere?? :nix:

I guess my main goal here is to get quicker response with the gas pedal lol

Thank you in advance!

You will gain no power, because the tune isn't for your engine. There is considerably cheaper tunes for the M272, and almost every tuning company has one.

ok thank you!!.. all I needed to know lol

some of the posts almost seem like plugs for kleeman...is there a general conclusion that you can get 330hp and 300lb/ft out of a 2013 c300 4matic?

No. There has been 4? people claiming to have tuned their M276 in this thread, but no dyno yet. The conclusion is that you can get greater than 2013 C350 power from a 2013 C300 with a tune.

There's something about this claim that doesn't make sense to me. Kleeman's hp claims are at the crank, not the wheels, right? Kleemann claims up to 330 hp on a m276 tune, at the crankshaft. MB stock c300 claims 248 hp at the wheels. If we assume a 15% loss due to the driveshaft (between the crank and the wheels), that 330 hp turns into 280 hp at the wheels, and that is 22 hp less than the 302 hp for a 350. Is 15% a fair assumption?

I'm a little nervous about warranty issues depending on how obvious the tune would be. If MB hooks up star diagnosis, will it tell them that the ECU has been altered? Or would they have to specifically pull the ECU to tell? Is there a flash counter on the ECU?

I did the tune. Pretty damn confident that I'm no where near 300hp. I had the chance to drive a stock 2013 and then mine. MAYBE a 20hp difference. Not super impressed, mostly because I was guaranteed by Kleeman 300-320. When I emailed my thoughts to Kleeman I received no response.

That's really disappointing, I had no idea yours was that bad. I think I'll have to reconsider my plans of getting this done, unless kleemann comes out with some sort of guarantee, because there is still no official info about it on their website, and this car/engine has been out for a long time.

@WhyAskWhy
The only claim kleemann has made is 330hp for a C350 tune. If you factored in drivetrain loss on that you would net less than MB claimed horsepower on a C350 (306). It doesn't make sense that kleemann would offer a tune that decreased power for $1400. The only thing that doesn't make sense here is that C300s are (apparently) not getting the same power, even though they are mechanically the same car.

Kleemann ECU Re-mapping - 2 thumbs up!!
 

After searching this forum, Renntech and Kleemann seemed to be the most common positively reviewed tunes. With the former at $1,295 and latter at $795, I went with Kleemann for my 2009 C350 Sport.

One Kleemann dealer quoted me $1,195 and another $795 plus $95 labor, both plus 10% tax. I called Cory and found you didn't have to go through a dealer.

I found easy instructions on this forum for removing the airbox and pulling the ECU (a 15 minute job for a first-timer). I overnighted it to Kleemann in Colorado Springs. They shipped it back the same day. I put it back in (now a 5 minute job).

The car fired right up and all I can say is it was totally the right thing to do and worth the time and cost. Throttle lag is gone, when you punch it it really takes off and responds well at low speed or freeway and climbs to 6,000 rpm effortlessly.

I'm not interested in a street racer, just a high-performing sedan and the Kleemann ECU re-mapping was just the ticket. I am a happy camper.

BTW, if Mercedes should have a SW upgrade for the ECU and the re-map is over-written, Cory said they would do a re-map for the upgrade for $150. And if you ever want to return it to stock (though I can't understand why anyone would), they save the original ECU file and can restore it.

Your engine is an M272. This thread is about the M276 engine. Having said that, I'm glad you felt the tune was worth it. Also, it's good to know that they can flash back to stock in case there is major warranty work that is needed.

From my perspective, it's hard to spend $1,295 on an ECU tune that can void the warranty unless it really makes a great improvement in performance. Maybe in the future if they run a special like they did with the M272, I'd consider it.

I'm going to have to wait Kleemann releases some official numbers and guarantees for the M276 in the C300. Probably that and a price cut will convince me to tune my M276.

I think Kleemann's is opening back up tomorrow (their website says they were closed for 2 weeks for the holidays). Hopefully Corey will chime in. I'll send him a PM.

^ that is correct. And I have already received a response from Cory (much appreciated).

I will keep posted on a resolution or if I was completed incorrect in my testimony.

Thanks.

I don't meant to hijack this thread and if it is not appropriate I apologize.

Since you are on the subject of tuning I was sent this by a friend.

http://oetuning.com/blog/?tag=c300

Looks like you can get the unit and flash your own stuff without sending it in.

I have no used it or have any knowledge of its results but figure I would post for those seeking options.

Might be nice to flash it back to stock for those warranty repairs. :)

The M276 is not tuneable via handheld OBDII tuners, bench flash only. The article doesn't make it very clear. However, that tune will work on the 3.0L M272 in your 2012 C300.

OETuning's ECU flash for the M276 is a bench flash and claims +12 hp/10 lb-ft of torque.

Yeah. Pretty weak. I hope Corey can post here and clear some things up.

Did you get any additional followup from Cory?

Hmmm...I think you may be looking at the more conservative GDI tune. There's 3 tunes for the M276 OE Tuning offers. Realistically you are looking at +23hp/+23 lb-ft torque increase with the OE tune.


Model C350 GDI 3.5
Series W204
ECU MED17.7.x
Year 2011-
Stock Peak HP 302
Tuned Peak HP 314
Stock Peak 273
Tuned Peak Torque 283

Model C350 GDI 3.5
Series W204
Year 2011+
Stock Peak HP 302
Tuned Peak HP 329
Stock Peak 273
Tuned Peak Torque 295

Model C350 3.5
Series W204
ECU MED17.7.x
Year 2012
Stock Peak HP 302
Tuned Peak HP 325
Stock Peak 273
Tuned Peak Torque 296

+23hp/+23tq over what? Our M276s are outputting 248hp. This thread is about C300s.

Edit: This is what we are talking about: http://oetuning.com/mercedes-benz-c300-3-5-gdi.html

Ah....then yes, I completely understand your frustration. On 1 hand, OE-Tune defines stock and tuned power and purposely have a separate tune for both models...whereas with Kleemann, you are pressed to believe 1 tune fits all (which by what I have read so far, I'm not convinced is true).

I've been following this for several months, and there has been very little advancement in what we know about the detuned M276. Kleemann and this thread initially made it sound very clear cut, they're the same engine, same power.
In addition, not one tuning company has explained the difference between the M276 in the C300 and the C350 (If there even is one). I've asked several, and have received no reply. Hopefully MrMeth got some information from Corey.

I've been following this thread as well. But if the above claim is true, why not go for the tune I originally listed above (albiet the description says C350) where tuned peak HP/TQ were clearly listed?

Also, if there were mechanically identical, why would more than 1 tuning company offer separate tunes for each? I'm honestly hoping the best for you, however a big a part of me feels it's similar to holding on to a dream.

I talked with Cory, and he confirmed that the engines are 100% mechanically the same, in displacement, compression ratios, etc. The only reason numbers aren't available is because Cory doesn't have access to a AWD dyno, and doesn't want to throw around arbitrary numbers.
I'm confident that the tune gets you beyond C350 power. Cory responded to me within an hour with a very detailed email, citing many happy customers, and only one so far who did not get the power he expected. OE hasn't replied at all regarding why there is a difference between tunes for 2013+ C300s and C350s. Something weird is going on there.
My money is with Kleemann this summer.