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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Transmission Slipping / "Flare Shift"? 49k - FBO | E50



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      07-30-2015, 07:38 AM   #1
mike5809
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Transmission Slipping / "Flare Shift"? 49k - FBO | E50

Hey All - This morning I felt some strange behavior that I think relates to the transmission slipping. I have a 2011 335i xDrive AT with 49,xxx. The car is FBO with E50.

Again - I just felt it this morning but almost every time I got on it I experienced this.

When I went WOT in 3rd and shifted to 4th the RPMs would drop when it went into 4th as it should (example, when I shift into 4th it would settle around 3,250 RPMs) - but as soon as the RPMs dropped post shift the RPMs would shoot up a bit (above example they would probably go from 3,250 up to 4,000/4,250) then go back down and the car would accelerate as normal.

Do you think it is an issue with the transmission slipping / transmission flare / not holding power?

Let me know your thoughts - hoping that my transmission isn't on its way out.
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Last edited by mike5809; 07-30-2015 at 08:14 AM.
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      07-30-2015, 07:42 AM   #2
weehe126
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Probably would help if you posted a log of it happening so we can compare it to logs where we know the trans was slipping.
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      07-30-2015, 07:55 AM   #3
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Sounds good - will try to get one today/tomorrow.

Again - it just happened this morning but I haven't noticed it any other time.
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      07-30-2015, 08:08 AM   #4
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Is TC on or off?
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      07-30-2015, 08:14 AM   #5
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Completely off.

I just took it around the block to try and replicate and I couldn't. So not sure if it was a one time thing, only after the car is warmed up, etc. Will keep an eye one it.
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      07-30-2015, 09:49 PM   #6
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Did you have to release the pedal a bit so the clutch can grip before you floored it again? I have an xdrive MT same year and about same mileage. It happens when I shift too aggressively so I slip it a little.

I always figured its an xdrive thing or my clutch is slipping when I'm banging the gears.
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      07-31-2015, 04:48 AM   #7
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Quote:
Originally Posted by Dhillon92
Did you have to release the pedal a bit so the clutch can grip before you floored it again? I have an xdrive MT same year and about same mileage. It happens when I shift too aggressively so I slip it a little.

I always figured its an xdrive thing or my clutch is slipping when I'm banging the gears.
he has an automatic.
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      07-31-2015, 06:34 AM   #8
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I know, I read his post, by his "pedal" I was referring to his accelator.

I experience similar symptoms on my MT, it feels as if instead of spinning tires, it just causes clutch slippage.

Although all traction control is off, its practically impossible to spin any of the tires, thus feeling as if the clutch, or perhaps the tcase hesitates to grip if its too aggressive.

I'm only trying to relate to his issue.
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      07-31-2015, 06:39 AM   #9
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That is pretty spot on with how it feels. I will drive the car a bit today to see if I can replicate. It's definitely not a "traditional slip", as it holds power WOT, it just occurred post shift (in your scenario when traction would break loose).

PTF sent me a new map with torque scaler and levels adjusted to see if it would help but unfortunately it didn't.

I just drove to work and it only did it once - it was when I went WOT in 3rd gear and shifted into 4th around 4,400 RPMs - the RPMs settled in the low 3's, jumped up about 400rpms then went back down. It seems as if I get this most often when I shift into 4th right in the meat of my torque powerband - when I shift higher or lower I haven't noticed it as much.

Will the Alpine Trans Flash help at all? Or completely unrelated?

Last edited by mike5809; 07-31-2015 at 07:43 AM.
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      07-31-2015, 08:26 AM   #10
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It definitely sounds like slipping to me. A shift is much harder on a clutch than a straight pull in a single gear, so it makes sense that it occurs right after the shift during peak torque. This is why the ECU pulls timing during shifts (to try and reduce the stress on the trans during shifts).

The Alpina flash will certainly help. I'm pretty sure it increases line pressure which should make the clamping force higher and reduce the slippage during shifts.

In fact, I'd say that the Alpina flash should be mandatory for anyone who plans to go WOT in their automatic car more than once a week.

Manual mode with the Alpina shifts the hardest, followed by S mode, followed by D-Manual mode, followed by straight D mode.
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      07-31-2015, 08:31 AM   #11
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Great info! Thanks so much - I was always hesitant of doing to trans flash for some reason. Looks like I will go ahead and get it flashed now.

Thanks so much!
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      07-31-2015, 12:39 PM   #12
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Mike,
I offer to meet up with you if you'd like to trial the Alpina flash out on my car.....as long as you let me trial out your suspension ride quality.
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      07-31-2015, 12:41 PM   #13
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Quote:
Originally Posted by wgknestrick View Post
Mike,
I offer to meet up with you if you'd like to trial the Alpina flash out on my car.....as long as you let me trial out your suspension ride quality.
Damn - I was just in Lancaster last weekend! If you come to York absolutely. I probably won't get to go out to Lancaster again until mid-August but I will let you know.
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