Unknown rattling noise

[DOUGMO]

occasionally

 

[3VOLUTIONIST]

Weird. Wound the boost bleed right down to stock. Hopped in, drove from curtin uni to hilarys. No prolems.

 

[evo-gsr]

Probably less load on the clutch with less boost

 

[GeoKez]

Its your free bits of metal moving around. I blew mine at an event and didn't know anything was wrong until I was reversing into a cool down spot. Didn't really understand what was happening, stopped the car, started it to drive home, pressed the clutch and it made all these fucked up sounds (as you described in your 1st post). After a few goes I got it into gear and drove home (airport to ocean reef), over the next few days it seemed fine just doing testing around the block. So I thought it was OK and took it to the next event and got burnt. I did two recce runs then as I lined up for the first run, a bit of left over damper cap (as per photo) moved position and jammed in the fingers, clutch wouldn't disengage and game over. Good thing to have happen it the end, it ended up being the difference between just a new clutch kit, and a new flywheel and clutch kit. Before I started believing what the other guy's on here were saying, I changed it out with an Exeddy, so will no doubt be going through this again soon.

 

[3VOLUTIONIST]

Ordered a new master cylinder, will see if that remedies the problem at all, probably not, but it needs to be changed anyway and I'd rather not spend 500 bucks on a clutch if I don't have to.

 

[evo-gsr]

A master cylinder will not cure the rattling you mention. I can assure you of that.

 

[4piknup]

You can just put a clutch plate in it.
Gotta get it apart to see what is wrong tho

 

[evo-gsr]

Been trying to tell him that all along.....

 

[3VOLUTIONIST]

You can just put a clutch plate in it.
Gotta get it apart to see what is wrong tho

Yeh, I don't think the Master cylinder is going to do anything, but I can't get it apart until the weekend, need car for uni

 

[4piknup]

You moght be lucky and not need a tow truck before the weekend

 

[3VOLUTIONIST]

Looking at either this: http://catalogue.clutchindustries.com.au/product/view/97203/RPM1221N-SSCC or this http://catalogue.clutchindustries.com.au/product/view/97203/RPM1221N anyone used them before? the current clutch is just the OEM replacement model from this bunch, maybe it was just too weak for the power being produced

 

[evo-gsr]

Ha ha ha nice one Jack.

 

[3VOLUTIONIST]

well. Thing drove like a total dog today, shuddered horribly whenever I applied anymore than -5psi, was pretty much undriveable. Take it to the shed, swapped out the Mater cylinder.
Test drove it, way better, still shuddered a little but nowhere near as much and actually managed to hold 10psi. Swapped out the ignitor and leads. Held 16psi and drives fine :wacko:
Freakin cars.

 

[BMGTZ]

and it still rattles?

 

[3VOLUTIONIST]

Well it's nowhere near as loud as it was, i've heard it make a single 'clink' noise a couple of times, like something metal just rolling over once. But it happens when i go over a bump in the road.

After driving it round tonight i had to turn the boost back down to 10psi as it was just slipping at any more than that. No shudder, just slips like the clutch is worn out. The master cylinder is adjusted properly so i know it's not partially disengaging the clutch when i don't have my foot on it.

But it only slips when it's been driven for a while, if i park it or let it idle for a few minutes it won't slip for a bit, but will eventually start doing it again

 

[khubner1]

as everyone has said the clutch pressure plate and possibly even the clutch disk are fubar

 

[4piknup]

Keep driving it and boosting.
The bit that eventually falls out is the broken bit.
You made it to the weekend so thats good

 

[3VOLUTIONIST]

Well its's done ~850km since it initially started rattling last friday. Went to Dowerin, managed a motorsports even there and drove back. Then 150km of uni and back this week. And 180km this evening. The slipping is the only issue at the moment, and without disassembling the whole front end to get the gearbox off it's hard to tell what the problem is

 

[BMGTZ]

dont take this the wrong way.....but... no ...it isnt hard.

THE CLUTCH IS FUCKED......if you keep driving the bloody thing it will cost more to fix. it is inevitable it will fail to the point it will grind gears....then it costs a box repair. At present the loose spring might be chaffing a groove it your flywheel.....keep going and see if you can let the flywheel out of the bell housing. just remember that flywheel in on the same side of the car as your nut sack with not a lot in between

 

[3VOLUTIONIST]

dont take this the wrong way.....but... no ...it isnt hard.

THE CLUTCH IS FUCKED......if you keep driving the bloody thing it will cost more to fix. it is inevitable it will fail to the point it will grind gears....then it costs a box repair. At present the loose spring might be chaffing a groove it your flywheel.....keep going and see if you can let the flywheel out of the bell housing. just remember that flywheel in on the same side of the car as your nut sack with not a lot in between

No insult taken
I still reckon the clutch is stuffed, but dad's a bit iffy on it, I don't blame him, it's only done 15,000km, doesn't get driven ridiculously hard, have never dropped the clutch, and he's never seen a spring pop out of a clutch plate before (doesn't help that they looked perfectly fine when we inspected it)