So does the BavAuto Unlock Valve work?

[UNDR R8D]

Anyone ever try this little replacement?

I have noticed that the 1-2 shift is kind of sluggish, could be tied to this?

Worth it?






http://www.bavauto.com//assets/product_images/tool/unlock2.jpg

Unlock the performance potential of your clutch. Most standard- transmission BMWs 96 on have what’s known as a "lock valve" that slows the flow of hydraulic fluid during shifting. Its purpose is to dampen the engagement of the clutch so that no matter how quickly you let the clutch pedal out, you can’t dump it -- great for teaching a 15- year-old how to shift, but frustrating as heck for skilled drivers. No matter how hard you try, you can’t shift crisply or avoid clutch slippage. (Parallel parking is a drag, and going from 1st into 2nd is so jerky, your passengers look at you funny... once their heads stop bobbing.) One way to fix this problem is to simply remove the lock valve and force the metal hydraulic lines together. But this can crimp your lines and cause an annoying rattle. A better way is to use our "unlock valve." It’s a BMW lock valve with the restrictor removed. You’ll enjoy crisper shifts while maintaining the proper distance between the metal hydraulic lines and brackets (no crimped lines and no rattles). Available for most BMWs 96 on with standard transmission.
Part Number Description Price Qty. UNLOCK2 Bavarian Autosport Unlock Valve
$29.95

[themadhatter]

there is another vendor that sells a version this product with great results. I see no reason why you would not be happy with the results or from dealing with bavauto.

[skipm2k]

This is the infamous CDV. Search and you'll find more info than you'll ever want. It will cure the crappy shifting. A short shift kit is part two of the solution. Rogue or UUC.

[RobertFontaine]

Why pay for this when you can just remove it?

[UNDR R8D]

This is the infamous CDV. Search and you'll find more info than you'll ever want. It will cure the crappy shifting. A short shift kit is part two of the solution. Rogue or UUC.
I did search, however not for CDV.

Not really looking for a SSK, I am not drag racing it.

[UNDR R8D]

Why pay for this when you can just remove it?
Because I am not a cheap ass hack? :dunno

[UNDR R8D]

there is another vendor that sells a version this product with great results. I see no reason why you would not be happy with the results or from dealing with bavauto.

I have heard nothing but good things from Bav Auto.

Thanks!

[RobertFontaine]

What cheap ass hack? remove the CDV. Both sides are correctly threaded. Reattach and problem solved. CDV is the hack.

[E92!Dreier]

Anyone who removes the CDV in its entirety is asking for trouble. The change in tension on the hydraulic lines can lead to premature wear and/or crimping. Also the CDV "delete" from Bavauto is the exact same oem piece that was meant for your car, only it has had the delay valve removed. The only reason I have not swapped it in is because I cold-called 3 BMW dealerships (out of state, not my own) and said that I was thinking about bringing my car in for them to do this modification. Every single service advisor said this is the first thing they check when they do any service to the driveline. If they find any signs of modification, they notate it on the bill they present you (no warranty coverage). Don't be a hack. This is not a Honda.

[RobertFontaine]

If you are under warranty you shouldn't be messing with your car the dealer will screw you.

The rest of your statement is sheer bogosity.

My bogometer reads 8.94 at this time.

[E92!Dreier]

If you are under warranty you shouldn't be messing with your car the dealer will screw you.

The rest of your statement is sheer bogosity.

My bogometer reads 8.94 at this time.

Where is this statement directed?

[casdm9901]

I doubt you will have a problem with Bav Auto. I never have.

[Rob Levinson]

Anyone who removes the CDV in its entirety is asking for trouble. The change in tension on the hydraulic lines can lead to premature wear and/or crimping.

Honestly, I have never heard of such a problem... and it must be thousands of people that have pulled the CDV. The lines are not under the sort of tension that a slight shortening will affect - in fact, there is additional slack in the line to accomodate drivetrain movement.

If you're hyper-concerned that your in-warranty car will be "in trouble" with the dealer because you took out this tiny part, then by all means use the unlock valve.

Details on the CDV:

http://www.uucmotorwerks.com/html_techtip/techtips/check_valve.htm

[Mad Machine]

I don't know.. this ranks up there with a whole host of modifications I will never do. I have never had a problem with how the clutch works on my car. I can still sidestep it and burn the rear tyres on demand (in first anyway) and the delay valve has never caused me to have a herky jerky shift.

And do not think I cannot shift.. I can work a manual transmission with or without the clutch.. upshifting AND downshifing.. I have several hundred thousand miles behind the wheel of a GMC box truck that had a six speed trans and two speed differential...

[UNDR R8D]

Anyone who removes the CDV in its entirety is asking for trouble. The change in tension on the hydraulic lines can lead to premature wear and/or crimping. Also the CDV "delete" from Bavauto is the exact same oem piece that was meant for your car, only it has had the delay valve removed. The only reason I have not swapped it in is because I cold-called 3 BMW dealerships (out of state, not my own) and said that I was thinking about bringing my car in for them to do this modification. Every single service advisor said this is the first thing they check when they do any service to the driveline. If they find any signs of modification, they notate it on the bill they present you (no warranty coverage). Don't be a hack. This is not a Honda.

Okay so you are saying put the part in?

I dont give a crap about warrenty, mine is up.

[UNDR R8D]

What cheap ass hack? remove the CDV. Both sides are correctly threaded. Reattach and problem solved. CDV is the hack.

Right. I feel sorry for your car.

[UNDR R8D]

Well, hell I am going to buy the part. Seems like it is worth it.

[Rob Levinson]

I don't know.. this ranks up there with a whole host of modifications I will never do. I have never had a problem with how the clutch works on my car. I can still sidestep it and burn the rear tyres on demand (in first anyway) and the delay valve has never caused me to have a herky jerky shift.

Your clutch feels good, right? Nice and responsive, good action, right? That's because your 318ti does not have the CDV. :D

CDV-equipped cars feel different, but feel better (like yours) with it removed.

- Rob

[FredK]

The rest of your statement is sheer bogosity.

My bogometer reads 8.94 at this time.
Funny, my bogometer read a little higher. I think it's because you're at a slightly higher altitude. :D

Tension? :confused

Essentially the CDV introduces hydraulic capacitance to the system and does not present any additional pressure to any component. If anything, it increases the pressure spike felt by the MC when you depress the clutch.

Hack? The hack is drilling out the CDV to the same diameter as the hydraulic line that feeds it and paying $30 for it. If you were really anal you'd replace the hardline with one that is 10mm longer. Otherwise you can just bend it to meet the clutch softline quite easily.

Please reserve "hack" for people who use a sock in a pinch to cover their oil fill hole.

[skipm2k]

:deadhorse:

[e30ncsu]

i was going to just remove it on my e36 but noticed that i had to pull the line pretty tight and was worried about kinking. thats the purpose of this part, to prevent any kinking in the line.

[Rob Levinson]

i was going to just remove it on my e36 but noticed that i had to pull the line pretty tight and was worried about kinking. thats the purpose of this part, to prevent any kinking in the line.

Not at all!

The purpose of this part is to act as a restrictor and slow the clutch slave cylinder fluid from moving in or out quickly, which in turn eliminates the possibilty of a fast shift.

It's so that any numb-foot newbie can walk into a BMW showroom and drive a manual transmission smoothly. Then they get home and realize the same part prevents them from driving it spiritedly.

The part is pure marketing luxury nonsense that sucks the soul out of modern BMWs.

- Rob

[The HACK]

Well, hell I am going to buy the part. Seems like it is worth it.

LOL. Your car may not even be equipped with it. :rolleyes

[Mad Machine]

Your clutch feels good, right? Nice and responsive, good action, right? That's because your 318ti does not have the CDV. :D

CDV-equipped cars feel different, but feel better (like yours) with it removed.

- Rob

+1 for having a TI then...

[Rob Levinson]

+1 for having a TI then...

The Compact was always a cool car, unappreciated when new.

- Rob

[e30ncsu]

Not at all!

The purpose of this part is to act as a restrictor and slow the clutch slave cylinder fluid from moving in or out quickly, which in turn eliminates the possibilty of a fast shift.

It's so that any numb-foot newbie can walk into a BMW showroom and drive a manual transmission smoothly. Then they get home and realize the same part prevents them from driving it spiritedly.

The part is pure marketing luxury nonsense that sucks the soul out of modern BMWs.

- Rob
um yes, the purpose of the bavauto part is exactly what i said

[Rob Levinson]

Ah, never mind. Your sentence's referential base was confusing... it reads like the original part's purpose is to take stress off the line.

[UNDR R8D]

LOL. Your car may not even be equipped with it. :rolleyes

Oh I am suppose to look before I run out and buy things?

Oh that's news to me...how foolish of me... :rolleyes