DIY Clutch Delay Valve (CDV) Removal

[Turbro]

Another cdv deleted here! Less than 1 hour of work, and single handedly the best mod out the gate for the MT. Drives like a normal manual, no more jerky engagement in lower gears and unpredictability. Smooth as can be, and does what I want from my foot input.

10/10 fix. DELETE YOUR CDV ASAP

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[Canfilm]

CDV a success & what an amazing difference.

I have raced & drifted cars for years, along with most of my vehicles have been manuals over 35-40yrs of driving. I thought I was just struggling to find the sweet spot of engagement shifting, without success until CDV delete.

I went for a new slave cylinder. 30min job stretched out, as I got concerned about cross threading the bolts going back in, as they were tight. Double checked threads with tap, all good.

after clutch slave bleed. Test drive.

Clean & smooth shifts. Never looking back.

100% must do mod.

thanks for the thread & detailed description of install

 

[MisoSup]

I completed the CDV delete today. Amazing! The car just feels like every other manual I have ever driven. Not sure why I waited so long.

You can add one more thumbs up for this mod. Super easy and worth it.

 

[spaghettihoes]

Finally came around to doing this and can echo what everyone's been saying. It made a much bigger difference than I expected.

The last manual cars I owned were a 240sx and an Evo 8 which are much older so I figured the clutch feel was a new car thing but after removing the CDV it really does feel like those older cars did. The clutch bite is much more direct/quicker/stronger and I don't have to wait for the revs on the 1st to 2nd shift like I did before. Highly advised to do this mod.

One thing to note is that the CDV is tiny, way smaller than the pictures make it look. The screw needed to pull it out was much smaller than I expected.

 

[94boosted]

Why didn't I do this sooner, I ask my myself.

I've been driving, tracking and autocrossing manual transmission cars for 20 years and the way the Supra clutch behaved with the CDV made getting going from a stop and the 1->2 shift so awkward I felt like I had learned to drive MT just the day prior ?. Without this stupid CDV, it just feels so much smoother and more natural.

Now to go and do this on my MK8 Golf R MT daily as well

 

[Pizza]

Coming in to report. Deleted my CDV last week, then went to a track weekend.

It is better, at first I wasn't convinced because I never really minded the CDV, but it definitely makes the shifting experience more "normal"

 

[AHP]

I did this last week as well - the writeup was much appreciated! This is the first car I've owned that has a shared fluid reservoir for both clutch and brakes. Threw me for a loop for a minute. Pro-Tip: Don't let the fluid level drop below "Min" otherwise you'll suck air and you'll have to rebleed again.. ?


I wouldn't call the difference very dramatic. It's most noticeable on the 1-2 shift. Definitely worth the time and effort, though. I only had 700 miles on the car at the time so I didn't suffer with the CDV too long.

 

[RyanA90]

I did this last week as well - the writeup was much appreciated! This is the first car I've owned that has a shared fluid reservoir for both clutch and brakes. Threw me for a loop for a minute. Pro-Tip: Don't let the fluid level drop below "Min" otherwise you'll suck air and you'll have to rebleed again.. ?


I wouldn't call the difference very dramatic. It's most noticeable on the 1-2 shift. Definitely worth the time and effort, though. I only had 700 miles on the car at the time so I didn't suffer with the CDV too long.

DId you change your brake fluid out or just top it off?

 

[maniac]

For my fellow Australian: Phil.

 

[lucky phil]

For my fellow Australian: Phil.

Yes I've read this sort of opinion more than once, same as I've read about ecoboost blocks cracking because head gaskets fail and many other "opinions" on many other mechanical things. But no one has accepted my challenge yet which will prove if the CDV actually slows the release of the clutch and causes, lets call it micro slipping. Put the car in first gear and rev the engine to say 1500 rpm and side step the clutch. This is the fastest the clutch can possibly engage. If the CDV is slowing the clutch action to any extent worth mentioning the car should not stall and simply pull away. Maybe a little abruptly but it shouldn't stall. Internet "theories" are one thing but nothing beats actual proof and the clutch feeling "different" without the CDV doesn't necessarily mean it actually makes a genuine "improvement" in any area. There are plenty of mods you can do that change the "feel" but offer no tangible measurable improvements. No one has accepted the side step challenge yet for some reason.

Phil

 

[Turbro]

Meh, this mkv drove like shit with the cdv. I hated the shifting engagement points being super inconsistent and jerky. It’s 100% the cdv crap

I’ve owned 15 other manual cars without a cdv, never had clutch issues factory or aftermarket. It’s a useless piece that needs to go. I removed my cdv and the car is so much better to drive just like my previous cars and I’ll never go back. The cdv sucks ass and is imo designed for shitty or newbie manual drivers. Or I guess for shitty dealers when servicing the vehicle so they don’t completely burn your clutch.

Useless piece, remove it and enjoy your car more

 

[lucky phil]

Meh, this mkv drove like shit with the cdv. I hated the shifting engagement points being super inconsistent and jerky. It’s 100% the cdv crap

I’ve owned 15 other manual cars without a cdv, never had clutch issues factory or aftermarket. It’s a useless piece that needs to go. I removed my cdv and the car is so much better to drive just like my previous cars and I’ll never go back. The cdv sucks ass and is imo designed for shitty or newbie manual drivers. Or I guess for shitty dealers when servicing the vehicle so they don’t completely burn your clutch.

Useless piece, remove it and enjoy your car more

You might not be aware but the majority of cars sold in the world are manual transmissions. Here in Italy I'd estimate 80% of all ICE vehicles are manuals. Doesn't even need to be small cars either but delivery vans etc as well. It's only places like the US, Australia and maybe a few others that think an auto is the std transmission. So on a world scale there's far more people around that are experts at using a clutch and manual shifting that you probably think.
Currently driving this thing around, a new Peugeot 408 petrol hybrid and yes it's an auto. Does about a gazillion MPG and is as exiting as a washing machine but like a good washing machine it does it's thing adequately. Has some nice features like a simple small lever for Fwd, neutral, reverse and a push button for park. If you push the engine stop button when you park it puts it in park and applies the handbrake automatically for you which is convenient.

 

[maniac]

Yes I've read this sort of opinion more than once, same as I've read about ecoboost blocks cracking because head gaskets fail and many other "opinions" on many other mechanical things. But no one has accepted my challenge yet which will prove if the CDV actually slows the release of the clutch and causes, lets call it micro slipping. Put the car in first gear and rev the engine to say 1500 rpm and side step the clutch. This is the fastest the clutch can possibly engage. If the CDV is slowing the clutch action to any extent worth mentioning the car should not stall and simply pull away. Maybe a little abruptly but it shouldn't stall. Internet "theories" are one thing but nothing beats actual proof and the clutch feeling "different" without the CDV doesn't necessarily mean it actually makes a genuine "improvement" in any area. There are plenty of mods you can do that change the "feel" but offer no tangible measurable improvements. No one has accepted the side step challenge yet for some reason.

Phil

Sure, ill give it a go.

An abrupt side step isn't the improvement, its more about the feel of engagement being a little bit more discernable.....but for the everyman.....the only reason they all feel a better 1- 2 engagement is because they are probably a little quick on the release during the shift. It makes bugger all difference any where but the track IMO.

( i didn't have a mk3, had a mark 2 FOCus Rs built by Mostech Race engines. ( BEN btw) hi! I used to miss it until i bought this Supra!

 

[Hasan]

I had 2 issues with the CDV.

1) There was no feedback in the clutch pedal. It was more like the accelerator pedal. I could not tell when and what the clutch was doing.

2) Sometimes there was a considerable delay in clutch disengagement and engagement, especially when I tried to shift quickly. For example, I would shift from 3rd to 4th and step on the gas and there was no clutch. The engine would rev up and then the car would lurch forward when the clutch finally caught up.

 

[Spart]

Stop engaging the troll. He's been dead on this hill for like a year now. The corpse has rotted and the bones are sun bleached. There's nothing left to his argument.

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