AGREE! I just had mine done, definitely worth every penny, much more responsive, one more happy customer. Thanks Cory!

 

Do you guys think it would be worth it on my 350? The hp and torque increase is nice, but the throttle response is what I am hoping would improve the most. I think its 700$

 

I'm pretty sure it's the same price, but a lot of people seem to like the improved throttle response.

 

I had my E350 Coupe tuned by Jerry @ Eurocharged. HP went from 302 to 327 Hp 330 torque at a cost of $699. Great tune for the money..highly recommend Eurocharged.

 

Eurocharged is one of the companies that offers one of the laughable retunes for the detuned M276. I've asked them about it via email and posting in threads and they have never responded. They claim 10-15 horsepower on a 2013 C300.. lol

 

This is great! I wish I had another ECU or another vehicle so I could send mine down without being without a vehicle for a week or so!
Is there any danger of there not being enough air as my C300 only has one air intake compared to a C350 having two.

 

They both actually have only one, the only one with two is the C63, but it looks like they all share the same part, with a blocker on the one side.

Looks like only pre-facelift C350s have dual air intakes.

 

48 hour turn around time on the ECU shipping and tuning. I like it thus far and it was worth an upgrade BUT am and finding it hard to believe the claim of 320hp. I would have to drive a C350 to truly compare.
You would think that 20% or more increase in power would be extremely noticeable.

 

I have a 2013 C300. Sent my ECU to Kleemann Wednesday night and they got it Thursday. I received it back on Friday at 10 am. I was without the car for one day.

Now, to give my review: First, I have never modded any car, ever. It kind of pissed me off that we had the same engine as the C350 except for electronic tuning. I came from an Infiniti G35 coupe. The difference between the Infiniti and the C300 could best be described as having a hair-trigger gas pedal(G35) and driving a dump truck (C300). Since I bought the C300, I had a hard time driving the G35 without slamming my head into the headrest at every start. Both cars were comparable in speed, the C300 just felt slower because of the pedal lag.

I was out of town until yesterday, Sunday, so I put the ECU back in and drove around town. The lag was very noticeably better. I did some heavy acceleration 0-70 runs and shifts were crisp and it pulled really well. This morning, I did the usual workday routine. The car is effortlessly accelerating with much more throttle response. That lag is gone. I don't know if it is just wishful thinking, but I could swear that I don't have to push the pedal as far to maintain speed. I'm just barely touching the pedal. When I need to accelerate, the response is instantaneous.

Finally, with only one morning of comparison with my daily commute, I would say the gas mileage is very similar before and after. If you accelerate the same as before the upgrade, you will have the same mileage. If you accelerate faster, because it is more fun or because you can, your mileage will suffer. The problem is that, because it takes a lot less effort to accelerate faster now, it will be harder to keep the same gas mileage. I am not complaining!

I recommend the upgrade.

 

Does anybody have any idea if the car gets taken in for a sw ECU upgrade will this Kleeman upgrade sw be overwritten by the new one?

John

 

Thanks for the heads up Cassman. Where abouts are you located that you got it there and back so quickly? Unfortunately, I'm across the northern boarder, so I'm not so sure that I would actually get it back quite that quickly.
What is it like to get to the ECU? Most I've ever done is a CAI and throttle body on a Grand Am...so I'm in new territory here...

 

Pull off the front of the engine cover - it pulls right up. You will see two connector covers on the right side of that cover before you pull it off. The ECU is under those. The ECU is aluminum and has a black plastic guard. I called Kleemann and they walked me through taking it off. It took about 2 minutes. Putting it back on was even easier since I knew how it came off.

I live in Illinois. I overnighted the ECU via FedEx. They overnighted it back. Simple.

 

I just received a response from Kleeman to your question. They stated that, if a dealer update caused me to feel that the power went away, they will reprogram it free of charge except for shipping costs.

 

Just saw this thread, what would be the benefits mainly in HP, GPH, reliabilty, ect, in installing the Kleeman ECU reflash on a 2009 C300 Sport ? Thanks for any suggestions.

 

Correct, so be aware that ANY time a dealer does an upgrade on your car, you will have to resend the unit back to them.

This is the only thing i do not like about this sw upgrade. There is a bulletin for all 2013 C Class 4Matic LI07.08-P-056245. Apparently there is a new sw update for the MU control unit.


The TSB mentioned above is for a fault code related to “Implausible data received from control unit “transmission”, stored in engine control unit.” The fault code is U040208. This fault basically says the ECU has received implausible data from the transmission control unit. It is a transmission signal being sent from the gearbox controller to the ECU.


John

 

I'm looking for this upgrade as well.. I found a Kleeman dealer in Houston, TX. One question is how does this affect warranty?

 

Technically it would void it, but it's unlikely that a dealership would have the expertise to examine firmware. Do you have a 2013?

 

Nope I have a '09 with an extended warranty

 

Most of the information in this thread is about the '13 with the direct injection 3.5L (M276) engine. The '09 has the 3.5L non-DI (M272) engine. So the power increase won't be 50+hp, but you'll still end up with >300hp.

 

Thanks for the info. That's what I'm looking for. It's a commuter car so it'll be a better drive and throttle response.

What's the price range on the k1?

 

Does anyone know of any tuner besides Kleemann that does this yet? It's getting pretty pathetic that there is no competition. I'd gladly pay the $1300, but geez, you'd think that Mercedes is paying off the smaller tuning companies to release 10-15HP tunes in hopes of keeping artificial class differentiation between the C300 and C350...

 

MPower in Houston, TX is giving me a pretty good deal on ECU with exhaust upgrades and smaller tunes. It'll give me close to 50 HP. Try and find a reputable tune shop and get better air intake filters and exhaust tunes. Not too much of an improvement but it will make the drive better lol.

 

I feel like this thread is full of misconceptions... I don't think you're talking about the same engine as I am.

 

I don't know if it's a misconception, or a lack of clarity between what can be done to each engine...whether the M272 or the M276. It took me a long time to sort through the crap just to get a clear idea of what can be done.
Judging by the other 'tuners', it seems that a max increase of 15-20HP is the most a '13 C350 will get from anyone as this is its performance max without doing other things like headers and down pipes and such.
Suffice it to say that the $1300 or so for the Kleeman K1 tune is really the only viable choice for the C300...you're just not going to get a big enough increase on the C350. But from what I've seen, they are the only ones that give a target hp for the engine, rather than just a vague increase and enhanced throttle response from all the other offerings...

 

Not trying to be rude, but there is a couple different kinds of posts that keep popping up... People with 3L M272s saying it's impossible for a C300 to be tuned to 300hp, with no idea what an M276 is, People with 3.5L M272s looking for information in the wrong place, and People who flat out refuse to believe a 70 horsepower tune is possible, ignoring the circumstances surrounding the 2013 C300 with the M276.

So for those still confused, we're discussing the 2013/2014 C300 with the 3.5L M276 DETUNED engine with 248hp and it's capability to be tuned to ~320hp. Not the 3.5L M272 in pre-facelift C350s, not the 3.0L M272 in the pre-facelift C300s.