Picked up a bit of a sucking/wooshing at full boost

[st3ph3n]

Driving home tonight on the motorway. Slow car passing a bus so dropped down the gears into third and when it was clear I booted it. When the boost started peaking I was getting a bit of a sucking noise that sounded like it was coming from down towards the wheel arch on the passenger side. There in 4th too, but only on boost. Not enough road to really give it the full treatment in 5th.

Stopped in at harthill and checked for any visual signs in the engine bay and around the car but couldn't see anything wrong. Reset the peaks on the R-Vit and gave it a run. Thought it might have been boost leak but peak boost is as normal, intake temps look normal for a warm day too. Drives perfick etc.

Any thoughts?

[st3ph3n]

C'mon you useless eejits. This is a genuine question. The noise is still there.

I'm certainly no expert, but it sounds like the noise starts when I imagine the wastegate would be opening.

Anyone got any thoughts, even some abuse to let me know I'm alive perhaps?

[oobster]

Might be just a wee split in a hose somewhere stephen?

I know what you mean - 66 views and no replies

[st3ph3n]

It could be. I'll maybe get it across to Milngavie to get them to have a look on Monday if no one has any ideas.

It could just be my imagination of course.

[oobster]

Apologies in advance here, but have you checked the nearside windows are tight shut?

I know, i know, stating the bleeding obvious but sometimes the mind can go into overdrive and the simple things are missed. I've done it myself.

[st3ph3n]

First thing I do when I get in the car is crack the windows open a bit. I did close them when I thought I heard the noise at first, and when I stopped at harthill I made sure all the doors were shut too.

If it was speed related then it'd certainly be a windows/panels/wing mirrors issue, but it is definitely related to revs/boost as I get it in all gears.

[darryl_martin]

How loud is it? Just wondering if it's exhaust related. I managed to blow the baffles in my back box (or I thought I had, any excuse for....) so fitted a new exhaust. Sounded a bit like a tearing sound, again only happened under heavy acceleration on boost. Was told it may be the wastegate but a new zorst fixed it. Now have a new car and have just fitted a decat centre and am now getting a very slight version of the same thing.

[st3ph3n]

Reasonably loud. The exhaust is standard except the backbox which is the h+s jap slash one which is fairly loud anyway. It does sound a bit like tearing. Like a very amplified road noise too.

I'm thinking it's got to be exhuast related

[rabskyline]

this would happen if the hose popped off the intercooler slightly and is only slightly leaking but under load. check all the jubilees and work your way round !

[johnnyr6]

Sounds like an air leak somewhere. Are you still getting full boost? Your resonator box is in the o/s wing, this helps quieten things down but if it's came loose it could give you a sucking sound from the induction side.

[st3ph3n]

I reset my r-vit a good few times. It reads the data from the ECU and it was still peaking at the same values as ever - 1.1 bar or there abouts. Intake temps were pretty constant in the high 60s in farenheit. All other numbers looked standard.

If I get time to go to Milngavie in the morning I will, if not I'll go on Monday.

[Croc]

could it be the jubilee clip on the hose?  somehitng similar happened to me and turns out that when the garage had replaced a faulty air valve.  worth checking it out anyway.