hey guys, i just got my FC few weeks ago and i'm trying to boost it up but it just won't. when I bought it was siiting on 6psi, I tried boosting using a manual boost controller but it went down to 5psi. I got it full serviced today and now it's sitting on 3psi. I asked the mechanic and he told me probably something to do with the exhaust. But i think it's not that, co'z the engine and turbo are rebuilded start of this year. I changed the hoses to silicon but it's still the same. Im just new to rotary so plz someone help me.

 

where is the wastegate vaccum line hooked to? IS IT WORKING (wastegate)?

 

Get rid of the cats and the turbo will boost more do to less restriction. Its helps to have an FCD as well. Carefull with the boost controller you could pop your motor without extra fuel and a ported wastegate.

 

whoever mentioned the exhaust to you is probably right.

the biggest limiting factor to the boost pressure on these cars is the exhaust. if its actually malfunctioning (like a clogged cat) then your pressure will suffer even more.

 

+1 DON'T Boost over stock unless you have the supporting fuel mods AND a ported wastegate. Ask me how my apex seal found its way out my muffler if you don't believe me.

 

first thing you need to do is take the boost controller off and see what it does. It should be 6psi or so if you run a hose directly from the compressor to the wastegate.

 

do you have the boost controller lines routed correctly? as in one line from the compressor to the boost solenoid and out to the wastegate nipple?

but yeah, route the hose from the compressor to the wastegate again and check your boost

 

what if it doesn't go back to 6psi? I went for a drive today and i heard some ssssshhhhh noise like air leaking around where the turbo side is when i turned it off. So i'm suspecting maybe some hose problems. I went to a shop aswell and told me maybe the connection between the turbo and throttle body. What do you think about that. thanks

 

the owner told me when i bought that it has a high flowed cat. does that make any difference? thanks

 

i just wana say thanks to everyone who replied, i appreciate it.

 

the turbo doesnt mount onto the throttle body. maybe you blew out the turbo inlet gasket (aka turbo to manifold gasket) or the manifold to block gasket. i replaced my destroyed turbo inlet gasket and all exhaust leak sounds were gone and it started boosting normally

 

Your wastegate diaphragm could be stuck, leaving your wastegate open. Is the rod going from the wastegate to the diaphragm loose?

 

he may be right. if it's stuck open, then a lot of the exhaust gases will just bypass the turbine wheel and it'll feel like a 2 stroke motor trying to build boost on a borg warner turbine

 

try Turbo Gasket. mine was hittine LOW boost to fixed the gasket and it was fine.

 

If you were messing with a boost controller and the boost went DOWN, there's a good chance the turbo is dead...


-Ted

 

with the boost controller - 3psi
without the boost controller - 2psi

the engine and turbo was rebuild start of this year. the owner was an old guy so i don't think he have been pushing it hard. hopefully i'll get this thing figure out co'z i'm getting unpatient, i wana feel the power!

 

Oh, I thought you said it hit 6psi without the boost controller and 5psi with it.
Mah bad...


-Ted

 

Ding ding

 

6psi and 5psi both with boost controller.
everytime i try to boost it, it keeps going down.
i got full serviced and it went down to 3psi.
i took the boost controller and it went down to 2psi.

 

id still like to know where your wastegate is hooked to (vaccum line) and its not leaking or your gate even works...have you confirmed both?

 

route the wastegate vacuum line back to the compressor housing. if that doesnt work, check to make sure your wastegate is working properly..ie: not stuck open.

 

I took the hose out between the turbo and the wastegate, isn't meant to boost hardcore!? Well my car didn't and stayed low boost. The car is not blowing smoke, so I guess my turbo is still alive. So probably something is wrong with my wastegate. Am I right? what do you think guys? Thanks

 

Make sure that the wastegate rod will move freely. It sounds like your wastegate is just staying open or opening way to early.

 

What can I do about it? Is it possible for me to do it by myself or do I really need to bring to the mechanics?

 

Get an air pump and supply pressure to the nipple on the wastegate actuator. You should be able to hear it opening at 6psi. This is a lot easier to do with the turbo off the car.

But the first thing I would do is check for boost leaks. I bet you have a big one. Use a boost leak tester such as this (universal tester at bottom) www.boostpro.net/prodtester.html or fabricate your own.