Stiff clutch when going hard

[Lorisk1]

Morning everyone. ve commy 07 - 231ks on it
Took a mate for a hoon, and noticed my 3rd to 4th gear change was stiff and hard to push.
noted, and just drove nicely because i had no idea what just happened.

on my trip back home i over-took a chain of cars top of 4th. same thing happened .
giving it crap in 4th and was stiff into 5th.

only when giving it crap, it happens.. clutch doesn't slip.
would that be the pressure plate or is it a dual mass flywheel?
new clutch assembly im guessing?

just got the car cammed too, my wifes gonna flip lmao

 

[hademall]

Cool rego plate. Is it personalised?

 

[Lorisk1]

Cool rego plate. Is it personalised?

nah mate, factory nz plate

 

[BlackVXGTS]

Try doing a full flush on your clutch fluid, preferably with fluid rated around 550F or 600F.

 

[losh1971]

Try doing a full flush on your clutch fluid, preferably with fluid rated around 550F or 600F.

Agree with this, but I'll add you may want to take it to a competent garage. These things are pricks to do right and even trained people can struggle with them.

 

[vr304]

If it’s still the original clutch then it’s probably due for replacement, go for an aftermarket heavy duty one with a single mass flywheel and get the bleeder extension while you’re at it to make bleeding the clutch a lot easier

 

[Lorisk1]

If it’s still the original clutch then it’s probably due for replacement, go for an aftermarket heavy duty one with a single mass flywheel and get the bleeder extension while you’re at it to make bleeding the clutch a lot easier

Reasons for single mass and HD? I was thinking just OEM replacement everything. Would driveability be worse?
427hp atw 511nm torque.
Thanks for the bleeder tip. New to holdens

 

[J_D 2.0]

Reasons for single mass and HD? I was thinking just OEM replacement everything. Would driveability be worse?
427hp atw 511nm torque.
Thanks for the bleeder tip. New to holdens

Dual mass is another failure point as it’s got springs and bearings in it so the smart money removes this point of failure by going SMF. They are also only designed for factory horsepower so it will fail sooner if your engine is modified/tuned.

If yours is a 2007 it should have a SMF anyway as DMFs didn’t become a thing until 2012 IIRC (my SSV is SMF and it’s a 2009).

For the posterity of anyone else looking to change to SMF from DMF, you can’t just buy a standard SMF setup and call it a day. You must buy a specific DMF to SMF conversion kit which accounts for the thicker DMF flywheel as a standard SMF flywheel setup won’t engage the clutch properly with the gearbox shaft as the shaft will be too short.

Possibly the other way to go about it is to replace the whole gearbox with a SMF gearbox, which has a shorter bellhousing but I haven’t verified this.

 

[vr304]

Dual mass is another failure point as it’s got springs and bearings in it so the smart money removes this point of failure by going SMF. They are also only designed for factory horsepower so it will fail sooner if your engine is modified/tuned.

If yours is a 2007 it should have a SMF anyway as DMFs didn’t become a thing until 2012 IIRC (my SSV is SMF and it’s a 2009).

For the posterity of anyone else looking to change to SMF from DMF, you can’t just buy a standard SMF setup and call it a day. You must buy a specific DMF to SMF conversion kit which accounts for the thicker DMF flywheel as a standard SMF flywheel setup won’t engage the clutch properly with the gearbox shaft as the shaft will be too short.

Possibly the other way to go about it is to replace the whole gearbox with a SMF gearbox, which has a shorter bellhousing but I haven’t verified this.

It’ll be a DMF for sure even my old vx ss had a DMF standard so would find it hard to imagine the ve would run a single mass

 

[vr304]

Reasons for single mass and HD? I was thinking just OEM replacement everything. Would driveability be worse?
427hp atw 511nm torque.
Thanks for the bleeder tip. New to holdens

Because your car has been modified and making a lot more power than it did from factory and alot of decent quality heavy duty clutches drive really nice, pretty much like standard as long as you dont go buying a ceramic button clutch those are **** to drive and unnecessary for you power level, I made the mistake of putting one in my old cammed manual vr clubsport was a **** of thing to drive in traffic