Drive pressure leak

[08lmm72mm]

I've had a slight drive pressure leak that I finally have had time to look into. You can hear the faint 'whine' when the motor isn't up to temp and boost starts to build and goes away when you let off the throttle. Once the motor is up to temp you can barely hear it but it's still there.

I checked around everything with a boroscope and noticed some soot on the drivers side up pipe. Any guess where it's coming from? Being in Canada it takes time to get parts just want to be more sure before i do so.

They are PPE upipes wrapped with Levi's blankets.

 

[ikeG]

Possibly leaking at the downpipe flange, above the soot you are seeing.

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[08lmm72mm]

I thought that also, so I replaced the junk diamond eye DP with one from PPE and it seems to have made 0 difference. I'm going to pressure test the up pipes tomorrow see If I can pin point it.

Has anyone had ARP up pipe bolts break off In the turbo? I had them installed with the up pipes last year and am considering doing it myself just worried about busting a bolt.

 

[gmduramax]

I thought that also, so I replaced the junk diamond eye DP with one from PPE and it seems to have made 0 difference. I'm going to pressure test the up pipes tomorrow see If I can pin point it.

Has anyone had ARP up pipe bolts break off In the turbo? I had them installed with the up pipes last year and am considering doing it myself just worried about busting a bolt.

Haven’t used anything but factory but if you are concerned just get them hot with a torch and they’ll come out like butter.

 

[08lmm72mm]

I duct tape a shop vac hose into my tailpipe with it on the blow setting and sprayed soapy water on my up pipes at the turbo. Worked perfect!

 

[TheBac]

Good idea! Now the fun part......

 

[08lmm72mm]

Oh I know haha. I'm going to try and tighten them up first see if I get lucky.

 

[1FastBrick]

Ain't that something... I wouldnt have guessed that.

Maybe you will get lucky and the bolts backed out.

 

[Bdsankey]

GM gasket with copper spray gasket maker and it'll be good as new (as long as the flange is flat).