HDi Boost Controller

[Guest]

Hey everyone,

ive got a HDi SBC TYPE-D SUBARU Electronic Boost Controller.

its been working fine on the internal wastegate but ive put an external on now and i am having trouble getting it to work with the external. its just free boosting.

ive taken the vacuum line off the internal wastegate and extended it to the side feed of the external wastegate and no go...

im a bit stuck for idea's as i cant see how pushing the external open is any different to pushing the internal wastegate open?

[Guest boostcut]

have you got the vac line on the correct side of the diaphragm of the external., ie not ontop. on the side port

[Guest]

yup vacuum line is plumbed into the side feed of the external, not the top

[Guest boostcut]

is the valve seized in the external? or diaphragm damaged?

[Guest]

it shouldn't be, its a brand new 38mm tial mv-s

[Guest boostcut]

oh, well i cant help you any more.

[Guest boostcut]

actually, tryed the vac line in the top? or is the external bolted up correctly? as the way the valve opens depicts the way the line is connected

[Guest]

as far as im aware the wastegate is bolted up properly, ive done them before on preveous cars and they worked fine.

i have not tried the vacuum line on the top but that is for generic boost controllers isnt it? the HDi subaru boost controller uses the factory boost control system through the ecu

[Guest boostcut]

oh ok. i dont know then. keen to find out what it is tho.

[Guest]

so am i, im using the smaller vacuum line (standard size) and its a bit of a stretch over the tial fittings but im sure enough air will b able to get in to open valve?

[marc]

might sound stupd at frist but the MVS tials come with several ports to screw your boost fitting into in the side (for bottom of diaphram) and then come with several hex key bungs.. U installed the bungs in the ports not being used on the bottom section of the gate ae???? or yr boost will be goen str8 bak out again resulting in free boost or there abouts lol. thats my 5 cents if none of the above is wrong with yr gate (doubt cus its new) or yr boost controller hasnt magicly shat itself or split boost line to the gate/from pressure source.

[Guest]

yeah all the bungs have been used, there is 2 threaded fittings that i am unsure what they are for?

around the bottom it has one bung, one male fitting for the vacuum line and 2 more threaded fittings? unsure what these are for

[marc]

they are most likely more ports for selection of where u wanted to locate your boost in line. U should have gotten mor then one bug with yr gate?? I havet got photographic memory but from the few MVS gates ive done ALLL the bottom ports bar ONE that yr hose fitting goes into lol. would say post up a pic or two but thats prol a mish?? but from the above u should be able to check and sort it. Or even just put a hose onto that bottom hose fitting and then blow into it and see if it leaks back out thoes threaded ports left down the bottom. 5 min job

[Guest]

yeah ill have a look 2moro, 2 cold and wet atm

[marc]

haha all good, im sure it will all fall into place when you look at it .

[Guest]

yeah just had a look and u are right, i moved the fitting off the top (in a hurry to get it done) and put it on the side so it bleeding all of the air out.

will swap around 2moro and see how she goes when i weld up screamer pipe and stuff. it went very well on 28psi though..

[marc]

 2SLO50 said:

yeah just had a look and u are right, i moved the fitting off the top (in a hurry to get it done) and put it on the side so it bleeding all of the air out.

will swap around 2moro and see how she goes. it went very well on 28psi though..

Haha all gud man, always fun tryna fix shit without seeing it lol. Yea let me know lol and I bet 28 went well lol!! (poor motor

[Guest]

ryt, went outside and used a bit of vacuum line with a screw jammed in it to block off the open port. shes all go.. and very loud

[Guest boostcut]

mint! i think i can hear it from here.

[Guest]

needs a heavier spring though, lowest boost i can set is 18psi. whats standard wastegate pressure for v4 sti?

[marc]

 2SLO50 said:

needs a heavier spring though, lowest boost i can set is 18psi. whats standard wastegate pressure for v4 sti?

Thru the factory controller and all is 1.1bar so 16psi

[marc]

 2SLO50 said:

needs a heavier lighter spring though, lowest boost i can set is 18psi. whats standard wastegate pressure for v4 sti?

So nothing is on the top of yr gate and it can breathe ae? tha box should say the spring pressure on the side? have a look then u know to blame the spring or look at other posible causes.

[Guest Bemrose]

jeepers, it should come with 9 pounder?

did you weld your internal closed?

[Guest boostcut]

dont weld the internal gate closed. get a big spring or make a bracket to hold it closed.

[Guest Bemrose]

just take the arm, easy grind off later