Jump to content
SAU Community

Rattling in gearbox clutch disengaged/neutral

Paymh
 Share

Recommended Posts

Paymh Apprentice

Paymh

Posted
Posted
Rattling in gearbox clutch disengaged/neutral

Hey guys so been trying to track this issue for ages. When going over bumps or turning a corner/reversing with the gearing disengaged/clutch partially engaged the gearbox rattles heaps. Can physically feel all the gears rattling inside the gearbox and its real loud.

The cars a r33 gtst with a tight shimmed diff i originally thought it was because of the diff being locked but since it happens going over bumps im not so sure...although its much much worse when reversing while turned.

This issue leads me to the next problem which is a grinding between gears which i first thought to be the syncros but the issue is so much worse if you're mid drift and try to shift it grinds so much worse which i think stems from the above rattling as i pushed the clutch in to shift and the gears bounce all around the joint...

Tranny mount when i bought the car was as loose and worn as an old hooker its since been made solid with polyurethane, all rear bushes replaced cept stock diff bushes, subframe collars, no difference made with those changes. Not sure what it could be. Don't think its engine mounts because its only with clutch disengaged so shouldnt matter..Thoughts lads? Thanks!

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
      RB26DETT Sketchy boost mod?

      By GTSBoy · Posted

      There's restrictor pills in the stock boost control hoses. That's how they set the amount that was bled off and hence the "high" boost setting. The usual mod in the day was to remove it and send the "high" boost setting up to about 14 psi.
    • ARB26
      RB26DETT Sketchy boost mod?

      By ARB26 · Posted

      Thanks Duncan, that's the best info I've read. Furthermore after learning about the PCM programming side controlling the factory boost solenoid, the purpose of the solenoid is to "bleed" boost when pin 25 is earthed, thus allowing spring pressure in the wastegate actuator to overcome diaphragm boost pressure, thus closing or reducing the position of the wastegate flap creating more boost as the turbo is able to spin faster. It's pretty cool to see a designated Pill to do exactly this, would have liked to have seen it with a tiny filter over the end for those moments in vacuum.  The constant bleed pill has now been removed completely from the system and solenoid boost control has been restored once again.   Case closed 😂
    • GTSBoy
      Cas issue

      By GTSBoy · Posted

      The wideband reading is meaningless if it's not running. Why are you using shitty old sidefeeds on any engine, let alone a Neo? What manifold and fuel rail are you using to achieve that? Beyond that, can't help you with AEM stuff as I've never been their ECU/CAS combo.
    • Duncan
      RB26DETT Sketchy boost mod?

      By Duncan · Posted

      Manual boost controllers (where a little of the boost was bled off) were quite common back in the day, because they were cheap and easy. Generally they had a manual adjustment screw rather than being fixed like yours. Down side is they always bleed boost, not just when you want them to so an electronic boost controller that uses a solenoid will have less lag.
    • nash47
      Cas issue

      By nash47 · Posted

      Hello , im new here and i have A31 home build  RB25det neo stock eng / turbo  aem ems 2 blue connector  aem 3.5 map aem cas disk aem wideband connected to ecu  355 lph pump 550 nismo yellow injectors side feed aftermarket regulator  and won’t start with base aem tuner basic tune eventually flipped cas 180 degree so it triggers on correct stroke not in exhaust cycle  Now it won’t start Wideband reads 10 and 11 at lowest fuel setting  and will share calibrations soon for aem tuner i think something is wrong in aem tuner    please if you have any information, am very grateful         
×
×
  • Create New...