Jump to content
SAU Community

R32 Clutch Issue, Rb25 Gearbox Rb20 Motor

sean133
 Share

Recommended Posts

sean133 Proficient

sean133

Posted
Posted

Got a clutch engaging issue lads

Installed a good condition rb25 box that came out a car I wrecked

Basically got it done and car could be put into all gears but it wouldn't move

Sussed it out to be a stuck slave cylinder so replaced that with new oem item (everything seemed to lead to this)

Because we took the slave out, fiddled with the pin and put it back in and the car would drive as it should for like 10 seconds then get stuck again

So I bought a new slave but it didn't fix the issue ....

We put the rear on jack stands and took the slave off and the wheels spun in first as they should, speeding up with the revs of the car going up

Clutch slave back on and it'd do the same

On the ground the car would move when you put it in gear, but when foot went on the throttle nothing happened

At 4000ish rpm the car kinda moved a bit which seems like the clutch is slipping

But I drove with this clutch before the box change, and it had plenty of meat left otherwise I would have replaced it

New oem slave, new gktech braided clutch line, bled properly.

Fiddled with the adjustment on the clutch pedal but it didn't change anything

I understand that many people will just say " clutch is gone"

But how?

Basically the issue seems to be either the clutch is slipping which I don't believe

Or the clutch fork isn't retracting properly ,

Is there a way the thrust bearing or carrier could not be going right back in ? Leaving the clutch still engaged a tiny bit so it won't go into gear fully?

Could pivot ball be affecting this?

Could it be a spigot bush issue?

It has a new thrust bearing, pivot ball was good, and the fork wasn't cracked, and I checked it moved nicely and as it should before the box went in.

Appreciate all help and constructive criticism or let me know if I should try something to diagnose further

Thanks guys

And yes I can just pull the box out but id like to diagnose as much as possible before I do it in case I don't need to.

Because I'd like to do drift prac on Saturday

sean133 Proficient

sean133

Posted
  • Author
Posted

I could smell something burning

It all leads to a slipping clutch I suppose

Only theory I could come up with is when the slave was seized and wouldn't fully engage the Clutch before , the clutch was basically worn down to nothing because of it, which kind of makes sense

sean133 Proficient

sean133

Posted
  • Author
Posted

For anyone wondering, the pivot ball in the rb25 gearbox was too long

Which is very weird because most people seem to just bolt the box up to a rb20 easy

Pivot ball being too long burnt the clutch out hence the smelling/slipping

Got a gktech sr20 one in there now just need to bolt it up and test it out , could possibly still be wrong just need to trial and error

blind_elk Grand Master

blind_elk

Posted
Posted

No trial and error about it. A few measurements - clutch height, throw-out bearing offset, and a couple of others - and you should be able to tell whether it all fits together correctly.

sean133 Proficient

sean133

Posted
  • Author
Posted

Could figure out where the clutch sits inside the box by measuring then figure out where the face of the bearing will sit at the furthest point the pressure plate is inside the box , then if the fork angle is ok after setting it up I'll know it will work

Just weird it ever happened, no one else seems to have had the issue

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • GTSBoy
      Boost cut after swap(RB25DET NEO) R34

      By GTSBoy · Posted

      Don't even try to run it on the stock ECU if you're going to have the boost controller bring boost above ~10 psi. I've already told you that. If you use the Nistune ECU, you will need to CAREFULLY read the available documentation for Neo tuning, and read some threads on the Nistune forums, to discover the various things you have to do to prevent the ECU from going bananas when the boost is too high. The is a table associated with th boost sensor that must be modified to prevent it from shitting the bed. This is just one of the things that you will need to do to the tune in Nistune, because the Neo turbo ECU will be expecting to see a number of things (such as the TCS) that are not there, and you have to block the DTCs on those. It is totally not surprising to me that you are having the problems that you are, but the solutions to these problems have been known for >15 years. So just get it done.
    • dyl33
      VOLK RACING GTC CENTRE CAPS

      By dyl33 · Posted

      Centre caps $250
    • Kapr
      Boost cut after swap(RB25DET NEO) R34

      By Kapr · Posted

      Hi. Sry iam not a mechanic and iam not at the car atm so i dont know 100% but they told they measure those and even try to change those. AFM they have two. Coils are new a they have my old one too. Plugs too. ECU...we have 25 NEO stock and Nistune 25 NEO.   But i dont know if any one those could be the problem and why/if/what can cause this, Only thing they did not check is fuel...but that walbro 255 is new(like 1,5 years)... That fuel pressure gauge idk...but i let them know Any suggestions?   EDIT: how can they know if it is like you say he ECU pull power when it reaches a specific boost level that is too high? Tha car has boost controler
    • Duncan
      Boost cut after swap(RB25DET NEO) R34

      By Duncan · Posted

      Can you clarify what you mean by boost cut, do you mean it misfires both when under load (driving) and when stationary and out of gear? Or does the ECU pull power when it reaches a specific boost level that is too high (boost control issue)? Does it occur at idle with no throttle? When you say "the ECU is OK", what ECU is it and why do you think it is OK? Have you used the NEO ECU, and if so do you have a MAP sensor attached? Same for the AFM, why do you think it is OK? Do you have any way to put a fuel pressure gauge on it (even just a mechanical one between the fuel filter and fuel rail)?
    • Kapr
      Boost cut after swap(RB25DET NEO) R34

      By Kapr · Posted

      Hi.. Just another problem. So maybe you can help. I(my mechanic) done swap from my RB20DE NEO to RB25DET NEO. Everything is OK but we have a boost cut. Coils/Plugs are ok...AFM is ok. ECU is ok. I have Walbro 255 but it "changed" sound few months ago(you can hear it ouside) you did not hear that when it was new(maybe faulty?) Sooo...what now? What can cause this boost cut? It is even when you standing still...
×
×
  • Create New...