Nissan 370Z Forum - Upgraded Clutch Slave Cylinder Fails Again!

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- - Upgraded Clutch Slave Cylinder Fails Again! (http://www.the370z.com/engine-drivetrain/107219-upgraded-clutch-slave-cylinder-fails-again.html)

Quote:

Originally Posted by alexd0316 (Post 3304365)

This happened to me yesterday at 46,000 miles. Thinking about the Z1 Clutch Concentric Slave Cylinder Elimination Kit from Z1motorsports. Any suggestion?

For track application I would do this upgrade. https://www.z1motorsports.com/z1-pro...it-p-7340.html

If the z1 CSC fails it's a matter of getting underneath the car, replacing the pull-type cylinder instead of dropping the trans. The hardest part would be bleeding the fluid with another buddy.

Stock cats get super hot because they're doing their job but that heat needs to go somewhere and incidentally your clutch lines are near there. Once that fluid boils and bubbles are formed, that's it the system isn't doing it's job

I got one, and yessss get one, i also have the rjm pedal, also i recommend replacing ur master cylinder. Its a sweet setup adjustibility is awsome.

I waraped my exhaust so np. Also it comes with a heat shield.

Quote:

Originally Posted by 2011 Nismo#91 (Post 3303791)

Wasn't there some issue with the HD CSC and some brand of aftermarket clutch? Anyway boiling would temporally make the clutch stick, after it cooled down it should work normal again. And if he hasn't replaced the stock cats then the heat shield on them should prevent any overheating of clutch fluid.

Yes. A Spec. Something like 85-90% of ZSpeeds CSC failures have been when installed with a Spec clutch. Asninjnderstand it Joe no longer warranties the CSC is the clutch is a Spec.

My question is if I don't run track is it necessary to spend $445 for Z1 CSC compare to OEM CSC $100 plus? Please give me a suggestion before hitting this submit order button. lol

Quote:

Originally Posted by alexd0316 (Post 3305270)

My question is if I don't run track is it necessary to spend $445 for Z1 CSC compare to OEM CSC $100 plus? Please give me a suggestion before hitting this submit order button. lol

Never buy a replacement OEM CSC it'll just fail again. The only options are either the HD CSC from ZSpeed or the Elimination Lit from Z1.

Quote:

Originally Posted by jwick (Post 3305274)

Never buy a replacement OEM CSC it'll just fail again. The only options are either the HD CSC from ZSpeed or the Elimination Lit from Z1.

Just ordered the Z1 CSC right after your comment my brother. Thanks for the feedback. How much should I expect the labor cost be? Thanks again

I'm going to guess between 3-5 hrs of labor. Never installed Z1 elimination kit so I can't say for sure.

For OEM CSC, it is good practice to flush that fluid every so often, definitely if you drive hard. There's no escaping the heat and when the stock fluid boils; thats it, the fluid will bypass the seals that are meant to keep it in. I have my stock csc, spirited driving... replaced with higher temp brake fluid every other oil change myself.

So what was the actual diagnosis? It would be good to actually get a report on what happened, so that the thread is actually useful instead of the countless OMGWTF stuff that goes dead after some speculation and no diagnosis or fix action.........I'm just saying...

Quote:

Originally Posted by TechnicZ (Post 3306715)

^This

Every 2 - 3 weeks myself

Update: HD CSC DID NOT FAIL. See my new post #30 below.

Quote:

Originally Posted by roplusbee (Post 3306833)

Ya, me too, but the car doesn't go to the shop until the 16th. I will know then and I will report back. I was unable to bleed the system and get any pedal back so that's why I fear something bad has happened.

Did you check the master first? I've been through three of them in 70K miles now. One at 30K miles, another at 51K miles (at which point I got rid of the OEM CSC), and another at 68K miles.

FWIW, I have the Z1 CSC Elimination Kit. My cylinder failed about a year after the install. I paid Z1 $60 to send me a new one, spent 20 min uninstalling the old one and adjusting and installing the new one, and then sent the old one back for a refund. It was easier than replacing the damn master cylinder.

:drama:

I'm interested in what went wrong. The CSC is the worst part of owning a Z.

I just want you to know that I am not trying to be an jerk or anything. I genuinely just want to know how this pans out so that it can help me and others in the community to avoid (and prevent) this issue.

Good luck!

Clutch Fails Again: NOT a CSC Failure

Quote:

Originally Posted by pbs370z (Post 3303376)

Back in July my clutch (CSC) orig. Nissan slave cylinder failed so I upgraded to the new and improved HD CSC (with new MC and stainless steel line upgrade) from Zspeed (ZSpeed Performance Replacment HD Clutch CSC Heavy Duty Slave Cylinder Kit) (along with a new Clutch & Flywheel) which has been touted here on this forum and on the Zspeed website to fix the infamous CSC failure problem in the 370Z.

Guess what? After 10hrs and about 500 miles of driving the upgraded CSC failed. That's right - pedal to the floor again! This happened after 2 sessions at the track (open lapping days) of about 30 minutes total (15 min. max sessions) each day, and then the last track day of 4 laps (10 minutes) which was a nice cool 75 deg. day. I came in to the pits after 4 laps, sat about 5 minutes and then went back out for 1 more lap when the CSC failed. I'm thinking heat caused the seals to fail.

Update (9/18/2015): CSC did not fail.

Right now I'm wondering if this new CSC (Zspeed Item #: zsp2006) is really any better than the stock Nissan unit.

Is this really a proven fix, or am I just really unlucky?

At $800 (labor) a pop for trans. R&R and MC/CSC replacement plus $325 for parts, I don't think I'll be putting another one of these CSCs in my vehicle.

Any comments on this Zspeed CSC setup are welcome.

Also: To be fair, the CSC has not been removed yet to confirm its bad, but I believe it is since the MC makes good pressure. I'll report back here to confirm my suspicions.

OK, the moment we've all been waiting for! My clutch problem was NOT the Zspeed HD CSC (clutch slave cyl.) this time. It was the clutch itself.

Specifically (shop initial inspection): Clutch disc welded to pressure plate (fingers collapsed). The CSC was still operating, but the clutch - she no release.

My clutch: South Bend DXD Clutch Stage 2 Daily Clutch Kit
South Bend DXD Clutch Steel 19lb Flywheel

Came with this Zspeed Kit:
"South Bend Complete Clutch Package Stage 2 Daily 370 G37 G35 Q60"
ZSpeed Performance Nissan Infinti OEM & Performance Parts

Bottom line, this clutch did not hold up with my occasional, limited track use.
I don't ride or slip the clutch excessively, so I was very surprised to find out this happened.

Why do I always have to learn the hard way!?:shakes head: