Clutch Delay Valve?

[Dave-ROR]

Originally Posted by Porsche

Am I mistaken, then, in thinking that a CDV only affects RELEASING the clutch pedal, the clutch engagement?

What you're saying here suggests that the CDV affects the clutch DISengagement as well, so that a fast shift might "beat" the clutch disengagement, which of course would result in gears grinding.

If so, I don't like the sound of that.

Not sure honestly. I've never looked into these systems as I've never really been affected by them.

[Porsche]

Originally Posted by Dave-ROR

Not sure honestly. I've never looked into these systems as I've never really been affected by them.

Yeah, me either. Thanks, though.

[BRZfan]

Her ya go. These are the rage in the Simi Valley. They are comfortable, really, really, quiet and project an atmosphere of aggressive and dominating behavior, i.e., (alpha male).

Originally Posted by SirBrass

I'm looking for a good pair of shoes that will look good in the workplace, where normal professional dress is a neat button down untucked short sleeve w/ jeans or dockers.

My loafers are good for that, but a little too loose in the heel for driving with all the time (the back of my ankle on my left foot gets majorly tender).

I also have narrow feet, so I need something that fits, but isn't so foot - conforming that the sole is too narrow (even with the cusco accelerator pedal, my jazz sneakers are too narrow for secure heel-toe purchase).

I'll look at the drift cat 5's. I just need to find a store around here that has them so I can try them on & see if my normal size (8.5 or 9) is appropriate.

Sent from my SCH-I535 using Tapatalk

[wheelhaus]

wow thread derailed...

I feel like there is a CDV for engagement, because trying to double clutch quickly still has a notable "bump" in the shift as the synchros mate. I've tried many different timings and only If I DC slowly, the shifter nearly falls into place as it should. This makes me believe the clutch doesn't engage quickly enough between two quick stabs of the pedal.

I had an 06 Evo MR that had a CDV, but it was pretty simple to remove. The Evolutionm.net guys called it the clutch pill, and it was a little restrictor piece in the slave cylinder behind the hose threads. Remove the hose, extract restrictor pill, reinstall hose and bleed clutch.

IT'd be nice if someone was willing to tear down their 86 clutch master and slave to see just wtf is going on in there.

[Poodles]

Well, the exploded diagram I see of the master doesn't show anything that could be it, but the body of the master is oddly shaped (and the exploded diagram doesn't cover removal of the snap ring on the bottom and what's behind it). Given it's odd shape, it could very well be in there.


The slave looks conventional.

[continuecrushing]

Bump for this, because I HATE our clutch

[daiheadjai]

I don't find the clutch release bothers me in terms of feel, but does anyone else get this noticeable "zzzt" sound when releasing quickly?

[CIAGDDS]

Originally Posted by ashtray

Does the manual BRZ have a Clutch Delay Valve, or CDD?

been driving manual for 20 years, always rev-match my up and down shifts

Why are you rev-matching while shifting up? You don't need to do that and sounds like it is the issue.

[SirBrass]

Unless you let your for lag on the clutch when upshifting, there's no need to blip on the upshift (that is, lag so long your revs drop below what they'd normally drop to on the upshift).

On phone I am. Therefore, if mistakes I make, Frank Oz blame you should.

[extrashaky]

Originally Posted by Poodles

Well, the exploded diagram I see of the master doesn't show anything that could be it, but the body of the master is oddly shaped (and the exploded diagram doesn't cover removal of the snap ring on the bottom and what's behind it). Given it's odd shape, it could very well be in there.


The slave looks conventional.

So everyone can see what you're talking about, here's the exploded view of the master cylinder:



By "oddly shaped," I'm assuming you're talking about the round bit below the cylinder where the diagram says "Clutch master cylinder body." That does look pretty suspicious.



Here's the slave cylinder:



And how it fits in the bigger scheme of things:



Looking at how other CDVs are installed, if there were one in there, my money would be on it being attached to the top end of that flexible hose to the slave cylinder. I don't think we have one.

[BradBot]

Any confirmation that there is actually a clutch delay valve on our cars? I happened to come across this thread; it sounds like this spring could be the cause of odd feeling of our clutch engagement: http://www.ft86club.com/forums/showt...t=35621&page=2

[ashtray]

Originally Posted by CIAGDDS

Why are you rev-matching while shifting up? You don't need to do that and sounds like it is the issue.

Think cold mornings before the car is warmed up. You're (hopefully) not slamming the shifter from 1-2-3 etc. If you're shifting at lower rpms (again, before the engine fluids are all warmed up), there is fewer rpms differences between gears (35mph in 3rd vs 4th for example). It's very easy to have the rpms falls below that if the next gear.

That said, in more spirited driving I adjust throttle input at the start of the shift and not at the end like when you downshift and rev match. It's just being a little more lazy sometimes with removing the right foot from the gas as you're hitting the clutch pedal. I don't raise the rpms, I just don't let them fall as fast. Just gives you smoother shifts, no driveline jerk, and earlier application of the throttle in the next gear without doing any clutch feathering.

[extrashaky]

Originally Posted by BradBot

Any confirmation that there is actually a clutch delay valve on our cars? I happened to come across this thread; it sounds like this spring could be the cause of odd feeling of our clutch engagement: http://www.ft86club.com/forums/showt...t=35621&page=2

I do not see any mention of a CDV in the service manual. If we had one, I would expect to see it in that exploded diagram on the previous page, and I would expect it to be connected to the top of the pressure hose between the master and slave cylinders. Unless it's built into that hose or into the master cylinder itself, I really don't think we have one.

That clutch spring sounds like a more likely explanation for the behavior of this clutch. I'm up to 7500 miles on mine, and to me the clutch seems to have gotten better. I don't know if that's because that spring has had a chance to break in or because I have gotten used to driving with such a soft clutch. Personally I can live with it like it is.

[BradBot]

Originally Posted by extrashaky

I do not see any mention of a CDV in the service manual. If we had one, I would expect to see it in that exploded diagram on the previous page, and I would expect it to be connected to the top of the pressure hose between the master and slave cylinders. Unless it's built into that hose or into the master cylinder itself, I really don't think we have one.

That clutch spring sounds like a more likely explanation for the behavior of this clutch. I'm up to 7500 miles on mine, and to me the clutch seems to have gotten better. I don't know if that's because that spring has had a chance to break in or because I have gotten used to driving with such a soft clutch. Personally I can live with it like it is.

I'm 11k in and the spring still drives me nuts. I just can't get the feel down, and I feel like I'm learning how to drive manual for the first time. It's very frustrating.