R60 CM4 Engine Braking
CM4 Engine Braking
My new CM4 manual has 4 doors and 4 seats, so we loaded up with 4 people and drove over the mountains from SF Bay to the coast yesterday. I'm still breaking in so I'm keeping the RPMs under control, but the 3200 pound weight of the CM4 plus 4 occupants really showed when we were going downhill. The little high-compression 1.6L needed a lot of help from the brakes to hold the speed.
This is on a familiar road where my Honda Pilot 3.5L auto had no problem controlling downhill speed, although 1200 pounds heavier to start with.
In the much lighter MCS it's probably not a issue. Something to keep in mind.
This is on a familiar road where my Honda Pilot 3.5L auto had no problem controlling downhill speed, although 1200 pounds heavier to start with.
In the much lighter MCS it's probably not a issue. Something to keep in mind.
Last edited by ghamma; May 31, 2011 at 02:45 PM. Reason: add manual trans info
I think I started with (manual) 4,3,2,brakes supplementing gear. Speed about 35-45.
I have lots of hill experience and I was surprised at the result, so I brought it up.
I have lots of hill experience and I was surprised at the result, so I brought it up.
Last edited by ghamma; May 31, 2011 at 02:46 PM. Reason: added manual info
Ya know, this is interesting. I too have noticed the engine does not slow the car as quickly as I would like. I suspect the tall gear ratios to support better gas mileage might be part of the issue.
At my local dealer, I was pointed to a couple of service department members who had spent some time with the Countryman. When I described my experience with my ALL4 manual, they reported that the only time they had with the Countryman was with the automatic, since there were so few manuals out there and all the dealership demos were automatic. With the automatic, they recall the sport mode helping with engine braking, since it expanded the RPM range for each gear. They remember engine braking working OK.
They suggested I try the sport button to see if that improves the engine braking with the manual, and report back. They also suggested that engine breaking may have more effect after the break-in period (when RPMs are restricted to under 4500). They're standing by for the results of my experiments.
They suggested I try the sport button to see if that improves the engine braking with the manual, and report back. They also suggested that engine breaking may have more effect after the break-in period (when RPMs are restricted to under 4500). They're standing by for the results of my experiments.
Does the ECU literally restrict the RPMs to below 4500?? That seems odd if so, seems like it should be up to the end user what RPM they push the car to
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