Don't feather the clutch 2-3, 3-4, etc. - BMW 3-Series (E90 E92) Forum

djjasper · 02-03-2012, 04:53 PM

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.

VTECaddict · 02-03-2012, 04:58 PM

CDV

Tom K. · 02-03-2012, 05:45 PM

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.

Tom

Wild Squid · 02-03-2012, 06:52 PM

For those of us not familiar with CDV delete, what is it and what does it do and what's the outcome?

cleex024 · 02-03-2012, 06:58 PM

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.

ziominix · 02-03-2012, 09:52 PM

Damn iPhone double post.

ziominix · 02-03-2012, 09:54 PM

..

ziominix · 02-03-2012, 09:59 PM

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.

jetblackcoupe · 02-04-2012, 12:31 AM

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

skim7x · 02-04-2012, 06:30 AM

Modified CDV + BMS Clutch Stop = normal clutch

merchomini · 02-04-2012, 09:18 AM

i hate the cdv and i really want to get rid of it

02-03-2012, 04:53 PM	#1
djjasper First Lieutenant Drives: 2007 E92 335i 6MT Join Date: Dec 2011 Location: PA Posts: 352 iTrader: (0)	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.
	Tweet

02-03-2012, 04:58 PM	#2
VTECaddict Where'd my VTEC go? Drives: 06 330i 6MT Join Date: Mar 2009 Location: Orange County, CA Posts: 4,036 iTrader: (3)	CDV __________________ AW/Terra \| ZSP \| ZPP \| ZCW \| iDrive \| CA Mods: KW V2 \| OEM Blacklines \| M-tech rear \| custom dual exhaust \| M3 steering wheel \| BMW SSK \| ZHP shift knob \| BMW Performance rep spoiler Varrstoen ES1 19x9.5+20 Front, 19x11+25 rear

02-03-2012, 06:58 PM	#5
cleex024 Major Drives: 2008 BMW 335i Coupe Join Date: Mar 2011 Location: Virginia Beach Posts: 1,170 iTrader: (2)	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. __________________ 2008 335i Coupe Space Gray l 6MT l OS Giken LSD w/ VAC Race Diff Cover l Cobb AP e85 map l Morr vs8.2 l UUC Evo3 SSK w/ DSSR l VSRF Catless Downpipes l RPI Intercooler l CDV Removed l DDM HID AE 8000k l ETS Catback Exhaust l TC Kline Coilovers s/a Front d/a Rear Camber Plates l ER Competition Dual Oil Coolers l Rear Camber and Toe Arms

02-03-2012, 09:52 PM	#6
ziominix Private First Class Drives: 2011 335i xDrive Coupe Join Date: Nov 2009 Location: WV Posts: 157 iTrader: (0)	Damn iPhone double post. Last edited by ziominix; 02-03-2012 at 10:00 PM.

02-03-2012, 09:54 PM	#7
ziominix Private First Class Drives: 2011 335i xDrive Coupe Join Date: Nov 2009 Location: WV Posts: 157 iTrader: (0)	.. Last edited by ziominix; 02-03-2012 at 10:00 PM.

02-03-2012, 05:45 PM	#3
Tom K. Major General Drives: '07 328iT, '13 Boxster Join Date: Mar 2008 Location: Maryland Posts: 5,210 iTrader: (0)	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. Tom

02-03-2012, 06:52 PM	#4
Wild Squid Banned Drives: 2011 BMW 335i coupe Msport AW Join Date: Mar 2011 Location: Nor Cal Posts: 629 iTrader: (0)	For those of us not familiar with CDV delete, what is it and what does it do and what's the outcome?

02-03-2012, 09:59 PM	#8
ziominix Private First Class Drives: 2011 335i xDrive Coupe Join Date: Nov 2009 Location: WV Posts: 157 iTrader: (0)	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.

02-04-2012, 12:31 AM	#9
jetblackcoupe Captain Drives: 2008 e92 335i 6MT Join Date: Apr 2011 Location: NJ Posts: 626 iTrader: (2)	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

02-04-2012, 06:30 AM	#10
skim7x Use it or Lose it Drives: 335i e92 Join Date: Sep 2006 Location: Newark, NJ Posts: 2,444 iTrader: (4) Garage List 2007 335i [5.00]	Modified CDV + BMS Clutch Stop = normal clutch __________________ '07 Space Gray 335i coupe w/ Sports Package \| Comfort Access FBO: Cobb S2+ \| AMS \| AR Design \| aFe \| BMS OCC \| Quaife [Newark Photoshoot #1]

02-04-2012, 09:18 AM	#11
merchomini Captain Drives: 2005 Evolution 8 Join Date: Apr 2011 Location: USA alldaway Posts: 786 iTrader: (0)	i hate the cdv and i really want to get rid of it __________________ 2005 Evolution 8 - Current 2007 SGM/coral e92 335i - Sold 2009 BSM lci e90 335i xdrive - Sold

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