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

    • Sounds more like what Brad said, that it's mainly transfer. What pad bed in procedure did you use, and did you replace/machine the rotors, or just swap pads?
    • The stutter is almost entirely in the pedal. I don't feel the brakes release and reapply as you would with ABS engaging but the pedal feels that way, without the brakes releasing. It only lasts for less than a second and the pedal is fine again. It's hard to explain, sorry.  I'll get under this weekend and just double check everything is tight. Fluid is at max where I left it.
    • What bedding in procedure did you use?   When you say stutter, what exactly do you mean? Like it feels like someone letting go of the brakes momentarily and regrabbing them again to get you to stop? Re-reading your post, and that is what it kind of makes me think you're explaining, like theres a little bit of a jolt, likely just as you're reaching a stop. I've only had this issue once. And if its caused by what caused mine, you will want to get the car up on stands again and check it over. Mine was a case of a caliper mounting bolt coming out and letting the caliper rotate on the other remaining bolt and gave play in a wheel as it came to a stop. But not every stop either!
    • Yeop... binned it   This will be a summary will not many pics atm and cbf  Fixed the samsonas - it was totally munched Put a new precision 7675 T4 on with proper split pulse mani Got to Sydney to get to car - drove to canberra to get racecar - drive back to sydney that night Next day all day at Plasmaman putting on new clamps cleaning some things up and adding another large engine oil cooler sitting at the rear above diffuser to keep things cooler Next day - Tuesday - on Dyno - killer wikid awesome pumped out really good numbers - more mid range and on lower boost levels Wednesday - first prac - all day again getting the suspension right - had to borrow front suspension again - out do a lap come in - out do a lap - in - what i had just couldnt handle the load at the more consistent higher speeds - got a lap in at the end of the day that was pretty reasonable  Put it this way that lap wouldve had me in 4th in Pro am for the whole event - with only 700 hp and used tyres Thurs first official prac day - lap out warm up - then entered a hotlap with above setting and 80% effort took corners 1,2,3 and into 4 car felt awesome -  rear came around out of nowhere bang into the wall near front on at whatever 140 kmph Done, over, gone Just one of those how did that happen apparently as all indications show nothing out of the ordinary Got to spend the rest of the time at the event like I hadnt done before - was actually Ok mainly as I had my family and my boy is 9 and got treated like a rockstar Long trip home, lost a trailer wheel in nowhere land, X5 airbag suspension gave up half way across nullabour and rode on bumps stops (its now completely fine) had to do a 19 hr drive day on day 3 as accommodation got screwed up so just had to keep driving till found a town with some Now to reassess - hopefully the motor and other things are OK but yet to be seen too. There is no easy fix there is no i'll just order that part and get it sent - we'll have a talk to people see what can happen and what the go is but at minimum its rebuild from scratch struts forward and alot of time effort and $ should and if I return and if but maybe/ when  I have the cage tied into the front strut towers - if I didnt have that things couldnt been worse you can say its just a front end but if you know what goes into these cars... you'll know what that actually means in reality   Car was very fast. Disappointing we just didnt get to show it Effort doesnt win you races though     Apparently this is motorsport !  
    • Thanks, will do that.  Thankfully they still feel great.
×
×
  • Create New...