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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Don't feather the clutch 2-3, 3-4, etc.



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      02-03-2012, 05:53 PM   #1
djjasper
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Don't feather the clutch 2-3, 3-4, etc.

Do you all find that if you don't literally yank your foot off the clutch from 2nd to 3rd and on up you get some wasted revs before engagement. I'm talking about when you are good and hard on the throttle, but the necessary release is almost like popping the clutch. Agree? I assume this is normal.
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      02-03-2012, 05:58 PM   #2
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CDV
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      02-03-2012, 06:45 PM   #3
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Never had this problem and never deleted a CDV on any of my 5 MT Bimmers.

The trick (especially for the 1~2 and 2~3 shifts) is to upshift quickly so that once you are in the new gear, the revs will match and a normal clutch engagement is easy.

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      02-03-2012, 07:52 PM   #4
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For those of us not familiar with CDV delete, what is it and what does it do and what's the outcome?
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      02-03-2012, 07:58 PM   #5
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CDV is a clutch delay valve which helps delay the engagement of the clutch...its suppose to help the transmission against those to like to drop clutches.

but to those to actually like to drive hard it basically just rides the clutch for a bit longer wearing the clutch out faster.

you can delete this by just removing the CDV and plugging the line directly back in.

just search the forums and there is a diy on it.
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      02-03-2012, 10:52 PM   #6
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Damn iPhone double post.

Last edited by ziominix; 02-03-2012 at 11:00 PM.
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      02-03-2012, 10:54 PM   #7
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..

Last edited by ziominix; 02-03-2012 at 11:00 PM.
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      02-03-2012, 10:59 PM   #8
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Alternatively you can remove the valve, pop out the restriction plate and reinstall. There are DIYs here on the forum. This is the best route for anyone still under warranty, no visible difference from stock. For anyone who is capable at driving a MT car, it's quite annoying to drive with it in place. It slows the fluid to slow the clutch engagement, great for people who can't change gears smoothly.

If you're driving normally and not slamming gears, you won't notice it so much on the upshifts, but if you're like me and rev match every downshift, that's where it becomes really apparent as it wont release exactly when you tell it to.
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      02-04-2012, 01:31 AM   #9
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I have the cdv and that makes regular, relaxed driving smooth and simple.. but driving for max acceleration is frustrating.. this engine's rpms take their sweet time to drop to the next gear's proper rpm (especially 1-2).. I've asked before on this forum and I got the unsatisfying answer of either painfully waiting til the rpms take their time to drop or by releasing the clutch really slowly... which i feel makes you lose a lotttt of speed but I don't know
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      02-04-2012, 07:30 AM   #10
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Modified CDV + BMS Clutch Stop = normal clutch
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      02-04-2012, 10:18 AM   #11
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i hate the cdv and i really want to get rid of it
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