Hi , 1994 Subaru WRX jap import
Td05 , de cat pipe , hks air filter
3' straight through exhaust blitz
New age coil packs conversion

Main issue car is overboosting in third and fourth dare not push any harder. Boosting upto 20psi with foot to floor then fuel cut if I don't floor it not as bad . Any help would be appreciated thanks .

 

Proper boost control required.
How is boost currently controlled?

 

Guessing its not been mapped for the mods?

 

It isn't controlled . Bought the car like that . It was all to hell , new age conversion and the car had been great until now the overboost problem .

 

Not that I know of . Considering apexi and Andy Forrest

 

As above,needs mapping really for those mods. It must have a MBC on it to get the boost to 1.3bar or wrong/missing restrictor pill or split pipes. 94 classic has map sensor rated to around 1.3bar so will fuel cut.

 

As I've ran the car it has sounded so bloody loud
Gonna check boost solenoid tomorrow . Then off for mapping next month.

 

you could try running the vac line from the compressor nipple to teh wastegate directly. You'll be down to just spring pressure but at least you'll be further from fuel cut. Then simply reconnect the solenoid pipes when your getting the car mapped.

 

So there is no boost control on the car at all? No actuator, no wastegate, no boost solenoid or MBC? I'd start looking at this

 

It does not have manual boost control . Sorry

 

I had an issue, similar to this. Turned oh to be plugs

 

Screw the boost down then dude

 

How ?

 

Just use a short hose going direct from the turbo nipple to the wastegate nipple, no BCS connected. You'll get spring pressure only which should only be around 10psi or so (double check with your boost gauge).

 

Affirmative.
Or screw the MBC down (open more)

 

There are 3 pipes the one from the boost gauge , the one from bcs to airflow meter and one from the waste gate to the bcs . There is not one going from turbo . Help

 

take a picture it will help to explain what you have.

You will have either a 2port or a 3port solenoid.
3 port will be:
be pipe from compressor nipple to BCS
pipe from wastegate nipple to BCS
pipe from intake to BCS

2 port will be:
pipe from turbo nipple to wastegate nipple with a T piece in it.
T pipe goes to BCS.
BCS hooked up to intake on it's second port.


Whichever you have, unhook it and hook one of your now unused pipes from the turbo compressor nipple directly to the turbo wastegate nipple.

 

Found split hose on turbo nipple ghanks

 

Sack that did not work still happening wth new pipe .

 

Does it drive ok if you plug direct from turbo to wastegate nipple?

 

Yes ! 10psi as you said . What do you think ?

 

Did you put the pill back in on the turbo nipple pipe, I know how your feeling I had a overboost problem I was hunting down for ages changed all the inlet pipe vac hoses manifold gasket cleaned bcs, one of the fixed it,, are your vac pipes rock solid mine were and assumed there may of been cracks in couldn't spot as they were brittle, change it all for silicone

 

All pipes are fine I don't see any pill in pipe the previous pipe had a piece of copper in it but I think that was just a repair job .all are silicone too one had a hole in replaced it still the same . I know the car needs a remap but it used to boost just fine until other day

 

That's the restrictor pill mate,needs to be in or you will get overboost

 

Still overboosting with pill in

 

Is it a 2 port or 3 port solenoid then, the pill goes in a different place for each. 2 port with no pill will under boost. 3 port with no pill will overshoot. Definitely hooked the pipes all back Into the right place yeah? 3 port hooked up the wrong way will also overshoot.

 

Get a couple of pictures of the boost control area and the vac pipes and turbo end

 

3 port mate , followed diagram all seems to be right . As I said car was running fine before till other day
Thanks

 

Will tomorrow mate appreciate

 

Should the bcs click repeatedly when I plug green plugs together ?