JWT clutch is just too damn good... unfortunately...

KillerBee370 · 07-13-2010, 09:58 AM

Quote:

Originally Posted by Zat_Zuma

I'm confused

Did the clutch master cylinder blow out or did the Concentric Secondary Cylinder (CSC) go?

For clarification the CSC is located on the transmission shaft and releases the clutch from the pressure plate. The clutch master cylinder supplies hydraulic pressure to move the CSC.

I won't comment until I figure out which part failed.

I do have some updates from Southbend on their product development.

That is a good question. I will find out today from the tech exactaly what happened and update the post.

vividracing · 07-13-2010, 01:41 PM

I am sorry that the cylinder failed. I called you maybe last week. Unfortunately I have found out that as of the moment there is no aftermarket available (according to Stillen and JWT). BUT after I have informed Stillen and JWT they are doing some research into this. Both companies really can't believe that this has happened to a 370z. I will keep trying to look for a solution for you hopefully something will pop up. I have a lead from the great guys at Stillen telling me that the "jdm" cylinder they have heard might be better. I am trying to locate and get one for you. I hope everything works out and I will keep you updated to my findings.

Thanks,
Phil

m4a1mustang · 07-13-2010, 02:08 PM

IIRC a member from Australia had his master cylinder fail with the stock clutch... wonder if the clutch is really the culprit of the failure or if it was just a defective unit in your car, KB?

DIGItonium · 07-13-2010, 02:13 PM

I don't think it's the clutch, but I've heard the slave cylinder is the weakest link. Nissan issued a recall with the '07 Z with some users reporting sudden loss of clutch pedal pressure causing it to sink to the floor. At least one owner got in a bad accident because of the pedal sinking to the floor.

Recall on slave cylinder - MY350Z.COM Forums

I'm surprised this issue exists with the 370Z.

Zat_Zuma · 07-13-2010, 03:15 PM

I'm not surprised the stock CSC is a piece of junk and will not handle the pressures of a heavier pressure plate.

Read this: CuztomPartZ HR CSC Concentric Slave Cylinder Upgrade and INFO - MY350Z.COM Forums

RCZ · 07-13-2010, 03:57 PM

I was warned about this a few weeks after I installed my new clutch. I've been talking to ZSP because they are engineering a full metal CSC replacement, not sure what the status on that is. Unfortunately, my clutch is a ticking time bomb right now. Fortunately, my Southbend clutch is a lot less stiff than the JWT so it should help lengthen the life of my CSC. Hopefully I get lucky and it doesnt happen for a good while, but I'm going to get AAA in the meantime.

KillerBee370 · 07-13-2010, 04:47 PM

The technitian that is responsible for my car is out today so I couldn't get an answer as to weather it was definitively the Clutch Master Cylinder or the Concentric Secondary Cylinder. I too would like to clear this up.

I will try to get my hands on the failed part/s in question so that I can take some pics and possibly get these item/s into the hands of JWT and or Stillen etc. so that some R&D can happen.

KillerBee370 · 07-13-2010, 04:51 PM

Quote:

Originally Posted by m4a1mustang

IIRC a member from Australia had his master cylinder fail with the stock clutch... wonder if the clutch is really the culprit of the failure or if it was just a defective unit in your car, KB?

Anything is possible. I suppose it could be a faulty unit but my suspicion would be that the pressure plate is just to much for the stock cylinder and or the consentric unit.

Quote:

Originally Posted by DIGItonium

I don't think it's the clutch, but I've heard the slave cylinder is the weakest link. Nissan issued a recall with the '07 Z with some users reporting sudden loss of clutch pedal pressure causing it to sink to the floor. At least one owner got in a bad accident because of the pedal sinking to the floor.

Recall on slave cylinder - MY350Z.COM Forums

I'm surprised this issue exists with the 370Z.

To be clear, I never experienced any loss of pressure prior to the fluid dumping and my clutch pedal heading south never to return. Everything was in fine operating order until this happened.

ste01 · 07-13-2010, 06:07 PM

I had the same problem 2 weeks back while driving the Alpenstrasse in Germany, driving along, go to change down and clutch pedal goes straight to the floor no pressure what so ever, the following morning clutch pressure was back checked fluid level all was ok.
Got the Z to the dealership after convincing them there was a problem it took them 3 days to get approval and parts from Nissan. They replaced the slave cylinder, CSC (in the old days would be the release bearing) and the steel hydraulic pipe to the CSC.
Had a look at the parts when collecting the Z and it was the CSC that had gone and this was with only 4550 miles on the clock

ste01 · 07-13-2010, 06:10 PM

forgot to say stock clutch assy

wishihadnav · 07-13-2010, 10:50 PM

Damn I want a clutch upgrade but this is making me a little hesitant.

m4a1mustang · 07-13-2010, 10:52 PM

Quote:

Originally Posted by wishihadnav

Damn I want a clutch upgrade but this is making me a little hesitant.

Likewise. I will have to wait it out until there is a resolution.

1slow370 · 07-14-2010, 05:30 AM

CONCENTRIC SLAVE CYLINDER master-slave i know i'm a finicky a$$ about this stuff

Also lots of cars now a days use the concentric slave cylinder/combined throwout bearing setup, it isn't new it's just failed engineering thank the french they designed and made this part and the tranny. frickin resource sharing with renault.

Prosport Gauges · 07-14-2010, 10:38 AM

--------------------------------------------------------------------------------

does anyone know if they have changed over the slave cylinder part numbers over the years? is the nismo slave stronger.

Just found this with a 30sec search on yahoo.

NISMO Slave Cylinder - Nissan SR/KA [ NIS-SLV ] - Enjuku Racing - Performance Parts and High Quality Fabrication

its for a 240 but maybe there the same

KillerBee370 · 07-14-2010, 11:45 AM

Quote:

Originally Posted by Ryan@prosportGauges

--------------------------------------------------------------------------------

does anyone know if they have changed over the slave cylinder part numbers over the years? is the nismo slave stronger.

Just found this with a 30sec search on yahoo.

NISMO Slave Cylinder - Nissan SR/KA [ NIS-SLV ] - Enjuku Racing - Performance Parts and High Quality Fabrication

its for a 240 but maybe there the same

Good find. Diving deeper into this today when I get back from class...

07-13-2010, 01:41 PM	#17 (permalink)
vividracing The370Z.com Sponsor Join Date: Jun 2009 Location: Gilbert, AZ Age: 38 Posts: 7,306 Drives: 350Z,370Z,GTR Rep Power: 39	This is Phil @ Vivid Racing! I am sorry that the cylinder failed. I called you maybe last week. Unfortunately I have found out that as of the moment there is no aftermarket available (according to Stillen and JWT). BUT after I have informed Stillen and JWT they are doing some research into this. Both companies really can't believe that this has happened to a 370z. I will keep trying to look for a solution for you hopefully something will pop up. I have a lead from the great guys at Stillen telling me that the "jdm" cylinder they have heard might be better. I am trying to locate and get one for you. I hope everything works out and I will keep you updated to my findings. Thanks, Phil __________________ Rocky @ Vivid ♦ 480.966.3040 x236 ♦ Rocky@vividracing.com Email, PM, or call me directly for aggressive The370Z.com member pricing!!!

07-13-2010, 02:08 PM	#18 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6962	IIRC a member from Australia had his master cylinder fail with the stock clutch... wonder if the clutch is really the culprit of the failure or if it was just a defective unit in your car, KB? __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

07-13-2010, 02:13 PM	#19 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	I don't think it's the clutch, but I've heard the slave cylinder is the weakest link. Nissan issued a recall with the '07 Z with some users reporting sudden loss of clutch pedal pressure causing it to sink to the floor. At least one owner got in a bad accident because of the pedal sinking to the floor. Recall on slave cylinder - MY350Z.COM Forums I'm surprised this issue exists with the 370Z. __________________

07-13-2010, 03:15 PM	#20 (permalink)
Zat_Zuma A True Z Fanatic Join Date: Nov 2008 Location: Edmonton, Alberta ...eh Posts: 1,171 Drives: 2017 Touring auto Rep Power: 19	I'm not surprised the stock CSC is a piece of junk and will not handle the pressures of a heavier pressure plate. Read this: CuztomPartZ HR CSC Concentric Slave Cylinder Upgrade and INFO - MY350Z.COM Forums __________________ [B]2009 & 2017 370Z Touring Sport Autos SOLD

07-14-2010, 05:30 AM	#28 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	CONCENTRIC SLAVE CYLINDER master-slave i know i'm a finicky a$$ about this stuff Also lots of cars now a days use the concentric slave cylinder/combined throwout bearing setup, it isn't new it's just failed engineering thank the french they designed and made this part and the tranny. frickin resource sharing with renault. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50 Last edited by 1slow370; 07-14-2010 at 05:36 AM.

07-13-2010, 03:57 PM	#21 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1119	I was warned about this a few weeks after I installed my new clutch. I've been talking to ZSP because they are engineering a full metal CSC replacement, not sure what the status on that is. Unfortunately, my clutch is a ticking time bomb right now. Fortunately, my Southbend clutch is a lot less stiff than the JWT so it should help lengthen the life of my CSC. Hopefully I get lucky and it doesnt happen for a good while, but I'm going to get AAA in the meantime.

07-13-2010, 04:47 PM	#22 (permalink)
KillerBee370 A True Z Fanatic Join Date: Mar 2009 Location: So Cal baby! Age: 51 Posts: 5,964 Drives: with passion Rep Power: 321	The technitian that is responsible for my car is out today so I couldn't get an answer as to weather it was definitively the Clutch Master Cylinder or the Concentric Secondary Cylinder. I too would like to clear this up. I will try to get my hands on the failed part/s in question so that I can take some pics and possibly get these item/s into the hands of JWT and or Stillen etc. so that some R&D can happen.

07-13-2010, 06:07 PM	#24 (permalink)
ste01 Base Member Join Date: Apr 2010 Location: St Helens England Posts: 28 Drives: 370z GT Rep Power: 15	I had the same problem 2 weeks back while driving the Alpenstrasse in Germany, driving along, go to change down and clutch pedal goes straight to the floor no pressure what so ever, the following morning clutch pressure was back checked fluid level all was ok. Got the Z to the dealership after convincing them there was a problem it took them 3 days to get approval and parts from Nissan. They replaced the slave cylinder, CSC (in the old days would be the release bearing) and the steel hydraulic pipe to the CSC. Had a look at the parts when collecting the Z and it was the CSC that had gone and this was with only 4550 miles on the clock

07-13-2010, 06:10 PM	#25 (permalink)
ste01 Base Member Join Date: Apr 2010 Location: St Helens England Posts: 28 Drives: 370z GT Rep Power: 15	forgot to say stock clutch assy

07-13-2010, 10:50 PM	#26 (permalink)
wishihadnav A True Z Fanatic Join Date: Nov 2009 Location: 90090 Posts: 1,851 Drives: Force Fed Nismo Rep Power: 184	Damn I want a clutch upgrade but this is making me a little hesitant.

07-14-2010, 10:38 AM	#29 (permalink)
Prosport Gauges Banned Join Date: Mar 2010 Location: Tampa Posts: 339 Drives: 2009 370z Rep Power: 0	-------------------------------------------------------------------------------- does anyone know if they have changed over the slave cylinder part numbers over the years? is the nismo slave stronger. Just found this with a 30sec search on yahoo. NISMO Slave Cylinder - Nissan SR/KA [ NIS-SLV ] - Enjuku Racing - Performance Parts and High Quality Fabrication its for a 240 but maybe there the same

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