Strange *bawwwp* Sound Under Boost

[HtwCHACtkh]

Hey guys,

I'm getting this really weird *bauuuuwwpp* like sound in first and second gears when under boost and wide open throttle, it's pretty damn loud it over rides the sound of the induction and engine noise.. It tends to get quieter if I keep driving hard.. What could it be? At first I thought it sounded very electronic more than a whistle of any sort!

Car is R33 GTS-T, Current Mods: FMIC, POD, 7lbs boost using grounded solenoid.

I notice I don't get the noise at all if I leave the boost at 4lbs (just leaving the solenoid circuit open)

I'm thinking boost leak, but it's not consistent through the gears and boost levels.. =/ Car seems to drive okay.

Belts maybe?

[Greekos]

you have a leak, any i reckon that leak is coming from either a your exhaust manifold, or flange gasket on the turbo has failed forgot the exact name. that noise is caused by either snapped exhaust studs which is common or the bolts that hold your turbo to the manifold have come loose causing the gasket to fail.

now if its not that you have a leak somewhere between your turbo and intake.

[HtwCHACtkh]

That sounds bad, should I stop driving?

Where should I head down to get it fixed?

[HtwCHACtkh]

bumpizzles allowed?

[mad082]

it isn't coming from the rear tyres? LOL

[HtwCHACtkh]

it isn't coming from the rear tyres? LOL

Definitely from the front of the car mate.

[mad082]

is it a deep noise or a high pitch squeal like a belt slipping?

maybe it is your engine moving on the mounts due to the sudden twist when acclerating and it's cracked the exhaust or the exhaust is a bit loost and the noise is exhaust noise and as things get hotter the metal expands and closes the gap a bit