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so ever since i brought the car on hot days or when towing i find that the turbo starts to sound like a siren done anyone else have this or is it a problem with my car. but on cold days its not as bad or i dont here it at all..

cheers :)

Is it a whistle like when you let air out of a balloon neck? If so it sounds like a boost leak. Check all your inlet joins

yea its just like a police siren and like i throught it was normal due to the fact i brought it new and has always done it but its just making me think why cos other turbos cars dont make that sound unless on high boost or boosting up... will have a look at it with joins next if any other thoughts or other ppl with same issue let me know if you fixed it or if its normal havent had toyota look at it yet..

By chance on those days do you have your window down and have a snorkel fitted?

no with window up and still dose it no snork just yet only dose it on start up and with driving when acceleratin.. AND ALL SEALS SEEM TO BE TIGHT so not a leak from what i can see

I had my car do it a 100k kms.
It happend on the highway, i thought i was being pulled over by the police it was that loud but it never went away. It ended up being the exhaust wheel on the turbo (damaged Fins).
i have also had a boost leak and they are easly found as oily air will stain the area due to blow by.

mmm guess ill have to book it in at work but then again its warrenty shit so toyota i guess..... thanks for the replys :):)

so abit of an update after 2 months of going back and forth with Toyota it turns out my turbo is faulty and over boosting as i always thought it was i even pointed out where it broke the rocker cover seal and where it was leaking hahaha... they are going to replace it $4,600 later under warranty woot:) will know win about 4 weeks once its arrives... if its fixed. will keep you guys posted as how it goes when its all "fixed"

Hi Guys.
Just though I'd throw this up here to help anyone searching for symptoms in the future.

2016 Hilux - 61000km

A couple of weeks ago my hilux started making a whistle noise like a dentist drill/ siren when under load. It was most evident between 2500 rpm to 3000rpm and was definitely turbo related as it would change pitch and volume directly with changes in throttle position.

There was no noticeable change in performance and no obvious signs like black smoke or the like to indicate anything majorly wrong. It was also an instant change not something that gradually built up.

I checked for things like a leaking or split turbo hose and the intercooler but could find nothing wrong there.

Booked the car into my local dealer and they took some video and audio recording and forwarded them to Toyota. Over the next couple of weeks they needed the car back to try a few different things and get some more info. Finally today I had the car in and they changed the turbo and the noise is gone. The car may have a little more power but I think it's probably more the power of suggestion. I was hoping to get a look at the old turbo but things were pretty hectic when I picked up the ute so I didn't bother trying.
Hope this helps someone in the future

https://m.youtube.com/watch?feature=em- ... 6gvZYXr4D8

Cheers
Mark

Hey Mark, what year and how many K's?

Sorry mate. 2016 with 61000 on it.

I've edited the original post for clarity and added a link to the video

Cheers
Mark

2016 hilux sr5 iv also had a turbo replacement under warranty, sounding like a siren and also had blown rocket cover gasket as they said was over boosting at the time as well.

One of the vanes might have broken off, it's happened to the N70's as well. Interesting noise it has!

i also had a siren like noise on my 2016 sr5 and toyota are replacing the turbo

Had the same noise with a company triton...the siren noise just appeared one day...3 years later and 50000km it's still doing it...no ill effects.

Threads merged

Thanks for the thread lads.
Finished watching the video clip and have the exact same sound. Just hit 41k km. Hope the new turbos a little more robust.