6M problem: very hard when shifting fast

SS32 · 12-09-2009, 06:29 PM

Quote:

Originally Posted by Jonmartin

Take your clutch delay valve out smooths out the 1-2 shift at High RPM by a decent amount people like to claim it doesnt do anything but everyone thats done has said its made a different so give it a try wont hurt. As for the other gears I dunno what to tell you I shift pretty fast and I dont have those problems.

There is no CDV

BPMSport · 12-09-2009, 06:33 PM

Quote:

Originally Posted by SS32

There is no CDV

There is something that mimics a CDV, although it doesn't look like it has a restriction (like the CDV's from the E46's).

I felt a difference when I had it removed.

Jonmartin · 12-09-2009, 08:42 PM

Quote:

Originally Posted by SS32

There is no CDV

lol smh

JCtx · 12-09-2009, 11:01 PM

I was under the impression our 6MT trannies were Getrag indeed

. At any rate, ZF is rated better, making even less sense if true

.

OP, use 2 fingers to shift from 3rd to 4th and don't pull the clutch out too soon; it's the easiest shift. If you still have a problem, then it's going to be your tranny for sure. But that doesn't mean you were not at fault; as said, you can basically grind the synchro to an early death without proper clutch action. Good luck.

King Tut · 12-10-2009, 01:50 PM

Does everyone that removes this non restricting valve bleed their clutch line afterwards?

dcstep · 12-10-2009, 02:34 PM

Leozap, the way you described your test, it's like you're going 40 to 50 mph, you push the clutch all the way in, wait a second or so and then try to shift fast from 3d to 4th. If that's what you're doing, you're probably letting the revs drop too much and then shifting, that'll stress the syncros and make the shift hard.

What happens if you're accelerating in the 40 to 50 range and quickly shift right as you deprss the clutch fully? There should be no problem. That shift is extremely fast in my '09 M3.

Dave

BPMSport · 12-11-2009, 02:15 AM

Quote:

Originally Posted by King Tut

Does everyone that removes this non restricting valve bleed their clutch line afterwards?

You should. I did.

12-09-2009, 11:01 PM	#26
JCtx Major General 258 Rep 5,012 Posts Drives: No BMW yet Join Date: May 2008 Location: El Paso TX iTrader: (0)	I was under the impression our 6MT trannies were Getrag indeed . At any rate, ZF is rated better, making even less sense if true . OP, use 2 fingers to shift from 3rd to 4th and don't pull the clutch out too soon; it's the easiest shift. If you still have a problem, then it's going to be your tranny for sure. But that doesn't mean you were not at fault; as said, you can basically grind the synchro to an early death without proper clutch action. Good luck.
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12-10-2009, 01:50 PM	#27
King Tut NASA SpecE30 Racer 82 Rep 1,307 Posts Drives: 2006 Honda S2000 TT3 Join Date: Jul 2008 Location: Gulf Breeze, FL iTrader: (2)	Does everyone that removes this non restricting valve bleed their clutch line afterwards? __________________ King Tut 2012 BMW M3 Individual: Sold lsb.ridedomain.com 1987 BMW 325is SpecE30: spece30.ridedomain.com 2009 BMW M3 Coupe: Sold e92.ridedomain.com
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12-10-2009, 02:34 PM	#28
dcstep Major General 1290 Rep 7,389 Posts Drives: '09 Cpe Silverstone FR 6MT Join Date: Nov 2008 Location: Colorado iTrader: (0) Garage List 2009 M3 [8.40]	Leozap, the way you described your test, it's like you're going 40 to 50 mph, you push the clutch all the way in, wait a second or so and then try to shift fast from 3d to 4th. If that's what you're doing, you're probably letting the revs drop too much and then shifting, that'll stress the syncros and make the shift hard. What happens if you're accelerating in the 40 to 50 range and quickly shift right as you deprss the clutch fully? There should be no problem. That shift is extremely fast in my '09 M3. Dave __________________ Flickr Photos Ucm, Inc.
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