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BMW 3-Series (E90 E92) Forum
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DIY - E92 CDV (Clutch Delay Valve) Removal
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06-11-2007, 02:08 PM | #155 | |
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06-11-2007, 03:05 PM | #156 |
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06-11-2007, 07:16 PM | #157 |
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Hmmm... I wonder if I should have went with a vac bleeder like that instead. Oh well, my bavauto pressure bleeder was shipped out today, hopefully i'll have it in a few days. So, does anyone know if I should fill the pressure bleeder with fluid or should I just do it with air?
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06-13-2007, 11:00 PM | #158 |
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I did a CDV delete yesterday and wanted share my opinion…
Despite owning 4 different manual transmission cars for a total of over 12 years I immediately had trouble executing a smooth shift in my 335 in the lower gears. After a few hundred miles I learned to shift the 335 smooth by delaying the lift of my foot off the throttle. Problem is that I had to make a conscious effort to do this or I’d go right back to my old timing. After reading about the CDV delete I had to try it, and let me tell you it instantly made a difference. I’m not an automotive engineer, but my theory is without the CDV restriction the clutch can now reengage before the flywheel slows down too much…making the revs match just right. (Otherwise you would have to think that a slow clutch engagement would be smoother) Now I don’t have to give shifting a second thought it’s just snick-snick every time! I highly recommend this mod for anyone experiencing the same shift timing problems that I did. (And who can tolerate the risk of the extra wear and tear on the driveline). |
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06-16-2007, 02:24 PM | #159 |
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I finally had the time this morning to go out and bleed my clutch again (its been almost a week since the first time). Anyway, thanks to the members on here for giving me some info that I simply overlooked. I didn't realize that the brake reservoir was partitioned and that the clutch line can become empty rather quickly if you aren't constantly filling up the master cylinder in between each bleed. I ended up running it dry and filling up the line with air, which is why my clutch pedal fell to the floor, but I thought that it was filled since the rest of the reservoir was at the max line. Long story short, since I discovered this I was able to bleed my clutch with no problems and all is well now. Shifting feels great now, a lot more like my last car without a CDV. You can feel everything that is going on now. I'm happy. Thanks to everyone for the help.
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06-16-2007, 02:49 PM | #160 |
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Took mine out at the shop today... Easy 15 min max job... Night and day difference....
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06-16-2007, 03:13 PM | #161 | |
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06-16-2007, 03:55 PM | #162 |
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Good to hear Boostedbmw.
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06-16-2007, 04:26 PM | #163 |
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Thanks.
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06-19-2007, 04:16 PM | #164 |
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Swapped mine out today. Thanks to Evan for the excellent DIY instructions, and hope to see you on the streets of Columbia!
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06-19-2007, 04:34 PM | #165 | |
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06-19-2007, 07:12 PM | #166 |
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Evan, welcome to the area, and best of luck with the move.
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Berlina Black S2000 CR is now in the garage l 19" Rial Daytona Race l KW V2 l Eisenhaus Race Exhaust l |
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08-15-2007, 02:35 PM | #167 |
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this guide says the bleed valve is 8mm, what i found is more like 7/16th, furthermore, there is NO way for me to get any sort of wrench around it, i can barely get a socket around it, and its blakc not bronze like in your pciture
what gives (same place as in the picture and everything) |
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08-15-2007, 03:40 PM | #169 | |
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08-15-2007, 05:02 PM | #170 |
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um, did you read the part where i said more like i dont have a lot of metric tools so i used the closest imperial to measure it
the part you quoted, the cars are diffrent, the guy with the blue sesemi street character in his avatar had the same size, and ours were plastic not metal, and you have to give it a full turn for it to start bleeding am i to assume that since my clutch pedal returns to the up position properly that i bled it correctly? it was hard to tell since i have to give it a full turn to get it loose enough to bleed first impressions, clutch engagement is pretty much the same, a little more informative but thats about it (nothing like the other cars i have driven that give tons of feedback) what IS a ton different is when your moving out of gear, throwing the clutch in immediately takes pressure off the gearshift |
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08-16-2007, 05:59 AM | #171 |
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Done and it's not a noticable difference. Thanks to Technical Dimensions is Jacksonville, FL. 721-9700 for you local boys and girls.
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08-16-2007, 07:28 PM | #172 |
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little update, theres a dif one quick engagements when im shifting from high revs, in that before when the clutch was all the way out it would sort of "twist up" and mushy the power
but theres no extra feeling in clutch engagement which is what i was hoping for |
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08-17-2007, 07:55 AM | #173 |
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I notice more feel in the transmission during shifting; more "snick-snick" in and out of the gears. The clutch grabs a little more predictably, so I think that I am adjusting my style to use less clutch disengagement. I like it.
I did not notice this before, but there is a sticky spot when the clutch pedal is fully depressed, like it's hanging up on something, feels like it's caught on the floor mat, or my shoe is stuck under something -- but it isn't, it's something internal.
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08-17-2007, 11:41 AM | #174 | |
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as for the "snick snick" thats a placebo, the CDV has nothing to do with the transmission itself, what it may be though is what i tried to describe where it goes out of gear faster, IE w/ CDV in when your toss the clutch in and pull it out of gear theres still some resistance against you compared to w/o the CDV because the tranny has had longer to spin down and remove tension |
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08-17-2007, 03:15 PM | #175 |
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is that company any good? who make the best CDV out there?
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08-20-2007, 12:08 PM | #176 |
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I just did my install this week end (girlfriend's car)and it was well worth it. After comparing the one that came off the car and the one I bought from the suplier listed on this thread, the "Modified" one only have it's guts removed.
I used a small screwdriver and punched the inside. A small metal plate with a hole came out and a plastic ring. Now it looks exactly like the modified one. I'm going to install that one on my 335 when it comes in October. |
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