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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Wed, Feb-07-2018, 04:54:20 PM   #1
Kleedzine
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Default Is there such a thing like clutch spindown time for manual transmission?

I am recently having some shifting issue.
Changed tranny oil, bleeded clutch line.

But I still experiencing hard shifting, it's better than before though.

So I kept researching for the issue, ended up finding there's such a thing called clutch spin down time.

Basically, it takes time(several seconds) to input shaft completely stopped when the clutch is disengaged(clutch pedal is depressed).

Is it applied to our system?
Anybody has similar experience?
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Old Wed, Feb-07-2018, 05:06:17 PM   #2
zeta456
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Default Re: Is there such a thing like clutch spindown time for manual transmission?

What kind of issues are you having and have they just started or always been there ?
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Old Wed, Feb-07-2018, 05:08:48 PM   #3
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Default Re: Is there such a thing like clutch spindown time for manual transmission?

When you are stopped in first gear with the clutch pedal depressed (clutch disengaged) and you rev the car a bit, does the car move at all? If your clutch isn't disengaging all the way, this could show it.

Do you have issues putting the car in reverse from a stop?
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Old Wed, Feb-07-2018, 05:41:48 PM   #4
Kleedzine
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Default Re: Is there such a thing like clutch spindown time for manual transmission?

hard shifting's just started this winter, no problem at all in the last winter.
the clutch is fully disengaged when the pedal is pressed, but it takes few seconds (3-5sec) depends on the temperature. I know it because I can hear maybe input shaft bearing squealing noise when engine is on, gear in neutral, but when I press the clutch pedal, the sound fades away, then it shifts smoothly without issues.

I have to put in 1st gear before going into reverse gear.

I am trying to figure it out if it is normal or needed to be fixed.
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Old Wed, Feb-07-2018, 05:42:57 PM   #5
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Default Re: Is there such a thing like clutch spindown time for manual transmission?

Synchros alleviate the engine-to-transmission speed matching. 1st gear synchros can wear out quickly though, making it hard to shift into 1st without coming to a complete stop. If the other gears synchros are also wearing out, you'll have to time your shifts more accurately so that the engine and transmission speeds match.
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Old Wed, Feb-07-2018, 05:51:50 PM   #6
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Default Re: Is there such a thing like clutch spindown time for manual transmission?

Have you removed your CDV? If not, I would remove that and bleed the line with fresh fluid. There shouldn't be that long of a delay when you press the clutch even with the CDV still in place.
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Old Wed, Feb-07-2018, 05:57:42 PM   #7
Kleedzine
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Default Re: Is there such a thing like clutch spindown time for manual transmission?

Quote:
Originally Posted by Ramp1 View Post
Have you removed your CDV? If not, I would remove that and bleed the line with fresh fluid. There shouldn't be that long of a delay when you press the clutch even with the CDV still in place.
Yes I have removed the CDV few month ago. I have fresh fluid in clutch line,brake line, and the reservoir. Also, fresh Redline D4 ATF in the transmission
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Old Wed, Feb-07-2018, 06:04:58 PM   #8
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Default Re: Is there such a thing like clutch spindown time for manual transmission?

Quote:
Originally Posted by Kleedzine View Post
Yes I have removed the CDV few month ago. I have fresh fluid in clutch line,brake line, and the reservoir. Also, fresh Redline D4 ATF in the transmission
I would switch that ATF to the MTF recommended by BMW
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Old Wed, Feb-07-2018, 06:33:29 PM   #9
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Default Re: Is there such a thing like clutch spindown time for manual transmission?

Quote:
Originally Posted by Kleedzine View Post
Yes I have removed the CDV few month ago. I have fresh fluid in clutch line,brake line, and the reservoir. Also, fresh Redline D4 ATF in the transmission
Found the problem!

Use the fluid BMW specs
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Old Wed, Feb-07-2018, 07:13:23 PM   #10
e46Dan
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Default Re: Is there such a thing like clutch spindown time for manual transmission?

I had the redline D4 in my last transmission, I think it's way too thin. I agree with using the LTF-2 oil for the transmission.
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Discussing Turner's new monoball FCABs in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)