Boost Problem??

[tydon]

ok just hooked up boost gauage took car for a drive and it was showing 7-8psi was told external wastegate spring was 14psi. also noticed my BOV doesnt go off on boost. wastgate still opens but not till around 5000rpm. feels almost like lag can also hear a high pitched sound almost like a power drill sound.

could be a leak ?? on idle can feel hot air coming out of he screamer pipe on wastegate.

[tydon]

was thinking of putting a manual boost controler in seeing if it makes a difference.

[Pappu1]

Nothing should be comming out of pipe at idle

Fully sounds like a leak especially with that hi pitch sound

[tydon]

 pappu said:

Nothing should be comming out of pipe at idle

Fully sounds like a leak especially with that hi pitch sound

if i had a leak somewhere would that cause the BOV not to go off. my intake pipe that runs under manifold from podfilter to turbo. the part where the pipe seals onto the turbo has a small split.

wastegate on idle doesnt leak badly just feels like hot air emmiting from the pipe. could be a small leak or just heat waves coming off the extractors??.

i also noticed that the BOV blows back through the podfilter can hear fluttering sounds. almost like the super sequential sound.

[WRXONP]

hahaha

i think your super confused

"fluttering" is not a "super sequential sound"

"fluttering" is compressor surge - that means if your getting that sound the bov is not working - it could be seized- could be too tight - not hooked up among other things

the wastegate should not leak on idle what so ever - if it is then it has a fault - could be a torn diaphram - stuck diaphram

those are 2 different problems

what turbo - engine - engine management are u running ?

a split on the intake pipe will cause a loss of power and would make it run lean as it would be sucking un metered air through the split

[tydon]

 WRXONP said:

hahaha

i think your super confused

"fluttering" is not a "super sequential sound"

"fluttering" is compressor surge - that means if your getting that sound the bov is not working - it could be seized- could be too tight - not hooked up among other things

the wastegate should not leak on idle what so ever - if it is then it has a fault - could be a torn diaphram - stuck diaphram

those are 2 different problems

what turbo - engine - engine management are u running ?

a split on the intake pipe will cause a loss of power and would make it run lean as it would be sucking un metered air through the split

I used aftermarket stainless extractors, split fuel rail mod with greys....., stainless steel turbo upipe with 38mm wastegate and screamer pipe, purple afm , tdo4L with wastegate actuator welded up, 2S ECU

unsure on the bov but it is really big. like coke can size big

[tydon]

well its defintely leaking air right where intake joins onto turbo theres a small rip i put gasket glue on it to try seal it and it just blew a small hole through it.

And i think slightly leaking gases out of the screamer pipe attached to the wastegate checked all the joins for wastegate seems fine.

it opens at 7psi yet has 14psi spring or mayb i was told wrong could have smaller spring in it??

it whistles on acceleration at a certain amount of revs around 3-4thous rpms probably will be the intake leak?

[tydon]

still having boosting problems now its worse and im back to boost cutting the spring in the wastegate is a 14psi spring. im going to change the intake pipe when i get one. been having random boost cuts itl cut at 6psi 8psi and 10psi there are no leaks around the wastegate fixed that. still have a high pitched sound when accelerating. and changed the b.o.v and now it goes off very quitely

[tydon]

Has anyone got an idea why this is happening ive tried changing solenoids. it never used to boost cut and now it does............. HELP

[94 Leone]

Edit:just read whole thread, fix your leak properly.

[tydon]

 94 Leone said:

Edit:just read whole thread, fix your leak properly.

my old solenoid was making ticcking sounds i changed for a v1/2 solenoid but the solenoid has an extra port on the top is there any other plumbing diagrams on forums i found one but only has the 2 port solenoids???

[tydon]

 tydon']

[quote name='94 Leone said:

Edit:just read whole thread, fix your leak properly.

/quote]

my old solenoid was making ticcking sounds i changed for a v1/2 solenoid but the solenoid has an extra port on the top is there any other plumbing diagrams on forums i found one but only has the 2 port solenoids???

also i swaped the solenoid brackets over with another known to be good to test. reset the ecu took it for a drive and it stopped boost cutting. so im thinking the boost solenoid on my old one is stuffed so ive got another boost solenoid from a single turbo wrx it has a red sticker and a port at the top and two down the bottom like my previous solenoid that i reused from my BBOD. ive searched the forums for a solenoid plumbing diagram and havent found one with a port on the top?? and would this solenoid work if pumbed correctly.

i dont have a wastegate actuator on the turbo. im running a seperate external wastegate with a 14 psi spring. im going to fix any leaks before going for another test.

[telemekas]

Subaru 3 port boost controller:

The top solenoid port is the air inlet (which accepts pressure from the turbo compressor),

The middle port is the outlet (which sends a portion of pressure to the wastegate actuator) and the lowest port is the vent (which sends bleed pressure back to the pre-turbo intake system).

[tydon]

 telemekas said:

Subaru 3 port boost controller:

The top solenoid port is the air inlet (which accepts pressure from the turbo compressor),

The middle port is the outlet (which sends a portion of pressure to the wastegate actuator) and the lowest port is the vent (which sends bleed pressure back to the pre-turbo intake system).

cool thanks one more quick question if im using an external wastegate can the top port be blocked off or do i just put in a Tee section from turbo nipple to wastegate and top solenoid nipple??

[telemekas]

YES. ->Put in a Tee section from turbo nipple to wastegate and top solenoid nipple??

[Stoffa]

why oh why an external on a TD04?

[tydon]

 Stoffa said:

why oh why an external on a TD04?

why not lol? love the sound of gate.