R60 downshift jerk in automatic sport mode
#1
downshift jerk in automatic sport mode
anyone having issues with a sudden and pronounced downshift jerk with slight engine backfire (letting off the gas) around 25 miles per hour going from either 3rd to 2nd or 2nd to 1st in automatic sport mode?
my 2013 countryman cooper s is brand new with less than 1K miles on it.
this only occurs in the sport mode?
my 2013 countryman cooper s is brand new with less than 1K miles on it.
this only occurs in the sport mode?
#2
#3
interesting...i get the explanation of the inherent characteristic of the engine and the random backfire/pop noise that I occasionally get, but in all it seems a bit annoying to me and too abrupt in my opinion to be considered an issue?
So, am I too assume this engine behavior is deemed as NORMAL?
So, am I too assume this engine behavior is deemed as NORMAL?
#4
#5
Coming from a family of Japanese cars with sequential options on the auto tranny (Acura TL, Acura CL Type S), the first time I used the SMG on my friend's BMW 525 in sport mode definitely felt very "lurchy." Even my first 2004 Justa with a CVT seemed to have a jerkiness at low speeds.
My current CMS's behavior in sport mode shifting is certainly more "lurchy" than Japanese cars, but feels pretty normal when compared to the BMW/Mini feel.
My current CMS's behavior in sport mode shifting is certainly more "lurchy" than Japanese cars, but feels pretty normal when compared to the BMW/Mini feel.
#6
anyone having issues with a sudden and pronounced downshift jerk with slight engine backfire (letting off the gas) around 25 miles per hour going from either 3rd to 2nd or 2nd to 1st in automatic sport mode?
my 2013 countryman cooper s is brand new with less than 1K miles on it.
this only occurs in the sport mode?
my 2013 countryman cooper s is brand new with less than 1K miles on it.
this only occurs in the sport mode?
i suggest a visit to the dealer ... maybe drive another car
scott
#7
well some real helpful advise here. Thanks a lot. I'm thinking I may have something more than normal going on here. Hopefully some others may chime in with there experiences to balance out my thinking. Right now that jerk while de accelerating from 3rd to 2nd (I think) is just too much to ignore.....
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#9
#10
Next time it happens, take note of what is the "was" RPM prior to shift and the "is" RPM after the shift. That may shed some light on how much engine compression contributes to the "lurch" you're feeling. Are you used to driving a manual? Would you compare the lurch to spinning up to high RPM in low gear and jumping off the accelerator? My guess is that the downshift is occurring and spinning the engine to higher RPMs resulting in more a pronounced braking effect.
Without additional info, it's one of many hypotheses. If it's only in sport, I wouldn't worry as much. But as bmwr606 said, bring it up with the dealer. They've got the means to get more data from your car than we've got here.
Without additional info, it's one of many hypotheses. If it's only in sport, I wouldn't worry as much. But as bmwr606 said, bring it up with the dealer. They've got the means to get more data from your car than we've got here.
#12
Next time it happens, take note of what is the "was" RPM prior to shift and the "is" RPM after the shift. That may shed some light on how much engine compression contributes to the "lurch" you're feeling. Are you used to driving a manual? Would you compare the lurch to spinning up to high RPM in low gear and jumping off the accelerator? My guess is that the downshift is occurring and spinning the engine to higher RPMs resulting in more a pronounced braking effect.
Without additional info, it's one of many hypotheses. If it's only in sport, I wouldn't worry as much. But as bmwr606 said, bring it up with the dealer. They've got the means to get more data from your car than we've got here.
Without additional info, it's one of many hypotheses. If it's only in sport, I wouldn't worry as much. But as bmwr606 said, bring it up with the dealer. They've got the means to get more data from your car than we've got here.
I did however try the sport mode with paddle shift this morning and noticed ONlY a slight "pop" / backfire at the 2000 RPM number with NO jerking....obviously because I'm in manual sport mode. Therefore, "jerkiness" and pop is only in full auto sport mode de accelerating down at 2000RPM.
#14
#16
I can tell you this is completely normal.
My 2013 CM has just over 1000 miles on it and it does exactly this and only in sports mode. The jerkiness is kinda lame and I don't really care for it but the pop and backfire is awesome, especially if you have an aftermarket exhaust.
I have a magnaflow exhaust and have removed the 2nd cat and resonator and when it pops it sounds like a muscle car.
I've read other posts that say they got rid of the pop in 2011-12 models and it appears they have brought it back.
My 2013 CM has just over 1000 miles on it and it does exactly this and only in sports mode. The jerkiness is kinda lame and I don't really care for it but the pop and backfire is awesome, especially if you have an aftermarket exhaust.
I have a magnaflow exhaust and have removed the 2nd cat and resonator and when it pops it sounds like a muscle car.
I've read other posts that say they got rid of the pop in 2011-12 models and it appears they have brought it back.
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