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E36 /7 Z3 (1996-2002)
E36/7 Z3 roadster and coupe talk with our gurus here.

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  #1  
Old 09-30-2008, 06:27 AM
rlubocki rlubocki is offline
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Z4: ...?Is it me or is it the clutch?...

I have a concerning question. I have a '04 z4 3.0i6speed , had it for several months. On rare occacion (maybe twice a month) when I release the cluth from a standstill, I get a jerky acceleration. This does not happen often, but I am troubled when it does. Is it maybe because I dont rev enough RPM's and the engine is stalling? I try to keep my eyes on the tach when I am going from a standstill, but always miss it when it does happen. My factory warranty runs out this October and would like to fix if it is mechanical and not me.. Any thoughts?

Ps. I have replaced the CDV valve!

Last edited by rlubocki; 09-30-2008 at 07:25 AM.
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  #2  
Old 09-30-2008, 07:22 AM
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rjcoston rjcoston is offline
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Do a search for CDV or clutch delay valve in this forum for plenty of information.

http://www.zeckhausen.com/cdv.htm
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  #3  
Old 09-30-2008, 07:26 AM
rlubocki rlubocki is offline
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I bought it from you guys, and love the shifting!
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  #4  
Old 09-30-2008, 10:42 AM
Bimster Bimster is offline
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Odds are it's you if it's that rare. 1st gear is the most sensitive to clutch engagement. Wild guess...you're occasionally engaging the clutch with your heel off the floor or in a different position than normal.
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  #5  
Old 09-30-2008, 12:43 PM
rlubocki rlubocki is offline
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Bimster, As a matter a fact I dont use my heel that often, is that a good practice to learn? I guess there is a better control of the pedal if heel is used...
Thank you for your help!

RL
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  #6  
Old 09-30-2008, 01:36 PM
RichardTS RichardTS is offline
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Quote:
Originally Posted by Bimster View Post
Odds are it's you if it's that rare. 1st gear is the most sensitive to clutch engagement. Wild guess...you're occasionally engaging the clutch with your heel off the floor or in a different position than normal.
I have been driving manuals for 30 years and I have never left my heel on the floor when clutching. I also have not really had a problem with the CDV but I do admit that the M is one of the most difficult cars I have ever driven to get the 1-2 shift smooth.
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  #7  
Old 09-30-2008, 03:01 PM
rlubocki rlubocki is offline
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Smile

Richard, you learn something new every day, will make a habit with the heal situation, I should listen to my common sense... As to the shifting due to the valve, I had a replaced by dealer, and it makes a HUGE difference! Lots of people say that all M models do not have this problem...

Thanks for the lesson,
Robert
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  #8  
Old 09-30-2008, 08:23 PM
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withaJ withaJ is offline
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Quote:
Originally Posted by rlubocki View Post
As to the shifting due to the valve, I had a replaced by dealer, and it makes a HUGE difference! Lots of people say that all M models do not have this problem..
Just curious, what did you replace it with, another BMW CDV? In my MC, I took Ron Stygar's approach and just took the CDV off. Shifting was so much better/easier afterwards... My previous M3 was hard to get into 2nd gear at times, but the MC is noticeably harder.
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  #9  
Old 10-02-2008, 11:08 AM
rlubocki rlubocki is offline
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withaJ,


I bought midified CDV valve from http://www.zeckhausen.com/cdv.htm
They gutted the insides in the right fashion, and its like $35, I took it to my BMW dealer and they installed it for me free of charge. I feel a huge difference between 1st and second.
They tell you that you should have this valve, and modified will do the trick.

Robert
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  #10  
Old 10-02-2008, 06:08 PM
RichardTS RichardTS is offline
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Quote:
Originally Posted by rlubocki View Post
Richard, you learn something new every day, will make a habit with the heal situation, I should listen to my common sense... As to the shifting due to the valve, I had a replaced by dealer, and it makes a HUGE difference! Lots of people say that all M models do not have this problem...

Thanks for the lesson,
Robert
And I have been thinking more about this. I don't think that it is possible to push the clutch pedal all the way to the floor is you leave your heel on the floor. Unless you drag your heel on the floorboard. And you risk clutch longevity if you don't go all the way to the floor.

I can guarantee your clutch will last longer of you always go to the floor. As a matter of fact, the 30 years of manual driving was done in a 1973 MGB. If you look in this car you can see wear on the floor board where the clutch pedal lever has hit the floor. And the proof is in the pudding - I have replaced the clutch in this car only 3 times in 34 years of ownership. I doubt there are many people that can say they average over 11 years on a clutch.
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  #11  
Old 10-03-2008, 06:51 AM
rlubocki rlubocki is offline
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Richard,

Thank you for great advise!! You know I have been using the heel method in the past 2 days I feel I have better control of the cluch engagement, and shifting. Smoother everything, and better experience! There is more to driving, especially with sports cars....

Thanks again!
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  #12  
Old 10-03-2008, 08:47 AM
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ebruder ebruder is offline
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Quote:
Originally Posted by RichardTS View Post
I have been driving manuals for 30 years and I have never left my heel on the floor when clutching. I also have not really had a problem with the CDV but I do admit that the M is one of the most difficult cars I have ever driven to get the 1-2 shift smooth.

Like Richard, I have never left my heel on the floor when depressing the clutch, and it amazes me that some people might be able to do this. I know I have small feet, but I can't imagine how big a foot it would take to fully depress the clutch with heel on floor.

Unlike Richard, I did the CDV replacement and found a huge difference in the ease and smoothness of the take off and then 1-2 shifts in my MCoupe.

EB
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  #13  
Old 10-03-2008, 09:01 AM
Engineer Daddy Engineer Daddy is offline
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I just had the CDV replaced this week and what a difference. I never realized how much I actually had to consentrate on shifting before having this done. Now the shifts are smooth as butter, even the 1-2 shift is good for me.
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  #14  
Old 10-03-2008, 12:47 PM
deknight deknight is offline
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Quote:
Originally Posted by rlubocki View Post
withaJ,


I bought midified CDV valve from http://www.zeckhausen.com/cdv.htm
They gutted the insides in the right fashion, and its like $35, I took it to my BMW dealer and they installed it for me free of charge. I feel a huge difference between 1st and second.
They tell you that you should have this valve, and modified will do the trick.

Robert
Most people just remove the valve. I did this on my E39 M5 and now again on the Z4MC. What is the problem with just removing it, as opposed to installing the modified one.
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  #15  
Old 10-03-2008, 03:02 PM
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ebruder ebruder is offline
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Quote:
Originally Posted by deknight View Post
Most people just remove the valve. I did this on my E39 M5 and now again on the Z4MC. What is the problem with just removing it, as opposed to installing the modified one.
1) People (like me) don't want the dealership to see there was a delete in case there is a future need of warranty work on the drive train. This might help.

2) The line might get kinked if the line is not carefully reattached.

EB
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