ok took my car down to get set up today it didn't go to well the guy didn't turn up to work and on the way home i accelerated hard in 5th and got a rumbling noise from rear and revs went up with out speed sounds like clutch so tryed it from stand still and nothink all they way through to 160mph so back to 4th just brought up to 3000rpm and nailed the throttle and rumble and slip again put it 5th and same think again then drove normal for about 5 miles tryed again and nothink, drives perfect other than this and have never had this problem b4 today so any one have any ideas car has 6 plated paddle clutch in it and has done about 15000 miles clutch is very heavy and greaks a bit diff mount is worn a little so brought a new one as well car is on greys low comp p/p head t38 closed loop rs 500 cooler etc any ideas for clutch replacement or advise on problem would be fantastic

 

Hard to say without driving it, but it sounds like LSD problem, maybe clutch.

HTH Regards Dave

 

having a simlar dilemma lol

whats it pushing????

 

I also would say it's diff related, the diffs don't cope that well with big power especially if you like launching as have weak planet gears, also due to the age now the viscous coupling is probably past it's best and could do with a re-rate. Best thing I done was to ditch my paddle clutch, made for a horrible drive and made pedal heavier, I don't think this is causing your problem though.

Martin

 

whats the best way to check this then as dont really want to throw 450 at a clutch or same sort of money with a diff

 

i would say its putting out any where in the region of 380-400 but didnt get it put on rollers today so cant be sure

 

Dave,

It does definitely sound like the viscous unit in the LSD, your paddle clutch should be okay with the power your putting thru it, I see this problem a lot on 4x4's with a viscous centre diff in their transfer boxes.

Cheers Dave

 

how do you re rate the viscous coupling then mate

 

as martsmart has stated, the 6 paddle clutches are poop.
They do cope with greater torque than an organic, but they don't last very long at all.
My old saph had an ap6 paddle, and the pads wore down to the rivots in less than 5k miles. have pictures to prove. You can get them repadded but the friction material is too hard and the pad areas are too small to cope with the shock waves when the plate enganges with cover and flywheel, + it beats the shit out of the flywheel face.

 

my last 6 paddle did 75k miles of road use in 3 years with no issues at 400bhp

the alcons are lighter than a std clutch, and ive run them and over 500bhp

 

mine didnt lol.

 

Dave,

There isn't much you can do with a knackered viscous, apart from replace it or....if funds are okay buy an upgrade "clutch plate" type LSD for the cossie diff, which last longer, can be adjusted and can be rebuilt with new clutches when they're buggered.

I'd avoid a s/h viscous they are all usually knacked or don't last long.

As for the paddle clutch, its like any clutch, with naff / animal driving it can be worn out very quickly, but with decent launching technique and no abuse they are fine, as James said.

Cheers Dave

 

pulled it apart today and the clutch was on the rivits also pulled the diff apart all is good internally apart from one small chip about 2.5mm 1mm deep on one of the planet gears been looking for a new planet gear but cant find one the diff works ok would like to re-rate it tho but can't get the bearing casings un-done at moment to strip it right down also brought new service kit for the diff whats the best oil to run in it and how to re-pack the vc

 

 

 

Glad you found problem, I guess it hasen't damaged flywheel? GL5 SAE90 or 75W/90, couple of litres will be ample.

Does your kit include fluid for the VC as well as don't think this is easy job to do.

Martin

 

not yet brought a kit yet but will have the fluid for the vc unit will be stripping it down though

 

flywheel will be getting replaced with a lightened one from burtons

 

By the look of the diff picture thats not a viscous diff, ??? Got any better pics showing complete guts?

How many miles has that clutch done ? It's shagged lol, perhaps a multiplate would be better suited for your car?

Regards Dave