Clutch Delay Valve Found!! 6 speed cars

TurboAra · 05-10-2018, 04:43 PM

Hey guys, I wanted to share this awesome discovery. I did his mod on my F30 but the f80 and F82 uses the same components to operate the clutch including the slave. Drilling out the clutch delay valve changed the whole feel of the car and driving experience. Please take the time to read on thread is here.

http://f30.bimmerpost.com/forums/sho....php?t=1486773

ByeFelicia · 05-10-2018, 05:58 PM

Someone told me this is a "must" do sort of thing for a six speed in BMW

I have trouble getting smooth shifts from 1-2nd in sport + consistently. (I am not a seasoned vet in manual driving)

Will this removing this, for sure make the 1-2 shift smoother and more consistent?

Judging by that first post on your link (also no jerking when normally driving and shifting from 1st to 2nd.) I would assume so.

doug_999 · 05-10-2018, 06:14 PM

I don't believe the M3/M4 has this.

http://f80.bimmerpost.com/forums/sho....php?t=1148072

ByeFelicia · 05-10-2018, 06:17 PM

Interesting. I get my car worked on at a very reputable shop and was told yes. F8X manual do have them.

AndyLu · 05-10-2018, 07:03 PM

I believe this has been covered but I can be wrong

doug_999 · 05-10-2018, 09:44 PM

Quote:

Originally Posted by ByeFelicia

Someone told me this is a "must" do sort of thing for a six speed in BMW

I have trouble getting smooth shifts from 1-2nd in sport + consistently. (I am not a seasoned vet in manual driving)

Will this removing this, for sure make the 1-2 shift smoother and more consistent?

Judging by that first post on your link (also no jerking when normally driving and shifting from 1st to 2nd.) I would assume so.

Sport plus has rev match off, otherwise it is on. So smoother shifts with rev match.

ByeFelicia · 05-10-2018, 10:37 PM

Yes, im aware. I drive in this mode to drive in no nanny mode and get a better feel for no assist manual.

doug_999 · 05-10-2018, 10:47 PM

Quote:

Originally Posted by ByeFelicia

Yes, im aware. I drive in this mode to drive in no nanny mode and get a better feel for no assist manual.

and that is one of the reasons you are having trouble with the 1-2 shift.

And I don't believe removing the CDV makes things smoother.

rr006rbc · 05-10-2018, 11:23 PM

Not sure why everyone has issues shifting thru gears in their F8X. This is my second manual M3 with the first being a 2015 and I couldn't be happier with how the gearbox shift quality is..

Your left foot probably sucks in modulating the clutch?

TurboAra · 05-11-2018, 12:27 AM

Quote:

Originally Posted by doug_999

I don't believe the M3/M4 has this.

http://f80.bimmerpost.com/forums/sho....php?t=1148072

Yes m3, m4 and m2 have the clutch delay valve according to realoem and dealer. It uses same part number as all the other F series cars. My 1-2 shifts were improved drastically, almost feels like a different car. Much more positive shifts and smoother downshifts.

G35POPPEDMYCHERRY · 05-11-2018, 12:33 AM

lol I drive the car like butter. shit even in sports plus. learn the nature of the car. dont fight it

prodigymb · 05-11-2018, 08:59 AM

Quote:

Originally Posted by TurboAra

Yes m3, m4 and m2 have the clutch delay valve according to realoem and dealer. It uses same part number as all the other F series cars. My 1-2 shifts were improved drastically, almost feels like a different car. Much more positive shifts and smoother downshifts.

so you did this mod on a F80 M3?

DWEI · 05-11-2018, 12:53 PM

I've been driving MT for the past 15 years and 35 cars. IMO The F8x transmission has one of the better gear boxes or there. I have no issues smoothly going through gears. But to each thier own.

Does this mod negatively effect the car somehow?

x.shell · 05-11-2018, 01:52 PM

Quote:

Originally Posted by TurboAra

Yes m3, m4 and m2 have the clutch delay valve according to realoem and dealer. It uses same part number as all the other F series cars. My 1-2 shifts were improved drastically, almost feels like a different car. Much more positive shifts and smoother downshifts.

Looks like TurboAra is correct. It is indeed the same part between the F30 and F80.

http://www.realoem.com/bmw/enUS/show...diagId=21_0271

tom @ eas · 05-11-2018, 03:08 PM

Quote:

Originally Posted by exo-shell

Looks like TurboAra is correct. It is indeed the same part between the F30 and F80.

http://www.realoem.com/bmw/enUS/show...diagId=21_0271

There is no CDV in that image. #14 is a slave cylinder.

x.shell · 05-11-2018, 03:25 PM

Quote:

Originally Posted by tom @ eas

There is no CDV in that image. #14 is a slave cylinder.

Not saying there is a CDV in it or not (because I don't really know). But I'm just stating that the part numbers are the same for the F30 and F80 as TurboAra stated. For the F30, the CDV is inside the slave cylinder. Again, I am not sure if it is inside the F80, but they share the same part number which definitely looks like the F80 will have a CDV inside the slave cylinder as well.

tom @ eas · 05-11-2018, 03:29 PM

Quote:

Originally Posted by exo-shell

Not saying there is a CDV in it or not (because I don't really know). But I'm just stating that the part numbers are the same for the F30 and F80 as TurboAra stated. For the F30, the CDV is inside the slave cylinder. Again, I am not sure if it is inside the F80, but they share the same part number which definitely looks like the F80 will have a CDV inside the slave cylinder as well.

Interesting, haven't had a need to disassemble a slave cylinder yet. Thanks for linking.

TurboAra · 05-11-2018, 05:46 PM

there is no CDV as a separate part, it is located inside he Slave cylinder and is there no matter how many M badges are on the car. If any of you have owned a E90/E92 car with a manual gearbox you would know how big of a deal it was to remove the CDV in those cars and it has been very well discussed. If you think your car is fine and perfect and doesent need this mod, it’s only because you haven’t felt the difference of a car with the modified cdv. Do not try powershifting these cars without modifying the CDV like mentioned above, I garuntee you the clutch will slip and if doing it constantly you will need a new clutch soon. To each their own, just trying to help the community and have people feel how much better the clutch can get with such a simple mod. Car will Not have any negative effect and will not void the warranty because it is visually undetectable.

NickyC · 05-11-2018, 05:53 PM

Quote:

Originally Posted by G35POPPEDMYCHERRY

lol I drive the car like butter. shit even in sports plus. learn the nature of the car. dont fight it

Agreed, I drive in nothing but Sports Plus because I hate that kick down bullshit. This car has one of the smoothest manual transmissions I've ever owned.

rvacha · 05-11-2018, 09:00 PM

I've driven E39 540s, E39 M5s and E9X M3s with and without CDVs. I think I know what I'm missing, which is not much. Never trashed a clutch even though the forums used to "say” I should without this mod. If you don't experience violence when dropping the clutch with a CDV you perhaps have other problems. IMHO all it does is take the "edge" off in much the same way that 4Ss are a little less edgier than PS2s

All IMHO of course....

Disclaimer: I've never dropped the clutch on an F8X... Yet...

CSBM5 · 06-26-2018, 10:07 AM

Quote:

Originally Posted by rvacha

I've driven E39 540s, E39 M5s and E9X M3s with and without CDVs. I think I know what I'm missing, which is not much. Never trashed a clutch even though the forums used to "say” I should without this mod. If you don't experience violence when dropping the clutch with a CDV you perhaps have other problems. IMHO all it does is take the "edge" off in much the same way that 4Ss are a little less edgier than PS2s

All IMHO of course....

Disclaimer: I've never dropped the clutch on an F8X... Yet...

Out of the three you mentioned, on the 540i had a CDV. The E39 M5 and E9x M3 do not have one.

spdandpwr · 06-26-2018, 02:42 PM

At the people who say driving this car is cake: I'm sorry, but any sort of throttle modulation gets this car in a tizzy. The power is surges and gives you that buckin' feeling in sport plus. Efficient helps, but if you go on and off the power, the car doesn't like it one bit. I've driven BMWs of yore, the 1st to 2nd can definitely be smooth, but when driving spiritedly, it's not that smooth. Heck, Car and Driver themselves admit it in their review. I'd take their opinion over someone on the board any day.

05-10-2018, 04:43 PM	#1
TurboAra Enlisted Member 51 Rep 40 Posts Drives: 2013 335i Join Date: Aug 2017 Location: Northridge,CA iTrader: (0)	Clutch Delay Valve Found!! 6 speed cars Hey guys, I wanted to share this awesome discovery. I did his mod on my F30 but the f80 and F82 uses the same components to operate the clutch including the slave. Drilling out the clutch delay valve changed the whole feel of the car and driving experience. Please take the time to read on thread is here. http://f30.bimmerpost.com/forums/sho....php?t=1486773
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05-10-2018, 05:58 PM	#2
ByeFelicia Captain 399 Rep 852 Posts Drives: F80 Join Date: Sep 2014 Location: . iTrader: (2)	Someone told me this is a "must" do sort of thing for a six speed in BMW I have trouble getting smooth shifts from 1-2nd in sport + consistently. (I am not a seasoned vet in manual driving) Will this removing this, for sure make the 1-2 shift smoother and more consistent? Judging by that first post on your link (also no jerking when normally driving and shifting from 1st to 2nd.) I would assume so.
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05-10-2018, 06:14 PM	#3
doug_999 Brigadier General 2545 Rep 3,968 Posts Drives: 2011 1M/2021 992/2023 X3 Join Date: Mar 2008 Location: Chicago, IL iTrader: (0)	I don't believe the M3/M4 has this. http://f80.bimmerpost.com/forums/sho....php?t=1148072 __________________ 2011 1M, Black loaded sans sat radio 2021 911 C4S Gentian Blue, manual 2023 X3 M40i - loaded sans Park Assist
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05-10-2018, 06:17 PM	#4
ByeFelicia Captain 399 Rep 852 Posts Drives: F80 Join Date: Sep 2014 Location: . iTrader: (2)	Interesting. I get my car worked on at a very reputable shop and was told yes. F8X manual do have them.
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05-10-2018, 07:03 PM	#5
AndyLu First Lieutenant 93 Rep 332 Posts Drives: F80 m3 Join Date: Mar 2015 Location: cincinnati iTrader: (0)	I believe this has been covered but I can be wrong
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05-10-2018, 10:37 PM	#7
ByeFelicia Captain 399 Rep 852 Posts Drives: F80 Join Date: Sep 2014 Location: . iTrader: (2)	Yes, im aware. I drive in this mode to drive in no nanny mode and get a better feel for no assist manual.
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05-10-2018, 11:23 PM	#9
rr006rbc Colonel 1205 Rep 2,818 Posts Drives: '23 M440i GC Join Date: Mar 2013 Location: California iTrader: (38)	Not sure why everyone has issues shifting thru gears in their F8X. This is my second manual M3 with the first being a 2015 and I couldn't be happier with how the gearbox shift quality is.. Your left foot probably sucks in modulating the clutch?
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05-11-2018, 12:33 AM	#11
G35POPPEDMYCHERRY Banned 4999 Rep 4,139 Posts Drives: F80 Join Date: Dec 2015 Location: Philadelphia iTrader: (1)	lol I drive the car like butter. shit even in sports plus. learn the nature of the car. dont fight it
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05-11-2018, 12:53 PM	#13
DWEI First Lieutenant 161 Rep 299 Posts Drives: 2018 M3 Join Date: Apr 2018 Location: Orange County iTrader: (2)	I've been driving MT for the past 15 years and 35 cars. IMO The F8x transmission has one of the better gear boxes or there. I have no issues smoothly going through gears. But to each thier own. Does this mod negatively effect the car somehow? __________________ Thin Blue Line
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05-11-2018, 05:46 PM	#18
TurboAra Enlisted Member 51 Rep 40 Posts Drives: 2013 335i Join Date: Aug 2017 Location: Northridge,CA iTrader: (0)	there is no CDV as a separate part, it is located inside he Slave cylinder and is there no matter how many M badges are on the car. If any of you have owned a E90/E92 car with a manual gearbox you would know how big of a deal it was to remove the CDV in those cars and it has been very well discussed. If you think your car is fine and perfect and doesent need this mod, it’s only because you haven’t felt the difference of a car with the modified cdv. Do not try powershifting these cars without modifying the CDV like mentioned above, I garuntee you the clutch will slip and if doing it constantly you will need a new clutch soon. To each their own, just trying to help the community and have people feel how much better the clutch can get with such a simple mod. Car will Not have any negative effect and will not void the warranty because it is visually undetectable.
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05-11-2018, 09:00 PM	#20
rvacha Captain 62 Rep 800 Posts Drives: '08 E92 M3 Join Date: Mar 2007 Location: Cleveland, OH iTrader: (0) Garage List 2008 E92 M3 [0.00]	I've driven E39 540s, E39 M5s and E9X M3s with and without CDVs. I think I know what I'm missing, which is not much. Never trashed a clutch even though the forums used to "say” I should without this mod. If you don't experience violence when dropping the clutch with a CDV you perhaps have other problems. IMHO all it does is take the "edge" off in much the same way that 4Ss are a little less edgier than PS2s All IMHO of course.... Disclaimer: I've never dropped the clutch on an F8X... Yet... __________________ '16 F30 340i xDrive 6MT Melbourne/Black '08 E92 M3 6MT Jerez/Speed Cloth '18 F80 M3 6MT SO/CSAT Last edited by rvacha; 05-11-2018 at 09:15 PM..
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06-26-2018, 02:42 PM	#22
spdandpwr Captain 443 Rep 650 Posts Drives: 2022 BMW X3 M Comp Join Date: Oct 2017 Location: USA iTrader: (0)	At the people who say driving this car is cake: I'm sorry, but any sort of throttle modulation gets this car in a tizzy. The power is surges and gives you that buckin' feeling in sport plus. Efficient helps, but if you go on and off the power, the car doesn't like it one bit. I've driven BMWs of yore, the 1st to 2nd can definitely be smooth, but when driving spiritedly, it's not that smooth. Heck, Car and Driver themselves admit it in their review. I'd take their opinion over someone on the board any day.
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