Jump to content
SAU Community

Helpp

QUICKY

By QUICKY,
in Engines & Forced Induction

 Share

Recommended Posts

QUICKY Community Regular

QUICKY

Posted
Posted

ok guys heres a long story short.

got my car back from the tuners a week ago, was runing superbly, wasnt missing a beat. nyway yesterday im taking the car out of the driveway, i give it a bit of a hit, and once d revs reached around 4000+ it made dis loud screeching noise. so i backed off and geared up. tried it in second gear and same thing. anyway granny shifted for a few minutes tried giving it a hit again, and the noise was gone for the rest of the trip. parked the car at the shops for bout 45mins, and when i got back in it and drove off, it did d same problem for d first 5 mins of driving den disapeared.

i thought maybe its d turbo, however, no loss of oil or any smoke. also if it was the turbo, i assumed d noise would be constant, not leave after 5 mins of driving. anyone got anyyyy ideas what it could be???

Link to comment
https://www.sau.com.au/forums/topic/177594-helpp/
Share on other sites
Leadfoot Enthusiast

Leadfoot

Posted
Posted

If its the stock turbo the turbo bearings are most likely shot.

I had the same thing 6 weeks ago. As soon as the turbo spooled to any decent sort of rotational speed it made a very very loud "screeching" sound.

It happened instantly. No warning at all. I reckon it sounds more like a crowd at the a fireworks display. eg a "wooooooooo" sound.

Volume is also very loud. I thought I ran over a cat the first time it did it and it got jammed under the car.

When I removed the turbo from the vehicle I could feel a bit of roughness in the bearings but not that excessive. Shaft play was also minimal.

The seals were perfect, no smoke, no water or oil loss. The only fault was worn bearings.

As a test you can idle the car with the bonnet open and rev it by pushing on the throttle whilst standing over the turbo. If you hear an unusual roughness and louder than normal whining noise coming from the turbo then thats probably it.

If your lucky it might just be the alternator belt. My turbo was only 70,000kms but it had been boosted at 12psi for about a year. Bearings are a weak point for the stock turbo probably due to the very high rpms of small diameter turbines. Its not an uncommon fault. If you catch it early enough the ceramic fins will still be okay.

Best of luck.

ok guys heres a long story short.

got my car back from the tuners a week ago, was runing superbly, wasnt missing a beat. nyway yesterday im taking the car out of the driveway, i give it a bit of a hit, and once d revs reached around 4000+ it made dis loud screeching noise. so i backed off and geared up. tried it in second gear and same thing. anyway granny shifted for a few minutes tried giving it a hit again, and the noise was gone for the rest of the trip. parked the car at the shops for bout 45mins, and when i got back in it and drove off, it did d same problem for d first 5 mins of driving den disapeared.

i thought maybe its d turbo, however, no loss of oil or any smoke. also if it was the turbo, i assumed d noise would be constant, not leave after 5 mins of driving. anyone got anyyyy ideas what it could be???

Link to comment
https://www.sau.com.au/forums/topic/177594-helpp/#findComment-3242832
Share on other sites
Leadfoot Enthusiast

Leadfoot

Posted
Posted

If you are saying the noise goes away when hot then it could be one of the gearbox bearings or input shaft bearings getting a bit worn.

I have this problem also, however its only when the gearbox and the oil are cold. Cold mornings are the worst.

After 1km down the street its gone.

To test this just rev it up in neutral to 4000 rpm and if the noise does'nt appear (compared to in gear) then that's the problem.

If it is a gearbox bearing I would just ignore it or maybe change the gearbox oil.

Link to comment
https://www.sau.com.au/forums/topic/177594-helpp/#findComment-3242841
Share on other sites
QUICKY Community Regular

QUICKY

Posted
  • Author
Posted (edited)

thanx for d replies guys. will get d belts checked out etc. and i dont think its the gearbox, because the noise can also be heard by reving it hard in neutral before taking it for a drive. im hoping its a belt. and as for mods, i got:

Apexi pFC, bosch 044 pump, z32 afm, 3" turbo back exhaust, arc filter, fmic, hks evc3,

also, if it was the turbos bearing i dont think the noise would go away after a while. think it might be either a belt, or possible throttle related as sumone pointed out. will look into it asap. any more ideas would be appreciated.

thanks guys

Edited by QUICKY
Link to comment
https://www.sau.com.au/forums/topic/177594-helpp/#findComment-3242945
Share on other sites

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


  • Latest Posts

    • Nizzy_R34
      r34's love to squeal

      By Nizzy_R34 · Posted

      just an update to this, poor man pays twice  Tried sanding down the pulleys but it didnt do the trick. Chucked another second hand alternator in the na car which I got for free off my mate and its fixed the squelling. Must have been unlucky with the bearings.    As for my turbo car, I managed to pick up a cwc rb alternator conversion bracket + LS alternator for 250 off marketplace, looked to be in really good nick. Installed it , started the car and its not charging the battery.... ( Im not good with auto elec stuff so im not sure if this was all I needed to do but I verified such by using a multimeter on the battery when the engine was running and I was only getting 12.2v )   I had to modify the earth strap for the new LS alternator , factory earth strap was a 10mm bolt which did not fit the bolt on the LS alternator which was double the size so I cut it off , went to repco bought some ring terminals that fit, crimped it onto the old earth strap and bolted it up to the alternator , started the car and same issue. Ran like shit and was reading 12.2 at the battery.  For a "plug and play" advertised kit thats not very plug and play but alas.  My question is , am I missing something ? Ive been reading that some people recommend upgrading the stock 80 amp alternator fuse to a 140 amp but I dont see how that would stop the alternator charging especially at idle not under load.  Regardless ive pulled it out and am going to get it bench tested by an auto elec tomorrow but it would be handy to know if ive missed something silly or have done something wrong.   
    • Duncan
      Engine sputter

      By Duncan · Posted

      My wild guess is that you have popped off an intake pipe....check all of the hoses between the turbo and the throttle for splits or loose clamps.
    • Duncan
      S1 Autech 260RS Wiring Diagrams

      By Duncan · Posted

      Awesome, thanks for sharing!
    • Duncan
      Nissan fuga 450gt android screen

      By Duncan · Posted

      To provide more specific help, more information is needed. What Android screen? What is its wiring diagram? Does the car's wiring have power at any required BAT and ACC wires, and is the loom's earth good?
    • GTSBoy
      Nissan fuga 450gt android screen

      By GTSBoy · Posted

      So, now all you need to do is connect the 2 or 3x 12v feeds into the unit to permanent 12v, ACC 12V and IGN 12V that you can find in the spot behind the stereo, and the earth, and then it will switch on with the car.
×
×
  • Create New...