DIY Clutch Delay Valve (CDV) Removal

[tracer bullet]

Not actually true. I believe it's there for giving the driveline a bit of relief in extreme circumstances like side stepping the cutch. It's obviously there for a reason but isn't something that would affect normal drivers in normal clutch use on a road car. That's why one particular patent I read for a CDV system it was patented as a clutch "anti abuse" system.
Us engineers also like data, "relevant data" that is. Then backed up by a user "blind test"


Phil

I tend to agree, but please note in the same post you mention wanting data and a blind test, apparently to form an opinion, right after you state as fact that its presence doesn't affect normal drivers in normal circumstances which can only be taken to mean that none of us actually notices what we say we notice.

I applaud taking the null hypothesis until proven otherwise, but you have to at least see why everyone thinks you are certain it's a placebo and further that we're all idiots. Clearly you acknowledge it is there, and that it does something. Why can you not take the next step and at least consider that people might actually notice when it's removed?

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[lucky phil]

I tend to agree, but please note in the same post you mention wanting data and a blind test, right after you state as fact that its presence doesn't affect normal drivers in normal circumstances - which can only be taken to mean that none of us actually notices what we say we notice.

Not quite sure what you mean here but it's probably an interpretation thing. I said "I believe" which isn't the same as fact, but I believe the CDV is there for a reason and that reason is to protect the driveline to some degree from abuse such as "sidestepping" the clutch. In normal road car driving circumstances it has no material affect on clutch or shifting performance or clutch wear. This isn't to say it will have "zero" affect on the way the clutch feels to operate.
My car has a weighted shift knob and a shifter thats 1/4inch shorter than std. It's gives a different "feel" to the shift action but doesn't change the way it shifts or give any advantage to the shifting driving on the road. At the drag strip driven by a pro it may one way or the other but It's never going to happen so it's a moot point. Same here with the CDV but as per usual in "forum world" every mod done is a "game changer" and rationally questioning gets slammed. It's just the "forum world" echo chamber.

 

[Spart]

@Spart

If possible I'd like to see this in a Supra before and after CDV delete.

I did CDV pretty early on so I can't remember for sure, but IIRC even after the clutch pedal was completely unreleased and up, it felt like the clutch was still not completely engaged for a second.

Not in the cards unless someone wants to send me their car to get deleted.

 

[Spart]

Why can you not take the next step and at least consider that people might actually notice when it's removed?

Because the guy constantly conflates knowledge and understanding. Another hallmark of terrible engineering practice.

 

[BMWAF]

LMFAO. I’ve been driving around on the same Honda clutch for 18 YEARS with the CDV left untouched. Complete non-issue in a Honda. ?

 

[lucky phil]

I tend to agree, but please note in the same post you mention wanting data and a blind test, apparently to form an opinion, right after you state as fact that its presence doesn't affect normal drivers in normal circumstances which can only be taken to mean that none of us actually notices what we say we notice.

I applaud taking the null hypothesis until proven otherwise, but you have to at least see why everyone thinks you are certain it's a placebo and further that we're all idiots. Clearly you acknowledge it is there, and that it does something. Why can you not take the next step and at least consider that people might actually notice when it's removed?

Sorry I didn't see the second paragraph in this post before. The answer is I do believe the cluct "feel" will be different but what I don't buy is that it's gong to solve the now non existant clutch wear "issue" and m

LMFAO. I’ve been driving around on the same Honda clutch for 18 YEARS with the CDV left untouched. Complete non-issue in a Honda. ?

You know the best gearbox I've ever experienced in a car was a Honda. Back in the 70's I owned a Honda S600. Picture yourself in the drivers seat and your arm rested on the transmission tunnel at hip height and the 3 inch tall shifter was right at the perfect distance to fall into you palm in neutral. The shifter had a total of about 2.5 inches of travel for and aft and the selections were click, click, click precise. Funny little car. Central diff as normal but chain drive on each side to the wheels. Handled awesome for the day. Engine longevity was an issue though with that 600cc engine spinning at 3000rpm@60klm. It worked hard.
Phil

 

[tracer bullet]

The answer is I do believe the cluct "feel" will be different but what I don't buy is that it's gong to solve the now non existant clutch wear "issue"

FWIW not a single person here is doing it to prevent clutch wear issues. Only for the change to feel.

Glad it turns out, after all, you agree it will feel different.

The rev match and CDV have nothing to do with shift action. As long as the the clutch fully releases correctly then the shift action and syncro performance is totally independent of everything else. The rest is psychosomatic.

Didn't seem that way prior.

 

[lucky phil]

FWIW not a single person here is doing it to prevent clutch wear issues. Only for the change to feel.

Glad it turns out, after all, you agree it will feel different.



Didn't seem that way prior.

You need to go back to the start of the thread. People are linking the CDV to possible/probably clutch accelerated wear twice in the first 5 posts. I couldn't be bothered looking for more further on in the thread.
Phil

 

[Spart]

LMFAO. I’ve been driving around on the same Honda clutch for 18 YEARS with the CDV left untouched. Complete non-issue in a Honda. ?

Are you arguing that my data is wrong, or arguing that you're not sharp enough to feel the difference?

 

[johnsmither]

Hoping this could help anyone in the future. If you're having a dead pedal after removing CDV, make sure to fill the reservoir above max before trying to bleed it. The clutch pickup is way higher than the brakes and need above max level for it to even get back into the system. I was pumping a dead pedal for the longest time and couldn't figure out why.

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