[thecadman99]

So I don't have a CDV in my car, and its just a bit tough to get used to. I have 4 cars all with MT. I can jump in any of them and not have a problem, but when I get in my e90 after driving the others for a bit, I have to really watch the quick takeup of the clutch.

I'm wondering if anyone has found a CDV that isn't completely straight-through and offers just a bit of delay for those of us who are more interested in our cervical vertebrae than our 0-60 times?

[ndog14]

Remove the CDV.

[thecadman99]

Originally Posted by ndog14

Remove the CDV.

Lol I appreciate the input, but as per the first line of my post I already have mine removed- I'm wondering if anyone has tried something like drilling out the factory one just a tad larger.

[ndog14]

Putting the CDV back in would make it worse. The clutch is operated by hydraulics via the foot and clutch pedal. By putting the CDV in you are restricting the hydraulics so the clutch engages slower and causes jerkiness.

Why would you want to make it jerky?

[RupertPupkin]

This thread doesn't make sense. Maybe youre just unhappy with the cluth itself, the CDV is dumb and only is a negative. Putting it back even with a slightly drilled hole will be pointless.

[thecadman99]

Interesting that not a single professional review online (none that I could find anyhow) had anything bad to say about the stock clutch with CDV...

I guess no one has played around with the stock valve.

[ndog14]

Originally Posted by thecadman99

Interesting that not a single professional review online (none that I could find anyhow) had anything bad to say about the stock clutch with CDV...

I guess no one has played around with the stock valve.

What?

Everyone hates the CDV. The difference is night and day. What are these professional reviews you are reading? Links

[thecadman99]

Well lets see- I'm talking about my 330i of course, maybe the 335i reviews are different.

Car and driver says that both gearboxes "work beautifully" http://www.caranddriver.com/reviews/...330i-road-test

Car and driver long term review doesn't mention the clutch, and infact the Car and Driver staffer KC Colwell specifically mentions that he likes the factory clutch:
http://www.caranddriver.com/reviews/...d-raves-page-4

Edmunds long term review- their chief road test editor specifically mentions the clutch as part of a "cohesive experience designed with a driver-who-enjoys-driving in mind"
http://www.insideline.com/bmw/3-seri...-bmw-330i.html

Automobile magazines review calls the stock clutch a "typically fluid bmw clutch" http://www.automobilemag.com/reviews...i/viewall.html

There are plenty more that I don't feel like linking, especially since it has no basis on my original question-

Has anyone has played around with the original CDV in such a was as to increase the takeup speed without completely eliminating the valve?

[Efthreeoh]

There are a few companies on line that sell modified CDVs already drilled out. Shearch the topic in the forum, some discussed it years ago. It's not different than just connecting the hose directly to the slave.

[ndog14]

Putting a modded CDV is not going to make your problem go away, it will only make it worse.

I don't think the problem is with the car, but with the driver.

[Jdub679]

If you already have the CDV out or replaced with a straight-through unit, another modification is getting a bump stop. That should bring the take-up a little bit closer to the "bottom" and might just help.

The combination CDV + bump stop makes this car drive "normal."

[ndog14]

Bump stop? You mean clutch stop?

http://www.ebay.com/itm/E9X-BMW-CLUT...ht_2847wt_1393

It's the OP, not the car.

[thecadman99]

Originally Posted by ndog14

Putting a modded CDV is not going to make your problem go away, it will only make it worse.

I don't think the problem is with the car, but with the driver.

Oh well ndog14, I guess 24 years of driving sticks hasn't made me the AWESOME driver that you are...

I can drive my E90 fine, but I wish it felt more like my E36. Just wondering what others have done with their clutches.

I appreciate any constructive input but if your post it's only about trying to make yourself feel superior at the expense of others... really just keep it to yourself please.

[thecadman99]

Originally Posted by Jdub679

If you already have the CDV out or replaced with a straight-through unit, another modification is getting a bump stop. That should bring the take-up a little bit closer to the "bottom" and might just help.

The combination CDV + bump stop makes this car drive "normal."

Yeah thanks for the suggestion, I have a bump stop but I think it needs more adjusting, still seems to have to much over-travel. I'll have to try adjusting it out a bit more.

[bbbuzzy]

I have the modified CDV from Zeckhausen and love it. My 330i was strange with the CDV, the lag time between pedal release and engagement never synced with my right foot, and gear changes were mushy and sloppy. Put in the Zeckhausen unit and everything was fine again, just like other clutches I've had for 30 yrs of driving. What were they thinking?

[Jdub679]

Originally Posted by thecadman99

Yeah thanks for the suggestion, I have a bump stop but I think it needs more adjusting, still seems to have to much over-travel. I'll have to try adjusting it out a bit more.

I didn't realize they had that much adjustment in them, but I suppose in theory, as long as it's not too high to be a hindrance to clutch disengagement, you should be fine.

Also, with regard to the CDV delete... I think deleting it completely is the same as getting a cored out CDV. The only advantage to getting a modified one is that it will pass a visual inspection if someone were to look. If you get an opportunity to look inside the stock CDV when it comes out, you'll be surprised how narrow the opening really is compared with it open.

[ndog14]

Originally Posted by thecadman99

Oh well ndog14, I guess 24 years of driving sticks hasn't made me the AWESOME driver that you are...

I can drive my E90 fine, but I wish it felt more like my E36. Just wondering what others have done with their clutches.

I appreciate any constructive input but if your post it's only about trying to make yourself feel superior at the expense of others... really just keep it to yourself please.

In 24 years of driving stick you should know that all cars are different and require a special finesse, you can't make all cars like one another. And never did I say I was an awesome driver or some sort of driving-god, I just know how to adapt my left foot for E90s.

Putting a modified CDV in will still delay the actual clutch engagement compared to your foot. The point of removing the CDV is to improve actual clutch engagement to left foot movement, you're doing it backwards.

[MCOChuck]

My clutch chatters when it's cold, but even when it's warm the engaguagement point feels inconsistent. Looking forward to it wearing out and replacing it with something non OEM.

The CDV delete helped....maybe 20% better...still not great.

[thecadman99]

Originally Posted by Jdub679

I didn't realize they had that much adjustment in them, but I suppose in theory, as long as it's not too high to be a hindrance to clutch disengagement, you should be fine.

Also, with regard to the CDV delete... I think deleting it completely is the same as getting a cored out CDV. The only advantage to getting a modified one is that it will pass a visual inspection if someone were to look. If you get an opportunity to look inside the stock CDV when it comes out, you'll be surprised how narrow the opening really is compared with it open.

I don't think the ebay one has adjustment, but I made my own out of a threaded "foot". I can add a few washers to it to decrease overtravel (don't trust the thread to hold). I just don't want to go to far and have it slipping.

Mine is similar to Figure's as posted here: http://www.e90post.com/forums/showthread.php?t=651166

[thecadman99]

Originally Posted by MCOChuck

My clutch chatters when it's cold, but even when it's warm the engaguagement point feels inconsistent. Looking forward to it wearing out and replacing it with something non OEM.

The CDV delete helped....maybe 20% better...still not great.

How many miles you have on your 330 Chuck? I'm at 104000 on the original clutch.
I don't have any chattering, but 1-2 is still touchy, even with CDV deleted. Do you know anyone who has put in an aftermarket clutch?

[thecadman99]

Originally Posted by ndog14

In 24 years of driving stick you should know that all cars are different and require a special finesse, you can't make all cars like one another. And never did I say I was an awesome driver or some sort of driving-god, I just know how to adapt my left foot for E90s.

Putting a modified CDV in will still delay the actual clutch engagement compared to your foot. The point of removing the CDV is to improve actual clutch engagement to left foot movement, you're doing it backwards.

With that kind of thinking, why not just get used to your car with the CDV valve as it was from the factory? Just "finesse" it...

The forum is about discussing and possibly improving our cars. There is always room for new ideas. Discussion/innovation is the reason we know we can take the CDV valve out in the first place.