CDV (clutch delay valve delete) question

[kwakkwak17]

Hi
I'm planning on deleting the CDV and installing sirimoto ss clutch lines.
Is there anyone out there with a CDV delete (long term). I read that there might be issues on the transmission, clutch/flywheel etc.
I dont drive my si hard at all. just the occasional spirited road driving like going fast on on/off ramps with some okish heel toeing.

Thanks!

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[amirza786]

There are those that have done it that will argue that it makes shifting better which may well be, but you should know that its purpose is to protect from introducing shock to the drive train components. Engaging the drive train too quickly can damage the drive train, transmission, differentials etc. So if you do it, you are doing it with that inherent risk in mind.

Just know, it wasn't installed by Honda just so they can be a-holes and make driving or shifting more difficult

 

[PowerPerLiter]

In my opinion dont open that can of worms until you need a clutch replacement and even then I would advise against it. It is no bueno when using the stock dual mass flywheel. Many are getting away with it but long term it hurts flywheel and main shaft carrier bearings in the trans.

The better question is why? I am assuming you dont have any issues and you are just trying to "improve" something?

 

[amirza786]

In my opinion dont open that can of worms until you need a clutch replacement and even then I would advise against it. It is no bueno when using the stock dual mass flywheel. Many are getting away with it but long term it hurts flywheel and main shaft carrier bearings in the trans.

The better question is why? I am assuming you dont have any issues and you are just trying to "improve" something?

^ What @PowerPerLiter said ^

 

[kwakkwak17]

In my opinion dont open that can of worms until you need a clutch replacement and even then I would advise against it. It is no bueno when using the stock dual mass flywheel. Many are getting away with it but long term it hurts flywheel and main shaft carrier bearings in the trans.

The better question is why? I am assuming you dont have any issues and you are just trying to "improve" something?

Yes I plan on turning this car into a track car once I graduate school. Planning on doing Exedy clutch and flywheel, lightweight rims tires, and suspension. But for now it is mainly to improve shifting feel. I have the hondata tune on it now and it has improved the rev hand but I heard that shifting feeling is improved more by removing the CDV.
So you think I should just do the SS clutch lines for now?

 

[amirza786]

Yes I plan on turning this car into a track car once I graduate school. Planning on doing Exedy clutch and flywheel, lightweight rims tires, and suspension. But for now it is mainly to improve shifting feel. I have the hondata tune on it now and it has improved the rev hand but I heard that shifting feeling is improved more by removing the CDV.
So you think I should just do the SS clutch lines for now?

If you want to improve shifting, get the full Acuity short shifting kit. You would be spending roughly $450 or so, you will actually get good shifting without possibly damaging your drive train

 

[PowerPerLiter]

Yes I plan on turning this car into a track car once I graduate school. Planning on doing Exedy clutch and flywheel, lightweight rims tires, and suspension. But for now it is mainly to improve shifting feel. I have the hondata tune on it now and it has improved the rev hand but I heard that shifting feeling is improved more by removing the CDV.
So you think I should just do the SS clutch lines for now?

I had entertained the ss clutch line but went away from that. If you were to end up having trans issues that you may want covered under warranty that would be the first and obvious thing that they would deny it for. "improper install.....not bled correctly causing clutch/trans damage....warranty denied"

Honestly I would focus efforts elsewhere entirely. But that is just my opinion. Especially if your in school.

 

[amirza786]

I would actually wait a few years when the car is out of warranty to turn it into a track car, for the reasons stated in the above post

 

[kwakkwak17]

OK thank you for the input guys!

 

[NoKz]

I have had the CDV removed for a year now. I'll give you my details....

Clutch: Spec Inc. Stage 3
Flywheel: Single-Mass Steel
CMC: Willwood Upgraded CMC
Clutch Line: PRL Stainless-Steel

Now, first things first...the vehicle this was done to is my daily driver. I do a round trip of about 64 miles to and from work, with moderate traffic. Now, not discussing clutch engagement, pressure, etc. and only discussing the CDV, I can without a doubt say the shifting is better when under load. Prior to removing the CDV, there were times were I shifted too fast and the CDV caused me to grind a gear. Since removing the CDV, I have not had that issue at all.

However, shifts if not synced properly do shock the transmission and vehicle. I can totally see how this would effect things negatively in the long run. The most noticeable of this "shock" can be felt when no-lift-shifting under full load. I do not recommend it unless you're taking someone to GappleBees™. Driving normally, if you don't rev match properly by timing your clutch release after a shift, you may feel a shock. It is NOT for the average person. For most people, it will become a pain to drive. For me, I've gotten used to it.

EDIT: I just noticed that you plan on tracking the vehicle. If that's the case, remove it. It definitely helps on the track. As for the streets, it's not exactly "smooth".

 

[kwakkwak17]

I have had the CDV removed for a year now. I'll give you my details....

Clutch: Spec Inc. Stage 3
Flywheel: Single-Mass Steel
CMC: Willwood Upgraded CMC
Clutch Line: PRL Stainless-Steel

Now, first things first...the vehicle this was done to is my daily driver. I do a round trip of about 64 miles to and from work, with moderate traffic. Now, not discussing clutch engagement, pressure, etc. and only discussing the CDV, I can without a doubt say the shifting is better when under load. Prior to removing the CDV, there were times were I shifted too fast and the CDV caused me to grind a gear. Since removing the CDV, I have not had that issue at all.

However, shifts if not synced properly do shock the transmission and vehicle. I can totally see how this would effect things negatively in the long run. The most noticeable of this "shock" can be felt when no-lift-shifting under full load. I do not recommend it unless you're taking someone to GappleBees™. Driving normally, if you don't rev match properly by timing your clutch release after a shift, you may feel a shock. It is NOT for the average person. For most people, it will become a pain to drive. For me, I've gotten used to it.

EDIT: I just noticed that you plan on tracking the vehicle. If that's the case, remove it. It definitely helps on the track. As for the streets, it's not exactly "smooth".

Thank you for the input! its much appreciated. I think ill stay away from this until I replace the clutch and flywheel

what are your thoughts on the ss clutch line?

 

[amirza786]

I have had the CDV removed for a year now. I'll give you my details....

Clutch: Spec Inc. Stage 3
Flywheel: Single-Mass Steel
CMC: Willwood Upgraded CMC
Clutch Line: PRL Stainless-Steel

Now, first things first...the vehicle this was done to is my daily driver. I do a round trip of about 64 miles to and from work, with moderate traffic. Now, not discussing clutch engagement, pressure, etc. and only discussing the CDV, I can without a doubt say the shifting is better when under load. Prior to removing the CDV, there were times were I shifted too fast and the CDV caused me to grind a gear. Since removing the CDV, I have not had that issue at all.

However, shifts if not synced properly do shock the transmission and vehicle. I can totally see how this would effect things negatively in the long run. The most noticeable of this "shock" can be felt when no-lift-shifting under full load. I do not recommend it unless you're taking someone to GappleBees™. Driving normally, if you don't rev match properly by timing your clutch release after a shift, you may feel a shock. It is NOT for the average person. For most people, it will become a pain to drive. For me, I've gotten used to it.

EDIT: I just noticed that you plan on tracking the vehicle. If that's the case, remove it. It definitely helps on the track. As for the streets, it's not exactly "smooth".

You should share some video of your track time with us!

 

[kwakkwak17]

You should share some video of your track time with us!

Yes I'm very interest as well

 

[NoKz]

You should share some video of your track time with us!

Yes I'm very interest as well

Ask and ye shall receive. Here's my 1:47 at Big Willow on Stock Summer Tires.

 

[kwakkwak17]

Ask and ye shall receive. Here's my 1:47 at Big Willow on Stock Summer Tires.

Amazing! thank you for that

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