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      03-17-2019, 02:51 AM   #1
Al1969
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My M2C just got the break in and had complete reset of the computer due to BMW recall campaign ...
Its a Dec 2018 manual gear box Swiss version

Before and after break in I feel my car is having a problem with power delivery (had a M2 before);

Its hard to explain but it happens below 3K rpm, when I put the gaz the power does not come straight, there is some kind of hiccup, it feels like the power is artificially blocked till you pass the 3K rpm ... pretty annoying because the power delivery is not constant.

I returned the car to the garage but they did not see any problem

Do you have similar impressions with your car?
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      03-17-2019, 02:59 AM   #2
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What recal?

Yes I had what you describe for a couple of times, but its not always.
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      03-17-2019, 03:18 AM   #3
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Quote:
Originally Posted by ///M Houbi View Post
What recal?

Yes I had what you describe for a couple of times, but its not always.
Well actually had two recals
1- change of sticker for tires specifications (BMW did not have the new sticker)
2- Complete reprog of DME because of wrong pressure calculation in exhaust

I wonder when you say you had ... it was solved somehow or you still have this power blockage feel sometimes?
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      03-17-2019, 03:23 AM   #4
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Hi

I had no recalls so far. I've experienced what you said below 3K two or three times. It did happen so rarely I did not mind about it too much. But I maybe should?

When was your car built? What "new" sticker where you missing, I have the tire pressure sticker. What has changed on the sticker? You have DCT or 6MT?
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      03-17-2019, 03:35 AM   #5
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Quote:
Originally Posted by ///M Houbi View Post
Hi

I had no recalls so far. I've experienced what you said below 3K two or three times. It did happen so rarely I did not mind about it too much. But I maybe should now.

When was your car built? What "new" sticker where you missing, I have the tire pressure sticker? You have DCT or 6MT?
Yes I think they need to change the tire pressure sticker because of winter tire specifications to change from V to W or something like that ... but honestly I don't care

For the power issue ... I will go to another BMW garage, where I can have an M expert to look at my car... I am pretty annoyed by this
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      03-17-2019, 03:38 AM   #6
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How many times did it happen with your car? Is it happening so frequently?

I'm not even sure if it happened two or three times or one or two times, very rare either way. But when it happend it really was annoying a lot!
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      03-17-2019, 04:33 AM   #7
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Quote:
Originally Posted by Al1969 View Post
Well actually had two recals
1- change of sticker for tires specifications (BMW did not have the new sticker)
2- Complete reprog of DME because of wrong pressure calculation in exhaust
I recently got a letter from BMW Portugal listing two “technical campaigns”. The translation would be something like:

0071550200 - When you can - Check / Replace the warning sticker regarding the tire pressures
10071550200 - Program the command units

They weren’t specific about what issue(s) the programming was addressing... so I’ll probably let the local BMW dealer order the sticker and have the recall work done during the first service. I’ve only done 700Kms and I’d like to enjoy my BimmerCode light tweaks (and unofficial CarPlay) for a few more days (weeks?), should they get defaulted/ erased at the dealers workshop... and I have to start over.
Also, I can’t say I noticed a power delivery issue (just an occasional hiccup when accelerating from a junction, a couple of minutes after starting the car)...

Last edited by Abrunho; 03-17-2019 at 02:58 PM..
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      03-17-2019, 08:54 AM   #8
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DCT or MT?
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      03-17-2019, 09:46 AM   #9
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I have 6MT.

OP, do you have 6MT or DCT?
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      03-17-2019, 10:05 AM   #10
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Quote:
Originally Posted by ///M Houbi View Post
I have 6MT.

OP, do you have 6MT or DCT?

MT 👍
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      03-17-2019, 10:29 AM   #11
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6MT here as well.
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      03-17-2019, 10:38 AM   #12
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Quote:
Originally Posted by Al1969 View Post
Quote:
Originally Posted by ///M Houbi View Post
I have 6MT.

OP, do you have 6MT or DCT?

MT 👍
When was your car built? Mine was built october last year, I assume yours was built later.

My dealer never contacted me so far about any recalls?
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      03-17-2019, 10:44 AM   #13
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Quote:
Originally Posted by ///M Houbi View Post
Quote:
Originally Posted by Al1969 View Post
Quote:
Originally Posted by ///M Houbi View Post
I have 6MT.

OP, do you have 6MT or DCT?

MT 👍
When was your car built? Mine was built october last year, I assume yours was built later.

My dealer never contacted me so far about any recalls?
You can give me your VIN in PM
We can check it for you
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      03-17-2019, 10:38 PM   #14
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try to recreate the problem in MDM mode or DSC off mode - I'll almost guarantee what you are feeling is the proactive torque management, it predicts the wheels will slip and reduces available torque before they do. it does not do this in MDM or DSC off mode.

although it's frustrating, it's actually kinda smart, remember the bad reviews of early f8x m3/m4's being dangerously tail happy? this is how they fixed it.
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      03-17-2019, 10:57 PM   #15
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As others have said this is a function of the DSC limiting your slip. Drive with DSC off to see how the car drives without the nannies...unfortunately more often than not the nannies are engaging with the torque happy low end that most aren't used to.
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      03-18-2019, 02:53 AM   #16
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Quote:
Originally Posted by OGM2C View Post
try to recreate the problem in MDM mode or DSC off mode - I'll almost guarantee what you are feeling is the proactive torque management, it predicts the wheels will slip and reduces available torque before they do. it does not do this in MDM or DSC off mode.

although it's frustrating, it's actually kinda smart, remember the bad reviews of early f8x m3/m4's being dangerously tail happy? this is how they fixed it.
That's a super credible reason ... I will check it ...
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      03-18-2019, 05:39 AM   #17
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Quote:
Originally Posted by Al1969 View Post
That's a super credible reason ... I will check it ...
+1

in my case, this was the solution…
expecially on winter tyres.
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      03-29-2019, 12:29 AM   #18
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Quote:
Originally Posted by fordnox View Post
+1

in my case, this was the solution…
expecially on winter tyres.
I noticed this too. Actually took my car in cause I thought it had a broken charge pipe. Just got my summer tires back on and problem solved
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      03-29-2019, 06:28 AM   #19
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I always drive in MDM as a minimum, and even yesterday with 61F temps and sun on the road all day (heating it up), traction in 1st (6MT) was still difficult to find. The low to midrange torque is so high, you just can't hook and go. However, MDM is incredibly well tuned to manage wheelspin and keep at it (as opposed to taking away tons of power and not giving it back for eternity). It will allow the M2C to rev out 1st gear and manage its wheelspin pretty damn well - better than any past BMW I've driven.

If you try the same 1st gear, cool road, WOT acceleration with DSC off, you really have to focus a lot of effort on throttle management, and it's difficult to get a feel for how much more the PSS tires will take especially since 1st gear lasts so little time under WOT. You overwhelm them for a split sec, have to back out a good bit to regain grip, then roll on more guessing at grip level, trying to keep spin under that 10-15% rate, etc. It is not easy on this car with PSS and cool roads, and I've been doing this stuff with powerful RWD cars for more than 40 years.

PS4S would help as they actually have a lot more grip at moderate temperatures than the PSS (went though this tire change on my M5 and M3). On my E90 M3, the PSS were less than 2 years old and had maybe 5k miles on them, but on cool (55F) roads and DSC off, under WOT as soon as the S65 reached ~5500rpms, it would just blow the tires away, and you'd have to be immediately managing the throttle -- very difficult to rev out to 8300 in 1st. The M5 (E39) was similar to the M2C as it would want to spin them at 2000rpm. The switch to PS4S was fantastic. Of course part of that was fresh out of the mold rubber (no thermo-oxidative aging yet), but the other is the compounding of the PS4S rubber.
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      03-29-2019, 08:04 AM   #20
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I was playing around the other day. (Sport Mode)

From a stop with DSC on, full throttle acceleration and barely any wheelspin.
From a stop with MDM on, full throttle acceleration and some wheelspin with brakes grabbing left/right/left/right through 1st-2nd gear and didn't track as straight as I would've expected due to this.
From the same stop as the above two cases with DSC off, full throttle acceleration with complete wheelspin through 1st-3rd tracking completely straight with minimal steering input. Wasn't fast but definitely made lots of smoke and layed two wasted patches of rubber.
From a stop with DSC off, launch control enabled at default launch RPM, full acceleration, minimal wheelspin, good traction and seemed very close to max achievable acceleration given road and tires.
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