I just put a new slave in my car yesterday for similar reasons. I have done I couple of 5000+ rpm pulls in various gears and so far all appears to be working. I wanted to run it hard today, but we have snow here so I probably won’t take the S4 out.
weird because this appears to be happening only to supercharged guys.
Axel, Speed, GolfTeam : What stage clutch are you guys all rocking?
I have the JHM Stage 3 kit.
Speed, you did this b/c you were actually having a problem, or just as a precautionary?
Headers make it a BITCH to do transmission work. I took it to one shop for them to bleed the slave, they took one look at the headers and said it can’t be accessed. Luckily I did a good job myself, I just wanted them to double check it.
Saki, I’m Stg4 with LWFW. And this is the first time I’ve ever noticed it happening. I’ve been making pretty solid shifts on it for a while no problem.
I was having an issue with the pedal not coming back up under hard runs. It is fine under normal/spirited driving. It literally just started this week.
Interesting it’s just with us S/C guys. Clutch/FW was one area I thought I was set for good. Wondering if what horsepower is talking about has anything to do with it.
Also interesting we’re only seeing it in 3-4 shift, maybe combination of less RPM drop which means higher power level at engagement as well as probably the fastest shift?
Is it as simple as the auto adjuster getting pushed all the way out? B/c if so, I’m fine with that lol. Better than a trans pull. My last clutch was like that anyways after the abuse with the beta LA and the couple times I used LA on accident with esp still on.
could be that they are revving faster than the N/A cars
faster than 91gl, jaybquick and the various nitrous cars?
The nitrous cars was one of the first thing that came to mind. But I don’t know how the spray controller is cutting on/off during shifts.
91gl if anyone should be the one to see problems, and then Jay of course. It’ll be interested to see what info surfaces.
Wouldn’t it be more the stage 4 clutch being harder on the slave cylinder (which is 6 years old)? I’m not very mechanically inclined so I may be way off.
Quick update - the new slave didn’t fix the problem. The clutch pedal still stays down for a bit after WOT pulls in 1st, 2nd and 3rd (it will eventually pop back up if left alone). To note, I can still shift the car, but the engagement is instant. Once the pedal is pulled up, it works fine. Also, I can gradually accelerate in 1st and 2nd to red line and I do not have the issue. It only happens when I am WOT above 5000 rpms in the lower gears.
Interesting. So a new slave DOESN’T fix it eh? Yeah, my problem is identical (although it also happened to me in 4th gear).
Hmmm…any knowledgeable folks here have an idea?
I will be studying the hydraulic setup tonight. Next step is the master cylinder, but the behavior is making me think it isn’t that.
Maybe contact JHM and see if they’ve ran into this problem before. They’ve been beating the piss out of their s/c car for a while now. More HP = More problems … and a lot more fun 8)
Did you replace the OEM rubber return line with the braided one? That usually has more to with the clutch pedal rate of return than the slave cylinder assuming the slave is funcitoning properly. I purchased both thinking if I was going to take the time to do the hose replacement I might as well replace the slave while i’m there.
Axel/Speed. If what Horsepower is saying has any correlation, it makes perfect sense (from my understanding) that the slave/hydraulic system isn’t the culprit.
I’m thinking it’s the self adjustment spring that is the problem. After it occurred to me once, I realized my engagement point was a bit higher than before once everything was “back to normal”. Not drastically different, but enough when at stop lights etc, my habitual pattern of moving from a stop has resulted in the clutch engagement point being higher than before as I’ll have too much gas in for the point that the clutch is at.
^This same thing happened to me after 1-2 launches with ESP on accidentally (not the pedal being stuck down, but the change in engagement point for the clutch). When we pulled my clutch, the clutch adjuster spring was as far back as it could go, even though there was a decent bit of life left on the clutch. But I had 80k on the oem one, so it wasn’t too shocking for the spring to be back all the way.
Like mentioned, my slave is only 15k old, so I doubt it failed that fast as it is the updated model and my brake fluid is relatively new and right on the max line.
I have to ask, Speed and Maddog, did this start in the last 2 weeks for you guys? If it did, that’s damn eerie…
^haha, I know right. Yes, it literally happened the night I posted in reply to this thread. Karma probably had a role in it, cause I was thinking, “damn axel, that sucks for you.”
I haven’t really tested it again since that one night, b/c I didn’t want to push anything as I doubt it’s a one time fluke. 1-2 still seems fine, but it was just the 3-4 that did it (and I never got higher than that obviously).
New hose as well, but I just picked a new stock one.
lol - Yeah, it started for me on Monday. I did a quick run through the gears and that was the first time it did it.
Ok, that’s fucked up. It all happened to us within a 24 hour period!!! Have the planets aligned as well?