C180K, C200K conversion to C230K with M271 series 240, 246, 248

[miro]

After many hours of sifting through the data and checking 6 VINS against each other I can suggest the following findings about the M271.

* If the engine is 2005 spec then it will be specially upgraded already with low noise parts that were recently introduced.

* In all M271 2005 the 5 speed transmission is identical

* In all M271 the crankcase and 5 speed auto slip ring are identical

* all results exclude CGI and SLK for now.

DOES NOT APPLY TO CGI
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[series 240, 246, 248 only]


C180K, C200K and C230K differ in the following ways
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- piston
- supercharger (only 2 models - one for 230K and one for others.
- ECU (engine control unit)
- Some differences in intercooler and hoses are possible with year of build.

= 140Kw in total without pulley mods

RESULT
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In some cases that means 20-40Kw improvement.

CAVEAT
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This mod uses only MB parts and should only be done with informed risk and has no implied warranty.

 

[R2D2]

Miro. I just found this thread. I might be being thick so what parts are you suggesting we change -just remap the ECU to C23ok settings?

 

[sym]

Surely he's saying that the 230k has a a different supercharger, pistons, AND ECU, so you'd need to change all three to get the manufacturers desired effect ! (But your transmission should be OK!)

S.

 

[miro]

Surely he's saying that the 230k has a a different supercharger, pistons, AND ECU, so you'd need to change all three to get the manufacturers desired effect ! (But your transmission should be OK!)

S.

Indeed you are right. There are two SC's, two piston types and 3 ECU. You can make 3 variants with 2 x 2 combinations. Obviously there is no logical variant in the ECU as it is specific for a task (but there are 3 versions)

I believe that in developer mode you can reset the engine type of the ECU.

PISTON SC
Low Low
High Low
High High

This is not the real matrix but I am postulating that these compression combinations make the 3 engine types.

 

[R2D2]

So I need to get into developer mode on the ECU. What about just adjusting the Superchargers boost settings or getting the bypass valve to stay shut longer!

 

[se97mlm]

180k and 200k are identical, it's just the software in the ECU that limits the output (and maybe a pulley for the SC). That's why they are called internally m271 and m271red (red for reduced output)

THe 230k engine is called m271evo and has the different pistons etc.