Jump to content
SAU Community

Recommended Posts

My turbo is screaming when it reaches the set boost level.

Makes normal spool up sound while getting there but makes a horrible sound on full boost.

I've varied boost from 10psi to 18psi and the sound is only there when it has reached this level.

Power has not been lost, oil pressure/level and quality are good.

A local workshop suggested that the shaft bearing may be loose or worn and the exhaust wheel is touching the housing????? Either that or it's a blockage in the oil feed line and the noise is from the bearings running dry.

To anyone with knowledge does that sound right or should my turbo have blown up by now???

Could it be something to do with air getting in or out of somewhere it aint supposed to?

The Turbo is an old HKS T3G with an internal wastegate.

Link to comment
https://www.sau.com.au/forums/topic/15227-screaming-on-boost/
Share on other sites

yeah happened to me and it ended up losing boost and the flow out the end stopped.

i just high flowed the trurbo and it works fine now

but there was not much movment inside the turbo and it looked fine from outside.

but get it looked at and rebuilt.... but do it before u start losing boost. cos it wil happen if the same prob as mine

at first it would only happen at high boost but then slowly worked it way down and then boost would come down with it.

cheers

Thanks to all for your replies.

Doesn't sound good. This may be the start of some serious rebuilding.

It's definately not a belt. Time to rip the Turbo off I guess. Maybe I'll find out now what a HKS T3G is. I now it's been good for over 200 rwkw so a bit of rebuilding might see more.

Cheers fellas

Could it be your exhaust manifold. Mine schreeches at 6,000 rpm (not bad) just noisy. The guy's said some manifolds come lose after time, so the air escapes and makes that noise.

It might not be the problem, but it's one to keep in mind....

Cheers

Loz

Lozza150's right on the ball. The screaming noise you're hearing is air escaping from between either the exhaust manifold and the block or the exhaust manifold and the turbo. My car did the same thing, you'll probably need to unbolt it, replace the gasket and re-bolt it back up.

Cheers,

matt

Adam,

Yeah but his car doesn't seem to have any problems making boost, which would indicate that there isn't any damage to the turbo...

I've had a busted thrust bearing on a different turbo which caused the compressor wheel to grind itself into the housing... This didn't even make any noise, the car just wouldn't make the same amount of boost!

matt

I agree that it sounds like an exhaust gas leak, a friends VL turbo made a similar noise, he took it to a so called turbo mechanic who said it's rebuild time, before that he thought he'd check it over himself and discovered that the bolts from the turbo to the manifold were loose, I believe the turbo shop would have thought that all along and would have recieved $800+ for simply tightening a few bolts.

the worst part is most of the cost is to take off all the bits to get to the manifold.... you may as well Hi flow or rebuild the turbo while it's off.

Well that's what I'd do... Hence why i'm not going to fix the exhaust leak till i can afford to hi flow the stock turbo...or fit a HKS gt2540.... (Yeah right)

Loz

Cheers again for your replies. I believe it is more along the lines of a gasket leak too.

I'll have a good look Saturday and post back what I find for any other people curious.

By the way my Turbo aint stock and I don't think HKS would approve of someone going to their handy work with an air grinder.

A rebuild maybe, but if it comes off I'm hoping it can go straight back on again.

I'm getting really toey running around town without letting it build any boost.

The slightest hint of waistgate chatter is enough to get me going. ch ch ch ch ch to to tooo.

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


  • Similar Content

  • Latest Posts

    • Hi, is the HKS  Tower Bar still available ? negotiable ? 🤔
    • From there, it is really just test and assemble. Plug the adapter cables from the unit into the back of the screen, then the other side to the car harness. Don't forget all the other plugs too! Run the cables behind the unit and screw it back into place (4 screws) and you should now have 3 cables to run from the top screen to the android unit. I ran them along the DS of the other AV units in the gap between their backets and the console, and used some corrugated tubing on the sharp edges of the bracket so the wires were safe. Plug the centre console and lower screen in temporarily and turn the car to ACC, the AV should fire up as normal. Hold the back button for 3 sec and Android should appear on the top screen. You need to set the input to Aux for audio (more on that later). I put the unit under the AC duct in the centre console, with the wifi antenna on top of the AC duct near the shifter, the bluetooth antenna on the AC duct under the centre console The GPS unit on top of the DS to AC duct; they all seem to work OK there are are out of the way. Neat cable routing is a pain. For the drive recorder I mounted it near the rear view mirror and run the cable in the headlining, across the a pillar and then down the inside of the a pillar seal to the DS lower dash. From there it goes across and to one USB input for the unit. The second USB input is attached to the ECUtec OBD dongle and the 3rd goes to the USB bulkhead connected I added in the centre console. This is how the centre console looks "tidied" up Note I didn't install the provided speaker, didn't use the 2.5mm IPod in line or the piggyback loom for the Ipod or change any DIP switches; they seem to only be required if you need to use the Ipod input rather than the AUX input. That's it, install done, I'll follow up with a separate post on how the unit works, but in summary it retains all factory functions and inputs (so I still use my phone to the car for calls), reverse still works like factory etc.
    • Place the new daughterboard in the case and mount it using the 3 small black rivets provided, and reconnect the 3 factory ribbon cables to the new board Then, use the 3 piggyback cables from the daughterboard into the factory board on top (there are stand offs in the case to keep them apart. and remember to reconnect the antenna and rear cover fan wires. 1 screw to hold the motherboard in place. Before closing the case, make a hole in the sticker covering a hole in the case and run the cable for the android unit into the plug there. The video forgot this step, so did I, so will you probably. Then redo the 4 screws on back, 2 each top and bottom, 3 each side and put the 2 brackets back on.....all ready to go and not that tricky really.      
    • Onto the android unit. You need to remove the top screen because there is a daughterboard to put inside the case. Each side vent pops out from clips; start at the bottom and carefully remove upwards (use a trim remover tool to avoid breaking anything). Then the lower screen and controls come out, 4 screws, a couple of clips (including 3 flimsy ones at the top) and 3 plugs on the rear. Then the upper screen, 4 screws and a bunch of plugs and she is out. From there, remove the mounting brackets (2 screws each), 4 screws on the rear, 2 screws top and bottom and 3 screws holding in the small plates on each side. When you remove the back cover (tight fit), watch out for the power cable for the fan, I removed it so I could put the back aside. The mainboard is held in by 1 screw in the middle, 1 aerial at the top and 3 ribbon cables. If you've ever done any laptop stuff the ribbon cables are OK to work with, just pop up the retainer and they slide out. If you are not familiar just grab a 12 year old from an iphone factory, they will know how it works The case should now look like this:
    • Switching the console was tricky. First there were 6 screws to remove, and also the little adapter loom and its screws had to come out. Also don't forget to remove the 2 screws holding the central locking receiver. Then there are 4 clips on either side....these were very tight in this case and needed careful persuading with a long flat screw driver....some force required but not enough to break them...this was probably the fiddliest part of the whole job. In my case I needed both the wiring loom and the central locking receiver module to swap across to the new one. That was it for the console, so "assembly is the reverse of disassembly"
×
×
  • Create New...