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      12-08-2008, 09:50 AM   #67
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interesting!
might have to try this out.
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      12-08-2008, 10:41 AM   #68
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Quote:
Originally Posted by CodeRed View Post
I completely disagree with your statement, as it was VERY obvious on my car...it made a distinct difference. Do you really think that BMW puts in fake CD valves? What purpose would that serve, as the part is unnecessary otherwise. Although, it still don't agree with why they put them in to begin with, as it really ruins the clutch action...then again I don't do "burn outs" or drag racing so they wouldn't have to be concerned with my type of use.
J08M3's correct - completely unnecessary:

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      12-08-2008, 11:19 AM   #69
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Quote:
Originally Posted by CatchM3 View Post
Hey folks, just need some clarification. can someone please tell me which spring it is using this diagram as a reference. Which number?

18. the one that kind of looks like a shock absorber.
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      12-08-2008, 01:34 PM   #70
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thanks JO8M3
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      12-08-2008, 07:48 PM   #71
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Can you post pictures of the process for us un-initiated?
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      12-08-2008, 08:08 PM   #72
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Quote:
Originally Posted by tom @ eas View Post
J08M3's correct - completely unnecessary:

Hard to draw a lot of conclusions from that photo, please elaborate on why it even exists then based upon you hypothesis?
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      12-08-2008, 08:59 PM   #73
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I suspect the feeling most people talk about the CDV causing is being mistaken for the feeling you get from the spring. The change in spring rate would give you a feeling in your foot that the clutch in engaging, but in fact it's really just a change in the pressure on your foot from the pedal. This is why it's hard to shift smooth with the spring still in. Just my guess after reading numerous threads about what the CDV is supposed to do.
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      12-09-2008, 12:13 AM   #74
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Quote:
Originally Posted by J08M3 View Post
I suspect the feeling most people talk about the CDV causing is being mistaken for the feeling you get from the spring. The change in spring rate would give you a feeling in your foot that the clutch in engaging, but in fact it's really just a change in the pressure on your foot from the pedal. This is why it's hard to shift smooth with the spring still in. Just my guess after reading numerous threads about what the CDV is supposed to do.
+1
I suspect your suspicion is correct.
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      12-09-2008, 02:28 AM   #75
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Not true at all...Having changed the CDV on my car, it is 100% different. This only applied if you're talking about what CDVs do in general. About the M3, I don't know.
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      12-09-2008, 07:31 AM   #76
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Quote:
Originally Posted by GewoW View Post
Not true at all...Having changed the CDV on my car, it is 100% different. This only applied if you're talking about what CDVs do in general. About the M3, I don't know.
Can you elaborate on the change without the CDV? Do you still have your pedal spring in or have you taken it out also?
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      12-09-2008, 12:20 PM   #77
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It's still there. The shifts are excessively smooth. It was practically impossible to get a super-smooth shift with the CDV installed from 1st to 2nd...and many times 2nd to 3rd was glitchy. The clutch was set to re-engage at a set maximum rate, so one didn't have complete control over when it re-engaged so a shift that would normally work out well did not. It was a pretty constrained CDV, and replacing it with a emptied one completely, and I mean COMPLETELY, changed the dynamics of the car. Ask anyone with a 335 that has done the mod.
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      12-09-2008, 12:40 PM   #78
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Quote:
Originally Posted by GewoW View Post
It's still there. The shifts are excessively smooth. It was practically impossible to get a super-smooth shift with the CDV installed from 1st to 2nd...and many times 2nd to 3rd was glitchy. The clutch was set to re-engage at a set maximum rate, so one didn't have complete control over when it re-engaged so a shift that would normally work out well did not. It was a pretty constrained CDV, and replacing it with a emptied one completely, and I mean COMPLETELY, changed the dynamics of the car. Ask anyone with a 335 that has done the mod.
A 335 and M3 are completely different in this sense, there are no restrictions on the valve in an e9X M3.
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      12-09-2008, 12:59 PM   #79
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Quote:
Originally Posted by GewoW View Post
It's still there. The shifts are excessively smooth. It was practically impossible to get a super-smooth shift with the CDV installed from 1st to 2nd...and many times 2nd to 3rd was glitchy. The clutch was set to re-engage at a set maximum rate, so one didn't have complete control over when it re-engaged so a shift that would normally work out well did not. It was a pretty constrained CDV, and replacing it with a emptied one completely, and I mean COMPLETELY, changed the dynamics of the car. Ask anyone with a 335 that has done the mod.
But we're talking about the M3 not the 335.
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      12-09-2008, 01:30 PM   #80
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the spring removal went smoothly. definitely an improvement
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      12-09-2008, 03:38 PM   #81
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Quote:
Originally Posted by J08M3 View Post
But we're talking about the M3 not the 335.
True, thank you for that...I mixed up 2 threads with very similar topics! Either way though, the M3 CDV may be less restricted, but unless someone changes it or removes it, and supports the idea that it's the same feeling with or without it, then I'll believe it's not restricted.
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      12-09-2008, 07:38 PM   #82
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Quote:
Originally Posted by CatchM3 View Post
the spring removal went smoothly. definitely an improvement
Glad to hear it worked out well...enjoy!!!
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      12-09-2008, 08:04 PM   #83
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Guys i did this mod today along with dropping the car on eibachs, will have pics of that tom along with a small review. But while I was at it I had them take out the spring and WOW. its sick. Night and day. Every shift is smooth as fcuck. LOL he took out the wrong spring at first, so he put it back and he took out the right one Im assuming, took a pic of it.

This is it right?


The lateral movement is nothing, barely even moves, this is seriously one of the most affective mods ive done so far.
Only down side of this is that its a bit stiffer now, just a bit harder to keep depressed, but when stop u should b in neutral anyway.....
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      12-09-2008, 09:46 PM   #84
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Yep, that's the right spring. Nope it doesn't provide lateral support. It just looks like it would cause it's big.

GewoW have you looked at the pic provided by Tom@EAS? Do you still not believe it's not restricted?
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      12-09-2008, 09:52 PM   #85
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Quote:
Originally Posted by CodeRed View Post
Hard to draw a lot of conclusions from that photo, please elaborate on why it even exists then based upon you hypothesis?
No idea - we just know its not a restriction.
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      12-10-2008, 12:30 AM   #86
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I did the free mod today as well.

So far, I guess after 3500 miles, I have already got used to it with the springs. Def felt the difference after the removal. Will have to start getting used to this new feeling again.

Anyway, I couldnt remove the top pin as it is blocked by the brake pedal. So I just leave it in there. Anyone know how to remove it?

Also, the clutch does feel a lil loose without the spring.
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      12-10-2008, 09:41 AM   #87
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Quote:
Originally Posted by J08M3 View Post
Yep, that's the right spring. Nope it doesn't provide lateral support. It just looks like it would cause it's big.

GewoW have you looked at the pic provided by Tom@EAS? Do you still not believe it's not restricted?
That picture in and of itself proves absolutely nothing..you can't see thru both of them can you??
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      12-10-2008, 08:56 PM   #88
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Quote:
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That picture in and of itself proves absolutely nothing..you can't see thru both of them can you??
I took the pic along with what Tom@eas said to be true.
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