Clutch Slipping Since Rb25 G/box Conversion :(

[kudos.motorsports]

Matt this is really going to be a trial and error procedure. However my guess is that the used bearing carrier is too long, and is continually applying the thrust bearing to the pressure plate. Therefore the clutch is not seeing 100% of the clamping force which is allowing to "slip" when the engine in making power. If this is the case go see a clutch specialist they will sort you out.

However as BHDave has stated if there is any grease or oil that may have contacted the flywheel this may be the cause of the problem. As soon as there is a "liquid" lubricant comes in contact with the clutch face, it's a death sentence. I strongly recommend that when installing the carrier bearing to use graphite powder rather then grease, this will not affect the clutch in anyway.

No matter what the problem I strongly discourage you from driving the vehicle until you have solved the problem. If you glaze the clutch plate(s) you might as well throw the item in the bin.

[huddy]

the saga continues :S

going to take it down tomorrow and trial with a different (shorter carrier) also - as i have heard from other pple that this does make a difference

ALSO that rb20 box carriers are interchangable ? :S guess i'll find that one out...lol...

i totally agree with u bigsully - but its only slipping in 4th and 5th gear atm as i'm running no boost / no load/ under 3000rpm (running in new rings and bearings) BUT its not a daily car so just down to the workshop.

*sighs...

[dangerous_daveo]

When I did my conversion. The only things that were changed was the slave. Same pressure plate, replacement fly wheel, and new rb20 clutch with all those new bearings and stuff. I also got a few new seals on the box just to be on the safe side. Mine works fine, can chirp 5th (which I didnt mean to do, but it can do it! so it aint slipping).

So Id do what the others are saying, and go back to stock stuff.

[Bl4cK32]

Bl4ck32,

I noticed with the new clutch I had fitted the thrust bearing sat noticably forward on the carrier compared to the previous fairly std organic clutch.

I've noted the same with heavy duty clutches in the VS and previous cars.

My guess is, if your OS clutch was bought new to suit an RB25 it would simply come with a thrust bearing, no carier.

That thrust bearing would sit in the correct position on the std carrier in order achieve the correct positioning on the rb25.

Unless its impossible for the given clutch setup to use the std carrier with a specific thrust bearing.

That does sound unlikely as there's nothing special about a carrier that simple modification (when manufacturing) of the thrust bearing couldn't sort out.

yer when i gave them my twin plate, i also gave them the thrust bearing/ and carrier. They said both were the wrong ones, and supplied a new bearing+carrier for about $40 i think it was. I installed the clutch, fit the new carrier and fork, and havent had any troubles with the setup apart from the shagged master which ive replaced since

[huddy]

$40??? thats awesome was going to trial a different carrier tomorrow but i may do what you did and take my existing carrier down with the clutch and the thrustbearing and see what they say... sorry i forgot did u say you had a twin plate? OS ? if so did they just give you the equivalent thrustbearing to match?

thanks

-Matt

[Bl4cK32]

os twin. they supplied the correct bearing and carrier to match it to the 25 box.

[brizzi]

hey dude did ya machine the flywheel when ya changed the clutch? I did the same thing a while back.. kept blowing the crappy lashy 20 box. I put a 25 box in and new clutch.. Got lazy, and i didnt bother getting the flywheel machined for the life of that clutch it just slipped and fried every time on boost...

[T04GTR]

is there a small amount of freeplay on the pedal?

if not adjust it so theres about 1cm of pedal flop.(on the pad)

your clutch may be "pumping up"

[huddy]

O K - well had the clutch checked out turns out it was buggered :S now i am running the new xtreme 'drift' clutch with thrustbearing provided, have just done 900km's and its not slipping!!! so this means motor is now run in also

BUT - i was told that once the clutch is worn in the fork will want to move toward the slave moreso :S and that i didnt have enough play in the fork atm (so need a shorter pivot ball) . like i said, just done 900km's and its not slipping... has anyone else heard anything like this?