C300 with c350 engine
#26
Indeed you are correct, i wasn't aware about the 3L having a higher compression compared to the 3.5. It did run fine with the stock 3L ECU with no error codes but I did change the engine setting in Xentry, there is an option that allows you to put whatever engine you want, it didn't change the way it drove.
As for the paddles, every w204 has the wiring and connectors from factory, for some, they just plug it in and it works and others like myself, requires coding. The problem is the factory paddles will act like your tiptronic and show as D1-D2-D3 ... I was lucky enough to find someone that was able to program the transmission and give me Manual mode, probably the best thing I ever did to my car since I always drive it in manual mode now. The shift speeds are night and day compared to the tiptronic/normal paddle setting. I just had to sacrifice my Comfort option so now when I press the C/S button on my shifter, I only have Manual mode or Sport.
As for the paddles, every w204 has the wiring and connectors from factory, for some, they just plug it in and it works and others like myself, requires coding. The problem is the factory paddles will act like your tiptronic and show as D1-D2-D3 ... I was lucky enough to find someone that was able to program the transmission and give me Manual mode, probably the best thing I ever did to my car since I always drive it in manual mode now. The shift speeds are night and day compared to the tiptronic/normal paddle setting. I just had to sacrifice my Comfort option so now when I press the C/S button on my shifter, I only have Manual mode or Sport.
#27
Super Member
Thread Starter
#28
Member
Damn you... I've wondered about exactly this swap.On paper, the swap should seem a non-issue. Your experience would support that statement. The one and only issue I wonder about would be fuel. With the additional displacement, additional fuel would seem likely. However, this can be achieved as easily as adding higher flow injectors. I have a 2005 Mazda 6 with the 3.0 V6. A couple of individuals have swapped to the 3.5 block from the later Fusion. They have swapped to higher flow injectors and have not experience any AFR issues.
Any chance you've checked AFR? Either through something as simple as a ScanGuage, or through a wide band sensor?
Any chance you've checked AFR? Either through something as simple as a ScanGuage, or through a wide band sensor?
#29
Super Member
Thread Starter
Damn you... I've wondered about exactly this swap.On paper, the swap should seem a non-issue. Your experience would support that statement. The one and only issue I wonder about would be fuel. With the additional displacement, additional fuel would seem likely. However, this can be achieved as easily as adding higher flow injectors. I have a 2005 Mazda 6 with the 3.0 V6. A couple of individuals have swapped to the 3.5 block from the later Fusion. They have swapped to higher flow injectors and have not experience any AFR issues.
Any chance you've checked AFR? Either through something as simple as a ScanGuage, or through a wide band sensor?
Any chance you've checked AFR? Either through something as simple as a ScanGuage, or through a wide band sensor?
I never hooked up a wideband sensor to check the fuel ratios, the ecu must know how much fuel to put. The fuel system, including the injectors, are the same on all m272s. Changing the engine settings on Xentry is simple but I did not notice any difference when I did so, I drove about 1500km before so.
#30
Member
I never hooked up a wideband sensor to check the fuel ratios, the ecu must know how much fuel to put. The fuel system, including the injectors, are the same on all m272s. Changing the engine settings on Xentry is simple but I did not notice any difference when I did so, I drove about 1500km before so.
#31
Super Member
Thread Starter
I may need to do look at doing this... I have a 2011 Sport 4Matic I purchased from my brother last fall. Good news- still at just 51,000 miles. Bad news- occasional blue cloud at start-up. Installing new valve stem seals myself would seriously be about as much work at swapping engines. And I am sure as hell not paying someone $1500-2000 to swap the seals for me.
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karlt10 (11-27-2020)
#32
Member
That has been the 'Well.....' factor in all of this. With the craziness of the past 7 months, I have been working from the dining room table. The car sees use, but not Mon-Fri regular use. There are days where the car is only started to move from the garage so I can drag out the woodworking tools to build items for my Etsy shop. I've absolutely wondered about/noticed it is impacted by 'Being started' vs 'Being driven' cycles.
#33
Super Member
Thread Starter
That has been the 'Well.....' factor in all of this. With the craziness of the past 7 months, I have been working from the dining room table. The car sees use, but not Mon-Fri regular use. There are days where the car is only started to move from the garage so I can drag out the woodworking tools to build items for my Etsy shop. I've absolutely wondered about/noticed it is impacted by 'Being started' vs 'Being driven' cycles.
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karlt10 (11-27-2020)
#34
Member
But that doesn't mean I can't still considered the 3.5 swap.... LOL
I did find and read a post on C63 owners talking about their (blue) smoke issues. Made me feel better about mine.
I did find and read a post on C63 owners talking about their (blue) smoke issues. Made me feel better about mine.
#35
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2010 Mercedes Benz GLK350 4Matic 3.5L
SLK350 ECU onto other M272 '350' Models
I'm glad there's a thread for the M272 that's active in this decade. I was wondering if an R171 SLK350 ECU can directly bolt on to the W204 C350, or in my case an X204 GLK350. If anyone can shed some light and tips with the ECU swap, I would highly appreciate it, and will source a ECU ASAP.
#36
Super Member
Thread Starter
I'm glad there's a thread for the M272 that's active in this decade. I was wondering if an R171 SLK350 ECU can directly bolt on to the W204 C350, or in my case an X204 GLK350. If anyone can shed some light and tips with the ECU swap, I would highly appreciate it, and will source a ECU ASAP.
#37
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2010 Mercedes Benz GLK350 4Matic 3.5L
SLK ECU on M272 350's
You can but if you have Xentry, you can just set the existing ECU to E35Sport in engine options, it is basicly the SLK350 software. Everything else with a 3.5L has the E35 engine option so its the same for all of them except the SLK350. If you are swapping ECU, you will need to recode it to the car you are putting it in.
#38
I managed to make it work before our city was put on lockdown. Anyone with a C230/C250/C300 equipped with the m272 can fit a 3.5L from anything like a GLK350 / E350 / S350, etc..
Everything was bolt up except a bracket for the differential was slightly different(4matic only) for the GLK350 so I had to reuse mine from the C300. The dipstick is also a little different so make sure you get one with the donor 3.5L. Otherwise, a very easy swap that bolts up and no need for ECU tuning. Just make sure to have a Xentry scanner at hand to reset the engine and transmission adaptions and you are good to go.
You definitely feel a little more torque and top-end power over the 3L m272.
Everything was bolt up except a bracket for the differential was slightly different(4matic only) for the GLK350 so I had to reuse mine from the C300. The dipstick is also a little different so make sure you get one with the donor 3.5L. Otherwise, a very easy swap that bolts up and no need for ECU tuning. Just make sure to have a Xentry scanner at hand to reset the engine and transmission adaptions and you are good to go.
You definitely feel a little more torque and top-end power over the 3L m272.
#39
I managed to make it work before our city was put on lockdown. Anyone with a C230/C250/C300 equipped with the m272 can fit a 3.5L from anything like a GLK350 / E350 / S350, etc..
Everything was bolt up except a bracket for the differential was slightly different(4matic only) for the GLK350 so I had to reuse mine from the C300. The dipstick is also a little different so make sure you get one with the donor 3.5L. Otherwise, a very easy swap that bolts up and no need for ECU tuning. Just make sure to have a Xentry scanner at hand to reset the engine and transmission adaptions and you are good to go.
You definitely feel a little more torque and top-end power over the 3L m272.
Everything was bolt up except a bracket for the differential was slightly different(4matic only) for the GLK350 so I had to reuse mine from the C300. The dipstick is also a little different so make sure you get one with the donor 3.5L. Otherwise, a very easy swap that bolts up and no need for ECU tuning. Just make sure to have a Xentry scanner at hand to reset the engine and transmission adaptions and you are good to go.
You definitely feel a little more torque and top-end power over the 3L m272.
#41
Have you considered doing a V8 CLS550 swap for that extra fun?
https://www.youtube.com/watch?v=0zSY...urnProductions
https://www.youtube.com/watch?v=0zSY...urnProductions
#43
Thank you, just to make sure you know, I have the 2.5L m272 and I’m just trying to figure out a bigger engine that is easy to swap without having to buy a new ECU and all