Screw it! I'm getting Wilwood clutch MC. - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

dongoesby · 11-16-2009, 04:43 AM

Background story in case if you bother to read it:
http://zilvia.net/f/tech-talk/280761...ure-plate.html

Cliff notes:

upgraded clutch with dual diaphragm pressure plate (harder pedal)
slave cylinder pushrod not traveling far enough for clutch to disengage
slap a 8mm socket on slave cylinder pushrod/piston = problem solve

After a month driving, the clutch pedal stiffness is unbearable. I basically drag myself to walk after an hour's driving. I got a new oem clutch master cylinder and an used nismo slave cylinder. After installation, no, the clutch won't disengage. The problem got worse than the old stock slave cylinder. I used the same old trick of a 8mm socket slap on that nismo slave cylinder, not much help, not disengaging.

Base on my trial and error, i know my old hydraulic system is fine, because they all worked for one month's driving without any leakage. The new clutch MC is working too because there is no freeplay on the clutch pedal. Also, I'm sure that the clutch pedal bracket is not bended. From here, i conclude that our nissan hydralic system is not strong enough to push heavy duty pressure plate.

Zilvia people who have heavy duty clutchs (stage 2 or stage 3, etc), please confirm with me on this. What master and slave are you guys using? Necessary for reinforced clutch pedal bracket?

I've researched that many Toyota people had to upgrade their slave pushrod because the stock one is not long enough to push the same length due to the extra pressure from heavy duty clutch. They have to buy this.

On that other hand, I also confrimed that a smaller MC (Stock) will shorten the slave cylinder travel when using with a bigger Salve (Nismo). This reason explains why I couldn't dissengage my clutch when using a nismo slave while I could when I was using a stock one.

To avoid the risk of exploding slave for using extended pushrod on the stock clutch MC, i'm going to try using a bigger MC (Wilwood). It is 3/4 vs 5/8 stock. I know it is not a huge different, but I want my car able to pop into gears without leg-breaking pedal stiffness. I know a bigger MC will require less leverage to push the slave piston more, but it will also make pedal harder to push. I need your opinion on this.

Am I really in a position that my clutch requires me to upgrade my hydraulic system? Is a bigger MC going to help me in my situation?

11-16-2009, 04:43 AM	#1
dongoesby Zilvia Addict Join Date: Mar 2007 Location: San Francisco Age: 38 Posts: 756 Trader Rating: (17) Feedback Score: 17 reviews	Screw it! I'm getting Wilwood clutch MC. Background story in case if you bother to read it: http://zilvia.net/f/tech-talk/280761...ure-plate.html Cliff notes: upgraded clutch with dual diaphragm pressure plate (harder pedal) slave cylinder pushrod not traveling far enough for clutch to disengage slap a 8mm socket on slave cylinder pushrod/piston = problem solve After a month driving, the clutch pedal stiffness is unbearable. I basically drag myself to walk after an hour's driving. I got a new oem clutch master cylinder and an used nismo slave cylinder. After installation, no, the clutch won't disengage. The problem got worse than the old stock slave cylinder. I used the same old trick of a 8mm socket slap on that nismo slave cylinder, not much help, not disengaging. Base on my trial and error, i know my old hydraulic system is fine, because they all worked for one month's driving without any leakage. The new clutch MC is working too because there is no freeplay on the clutch pedal. Also, I'm sure that the clutch pedal bracket is not bended. From here, i conclude that our nissan hydralic system is not strong enough to push heavy duty pressure plate. Zilvia people who have heavy duty clutchs (stage 2 or stage 3, etc), please confirm with me on this. What master and slave are you guys using? Necessary for reinforced clutch pedal bracket? I've researched that many Toyota people had to upgrade their slave pushrod because the stock one is not long enough to push the same length due to the extra pressure from heavy duty clutch. They have to buy this. On that other hand, I also confrimed that a smaller MC (Stock) will shorten the slave cylinder travel when using with a bigger Salve (Nismo). This reason explains why I couldn't dissengage my clutch when using a nismo slave while I could when I was using a stock one. To avoid the risk of exploding slave for using extended pushrod on the stock clutch MC, i'm going to try using a bigger MC (Wilwood). It is 3/4 vs 5/8 stock. I know it is not a huge different, but I want my car able to pop into gears without leg-breaking pedal stiffness. I know a bigger MC will require less leverage to push the slave piston more, but it will also make pedal harder to push. I need your opinion on this. Am I really in a position that my clutch requires me to upgrade my hydraulic system? Is a bigger MC going to help me in my situation? Last edited by dongoesby; 11-16-2009 at 05:07 AM..