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I have a 2019. At WOT the car will shift at a ridiculous 5500 RPM!
It is the worst going from 1 to 2 and 2 to 3 but still happens in the other gears as well. From 1-2 it will actually bog down after it shifts too.
-yes I am pressing gas pedal all the way down
-happens in all drive modes
-happens with TC fully off, in sport, or on.
-car is stock (problem happens even with JB4 uninstalled)
-no CELs or stored codes either.
-TCU and ECU reset haven’t helped
-car has only 30k km and is otherwise healthy
That is pretty normal. Power goes flat above 5000 rpm and torque starts to drop. The turbos are not designed for top end power. Similar situation with the C63. I don't pay much attention to where it shifts on its own as I mostly drive in manual mode, but even I short shift most times, because it pulls harder in the next higher gear than staying in the current gear all the way to redline. It is an aspect of these engines that I'm not a big fan of. I'm used to high revving naturally aspirated engines that pull all the way to redline with the power curve not going flat up top. Tunes actually make it worse, because w/o larger turbos they just increase the low and midrange, and then it falls off even harder at the top. The stock turbos are too small to make much more power at the top end.
Wow surely this can’t be normal! I’ve driven many other modern turbo cars and none have a randomly changing shift point. What is even the point of a redline then? It’s odd because at part throttle it will wind up to 6250 but at WOT I’ve even caught it up shifting at 5000rpm from 1-2! A full 1200 rpm before redline.
sometimes it even hesitates immediately after the 1-2 shift, as if the fuel cut is still in effect.
Looking at this chart it seems like power holds until redline.
It's like the tac can't keep up with the revs in the low gears. It fuel cuts at/near 6250 and if you let the car do that in manual mode you will feel the bog between gears.
I usually pull the paddle around 4500 RPM in first gear to avoid the fuel cut. Looking forward to trying the new drivetrain in the w206 with MCT and higher redline.
I have the digital gauge cluster so I don’t think it’s just display lag. It is also sometimes shifting at 5000rpm so I don’t think it’s lagging by 1000rpm. This is a modern car after all…not some mechanical cable driven dial from an 80s car.
actually I should also mention that OBD datalogging shows the shifts are happening early too.
I have the digital gauge cluster so I don’t think it’s just display lag. It is also sometimes shifting at 5000rpm so I don’t think it’s lagging by 1000rpm. This is a modern car after all…not some mechanical cable driven dial from an 80s car.
actually I should also mention that OBD datalogging shows the shifts are happening early too.
Are they consistently early in each individual gear? If they are I would say this is normal, if it is different each pull in each gear I'd say you have a problem.
I would also turn traction control off for testing and make sure the conditions are favorable.
Are they consistently early in each individual gear? If they are I would say this is normal, if it is different each pull in each gear I'd say you have a problem.
I would also turn traction control off for testing and make sure the conditions are favorable.
Yeah, wildly variable and even with TC fully off. I’ve got an appointment booked now - I was hoping it would be a common enough issue. I bet the dealer will flash the ecu and cpc and send me on my way.
PFL205.064 with M276.823 (Oil pump solenoid defeated)
OP, since you have the facelift, I found this video of someone "launching" the car and this is the shifting behaviour it exhibits, skip to 0:57 for "launch" when the car was in automatic shifting mode.
PFL205.064 with M276.823 (Oil pump solenoid defeated)
OP, just to confirm you notice no boost leak right? From what I gathered even with boost leak, no codes or CEL comes in some circumstances. That said, your HP at the wheels you posted seems correct for a facelift, unless I am missing something.
Interesting to see that video!!! Now if my car could rip a sub 4s 0-60 I wouldn’t be as concerned!
but I also have a hesitation after shifting from 1-2.
I think the next step is to check for boost leaks.
Check the little vacuum valve/fitting on the back of the motor on the (US) drivers side.
It has a diaphragm in it that seems to cause bogs in the 1-2 shift.
Check the little vacuum valve/fitting on the back of the motor on the (US) drivers side.
It has a diaphragm in it that seems to cause bogs in the 1-2 shift.
Hey I’d love to check that, thanks for the tip. Do you helping me with finding it? Pic perhaps? And how to check? Where?
I did also check the coupler between the intake manifold and intercooler which I’ve read can be a common spot for a boost leak. It seems secure but I gave the worm clamps a few twists anyhow.
Hey I’d love to check that, thanks for the tip. Do you helping me with finding it? Pic perhaps? And how to check? Where?
I did also check the coupler between the intake manifold and intercooler which I’ve read can be a common spot for a boost leak. It seems secure but I gave the worm clamps a few twists anyhow.
I the pic you posted, the perspective make it look like there's a black vacuum line come out of the side of the oil dipstick. That's the line you need to trace back and replace the valve/fitting.
09-08-2022, 06:37 PM
