Zero boost not even actuator pressure
 

So a over a while I've been collecting parts for mapping I've got a blob v limited wrx I've had about 3 years

So I first did the fuel pump a while back possibly a year ago now
a month ago I swapped the turbo for a vf48 and I took the car out and did 1 pull to 5k to check it was boosting all was fine

Then it went back in the garage undriven as i added hawk blue injectors, decat down pipe, front mount ( i know not needed but i wanted it) and induction kit due to front mount i then waited till the day of mapping to drive it

Drove off boost like really steady and didnt even try building boost

He started by plugging it in and adjusting thing for the induction kit and injectors (not on rolling road)

He plumbed in the 3 port I'd bought it was a plug and play peirburg device

After this he took it out and came right back saying no boost not even actuator pressure he even tie wrapped the wastegate closed and still the same

Did a boost leak test and held fine

I left To go home with only advice of it probably being turbo has seized or something

The next day I swapped turbo for the td04 I had originally on the car and test drove still no boost nothing at all just gets to zero and feels like a 1.2 🤣

So I've put the vf48 back on and thats where im at

Anyone had this before I'm going to try and get booked in soon with a specialist and the car isn't being driven

Any help would be great thanks steve

Boost pipe blew off on intercooler.

Checked with a boost leak rig and holds fine I'm going to re install top mount though and see if anything changes. Being jdm it has avcs not sure if this matters during base map I'm not clued up enough for that. Could be tgv stuck closed and I'd had the tgv motor off to get the injectors on the driver side out. I know if you remove the sensor it defaults closed and if you don't turn it open to install it locks it closed but not sure if this happens with the motor too ? Anyone know

Check your NPS is working.

If you haven't even actuator pressure there is something very strange going on. Is your inlet pipe collapsing has a rag etc got sucked in to the inlet pipe after the air filter. Possibly your dump valve has failed.

I will try this either today or tomorrow I actually have new 1 from a while ago but I've got romraider can you check it through that?

could be possible but it was fine with that turbo just a few weeks ago. I'd just put the vf48 on and did a boost test to make sure it worked with no leaks and hit 1 bar fine. Then garged a couple of weeks while I fitted front mount, injectors, downpipe and induction kit with pipe

Don't have a dump valve as was going tgoing the adapter to run oem one but ran out of time before the day of mapping if i sort this ill get 1 though

So what have you got blocking the hole where the dump valve should be?

I've got a bung in

So as far as I could tell with romraider the nps is working fine changed from 0 to 1 when in and out of gear

does anyone know if the avcs would activate when revved?

Ive got a slight leak from turbo oil banjo so ive ordered a new 1 so couldnt test drive yet but i hooked romraider up when i was ready to test drive when I noticed the oil leak so only got rev and idle
https://cimg8.ibsrv.net/gimg/www.sco...a3050d40f4.jpg
https://cimg6.ibsrv.net/gimg/www.sco...d3aaf73f71.jpg

Image quality drops when I upload images

Your barking up the wrong tree if you haven't actuator pressure.

by what ?

You've either a large boost leak which you say you haven't an obstruction in the turbo inlet or wheels missing off your turbo but you say you have tried two. You should always get actuator pressure. Who is your mapper and why did you not just take the pipe off the actuator to test for boost cautiously.

He did a boost leak test from inlet pipe and it held fine. I took the turbo off and all felt good no play in shaft and spun free. The td04 I put on after did same boost same feel

He tie wrapped the wastegate shut and didn't change

I've yet to test the pipe of the actuator just waiting on that banjo to arrive with the washers then I'll try a few things like top mount then airbox back on and also the actuator pipe off

I'll keep posting if I find a cure or if it's the engine dead 🤣

taking the pipe off the actuator will be the same result as holding the actuator shut - if one of those isn't making *any* boost the other wont be making any either. If you want a hand logging stuff that's actually useful fire me a message sure. What are your headers like are you sure there's exhaust getting to the wheel to spin the turbo? Even if your AVCS wasn't working, the turbo will still make actuator pressure if its not broken entirely, so you have a turbo not connected to the inlet manifold or you have a turbo not connected to the engine exhaust flow to spin it.

Thanks for your reply bluegod

I wasn't sure if it did the same thing or atleat ruled out the same thing

The exhaust I've changed headers back and forth from equal length to standard cast and up pipe during this problem to try and remedy it with no success

My gaskets are pretty new but would they blow after being swapped about and enough to cause the turbo not to make any boost. Driving me mad as it was till i did injectors and front mount but even then im not sure if it was fine till i drove it to mappers as I stayed off boost. It smells quite rich from the exhaust too. When I drove it I could hear the turbo surge when I let off but wasn't very loud considering I've put a front mount on. Could the front mount be blocked ? It is a used item after all

I will try the top mount and see tomorrow and then if still no joy I'll msg you on what to log on romraider failing that I'll get it to somebody localish that's thatbaru specialist

Could the front mount be blocked ? It is a used item after all

sure why not, did you check it for a dead rat squished into the core - but again it would be tricky to leave you with ZERO boost.

if you want to make some proper logs i'm happy to take a look at them.

Interesting read. Did you get it sorted?

Taking off the hose from boost solenoid to turbo wastegate will give high boost ( careful as stated! ) same as stopping wastegate opening. Cleaning it with carb cleaner will just make it work to normal boost instead of high boost if stuck closed, or lower ( not NO boost ) if stuck open ...

If an intercooler hose has blown off, car would not drive as MAF reading for air flow would be wrong as engine / turbo would be sucking air in elsewhere... and may be barely running at idle speed

Unless a major problem with them there is little to be gained for changing exhaust manifolds, top mount for FMIC etc as long as joints are good and no leaks. Same with injectors.

I guess MAF and MAP sensors are working?

As you fitted a couple of different turbo's it is likely something else, maybe the ECU map? e.g. boost map for aggresiveness, total boost, torque demand and similar?

I've not got rom raider ( I have ECUTek ProEcu to diagnose my own scooby, I am not a a mapper! ) but can you log things like boost solenoid duty, boost max, MAF volts and airflow, Manifold pressure etc to see if there are any differences?


Bottom line, if NO boost then turbo isn't spinning so producing no boost, OR boost is being lost through a leak!