SLK55 AMG R172, M152 Engine & Exhaust System - Mercedes Benz SLK Forum

AMGs For those high performance Mercedes-Benz R170/R171/R172 cars tuned by AMG

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#1 Old 12-16-2016
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SLK55 AMG R172, M152 Engine & Exhaust System

Pretty old link obviously but one of the best I've read in terms of detail and information about the M152 engine and the exhaust system. Good read anyway so thought I'd share the link here.


0 to 62mph. OFFICIAL.: AMG?s Preview of the SLK 55 (R172) Starts with the Engine
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#2 Old 12-16-2016
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Probably the best illustration of the exhaust system's flaps I've seen anywhere.
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#3 Old 12-16-2016
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Thanks. But they make much ado about the ECO function and the requirements for it to work. As I (and others) have found out, it is very haphazard/sporadic as to its activiation.

I have it come on (ie stops the engine) within 1 minute of startup/city driving in cold (<40o) weather. Needle barely moves off the pin.

Other times I've had it non-functional after an hour on the highway and getting on the off-ramp and stopping at a light--engine still running. It is always in ECO mode (dash button).

My car must be female--can't make up her mind
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#4 Old 12-16-2016
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Here's a very good reference on how the ECO system works and all the related requirements for operation:

http://www.glaowners.com/forum/attac...logy-guide.pdf
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#5 Old 12-16-2016
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I would concur that the ECO start stop system is not very predictable at times. Looking at the guide posted above it's obviously quite a complicated system. I rarely use it so no big deal for me!

In the write up on the exhaust system it seems to suggest that there are no secondary cats on the R172 55 but from looking at the system it looks like a similar set-up to the R171 with 2 cats per side.

Are the secondary chambers on the R172 just resonators I wonder? Been thinking about exhaust mods for the 172 for a while now and deleting the secondaries seems like a safe option to get some more sound out without worrying about drone in the cabin when cruising.

Whatever I end up doing (if anything) I'd like to be sure of no odd sounds when running in ECO4 mode too.


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