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Clutch Problems, Supercopper Mix 34 Gtr

dodd1990
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dodd1990 Contributor

dodd1990

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Hey guys, just a question to throw out there, But I have a 34 GTR running 350kw with a Nismo supercopper mix which is only 6 months old.

However the clutch pedal has recently been getting softer and seems to have less travel, does anybody know what causes that? ive bleed the clutch but that didnt seem to fix anything.

Also my old R34 had clutch problems with the hydraulic parts, and i dont want to waste money with the GTR, is it possible to convert it to a pull type cable clutch?

post-66547-0-88650500-1332659985_thumb.jpg

GTRNUR Grand Master

GTRNUR

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Have a look at getting your slave cylinder re-sleaved. Its probably leaking past the piston and reducing travel at the throw-out lever. The master cylinder can also need attention, but usually the slave is in worse shape.

Also bleeding these can be tricky, as they have a loop for "cooling" the clutch fluid... which creates a nice air trap. Look for a block with a bleed fitting located directly down and back a bit from the clutch master cylinder.

The only upgrade worth considering is swapping out the loop and stock plumbing for the nismo braided hose that goes directly from the master cylinder to the slave.

Push to pull conversions relate to using different types of clutches in the R34 gearbox. All require gearbox removal. None would use a cable. They are all hydraulic and all use the booster so that your pedal doesn't feel like your driving a 5 ton truck. The stock systems work perfectly when they are in good condition.

dodd1990 Contributor

dodd1990

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The only upgrade worth considering is swapping out the loop and stock plumbing for the nismo braided hose that goes directly from the master cylinder to the slave.

I have decided to upgrade with a braided hose straight to the slave, but would u recommend the nismo slave or a genuine Nissan one? can the genuine one handle a supercoppermix clutch? or am i wasteing my time with that? also im sure its on SAU somewhere but its a R34 GTR a push or pull slave cylinder lol ?

GTRNUR Grand Master

GTRNUR

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Keep the standard slave cylinder and just re-sleave it. Once its fitted with a stainless sleeve it will out-last the life of the car.

The Nismo one has reduced throw due to having a larger piston bore, and can lead to problems like you are already having.

The braided hose is really going to help you bleed it properly.

Standard copper mix clutches handle 400kw easy. They rate them as a 600ps clutch (around 590-600hp). There is a competition version that is rated at 780ps if thats not enough. I've got a modified early version in my car and its still mild enough to drive to the shops or in slow traffic.

Edit: All slave cylinders "push". Its the operation of the throwout lever moves the throwout bearing that determines push or pull type. R33/R34 and some late R32's are pull. R32 are push.

R.3.2.G.T.R Grand Master

R.3.2.G.T.R

Posted
Posted

Keep the standard slave cylinder and just re-sleave it. Once its fitted with a stainless sleeve it will out-last the life of the car.

The Nismo one has reduced throw due to having a larger piston bore, and can lead to problems like you are already having.

The braided hose is really going to help you bleed it properly.

Standard copper mix clutches handle 400kw easy. They rate them as a 600ps clutch (around 590-600hp). There is a competition version that is rated at 780ps if thats not enough. I've got a modified early version in my car and its still mild enough to drive to the shops or in slow traffic.

Edit: All slave cylinders "push". Its the operation of the throwout lever moves the throwout bearing that determines push or pull type. R33/R34 and some late R32's are pull. R32 are push.

who does re-sleaving, powersteering joint? any business u recommend i can check here in syd?

GTRNUR Grand Master

GTRNUR

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Posted

who does re-sleaving, powersteering joint? any business u recommend i can check here in syd?

Anyone that does brake system reconditioning work such as caliper refurbs etc should be able to do it.

dodd1990 Contributor

dodd1990

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Does the nismo braided hose bypass the dampening/cooling circuit? How long is the hose? It must be like 40-50cm long if it does? I've been trying to buy one but don't want to buy the wrong thing

GTRNUR Grand Master

GTRNUR

Posted
Posted

Yes it replaces the loop. Everything you need to know is in the part description here...

http://www.rhdjapan.com/nismo-stainless-braided-clutch-hose-bnr34-r34-12334

You can probably source it in australia easily enough though. I've seen them on Ebay occasionally and just jap or high octane probably have them in stock too.

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