Hi peeps just fitted a boost gauge to my 95 wagon wrx with td05 turbo and z4 ecu afterburner exhaust and I'm only getting 0.5 bar of boost with theses sort of mods shouldn't it be more ,, or is there a problem somewhere

Any ideas guys y this is ? :-)

 

Yes it should be more mate, 0.5 bar is the turbo running on wastegate pressure alone, double check your servo air pipework between the turbo, the actuator and the solenoid on the wing, do you know if you are you running a 2 or 3 port boost solenoid? you can also check to see if your solenoid is working by connecting the x2 2pin green plugs under the dash, with the plugs connected you should hear the solenoid click rapidly, also the rad fans and fuel pump will pulse on and off this is normal. With the solenoid clicking try to blow through the pipe that comes from the turbo outlet using lung power you should be able to blow through the solenoid but feel the pulses as it opens and closes, if not give it a blow through with some carb cleaner or a blast of wd40, they are quite prone to clogging up with oil deposits picked up via the engines breather system. If this is ok then it could be that your restrictor pill is either missing or wrongly positioned but that would depend on what solenoid you have, feel free to post up pics if you can of turbo pipework and solenoid etc.

Cheers Iain

 

some sound advice there, on the off chance is the cel light on (limp mode)

 

Cheers mate great advise I will give it ago tomorrow :-) I think it's a 2 port solenoid as I can discribe it has joining pipes and electrics on top with to pipes coming out of the bottom one of with is going to the actuator and the other I've noticed has been blanked of looks like it was connected to something aftermarket but not shore what this pipe was going to or where it should go to or if it's normal to be blanked of ?

Thanks Colin

 

Sel light ? No lights I can c ?

 

On my Wrx I run td05 and z4 i was getting 0.7/8 bar where have u connected your boost gauge pipe too?

 

theres the problem iirc the blanked off one should be going to the inlet mani

 

I've connected the boost gauge to the 3 one one the right as your looking over it ?

So your saying the very bottom pipe coming out of the solenoid should go to the inlet and not bunged of !! But there's no spare ports in the inlet man to reconnect it ?

U must be righ somewhere along those lines cause y would it be blocked of ?

 

Have a look at this pic.

 

if its a 2 port then both pipes are needed for sure, the three port can vent the bottom pipe to atmophere and usually get away with it,.

 

Iirc the top one comes from the turbo compressor then to the top of the bs then the bottom hose to the actuator

 

That pic dosnt look much like mine as the pipes are under the resonator box

If the one goes to the actuator the other goes wear if there's no places I can see to reconnect it ?

 

Ok it may be a 3 port you have, top pipe goes to the turbo outlet, the next one down goes to the actuator and the bottom one would go to the side of your res box, the nipple on the res box that it attaches to is prone to getting snapped off, if it is indeed a 3 port that you have, be wary of just unblocking the blocked port, the pipe that would have gone from the bottom port to the res box should have a restrictor pill fitted and this is important as the restrictor has a direct effect on how much boost is produced, if the lower port is just vented to atmosphere you could risk overboost issues.

Cheers Iain

 

That makes Sense I guess thanks mate so u think I should just leave that as is then
What about the lack of boost just do what u said about cleaning it ?

Thanks colin

 

Well cleaning it would not hurt it mate but i dont think it is your issue, if it is a 3 port i would defo look into unblocking your lower port but just be aware that you need to fit a restrictor pill in there. If you started with a 1.0mm restrictor and see what you got from that then aim to get 0.8/0.9 bar max, by opening the port out by 0.1mm at a time (small drill sets available at maplin stores) I would certainly not run beyond 1.0 bar without mapping to avoid engine damage.

Cheers Iain

 

the guy has 2 pipes on his BS, one is connected and the other is blocked, this is why he is running 0.5bar , if what he is saying is right that is.

 

Take a pic of your boost solenoid and post it up.

 

It may well be a two port and with the vent port blocked it would defo give the same fault but without a pic we wont know. Pipes and electrical connections were mentioned on top of the solenoid plus two ports on the bottom, one is blocked and one goes to the actuator, now on a 2 port that pipe would go to the t piece connector between the turbo and actuator, but it was mentioned that the pipe from the solenoid goes straight to the actuator? I was just assuming that it could be a 3 port thats all.

Cheers Iain

 

Are take a pic tomorrow guys and put it up thanks for your help

 

Can't seem to be able To up load pics from my phone :-( but I do c where the pipe should be connected to so I'm going to refit it today

 

If you have an iPhone use the photobucket app to upload pictures.

 

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As u can see the bottom hose was blocked of by some one and where it went into the
Resernator box was just siliconed up what I've done is removed the bung and god took it out and she's much quicker and now boosts to 0.9 bar of boost so happy with the result it's just y would someone do that in the first place ?

Thanks guys for your help

Colin

 

Yeah thats a 3 port solenoid mate, the blocked bottom port is defo why you are running on wastegate pressure, 0.5 bar. Check the bottom pipe off the solenoid has a restrictor pill fitted you should be able to feel it squeezing the pipe if in doubt take the pipe off and have a look through it. If the restrictor is fitted, unblock the bottom pipe and take it for a run through 3rd and 4th gears from about 2500rpm, be mindful of your boost readings though, if it runs at 0.8/0.9 bar then happy days leave it alone but certainly dont run it with more than 1 bar to be safe.

Cheers Iain

 

Nice one fella, i posted up a reply earlier prior to this post, but it seems that you have it all in hand.

Cheers Iain

 

Cheers big D is all good car feels more responsive and a lot quicker now like a new car lol but I did give it a little bit in 1 gear and it did over boost abit
But all other gears is good and holds the boost at 0.9 right though the range
Happy days

 

Makes sense. As the blocked bottom port wouldn't allow the bled-off air to escape, thus keeping the boost pressure in the system up to the w/g act. - hence cracking open at its raw spring pressure of 0.5bar.

But now you have correctly unplugged it, the air escapes thus allowing boost to build before the w/g cracks open. And 0.9bar is spot on, running the Z4. Sorted.

 

ahhh 2 port
ignore me fella glad its sorted