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

jadeb0x · 08-10-2010, 11:34 AM

thanks for the heads up, now i know what i should do when i eventually replace my stock clutch.

ever since my clutch master cylinder went out and was replaced under warranty... i've been afraid to really get on the gas in fear of it breaking again. search for the other thread for more info, i wasn't the only one that was affected.

Seb@SZ · 08-10-2010, 12:40 PM

Quote:

Originally Posted by LateralG'z

It's Tuesday, where are my pics?

A little patience never hurt anybody.

We're working on machining out the last bit on the bearing adapter.
Here's some pics of our flywheel and clutch to tide you over.

For those curious on our newest clutch design check this post:
http://specialtyz.com/blog/?p=45

Also some info on clutch disc weights:
http://specialtyz.com/blog/?p=481

LateralG'z · 08-10-2010, 06:43 PM

Its looking good, but I still want more lol

1slow370 · 08-11-2010, 04:39 AM

Quote:

Originally Posted by Zat_Zuma

I understand that the CSC failed on your setup with the JWT combo. I actually have one that I choose not to install and when I measured the stock CSC fitment on the JWT pressure plate I was appalled that anyone would install or recommend this pressure plate with the stock CSC. The fitment was that bad. It was obvious that it would fail, it was just a matter of when. I'm surprised that it lasted 10K miles. I had all sort of problems with my 07 350Z when I installed the JWT combo and at least now I understand why. I would recommend the bearing sleeve be installed with the JWT clutch combo as the alignment is much better.

This is why when the CSC bearing sleeve became available for the stock CSC, I checked into it and learned all sort of things. The more I researched, the more I realized the JWT combo was not for me. It was nice to actually find a company that researched and recommended a clutch setup for our cars that actually had real world testing behind it.

That being said, I do know that the stock CSC with the bearing sleeve may not be the final answer but at least it gives the stock CSC a fighting chance with proper alignment and spacing with the pressure plate fingers.
It will probably take years for me to find out as I only put around 5K miles per year on my car. By the time the CSC needs to be replaced, I'm hoping that a better replacement will be available.

Yeah i'm starting to think it's less of an alignment problem that is causing the high failure rate. it may be a factor but given that stock clutches are screwing up the csc's it probably has more to do with the much higher spring rate. the stock csc is designed to be sluggish as well, and if you took one apart and looked at all the plastic and the $hity little o ring that is supposed to hold back all that pressure it's no wonder their popping like drunk girls after prom.

Zat_Zuma · 08-11-2010, 06:25 AM

Quote:

Originally Posted by 1slow370

Yeah i'm starting to think it's less of an alignment problem that is causing the high failure rate. it may be a factor but given that stock clutches are screwing up the csc's it probably has more to do with the much higher spring rate. the stock csc is designed to be sluggish as well, and if you took one apart and looked at all the plastic and the $hity little o ring that is supposed to hold back all that pressure it's no wonder their popping like drunk girls after prom.

I agree the CSC isn't designed to handle any kind of major higher spring rate on a pressure plate and the O-ring will eventually fail. My expectation is that the stock CSC will fail in my install and I'll have to replace it. I just hope something better will be available when that happens.

RCZ · 08-11-2010, 03:24 PM

I have like 2k miles on my southbend stage 4 and it works flawlessly. Knock on wood.

KillerBee370 · 08-11-2010, 04:38 PM

Seb, any chatter on that flywheel? My JWT weighs in at 16 lbs. but chatters like a mofo at stop lights etc.

It's to be expected I guess. And well worth the tradeoff of an added 5 whp on the dyno. No doubt yours will yield similar results.

Seb@SZ · 08-11-2010, 09:39 PM

Quote:

Originally Posted by KillerBee370

Seb, any chatter on that flywheel? My JWT weighs in at 16 lbs. but chatters like a mofo at stop lights etc.

It's to be expected I guess. And well worth the tradeoff of an added 5 whp on the dyno. No doubt yours will yield similar results.

Not much chatter or noise, being that ours is a little heavier we get away from alot of the noise.

I'll have pics of our bearing tonight.

destinyZ · 08-11-2010, 10:42 PM

Watching!

KillerBee370 · 08-11-2010, 11:05 PM

Quote:

Originally Posted by Seb@SZ

Not much chatter or noise, being that ours is a little heavier we get away from alot of the noise.

I'll have pics of our bearing tonight.

Nice. Can not wait!

LateralG'z · 08-11-2010, 11:07 PM

Nice post and It looks good.

1slow370 · 08-14-2010, 07:11 AM

i had 2000 on my jwt and no issues until my thrust bearing died (oil cooler not clutch) and had to yank it

markymark · 09-03-2010, 07:31 AM

ATS seem to have run into the same problem re CSC failure

"After many trials and errors ,
ATS concluded the best way is to give up the CSC and use a withdrawal lever , the similar
activation system used for 350Z early model with DE motor."

Active Traction Service

http://www.ppi-ats.com/ATS%20350Z%20...utch%20web.pdf

350Sp3nce · 02-16-2011, 11:37 PM

hey i was just reading your post

http://my350z.com/forum/engine-drive...voir-swap.html

My leg has been seriously damaged from this clutch kit and I am wondering what to do. I had it done at the nissan dealer since my used 03 had a bad tranny when i bought it from them. The clutch it stiff as **** and my gearhead friends agree with me (not always ie: your just being a pussy[usually mustang ***s]). Anyway, if their not following the steps that you list.... Any suggestions? Finding your post was a great find for me because I am about to build a case against that shop. If your steps were not followed exactly, would the clutch be stiff as hell?

Never buy a jwt clutch.... It will kill your leg

-Spencer

1slow370 · 02-22-2011, 05:00 AM

no offense dude and i can't say much for or against it but if you are blaming a clutch pedal for Screwing you up you have some rethinking to do there, i have a rebuilt left leg and 0 problems with the jwt clutch. you do more damages to your knee climbing a flight of stairs than pushing your clutch in a 50 times. you may have had preexisting muscle, cartilage, or tendon damage and the failure happened to coincide with your clutch change. Or if you are overweight/really tall, your joints can have considerably more stress put on them than someone who is 5.10 180lbs. Thats like a body builder suing his gym cuz his knee gave out in a squat.

08-10-2010, 11:34 AM	#76 (permalink)
jadeb0x Base Member Join Date: Dec 2009 Location: Atlanta, GA Posts: 136 Drives: 09 370Z PW M6 Rep Power: 15	thanks for the heads up, now i know what i should do when i eventually replace my stock clutch. ever since my clutch master cylinder went out and was replaced under warranty... i've been afraid to really get on the gas in fear of it breaking again. search for the other thread for more info, i wasn't the only one that was affected. __________________ www.jadecrew.com Volk Racing // MXP // Espelir // Project Kics

08-10-2010, 06:43 PM	#78 (permalink)
LateralG'z Track Member Join Date: Nov 2009 Location: Oklahoma Posts: 876 Drives: 370z Rep Power: 17	Its looking good, but I still want more lol __________________ 2010 Mag Black, 6MT,

08-11-2010, 11:07 PM	#86 (permalink)
LateralG'z Track Member Join Date: Nov 2009 Location: Oklahoma Posts: 876 Drives: 370z Rep Power: 17	Nice post and It looks good. __________________ 2010 Mag Black, 6MT,

08-14-2010, 07:11 AM	#87 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	i had 2000 on my jwt and no issues until my thrust bearing died (oil cooler not clutch) and had to yank it __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

02-16-2011, 11:37 PM	#89 (permalink)
350Sp3nce Base Member Join Date: Feb 2011 Location: WI Posts: 1 Drives: US Rep Power: 14	ouch! hey i was just reading your post http://my350z.com/forum/engine-drive...voir-swap.html My leg has been seriously damaged from this clutch kit and I am wondering what to do. I had it done at the nissan dealer since my used 03 had a bad tranny when i bought it from them. The clutch it stiff as ** and my gearhead friends agree with me (not always ie: your just being a pussy[usually mustang *s]). Anyway, if their not following the steps that you list.... Any suggestions? Finding your post was a great find for me because I am about to build a case against that shop. If your steps were not followed exactly, would the clutch be stiff as hell? Never buy a jwt clutch.... It will kill your leg -Spencer

08-11-2010, 03:24 PM	#81 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1119	I have like 2k miles on my southbend stage 4 and it works flawlessly. Knock on wood.

08-11-2010, 04:38 PM	#82 (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	Seb, any chatter on that flywheel? My JWT weighs in at 16 lbs. but chatters like a mofo at stop lights etc. It's to be expected I guess. And well worth the tradeoff of an added 5 whp on the dyno. No doubt yours will yield similar results.

08-11-2010, 10:42 PM	#84 (permalink)
destinyZ Enthusiast Member Join Date: Apr 2010 Location: Guam, USA Age: 36 Posts: 415 Drives: FROM INDIANA Rep Power: 15	Watching!

09-03-2010, 07:31 AM	#88 (permalink)
markymark Base Member Join Date: Jul 2009 Location: Sydney Posts: 51 Drives: white 370z 6MT Rep Power: 16	ATS seem to have run into the same problem re CSC failure "After many trials and errors , ATS concluded the best way is to give up the CSC and use a withdrawal lever , the similar activation system used for 350Z early model with DE motor." Active Traction Service http://www.ppi-ats.com/ATS%20350Z%20...utch%20web.pdf

02-22-2011, 05:00 AM	#90 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	no offense dude and i can't say much for or against it but if you are blaming a clutch pedal for Screwing you up you have some rethinking to do there, i have a rebuilt left leg and 0 problems with the jwt clutch. you do more damages to your knee climbing a flight of stairs than pushing your clutch in a 50 times. you may have had preexisting muscle, cartilage, or tendon damage and the failure happened to coincide with your clutch change. Or if you are overweight/really tall, your joints can have considerably more stress put on them than someone who is 5.10 180lbs. Thats like a body builder suing his gym cuz his knee gave out in a squat. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

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