THE LARGEST BMW 2-SERIES FORUM ON THE PLANET
2Addicts
2Addicts
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
2Addicts | BMW 2-Series forum Technical Topics N55 (M235i) Engine, Transmission, Exhaust, Tuning Clutch delay valve?

Post Reply
 
Thread Tools Search this Thread
      10-26-2014, 12:00 AM   #1
TTBear
Captain
TTBear's Avatar
415
Rep
860
Posts

Drives: '20 Huracán/'19 M2Comp/'23 X4M
Join Date: Apr 2007
Location: Canada

iTrader: (6)

Clutch delay valve?

Thanks for all of your help, guys.

I just picked up my new M235i, which will be used as a daily driver. So far, it is awesome!!

One question, however - I searched everywhere, and could not ascertain whether the M235i has a CDV or not? Driving the car, it feels different than my 135i, on which I replaced the CDV with a bored-out version. The M235i clutch does feel like there is some lag with clutch engagement, like there could well be a CDV in there

Can anyone confirm/refute? I would be grateful for any input.


Cheers!
__________________
"Anima sana in corpore sano"
Appreciate 0
      10-27-2014, 10:31 PM   #2
TTBear
Captain
TTBear's Avatar
415
Rep
860
Posts

Drives: '20 Huracán/'19 M2Comp/'23 X4M
Join Date: Apr 2007
Location: Canada

iTrader: (6)

Nobody? Almost 200 views, and nobody knows for certain whether the M235i has a CDV or not?

Bueller? Bueller?
__________________
"Anima sana in corpore sano"
Appreciate 0
      10-27-2014, 11:01 PM   #3
FC4
Brigadier General
2644
Rep
3,393
Posts

Drives: Yes
Join Date: May 2014
Location: US

iTrader: (0)

There is a CDV which accomplishes the same thing, but it's not one which can be fitted with a bored out or modified version like older BMWs.
Appreciate 0
      10-27-2014, 11:11 PM   #4
TTBear
Captain
TTBear's Avatar
415
Rep
860
Posts

Drives: '20 Huracán/'19 M2Comp/'23 X4M
Join Date: Apr 2007
Location: Canada

iTrader: (6)

Quote:
Originally Posted by FC4 View Post
There is a CDV which accomplishes the same thing, but it's not one which can be fitted with a bored out or modified version like older BMWs.
Thanks for the reply!

It's not bad (tons better than the previous BMWs that we've owned), but it still bothers, somewhat. No big deal in the long run.

Can you elaborate? I searched the parts diagrams on realoem.com, but could find nothing.

Cheers!
__________________
"Anima sana in corpore sano"
Appreciate 0
      10-28-2014, 11:13 AM   #5
///MCFC
Second Lieutenant
30
Rep
242
Posts

Drives: M235i
Join Date: Aug 2014
Location: Flyover state

iTrader: (0)

the clutch delay is annoying in comfort mode...it makes heel/toe very awkward. the good news is that clutch response in sport and sport+ is much better.
Appreciate 0
      10-28-2014, 12:02 PM   #6
TTBear
Captain
TTBear's Avatar
415
Rep
860
Posts

Drives: '20 Huracán/'19 M2Comp/'23 X4M
Join Date: Apr 2007
Location: Canada

iTrader: (6)

Quote:
Originally Posted by ///MCFC View Post
the clutch delay is annoying in comfort mode...it makes heel/toe very awkward. the good news is that clutch response in sport and sport+ is much better.
Really? Interesting. I just picked up my M235i three days ago, so haven't had a chance to drive it aggressively.

I wonder how Sport/Sport+ mode would affect clutch take up? My impression is that the valve only allows fluid through at a set rate, or do you mean that the throttle response is changed, and the Sport mapping for the throttle suits heel and toeing better?

Curious. Must go out and try it today. Thanks.
__________________
"Anima sana in corpore sano"
Appreciate 0
      10-28-2014, 12:16 PM   #7
///MCFC
Second Lieutenant
30
Rep
242
Posts

Drives: M235i
Join Date: Aug 2014
Location: Flyover state

iTrader: (0)

Quote:
Originally Posted by TTBear View Post
Really? Interesting. I just picked up my M235i three days ago, so haven't had a chance to drive it aggressively.

I wonder how Sport/Sport+ mode would affect clutch take up? My impression is that the valve only allows fluid through at a set rate, or do you mean that the throttle response is changed, and the Sport mapping for the throttle suits heel and toeing better?

Curious. Must go out and try it today. Thanks.
could be throttle response, I guess, but it does feel like there is a clutch delay in certain situations in comfort mode, e.g. 1-2 upshift.
Appreciate 0
      10-28-2014, 03:09 PM   #8
TB///M3
First Lieutenant
United_States
76
Rep
389
Posts

Drives: 16 ///M3
Join Date: Mar 2014
Location: Northern Nj

iTrader: (0)

To me there's a noticeable clutch engagement feel between comfort and sport.
Which leads me to believe this guy who works for BMW that the CDV could be electronic and not mechanical like the 135i.
Appreciate 0
      10-28-2014, 05:23 PM   #9
TTBear
Captain
TTBear's Avatar
415
Rep
860
Posts

Drives: '20 Huracán/'19 M2Comp/'23 X4M
Join Date: Apr 2007
Location: Canada

iTrader: (6)

I emailed Dave Z. at zeckhausen.com, who modify CDVs for most BMWs.

Awesome guy - he replied almost immediately, and said he believes that BMW has incorporated the CDV into the "Output cylinder" (see diagram below - part number 14).

He also said he would bring in the part, and see if they could do a CDV delete on it. Wow, that's service. I'll post up anything else that I find.

I don't find the CDV that intrusive, but if I could improve it somewhat, I'm all for it.


__________________
"Anima sana in corpore sano"
Appreciate 0
      12-09-2014, 10:08 PM   #10
BMW335iOn18s
Resident BMW Fanboy
BMW335iOn18s's Avatar
United_States
259
Rep
866
Posts

Drives: F82 CS SMB
Join Date: Jul 2007
Location: Philadelphia, PA

iTrader: (0)

Any updates?
__________________
Current: '20 F82 M4cs SMB / '13 640i M-Sport Carbon Black
Past: F30 330xi Luxury Line / F22 M235i 6MT / E92 335i / E46 330ci / E36 328i 5MT
Appreciate 0
      12-12-2014, 07:17 AM   #11
TTBear
Captain
TTBear's Avatar
415
Rep
860
Posts

Drives: '20 Huracán/'19 M2Comp/'23 X4M
Join Date: Apr 2007
Location: Canada

iTrader: (6)

Quote:
Originally Posted by BMW335iOn18s View Post
Any updates?
None that I have been able to discern.

I don't find the clutch action on the M235 to be as objectionable as our Z4 M Roadster, or the e92 M3, but I do still notice a bit of a lag in clutch engagement when trying to shift gears quickly.

If I HAD to live with it, I'd be OK with it, I guess
__________________
"Anima sana in corpore sano"
Appreciate 0
      12-13-2014, 02:04 PM   #12
BMW335iOn18s
Resident BMW Fanboy
BMW335iOn18s's Avatar
United_States
259
Rep
866
Posts

Drives: F82 CS SMB
Join Date: Jul 2007
Location: Philadelphia, PA

iTrader: (0)

Did you get the eBay/BSM clutch stop? That made the car SOO much nicer to drive! I installed mine without any of the additional washers...
__________________
Current: '20 F82 M4cs SMB / '13 640i M-Sport Carbon Black
Past: F30 330xi Luxury Line / F22 M235i 6MT / E92 335i / E46 330ci / E36 328i 5MT
Appreciate 0
      12-14-2014, 02:33 PM   #13
TTBear
Captain
TTBear's Avatar
415
Rep
860
Posts

Drives: '20 Huracán/'19 M2Comp/'23 X4M
Join Date: Apr 2007
Location: Canada

iTrader: (6)

Quote:
Originally Posted by BMW335iOn18s
Did you get the eBay/BSM clutch stop? That made the car SOO much nicer to drive! I installed mine without any of the additional washers...
I did purchase the clutch stop, but found it didn't make a massive difference. My issue is with the rate of clutch engagement and not so much the initial take-up point.
I live in hope.....
__________________
"Anima sana in corpore sano"
Appreciate 0
      09-03-2015, 07:28 PM   #14
persianbmw91
Private First Class
49
Rep
139
Posts

Drives: 1M
Join Date: Oct 2009
Location: bethesda

iTrader: (1)

no solutions yet?
Appreciate 0
      09-09-2015, 09:36 PM   #15
Pparana
Captain
463
Rep
957
Posts

Drives: 2015 m235i
Join Date: Oct 2014
Location: Jacksonville Fl

iTrader: (1)

The ultimate clutch pedal is a very worthwhile investment. Looked also at that part, it's all in one now. Do not think there is an easy solution
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 10:39 AM.




2addicts
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST