SOLVED Fun Boost Leak Lets See Who's Clever

[Subwoofer]

EDIT : CHRA was loose. I noticed some brand new oil on the rear coolant drain line, so I investigated the VBAND clamp. Ended up being loose.

Hello again all, been speaking to lots of people about this and to no avail, yet.

Current situation, new 19T get to boost target and then fall off around 5000 RPM (as seen in log below)

I would like to add, I have VTT aluminium outlets with the stock intercooler connection (not stock intercooler)

Things I have done :

Tightened and new seals inside of outlet (Including gasket sealer to help)

New Rear inlet as we were under the impression it had collapsed.

All new vacuum lines.

New PIERBURG Boost solenoid x 2.

2 x Diverter valve o rings.

Taken Chargepipe off and cleaned o ring ( no nicks) put back on.

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Has anyone had a similar issue to this before ?

 

[SLOWESTN54]

Any weird Noises, Have you checked for shaft play ?

 

[Subwoofer]

Any weird Noises, Have you checked for shaft play ?

No weird noises. Shaft play is non existent. Brand new turbos. Also tested wastegate yesterday and they are fine (whilst I had downpipes off)

 

[SLOWESTN54]

No weird noises. Shaft play is non existent. Brand new turbos. Also tested wastegate yesterday and they are fine (whilst I had downpipes off)

Are you missing the screws in the chargepipe by any chance.

 

[Subwoofer]

Are you missing the screws in the chargepipe by any chance.

Screws in the chargepipe ?

I thought it was only a clamp to lower charge pipe. And then a seal + clip onto throttle body ?

I know it screws onto the chassis or whatever it is near the lower chargepipe, via a T30 I believe

 

[SLOWESTN54]

Are you using a stock chargepipe? if not there's always 2 npt plugs in the chragepipe.

 

[Subwoofer]

Are you using a stock chargepipe? if not there's always 2 npt plugs in the chragepipe.

Stock pipe yep. As I’m 07 I believe they were stronger from when it was changed in 2008

 

[SLOWESTN54]

Stock pipe yep. As I’m 07 I believe they were stronger from when it was changed in 2008

I'd strongly recommend checking it for cracks or tears in the boot. Your wgdc seems high throughout the log.

 

[Subwoofer]

I'd strongly recommend checking it for cracks or tears in the boot. Your wgdc seems high throughout the log.

You mean in the boot of the chargepipe right ? I do remember when I took it off it felt very flimsy…

 

[SLOWESTN54]

You mean in the boot of the chargepipe right ? I do remember when I took it off it felt very flimsy…

Yes the rubber boot on the chargepipe. Also are you using a stock airbox?

 

[Subwoofer]

Yes the rubber boot on the chargepipe. Also are you using a stock airbox?

Yes still stock airbox. Air filter is about 10K miles (I normally change every other service) as I drive 30k miles a year so 6000 for oil and oil filter then air and cabin every other.

 

[SLOWESTN54]

Yes still stock airbox. Air filter is about 10K miles (I normally change every other service) as I drive 30k miles a year so 6000 for oil and oil filter then air and cabin every other.

The factory airbox is probably your restriction, maybe try running dual cone intakes with a aftermarket charge pipe of choice.

 

[Subwoofer]

The factory airbox is probably your restriction, maybe try running dual cone intakes with a aftermarket charge pipe of choice.

You think. It’s never been an issue I was running 25 PSI no worries on 17T with stock airbox

 

[SLOWESTN54]

You think. It’s never been an issue I was running 25 PSI no worries on 17T with stock airbox

I think there was a thread here were a guy was having issues with a stock airbox but he had 19t's

 

[langsbr]

I think this is tune related. Are you running an OTS map? You have huge throttle closures when you are maintaining boost target, then it opens fully when it doesn't reach boost target.

 

[iminhell1]

Too many stock parts and that is your restriction. I'm not sure if you're trolling or just daft.

 

[Subwoofer]

I think there was a thread here were a guy was having issues with a stock airbox but he had 19t's

Yeah I have 19T’s now. Just put in about 400 miles ago

 

[Subwoofer]

I think this is tune related. Are you running an OTS map? You have huge throttle closures when you are maintaining boost target, then it opens fully when it doesn't reach boost target.

I’m actually custom tuned, but using 17T map to get logs to change to 19T.

But obviously every time I do a log this happens, tuner also thinks it’s a boost leak

 

[Subwoofer]

Too many stock parts and that is your restriction. I'm not sure if you're trolling or just daft.

Just because the part is stock doesn’t mean I’m daft

I was running identical setup before I switched to 19T and never had problems. Until they blew. I’d imagine it’s a seal

 

[wheela]

What tmap sensor are you running? As somebody previously noted, there is a big throttle closure matching the duration of your boost plateau. This closure is because load actual hit load target. My suspicion is that boost plateau is actually a huge boost spike, only it's showing as flat in you log because your actual boost is much higher than your tmap can read. Your load also plateaus in the same region, but I think that's due the the throttle closure preventing load from over-shooting load target due to the huge boost spike that is erroneously showing up as a boost plateau in your log. If this is true, then where your boost drops back down after the plateau, is probably just boost coming back down from the spike back into a readable range for your tmap sensor.