Experienced the M, it was jerky

kappa88af · 08-07-2007, 01:28 PM

I am torned between the 3.0si and a M. The si seemed to transition through the gears a lot smoother. On the other hand, the M was jerky 1st to 2nd (low speed driving). Is this typical with high performance vehicles or is this something I will get use to after driving a lot and knowing the characteristics of the car.:rocks:

F87LUV · 08-07-2007, 01:35 PM

Ive heard that the M is rather twitchy, seems to be a main complaint about it.

killjohnnyforan · 08-07-2007, 03:16 PM

its a performance car, if you value a truely smooth ride, go automatic, know what you're getting yourself into

Rick Hunter · 08-07-2007, 03:28 PM

I find the M to be one of the easiest cars to drive. It IS twitchy at first, but after a couple of days, you'll be able to shift it smoothly. The car begs to be driven, so you can't feather it and expect it not to balk back at you. I don't have any issues with it jerking anymore. I use mine as a daily driver, and it's a dream.

Some people have done the CDV delete to help with the twitchiness.

Dammmittt · 08-07-2007, 07:14 PM

Quote:

Originally Posted by Rick Hunter

I find the M to be one of the easiest cars to drive. It IS twitchy at first, but after a couple of days, you'll be able to shift it smoothly. The car begs to be driven, so you can't feather it and expect it not to balk back at you. I don't have any issues with it jerking anymore. I use mine as a daily driver, and it's a dream.

Some people have done the CDV delete to help with the twitchiness.

I'd have to agree with rick. At first I had issues launching the car at a moderate speed, I'd either have to haul ass or start from a crawl, cuz anything else was a bump-fest. I think the issue lies with the CDV as well, but once you get used to it, it's smooth as hell. I think that my ///M is much smoother than any auto I've ever driven. But then again, I do have the "Driver" mod.

enfield · 08-07-2007, 08:28 PM

The CDV is the culprit. I have a modified one sitting at home but I am thinking of not replacing mine because I am used to the original one....

My shifts are very smooth now. My foot has compensated for the CDV

TopDown · 08-07-2007, 11:20 PM

Quote:

Originally Posted by Rick Hunter

I find the M to be one of the easiest cars to drive. It IS twitchy at first, but after a couple of days, you'll be able to shift it smoothly. The car begs to be driven, so you can't feather it and expect it not to balk back at you. I don't have any issues with it jerking anymore. I use mine as a daily driver, and it's a dream.

+1

Daily driver, daily funster

inTgr8r · 08-08-2007, 06:43 AM

Quote:

Originally Posted by enfield

The CDV is the culprit. I have a modified one sitting at home but I am thinking of not replacing mine because I am used to the original one....

My shifts are very smooth now. My foot has compensated for the CDV

Yeah... but you're getting a big dent on the passenger side dashboard.
......from all the head bobbing.

155MPH · 08-08-2007, 07:52 AM

twitchy? Never. Fun? Hell yes.

kappa88af · 08-08-2007, 11:49 AM

Thanks for the replies guys and gals. I don't think I will let the jerkiness discourage me from the M. I think it will just get smoother as I spend more time behind the wheel.

inTgr8r · 08-08-2007, 12:45 PM

Quote:

Originally Posted by kappa88af

Thanks for the replies guys and gals. I don't think I will let the jerkiness discourage me from the M. I think it will just get smoother as I spend more time behind the wheel.

If it's jerkiness while engaging the clutch that you're referring to.....
It's definitely the CDV that you're experiencing.

Basically you're letting the clutch out faster than the CDV will let the fluid flow.
You will have to feather it out a little more or remove/replace the CDV

I chose the later & love the change. :rocks:

kappa88af · 08-08-2007, 01:16 PM

CDV, just got off of www.zeckhausen.com, for $35 plus shipping I can solve this problem. Awesome. Now my question is, although it is probably an easy DIY, will BMW install for me without voiding the warranty.

inTgr8r · 08-08-2007, 01:26 PM

IIRC, Some owners have had the dealer do the re&re.
I had mine done by an independent tech.

pbdm4k · 08-08-2007, 01:45 PM

Quote:

Originally Posted by kappa88af

CDV, just got off of www.zeckhausen.com, for $35 plus shipping I can solve this problem. Awesome. Now my question is, although it is probably an easy DIY, will BMW install for me without voiding the warranty.

I would say it REALLY depends on your BMW dealership. Some won't even go near mods and would be suspiscious everytime you came in if they find ur a nutty car modder. Luckily for me I have family that works at the dealership and they just look the other way for any mods that may affect the warranty.

I say your best bet would be to get an independant tech to do it or do it yourself. Unless you are uncomfortable with letting your lines bleed a bit of fluid.

I got my CDV in hand and have still yet to find a good weekend to crawl under the car...

GP20 · 08-08-2007, 01:46 PM

Quote:

Originally Posted by kappa88af

CDV, just got off of www.zeckhausen.com, for $35 plus shipping I can solve this problem. Awesome. Now my question is, although it is probably an easy DIY, will BMW install for me without voiding the warranty.

Unless you have a great relationship with the dealer and they tell you upfront that they won't void your warranty, they mostly likley would void your transmission warranty altogether - unless they forget to. Best way is to find a reputable local independent shop that services BMW's; it'll be cheaper going this route too.

maxz4 · 08-08-2007, 03:00 PM

I have to go try one at the dealer... it sounds like a lot of fun... I have only driven a 300+HP car once in my life.

inTgr8r · 08-08-2007, 03:23 PM

Quote:

Originally Posted by maxz4

I have to go try one at the dealer... it sounds like a lot of fun... I have only driven a 300+HP car once in my life.

Don't try it unless you're prepared to drive it home.

Artz 330 · 08-08-2007, 05:20 PM

hmm, the car is fine for me Pre and Post CDV. Its all about timing the gears and clutch.

zoomzoomers · 08-09-2007, 06:35 PM

Anyone have a DIY link for the CDV mod? Thanks.

ZilberGrau ZHP · 08-09-2007, 11:15 PM

Agree with those who say that it is maybe "stiff" or "twitchy" at first but not only do you get used to it you learn to appreciate the directness of it all. Also BMWs get smoother over time like wine- after a while driving any other car will feel flabby and soft. Go for the M if you can afford it and you will never regret it

Rick Hunter · 08-10-2007, 12:36 AM

Quote:

Originally Posted by inTgr8r

Don't try it unless you're prepared to drive it home.

X2! maxz4, you have been warned...

Aebous · 08-10-2007, 12:24 PM

http://www.z4-forum.com/forum/viewto...&highlight=cdv

This one was on the M How too, dunno if it's different between a M an non M though.

08-07-2007, 01:28 PM	#1
kappa88af New Member 9 Rep 11 Posts Drives: Z4 looking Join Date: May 2007 Location: Woodbridge, VA iTrader: (0)	Experienced the M, it was jerky I am torned between the 3.0si and a M. The si seemed to transition through the gears a lot smoother. On the other hand, the M was jerky 1st to 2nd (low speed driving). Is this typical with high performance vehicles or is this something I will get use to after driving a lot and knowing the characteristics of the car.:rocks:
	Appreciate 0 Tweet Quote

08-07-2007, 01:35 PM	#2
F87LUV Lieutenant General 3689 Rep 15,081 Posts Drives: '16 M2, '23 GT4 Join Date: May 2007 Location: NJ iTrader: (4) Garage List 2023 Porsche GT4 [5.00] 2016 BMW M2 [8.66]	Ive heard that the M is rather twitchy, seems to be a main complaint about it. __________________ IG: Trackinheels
	Appreciate 0 Quote

08-07-2007, 03:16 PM	#3
killjohnnyforan First Lieutenant 29 Rep 339 Posts Drives: ///M Coupe Join Date: Jun 2007 Location: NY iTrader: (1)	its a performance car, if you value a truely smooth ride, go automatic, know what you're getting yourself into
	Appreciate 0 Quote

08-07-2007, 03:28 PM	#4
Rick Hunter Skull Squadron Leader 307 Rep 2,031 Posts Drives: '07 M Coupé & '16 435xi GCoupé Join Date: May 2007 Location: The Emerald City iTrader: (20)	I find the M to be one of the easiest cars to drive. It IS twitchy at first, but after a couple of days, you'll be able to shift it smoothly. The car begs to be driven, so you can't feather it and expect it not to balk back at you. I don't have any issues with it jerking anymore. I use mine as a daily driver, and it's a dream. Some people have done the CDV delete to help with the twitchiness. __________________
	Appreciate 0 Quote

08-07-2007, 08:28 PM	#6
enfield Civilian 79 Rep 970 Posts Drives: Jaguar F-Type V8 S Join Date: May 2007 Location: Ontario iTrader: (0)	The CDV is the culprit. I have a modified one sitting at home but I am thinking of not replacing mine because I am used to the original one.... My shifts are very smooth now. My foot has compensated for the CDV
	Appreciate 0 Quote

08-08-2007, 07:52 AM	#9
155MPH Major 61 Rep 1,379 Posts Drives: E89 Z4 sDrive28i M Performance Join Date: May 2007 Location: South Jersey Shore iTrader: (0) Garage List 2019 BMW xDrive430i ... [0.00] 2014 BMW Z4 sDrive2 ... [5.00]	twitchy? Never. Fun? Hell yes.
	Appreciate 0 Quote

08-08-2007, 11:49 AM	#10
kappa88af New Member 9 Rep 11 Posts Drives: Z4 looking Join Date: May 2007 Location: Woodbridge, VA iTrader: (0)	Thanks for the replies guys and gals. I don't think I will let the jerkiness discourage me from the M. I think it will just get smoother as I spend more time behind the wheel.
	Appreciate 0 Quote

08-08-2007, 01:16 PM	#12
kappa88af New Member 9 Rep 11 Posts Drives: Z4 looking Join Date: May 2007 Location: Woodbridge, VA iTrader: (0)	CDV, just got off of www.zeckhausen.com, for $35 plus shipping I can solve this problem. Awesome. Now my question is, although it is probably an easy DIY, will BMW install for me without voiding the warranty.
	Appreciate 0 Quote

08-08-2007, 01:26 PM	#13
inTgr8r Lieutenant General 2432 Rep 11,667 Posts Drives: M2 Comp Join Date: Mar 2006 Location: Toronto iTrader: (10)	IIRC, Some owners have had the dealer do the re&re. I had mine done by an independent tech. __________________ '21 M2C Hockenheim Silver '18 718 Cayman S Lava Orange (sold) '13 E92 M3 Santorini Blue (sold) '07 Z4 M Coupe Alpine White (sold)
	Appreciate 0 Quote

08-08-2007, 03:00 PM	#16
maxz4 Private First Class 4 Rep 118 Posts Drives: Z4 Join Date: Aug 2007 Location: Phoenix, AZ iTrader: (0)	I have to go try one at the dealer... it sounds like a lot of fun... I have only driven a 300+HP car once in my life.
	Appreciate 0 Quote

08-08-2007, 05:20 PM	#18
Artz 330 Colonel 196 Rep 2,486 Posts Drives: Z4M, 335i, 135i Join Date: Dec 2005 Location: Lawrenceville, NJ iTrader: (4) Garage List 2006 330i [0.00]	hmm, the car is fine for me Pre and Post CDV. Its all about timing the gears and clutch. __________________
	Appreciate 0 Quote

08-09-2007, 06:35 PM	#19
zoomzoomers Enlisted Member 5 Rep 37 Posts Drives: 2007 Z4 3.0si 6MT Join Date: May 2007 Location: So Cal iTrader: (0)	Anyone have a DIY link for the CDV mod? Thanks. __________________ Willing is not enough, we must do. Knowing is not enough, we must apply. Bruce Lee
	Appreciate 0 Quote

08-09-2007, 11:15 PM	#20
ZilberGrau ZHP Captain 177 Rep 679 Posts Drives: 435GC MGray, 330 ZHP (Wifes), Join Date: Jul 2007 Location: San Antonio, TX iTrader: (0)	Agree with those who say that it is maybe "stiff" or "twitchy" at first but not only do you get used to it you learn to appreciate the directness of it all. Also BMWs get smoother over time like wine- after a while driving any other car will feel flabby and soft. Go for the M if you can afford it and you will never regret it
	Appreciate 0 Quote

08-10-2007, 12:24 PM	#22
Aebous The Rambler 7 Rep 157 Posts Drives: 03 3.0l Z4 sports package Join Date: Jun 2007 Location: Las Vegas iTrader: (0)	http://www.z4-forum.com/forum/viewto...&highlight=cdv This one was on the M How too, dunno if it's different between a M an non M though. __________________ "Without engine maintainers pilots are nothing but pedestrians with cool leather jackets and sunglasses" "Be polite, be professional, but have a plan to kill everyone you meet" -Marine rule of gunfighting
	Appreciate 0 Quote